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1/*!
2 * Chart.js v2.7.3
3 * https://www.chartjs.org
4 * (c) 2019 Chart.js Contributors
5 * Released under the MIT License
6 * THIS VERSION IS THE MINIMAL VERSION: MOMENT JS ISN'T INCLUDED HERE, SEE BUNDLED VERSION INSTEAD I PUBLISHED BEFORE THIS DATE
7 */
8(function (global, factory) {
9typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('moment')) :
10typeof define === 'function' && define.amd ? define(['moment'], factory) :
11(global.Chart = factory(global.moment));
12}(this, (function (moment) { 'use strict';
13
14moment = moment && moment.hasOwnProperty('default') ? moment['default'] : moment;
15
16/* MIT license */
17
18var conversions = {
19  rgb2hsl: rgb2hsl,
20  rgb2hsv: rgb2hsv,
21  rgb2hwb: rgb2hwb,
22  rgb2cmyk: rgb2cmyk,
23  rgb2keyword: rgb2keyword,
24  rgb2xyz: rgb2xyz,
25  rgb2lab: rgb2lab,
26  rgb2lch: rgb2lch,
27
28  hsl2rgb: hsl2rgb,
29  hsl2hsv: hsl2hsv,
30  hsl2hwb: hsl2hwb,
31  hsl2cmyk: hsl2cmyk,
32  hsl2keyword: hsl2keyword,
33
34  hsv2rgb: hsv2rgb,
35  hsv2hsl: hsv2hsl,
36  hsv2hwb: hsv2hwb,
37  hsv2cmyk: hsv2cmyk,
38  hsv2keyword: hsv2keyword,
39
40  hwb2rgb: hwb2rgb,
41  hwb2hsl: hwb2hsl,
42  hwb2hsv: hwb2hsv,
43  hwb2cmyk: hwb2cmyk,
44  hwb2keyword: hwb2keyword,
45
46  cmyk2rgb: cmyk2rgb,
47  cmyk2hsl: cmyk2hsl,
48  cmyk2hsv: cmyk2hsv,
49  cmyk2hwb: cmyk2hwb,
50  cmyk2keyword: cmyk2keyword,
51
52  keyword2rgb: keyword2rgb,
53  keyword2hsl: keyword2hsl,
54  keyword2hsv: keyword2hsv,
55  keyword2hwb: keyword2hwb,
56  keyword2cmyk: keyword2cmyk,
57  keyword2lab: keyword2lab,
58  keyword2xyz: keyword2xyz,
59
60  xyz2rgb: xyz2rgb,
61  xyz2lab: xyz2lab,
62  xyz2lch: xyz2lch,
63
64  lab2xyz: lab2xyz,
65  lab2rgb: lab2rgb,
66  lab2lch: lab2lch,
67
68  lch2lab: lch2lab,
69  lch2xyz: lch2xyz,
70  lch2rgb: lch2rgb
71};
72
73
74function rgb2hsl(rgb) {
75  var r = rgb[0]/255,
76      g = rgb[1]/255,
77      b = rgb[2]/255,
78      min = Math.min(r, g, b),
79      max = Math.max(r, g, b),
80      delta = max - min,
81      h, s, l;
82
83  if (max == min)
84    h = 0;
85  else if (r == max)
86    h = (g - b) / delta;
87  else if (g == max)
88    h = 2 + (b - r) / delta;
89  else if (b == max)
90    h = 4 + (r - g)/ delta;
91
92  h = Math.min(h * 60, 360);
93
94  if (h < 0)
95    h += 360;
96
97  l = (min + max) / 2;
98
99  if (max == min)
100    s = 0;
101  else if (l <= 0.5)
102    s = delta / (max + min);
103  else
104    s = delta / (2 - max - min);
105
106  return [h, s * 100, l * 100];
107}
108
109function rgb2hsv(rgb) {
110  var r = rgb[0],
111      g = rgb[1],
112      b = rgb[2],
113      min = Math.min(r, g, b),
114      max = Math.max(r, g, b),
115      delta = max - min,
116      h, s, v;
117
118  if (max == 0)
119    s = 0;
120  else
121    s = (delta/max * 1000)/10;
122
123  if (max == min)
124    h = 0;
125  else if (r == max)
126    h = (g - b) / delta;
127  else if (g == max)
128    h = 2 + (b - r) / delta;
129  else if (b == max)
130    h = 4 + (r - g) / delta;
131
132  h = Math.min(h * 60, 360);
133
134  if (h < 0)
135    h += 360;
136
137  v = ((max / 255) * 1000) / 10;
138
139  return [h, s, v];
140}
141
142function rgb2hwb(rgb) {
143  var r = rgb[0],
144      g = rgb[1],
145      b = rgb[2],
146      h = rgb2hsl(rgb)[0],
147      w = 1/255 * Math.min(r, Math.min(g, b)),
148      b = 1 - 1/255 * Math.max(r, Math.max(g, b));
149
150  return [h, w * 100, b * 100];
151}
152
153function rgb2cmyk(rgb) {
154  var r = rgb[0] / 255,
155      g = rgb[1] / 255,
156      b = rgb[2] / 255,
157      c, m, y, k;
158
159  k = Math.min(1 - r, 1 - g, 1 - b);
160  c = (1 - r - k) / (1 - k) || 0;
161  m = (1 - g - k) / (1 - k) || 0;
162  y = (1 - b - k) / (1 - k) || 0;
163  return [c * 100, m * 100, y * 100, k * 100];
164}
165
166function rgb2keyword(rgb) {
167  return reverseKeywords[JSON.stringify(rgb)];
168}
169
170function rgb2xyz(rgb) {
171  var r = rgb[0] / 255,
172      g = rgb[1] / 255,
173      b = rgb[2] / 255;
174
175  // assume sRGB
176  r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92);
177  g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92);
178  b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92);
179
180  var x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
181  var y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
182  var z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);
183
184  return [x * 100, y *100, z * 100];
185}
186
187function rgb2lab(rgb) {
188  var xyz = rgb2xyz(rgb),
189        x = xyz[0],
190        y = xyz[1],
191        z = xyz[2],
192        l, a, b;
193
194  x /= 95.047;
195  y /= 100;
196  z /= 108.883;
197
198  x = x > 0.008856 ? Math.pow(x, 1/3) : (7.787 * x) + (16 / 116);
199  y = y > 0.008856 ? Math.pow(y, 1/3) : (7.787 * y) + (16 / 116);
200  z = z > 0.008856 ? Math.pow(z, 1/3) : (7.787 * z) + (16 / 116);
201
202  l = (116 * y) - 16;
203  a = 500 * (x - y);
204  b = 200 * (y - z);
205
206  return [l, a, b];
207}
208
209function rgb2lch(args) {
210  return lab2lch(rgb2lab(args));
211}
212
213function hsl2rgb(hsl) {
214  var h = hsl[0] / 360,
215      s = hsl[1] / 100,
216      l = hsl[2] / 100,
217      t1, t2, t3, rgb, val;
218
219  if (s == 0) {
220    val = l * 255;
221    return [val, val, val];
222  }
223
224  if (l < 0.5)
225    t2 = l * (1 + s);
226  else
227    t2 = l + s - l * s;
228  t1 = 2 * l - t2;
229
230  rgb = [0, 0, 0];
231  for (var i = 0; i < 3; i++) {
232    t3 = h + 1 / 3 * - (i - 1);
233    t3 < 0 && t3++;
234    t3 > 1 && t3--;
235
236    if (6 * t3 < 1)
237      val = t1 + (t2 - t1) * 6 * t3;
238    else if (2 * t3 < 1)
239      val = t2;
240    else if (3 * t3 < 2)
241      val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
242    else
243      val = t1;
244
245    rgb[i] = val * 255;
246  }
247
248  return rgb;
249}
250
251function hsl2hsv(hsl) {
252  var h = hsl[0],
253      s = hsl[1] / 100,
254      l = hsl[2] / 100,
255      sv, v;
256
257  if(l === 0) {
258      // no need to do calc on black
259      // also avoids divide by 0 error
260      return [0, 0, 0];
261  }
262
263  l *= 2;
264  s *= (l <= 1) ? l : 2 - l;
265  v = (l + s) / 2;
266  sv = (2 * s) / (l + s);
267  return [h, sv * 100, v * 100];
268}
269
270function hsl2hwb(args) {
271  return rgb2hwb(hsl2rgb(args));
272}
273
274function hsl2cmyk(args) {
275  return rgb2cmyk(hsl2rgb(args));
276}
277
278function hsl2keyword(args) {
279  return rgb2keyword(hsl2rgb(args));
280}
281
282
283function hsv2rgb(hsv) {
284  var h = hsv[0] / 60,
285      s = hsv[1] / 100,
286      v = hsv[2] / 100,
287      hi = Math.floor(h) % 6;
288
289  var f = h - Math.floor(h),
290      p = 255 * v * (1 - s),
291      q = 255 * v * (1 - (s * f)),
292      t = 255 * v * (1 - (s * (1 - f))),
293      v = 255 * v;
294
295  switch(hi) {
296    case 0:
297      return [v, t, p];
298    case 1:
299      return [q, v, p];
300    case 2:
301      return [p, v, t];
302    case 3:
303      return [p, q, v];
304    case 4:
305      return [t, p, v];
306    case 5:
307      return [v, p, q];
308  }
309}
310
311function hsv2hsl(hsv) {
312  var h = hsv[0],
313      s = hsv[1] / 100,
314      v = hsv[2] / 100,
315      sl, l;
316
317  l = (2 - s) * v;
318  sl = s * v;
319  sl /= (l <= 1) ? l : 2 - l;
320  sl = sl || 0;
321  l /= 2;
322  return [h, sl * 100, l * 100];
323}
324
325function hsv2hwb(args) {
326  return rgb2hwb(hsv2rgb(args))
327}
328
329function hsv2cmyk(args) {
330  return rgb2cmyk(hsv2rgb(args));
331}
332
333function hsv2keyword(args) {
334  return rgb2keyword(hsv2rgb(args));
335}
336
337// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
338function hwb2rgb(hwb) {
339  var h = hwb[0] / 360,
340      wh = hwb[1] / 100,
341      bl = hwb[2] / 100,
342      ratio = wh + bl,
343      i, v, f, n;
344
345  // wh + bl cant be > 1
346  if (ratio > 1) {
347    wh /= ratio;
348    bl /= ratio;
349  }
350
351  i = Math.floor(6 * h);
352  v = 1 - bl;
353  f = 6 * h - i;
354  if ((i & 0x01) != 0) {
355    f = 1 - f;
356  }
357  n = wh + f * (v - wh);  // linear interpolation
358
359  switch (i) {
360    default:
361    case 6:
362    case 0: r = v; g = n; b = wh; break;
363    case 1: r = n; g = v; b = wh; break;
364    case 2: r = wh; g = v; b = n; break;
365    case 3: r = wh; g = n; b = v; break;
366    case 4: r = n; g = wh; b = v; break;
367    case 5: r = v; g = wh; b = n; break;
368  }
369
370  return [r * 255, g * 255, b * 255];
371}
372
373function hwb2hsl(args) {
374  return rgb2hsl(hwb2rgb(args));
375}
376
377function hwb2hsv(args) {
378  return rgb2hsv(hwb2rgb(args));
379}
380
381function hwb2cmyk(args) {
382  return rgb2cmyk(hwb2rgb(args));
383}
384
385function hwb2keyword(args) {
386  return rgb2keyword(hwb2rgb(args));
387}
388
389function cmyk2rgb(cmyk) {
390  var c = cmyk[0] / 100,
391      m = cmyk[1] / 100,
392      y = cmyk[2] / 100,
393      k = cmyk[3] / 100,
394      r, g, b;
395
396  r = 1 - Math.min(1, c * (1 - k) + k);
397  g = 1 - Math.min(1, m * (1 - k) + k);
398  b = 1 - Math.min(1, y * (1 - k) + k);
399  return [r * 255, g * 255, b * 255];
400}
401
402function cmyk2hsl(args) {
403  return rgb2hsl(cmyk2rgb(args));
404}
405
406function cmyk2hsv(args) {
407  return rgb2hsv(cmyk2rgb(args));
408}
409
410function cmyk2hwb(args) {
411  return rgb2hwb(cmyk2rgb(args));
412}
413
414function cmyk2keyword(args) {
415  return rgb2keyword(cmyk2rgb(args));
416}
417
418
419function xyz2rgb(xyz) {
420  var x = xyz[0] / 100,
421      y = xyz[1] / 100,
422      z = xyz[2] / 100,
423      r, g, b;
424
425  r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
426  g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
427  b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);
428
429  // assume sRGB
430  r = r > 0.0031308 ? ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055)
431    : r = (r * 12.92);
432
433  g = g > 0.0031308 ? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055)
434    : g = (g * 12.92);
435
436  b = b > 0.0031308 ? ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055)
437    : b = (b * 12.92);
438
439  r = Math.min(Math.max(0, r), 1);
440  g = Math.min(Math.max(0, g), 1);
441  b = Math.min(Math.max(0, b), 1);
442
443  return [r * 255, g * 255, b * 255];
444}
445
446function xyz2lab(xyz) {
447  var x = xyz[0],
448      y = xyz[1],
449      z = xyz[2],
450      l, a, b;
451
452  x /= 95.047;
453  y /= 100;
454  z /= 108.883;
455
456  x = x > 0.008856 ? Math.pow(x, 1/3) : (7.787 * x) + (16 / 116);
457  y = y > 0.008856 ? Math.pow(y, 1/3) : (7.787 * y) + (16 / 116);
458  z = z > 0.008856 ? Math.pow(z, 1/3) : (7.787 * z) + (16 / 116);
459
460  l = (116 * y) - 16;
461  a = 500 * (x - y);
462  b = 200 * (y - z);
463
464  return [l, a, b];
465}
466
467function xyz2lch(args) {
468  return lab2lch(xyz2lab(args));
469}
470
471function lab2xyz(lab) {
472  var l = lab[0],
473      a = lab[1],
474      b = lab[2],
475      x, y, z, y2;
476
477  if (l <= 8) {
478    y = (l * 100) / 903.3;
479    y2 = (7.787 * (y / 100)) + (16 / 116);
480  } else {
481    y = 100 * Math.pow((l + 16) / 116, 3);
482    y2 = Math.pow(y / 100, 1/3);
483  }
484
485  x = x / 95.047 <= 0.008856 ? x = (95.047 * ((a / 500) + y2 - (16 / 116))) / 7.787 : 95.047 * Math.pow((a / 500) + y2, 3);
486
487  z = z / 108.883 <= 0.008859 ? z = (108.883 * (y2 - (b / 200) - (16 / 116))) / 7.787 : 108.883 * Math.pow(y2 - (b / 200), 3);
488
489  return [x, y, z];
490}
491
492function lab2lch(lab) {
493  var l = lab[0],
494      a = lab[1],
495      b = lab[2],
496      hr, h, c;
497
498  hr = Math.atan2(b, a);
499  h = hr * 360 / 2 / Math.PI;
500  if (h < 0) {
501    h += 360;
502  }
503  c = Math.sqrt(a * a + b * b);
504  return [l, c, h];
505}
506
507function lab2rgb(args) {
508  return xyz2rgb(lab2xyz(args));
509}
510
511function lch2lab(lch) {
512  var l = lch[0],
513      c = lch[1],
514      h = lch[2],
515      a, b, hr;
516
517  hr = h / 360 * 2 * Math.PI;
518  a = c * Math.cos(hr);
519  b = c * Math.sin(hr);
520  return [l, a, b];
521}
522
523function lch2xyz(args) {
524  return lab2xyz(lch2lab(args));
525}
526
527function lch2rgb(args) {
528  return lab2rgb(lch2lab(args));
529}
530
531function keyword2rgb(keyword) {
532  return cssKeywords[keyword];
533}
534
535function keyword2hsl(args) {
536  return rgb2hsl(keyword2rgb(args));
537}
538
539function keyword2hsv(args) {
540  return rgb2hsv(keyword2rgb(args));
541}
542
543function keyword2hwb(args) {
544  return rgb2hwb(keyword2rgb(args));
545}
546
547function keyword2cmyk(args) {
548  return rgb2cmyk(keyword2rgb(args));
549}
550
551function keyword2lab(args) {
552  return rgb2lab(keyword2rgb(args));
553}
554
555function keyword2xyz(args) {
556  return rgb2xyz(keyword2rgb(args));
557}
558
559var cssKeywords = {
560  aliceblue:  [240,248,255],
561  antiquewhite: [250,235,215],
562  aqua: [0,255,255],
563  aquamarine: [127,255,212],
564  azure:  [240,255,255],
565  beige:  [245,245,220],
566  bisque: [255,228,196],
567  black:  [0,0,0],
568  blanchedalmond: [255,235,205],
569  blue: [0,0,255],
570  blueviolet: [138,43,226],
571  brown:  [165,42,42],
572  burlywood:  [222,184,135],
573  cadetblue:  [95,158,160],
574  chartreuse: [127,255,0],
575  chocolate:  [210,105,30],
576  coral:  [255,127,80],
577  cornflowerblue: [100,149,237],
578  cornsilk: [255,248,220],
579  crimson:  [220,20,60],
580  cyan: [0,255,255],
581  darkblue: [0,0,139],
582  darkcyan: [0,139,139],
583  darkgoldenrod:  [184,134,11],
584  darkgray: [169,169,169],
585  darkgreen:  [0,100,0],
586  darkgrey: [169,169,169],
587  darkkhaki:  [189,183,107],
588  darkmagenta:  [139,0,139],
589  darkolivegreen: [85,107,47],
590  darkorange: [255,140,0],
591  darkorchid: [153,50,204],
592  darkred:  [139,0,0],
593  darksalmon: [233,150,122],
594  darkseagreen: [143,188,143],
595  darkslateblue:  [72,61,139],
596  darkslategray:  [47,79,79],
597  darkslategrey:  [47,79,79],
598  darkturquoise:  [0,206,209],
599  darkviolet: [148,0,211],
600  deeppink: [255,20,147],
601  deepskyblue:  [0,191,255],
602  dimgray:  [105,105,105],
603  dimgrey:  [105,105,105],
604  dodgerblue: [30,144,255],
605  firebrick:  [178,34,34],
606  floralwhite:  [255,250,240],
607  forestgreen:  [34,139,34],
608  fuchsia:  [255,0,255],
609  gainsboro:  [220,220,220],
610  ghostwhite: [248,248,255],
611  gold: [255,215,0],
612  goldenrod:  [218,165,32],
613  gray: [128,128,128],
614  green:  [0,128,0],
615  greenyellow:  [173,255,47],
616  grey: [128,128,128],
617  honeydew: [240,255,240],
618  hotpink:  [255,105,180],
619  indianred:  [205,92,92],
620  indigo: [75,0,130],
621  ivory:  [255,255,240],
622  khaki:  [240,230,140],
623  lavender: [230,230,250],
624  lavenderblush:  [255,240,245],
625  lawngreen:  [124,252,0],
626  lemonchiffon: [255,250,205],
627  lightblue:  [173,216,230],
628  lightcoral: [240,128,128],
629  lightcyan:  [224,255,255],
630  lightgoldenrodyellow: [250,250,210],
631  lightgray:  [211,211,211],
632  lightgreen: [144,238,144],
633  lightgrey:  [211,211,211],
634  lightpink:  [255,182,193],
635  lightsalmon:  [255,160,122],
636  lightseagreen:  [32,178,170],
637  lightskyblue: [135,206,250],
638  lightslategray: [119,136,153],
639  lightslategrey: [119,136,153],
640  lightsteelblue: [176,196,222],
641  lightyellow:  [255,255,224],
642  lime: [0,255,0],
643  limegreen:  [50,205,50],
644  linen:  [250,240,230],
645  magenta:  [255,0,255],
646  maroon: [128,0,0],
647  mediumaquamarine: [102,205,170],
648  mediumblue: [0,0,205],
649  mediumorchid: [186,85,211],
650  mediumpurple: [147,112,219],
651  mediumseagreen: [60,179,113],
652  mediumslateblue:  [123,104,238],
653  mediumspringgreen:  [0,250,154],
654  mediumturquoise:  [72,209,204],
655  mediumvioletred:  [199,21,133],
656  midnightblue: [25,25,112],
657  mintcream:  [245,255,250],
658  mistyrose:  [255,228,225],
659  moccasin: [255,228,181],
660  navajowhite:  [255,222,173],
661  navy: [0,0,128],
662  oldlace:  [253,245,230],
663  olive:  [128,128,0],
664  olivedrab:  [107,142,35],
665  orange: [255,165,0],
666  orangered:  [255,69,0],
667  orchid: [218,112,214],
668  palegoldenrod:  [238,232,170],
669  palegreen:  [152,251,152],
670  paleturquoise:  [175,238,238],
671  palevioletred:  [219,112,147],
672  papayawhip: [255,239,213],
673  peachpuff:  [255,218,185],
674  peru: [205,133,63],
675  pink: [255,192,203],
676  plum: [221,160,221],
677  powderblue: [176,224,230],
678  purple: [128,0,128],
679  rebeccapurple: [102, 51, 153],
680  red:  [255,0,0],
681  rosybrown:  [188,143,143],
682  royalblue:  [65,105,225],
683  saddlebrown:  [139,69,19],
684  salmon: [250,128,114],
685  sandybrown: [244,164,96],
686  seagreen: [46,139,87],
687  seashell: [255,245,238],
688  sienna: [160,82,45],
689  silver: [192,192,192],
690  skyblue:  [135,206,235],
691  slateblue:  [106,90,205],
692  slategray:  [112,128,144],
693  slategrey:  [112,128,144],
694  snow: [255,250,250],
695  springgreen:  [0,255,127],
696  steelblue:  [70,130,180],
697  tan:  [210,180,140],
698  teal: [0,128,128],
699  thistle:  [216,191,216],
700  tomato: [255,99,71],
701  turquoise:  [64,224,208],
702  violet: [238,130,238],
703  wheat:  [245,222,179],
704  white:  [255,255,255],
705  whitesmoke: [245,245,245],
706  yellow: [255,255,0],
707  yellowgreen:  [154,205,50]
708};
709
710var reverseKeywords = {};
711for (var key in cssKeywords) {
712  reverseKeywords[JSON.stringify(cssKeywords[key])] = key;
713}
714
715var convert = function() {
716   return new Converter();
717};
718
719for (var func in conversions) {
720  // export Raw versions
721  convert[func + "Raw"] =  (function(func) {
722    // accept array or plain args
723    return function(arg) {
724      if (typeof arg == "number")
725        arg = Array.prototype.slice.call(arguments);
726      return conversions[func](arg);
727    }
728  })(func);
729
730  var pair = /(\w+)2(\w+)/.exec(func),
731      from = pair[1],
732      to = pair[2];
733
734  // export rgb2hsl and ["rgb"]["hsl"]
735  convert[from] = convert[from] || {};
736
737  convert[from][to] = convert[func] = (function(func) { 
738    return function(arg) {
739      if (typeof arg == "number")
740        arg = Array.prototype.slice.call(arguments);
741      
742      var val = conversions[func](arg);
743      if (typeof val == "string" || val === undefined)
744        return val; // keyword
745
746      for (var i = 0; i < val.length; i++)
747        val[i] = Math.round(val[i]);
748      return val;
749    }
750  })(func);
751}
752
753
754/* Converter does lazy conversion and caching */
755var Converter = function() {
756   this.convs = {};
757};
758
759/* Either get the values for a space or
760  set the values for a space, depending on args */
761Converter.prototype.routeSpace = function(space, args) {
762   var values = args[0];
763   if (values === undefined) {
764      // color.rgb()
765      return this.getValues(space);
766   }
767   // color.rgb(10, 10, 10)
768   if (typeof values == "number") {
769      values = Array.prototype.slice.call(args);        
770   }
771
772   return this.setValues(space, values);
773};
774  
775/* Set the values for a space, invalidating cache */
776Converter.prototype.setValues = function(space, values) {
777   this.space = space;
778   this.convs = {};
779   this.convs[space] = values;
780   return this;
781};
782
783/* Get the values for a space. If there's already
784  a conversion for the space, fetch it, otherwise
785  compute it */
786Converter.prototype.getValues = function(space) {
787   var vals = this.convs[space];
788   if (!vals) {
789      var fspace = this.space,
790          from = this.convs[fspace];
791      vals = convert[fspace][space](from);
792
793      this.convs[space] = vals;
794   }
795  return vals;
796};
797
798["rgb", "hsl", "hsv", "cmyk", "keyword"].forEach(function(space) {
799   Converter.prototype[space] = function(vals) {
800      return this.routeSpace(space, arguments);
801   };
802});
803
804var colorConvert = convert;
805
806var colorName = {
807	"aliceblue": [240, 248, 255],
808	"antiquewhite": [250, 235, 215],
809	"aqua": [0, 255, 255],
810	"aquamarine": [127, 255, 212],
811	"azure": [240, 255, 255],
812	"beige": [245, 245, 220],
813	"bisque": [255, 228, 196],
814	"black": [0, 0, 0],
815	"blanchedalmond": [255, 235, 205],
816	"blue": [0, 0, 255],
817	"blueviolet": [138, 43, 226],
818	"brown": [165, 42, 42],
819	"burlywood": [222, 184, 135],
820	"cadetblue": [95, 158, 160],
821	"chartreuse": [127, 255, 0],
822	"chocolate": [210, 105, 30],
823	"coral": [255, 127, 80],
824	"cornflowerblue": [100, 149, 237],
825	"cornsilk": [255, 248, 220],
826	"crimson": [220, 20, 60],
827	"cyan": [0, 255, 255],
828	"darkblue": [0, 0, 139],
829	"darkcyan": [0, 139, 139],
830	"darkgoldenrod": [184, 134, 11],
831	"darkgray": [169, 169, 169],
832	"darkgreen": [0, 100, 0],
833	"darkgrey": [169, 169, 169],
834	"darkkhaki": [189, 183, 107],
835	"darkmagenta": [139, 0, 139],
836	"darkolivegreen": [85, 107, 47],
837	"darkorange": [255, 140, 0],
838	"darkorchid": [153, 50, 204],
839	"darkred": [139, 0, 0],
840	"darksalmon": [233, 150, 122],
841	"darkseagreen": [143, 188, 143],
842	"darkslateblue": [72, 61, 139],
843	"darkslategray": [47, 79, 79],
844	"darkslategrey": [47, 79, 79],
845	"darkturquoise": [0, 206, 209],
846	"darkviolet": [148, 0, 211],
847	"deeppink": [255, 20, 147],
848	"deepskyblue": [0, 191, 255],
849	"dimgray": [105, 105, 105],
850	"dimgrey": [105, 105, 105],
851	"dodgerblue": [30, 144, 255],
852	"firebrick": [178, 34, 34],
853	"floralwhite": [255, 250, 240],
854	"forestgreen": [34, 139, 34],
855	"fuchsia": [255, 0, 255],
856	"gainsboro": [220, 220, 220],
857	"ghostwhite": [248, 248, 255],
858	"gold": [255, 215, 0],
859	"goldenrod": [218, 165, 32],
860	"gray": [128, 128, 128],
861	"green": [0, 128, 0],
862	"greenyellow": [173, 255, 47],
863	"grey": [128, 128, 128],
864	"honeydew": [240, 255, 240],
865	"hotpink": [255, 105, 180],
866	"indianred": [205, 92, 92],
867	"indigo": [75, 0, 130],
868	"ivory": [255, 255, 240],
869	"khaki": [240, 230, 140],
870	"lavender": [230, 230, 250],
871	"lavenderblush": [255, 240, 245],
872	"lawngreen": [124, 252, 0],
873	"lemonchiffon": [255, 250, 205],
874	"lightblue": [173, 216, 230],
875	"lightcoral": [240, 128, 128],
876	"lightcyan": [224, 255, 255],
877	"lightgoldenrodyellow": [250, 250, 210],
878	"lightgray": [211, 211, 211],
879	"lightgreen": [144, 238, 144],
880	"lightgrey": [211, 211, 211],
881	"lightpink": [255, 182, 193],
882	"lightsalmon": [255, 160, 122],
883	"lightseagreen": [32, 178, 170],
884	"lightskyblue": [135, 206, 250],
885	"lightslategray": [119, 136, 153],
886	"lightslategrey": [119, 136, 153],
887	"lightsteelblue": [176, 196, 222],
888	"lightyellow": [255, 255, 224],
889	"lime": [0, 255, 0],
890	"limegreen": [50, 205, 50],
891	"linen": [250, 240, 230],
892	"magenta": [255, 0, 255],
893	"maroon": [128, 0, 0],
894	"mediumaquamarine": [102, 205, 170],
895	"mediumblue": [0, 0, 205],
896	"mediumorchid": [186, 85, 211],
897	"mediumpurple": [147, 112, 219],
898	"mediumseagreen": [60, 179, 113],
899	"mediumslateblue": [123, 104, 238],
900	"mediumspringgreen": [0, 250, 154],
901	"mediumturquoise": [72, 209, 204],
902	"mediumvioletred": [199, 21, 133],
903	"midnightblue": [25, 25, 112],
904	"mintcream": [245, 255, 250],
905	"mistyrose": [255, 228, 225],
906	"moccasin": [255, 228, 181],
907	"navajowhite": [255, 222, 173],
908	"navy": [0, 0, 128],
909	"oldlace": [253, 245, 230],
910	"olive": [128, 128, 0],
911	"olivedrab": [107, 142, 35],
912	"orange": [255, 165, 0],
913	"orangered": [255, 69, 0],
914	"orchid": [218, 112, 214],
915	"palegoldenrod": [238, 232, 170],
916	"palegreen": [152, 251, 152],
917	"paleturquoise": [175, 238, 238],
918	"palevioletred": [219, 112, 147],
919	"papayawhip": [255, 239, 213],
920	"peachpuff": [255, 218, 185],
921	"peru": [205, 133, 63],
922	"pink": [255, 192, 203],
923	"plum": [221, 160, 221],
924	"powderblue": [176, 224, 230],
925	"purple": [128, 0, 128],
926	"rebeccapurple": [102, 51, 153],
927	"red": [255, 0, 0],
928	"rosybrown": [188, 143, 143],
929	"royalblue": [65, 105, 225],
930	"saddlebrown": [139, 69, 19],
931	"salmon": [250, 128, 114],
932	"sandybrown": [244, 164, 96],
933	"seagreen": [46, 139, 87],
934	"seashell": [255, 245, 238],
935	"sienna": [160, 82, 45],
936	"silver": [192, 192, 192],
937	"skyblue": [135, 206, 235],
938	"slateblue": [106, 90, 205],
939	"slategray": [112, 128, 144],
940	"slategrey": [112, 128, 144],
941	"snow": [255, 250, 250],
942	"springgreen": [0, 255, 127],
943	"steelblue": [70, 130, 180],
944	"tan": [210, 180, 140],
945	"teal": [0, 128, 128],
946	"thistle": [216, 191, 216],
947	"tomato": [255, 99, 71],
948	"turquoise": [64, 224, 208],
949	"violet": [238, 130, 238],
950	"wheat": [245, 222, 179],
951	"white": [255, 255, 255],
952	"whitesmoke": [245, 245, 245],
953	"yellow": [255, 255, 0],
954	"yellowgreen": [154, 205, 50]
955};
956
957/* MIT license */
958
959
960var colorString = {
961   getRgba: getRgba,
962   getHsla: getHsla,
963   getRgb: getRgb,
964   getHsl: getHsl,
965   getHwb: getHwb,
966   getAlpha: getAlpha,
967
968   hexString: hexString,
969   rgbString: rgbString,
970   rgbaString: rgbaString,
971   percentString: percentString,
972   percentaString: percentaString,
973   hslString: hslString,
974   hslaString: hslaString,
975   hwbString: hwbString,
976   keyword: keyword
977};
978
979function getRgba(string) {
980   if (!string) {
981      return;
982   }
983   var abbr =  /^#([a-fA-F0-9]{3})$/i,
984       hex =  /^#([a-fA-F0-9]{6})$/i,
985       rgba = /^rgba?\(\s*([+-]?\d+)\s*,\s*([+-]?\d+)\s*,\s*([+-]?\d+)\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/i,
986       per = /^rgba?\(\s*([+-]?[\d\.]+)\%\s*,\s*([+-]?[\d\.]+)\%\s*,\s*([+-]?[\d\.]+)\%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)$/i,
987       keyword = /(\w+)/;
988
989   var rgb = [0, 0, 0],
990       a = 1,
991       match = string.match(abbr);
992   if (match) {
993      match = match[1];
994      for (var i = 0; i < rgb.length; i++) {
995         rgb[i] = parseInt(match[i] + match[i], 16);
996      }
997   }
998   else if (match = string.match(hex)) {
999      match = match[1];
1000      for (var i = 0; i < rgb.length; i++) {
1001         rgb[i] = parseInt(match.slice(i * 2, i * 2 + 2), 16);
1002      }
1003   }
1004   else if (match = string.match(rgba)) {
1005      for (var i = 0; i < rgb.length; i++) {
1006         rgb[i] = parseInt(match[i + 1]);
1007      }
1008      a = parseFloat(match[4]);
1009   }
1010   else if (match = string.match(per)) {
1011      for (var i = 0; i < rgb.length; i++) {
1012         rgb[i] = Math.round(parseFloat(match[i + 1]) * 2.55);
1013      }
1014      a = parseFloat(match[4]);
1015   }
1016   else if (match = string.match(keyword)) {
1017      if (match[1] == "transparent") {
1018         return [0, 0, 0, 0];
1019      }
1020      rgb = colorName[match[1]];
1021      if (!rgb) {
1022         return;
1023      }
1024   }
1025
1026   for (var i = 0; i < rgb.length; i++) {
1027      rgb[i] = scale(rgb[i], 0, 255);
1028   }
1029   if (!a && a != 0) {
1030      a = 1;
1031   }
1032   else {
1033      a = scale(a, 0, 1);
1034   }
1035   rgb[3] = a;
1036   return rgb;
1037}
1038
1039function getHsla(string) {
1040   if (!string) {
1041      return;
1042   }
1043   var hsl = /^hsla?\(\s*([+-]?\d+)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)/;
1044   var match = string.match(hsl);
1045   if (match) {
1046      var alpha = parseFloat(match[4]);
1047      var h = scale(parseInt(match[1]), 0, 360),
1048          s = scale(parseFloat(match[2]), 0, 100),
1049          l = scale(parseFloat(match[3]), 0, 100),
1050          a = scale(isNaN(alpha) ? 1 : alpha, 0, 1);
1051      return [h, s, l, a];
1052   }
1053}
1054
1055function getHwb(string) {
1056   if (!string) {
1057      return;
1058   }
1059   var hwb = /^hwb\(\s*([+-]?\d+)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?[\d\.]+)\s*)?\)/;
1060   var match = string.match(hwb);
1061   if (match) {
1062    var alpha = parseFloat(match[4]);
1063      var h = scale(parseInt(match[1]), 0, 360),
1064          w = scale(parseFloat(match[2]), 0, 100),
1065          b = scale(parseFloat(match[3]), 0, 100),
1066          a = scale(isNaN(alpha) ? 1 : alpha, 0, 1);
1067      return [h, w, b, a];
1068   }
1069}
1070
1071function getRgb(string) {
1072   var rgba = getRgba(string);
1073   return rgba && rgba.slice(0, 3);
1074}
1075
1076function getHsl(string) {
1077  var hsla = getHsla(string);
1078  return hsla && hsla.slice(0, 3);
1079}
1080
1081function getAlpha(string) {
1082   var vals = getRgba(string);
1083   if (vals) {
1084      return vals[3];
1085   }
1086   else if (vals = getHsla(string)) {
1087      return vals[3];
1088   }
1089   else if (vals = getHwb(string)) {
1090      return vals[3];
1091   }
1092}
1093
1094// generators
1095function hexString(rgb) {
1096   return "#" + hexDouble(rgb[0]) + hexDouble(rgb[1])
1097              + hexDouble(rgb[2]);
1098}
1099
1100function rgbString(rgba, alpha) {
1101   if (alpha < 1 || (rgba[3] && rgba[3] < 1)) {
1102      return rgbaString(rgba, alpha);
1103   }
1104   return "rgb(" + rgba[0] + ", " + rgba[1] + ", " + rgba[2] + ")";
1105}
1106
1107function rgbaString(rgba, alpha) {
1108   if (alpha === undefined) {
1109      alpha = (rgba[3] !== undefined ? rgba[3] : 1);
1110   }
1111   return "rgba(" + rgba[0] + ", " + rgba[1] + ", " + rgba[2]
1112           + ", " + alpha + ")";
1113}
1114
1115function percentString(rgba, alpha) {
1116   if (alpha < 1 || (rgba[3] && rgba[3] < 1)) {
1117      return percentaString(rgba, alpha);
1118   }
1119   var r = Math.round(rgba[0]/255 * 100),
1120       g = Math.round(rgba[1]/255 * 100),
1121       b = Math.round(rgba[2]/255 * 100);
1122
1123   return "rgb(" + r + "%, " + g + "%, " + b + "%)";
1124}
1125
1126function percentaString(rgba, alpha) {
1127   var r = Math.round(rgba[0]/255 * 100),
1128       g = Math.round(rgba[1]/255 * 100),
1129       b = Math.round(rgba[2]/255 * 100);
1130   return "rgba(" + r + "%, " + g + "%, " + b + "%, " + (alpha || rgba[3] || 1) + ")";
1131}
1132
1133function hslString(hsla, alpha) {
1134   if (alpha < 1 || (hsla[3] && hsla[3] < 1)) {
1135      return hslaString(hsla, alpha);
1136   }
1137   return "hsl(" + hsla[0] + ", " + hsla[1] + "%, " + hsla[2] + "%)";
1138}
1139
1140function hslaString(hsla, alpha) {
1141   if (alpha === undefined) {
1142      alpha = (hsla[3] !== undefined ? hsla[3] : 1);
1143   }
1144   return "hsla(" + hsla[0] + ", " + hsla[1] + "%, " + hsla[2] + "%, "
1145           + alpha + ")";
1146}
1147
1148// hwb is a bit different than rgb(a) & hsl(a) since there is no alpha specific syntax
1149// (hwb have alpha optional & 1 is default value)
1150function hwbString(hwb, alpha) {
1151   if (alpha === undefined) {
1152      alpha = (hwb[3] !== undefined ? hwb[3] : 1);
1153   }
1154   return "hwb(" + hwb[0] + ", " + hwb[1] + "%, " + hwb[2] + "%"
1155           + (alpha !== undefined && alpha !== 1 ? ", " + alpha : "") + ")";
1156}
1157
1158function keyword(rgb) {
1159  return reverseNames[rgb.slice(0, 3)];
1160}
1161
1162// helpers
1163function scale(num, min, max) {
1164   return Math.min(Math.max(min, num), max);
1165}
1166
1167function hexDouble(num) {
1168  var str = num.toString(16).toUpperCase();
1169  return (str.length < 2) ? "0" + str : str;
1170}
1171
1172
1173//create a list of reverse color names
1174var reverseNames = {};
1175for (var name in colorName) {
1176   reverseNames[colorName[name]] = name;
1177}
1178
1179/* MIT license */
1180
1181
1182
1183var Color = function (obj) {
1184	if (obj instanceof Color) {
1185		return obj;
1186	}
1187	if (!(this instanceof Color)) {
1188		return new Color(obj);
1189	}
1190
1191	this.valid = false;
1192	this.values = {
1193		rgb: [0, 0, 0],
1194		hsl: [0, 0, 0],
1195		hsv: [0, 0, 0],
1196		hwb: [0, 0, 0],
1197		cmyk: [0, 0, 0, 0],
1198		alpha: 1
1199	};
1200
1201	// parse Color() argument
1202	var vals;
1203	if (typeof obj === 'string') {
1204		vals = colorString.getRgba(obj);
1205		if (vals) {
1206			this.setValues('rgb', vals);
1207		} else if (vals = colorString.getHsla(obj)) {
1208			this.setValues('hsl', vals);
1209		} else if (vals = colorString.getHwb(obj)) {
1210			this.setValues('hwb', vals);
1211		}
1212	} else if (typeof obj === 'object') {
1213		vals = obj;
1214		if (vals.r !== undefined || vals.red !== undefined) {
1215			this.setValues('rgb', vals);
1216		} else if (vals.l !== undefined || vals.lightness !== undefined) {
1217			this.setValues('hsl', vals);
1218		} else if (vals.v !== undefined || vals.value !== undefined) {
1219			this.setValues('hsv', vals);
1220		} else if (vals.w !== undefined || vals.whiteness !== undefined) {
1221			this.setValues('hwb', vals);
1222		} else if (vals.c !== undefined || vals.cyan !== undefined) {
1223			this.setValues('cmyk', vals);
1224		}
1225	}
1226};
1227
1228Color.prototype = {
1229	isValid: function () {
1230		return this.valid;
1231	},
1232	rgb: function () {
1233		return this.setSpace('rgb', arguments);
1234	},
1235	hsl: function () {
1236		return this.setSpace('hsl', arguments);
1237	},
1238	hsv: function () {
1239		return this.setSpace('hsv', arguments);
1240	},
1241	hwb: function () {
1242		return this.setSpace('hwb', arguments);
1243	},
1244	cmyk: function () {
1245		return this.setSpace('cmyk', arguments);
1246	},
1247
1248	rgbArray: function () {
1249		return this.values.rgb;
1250	},
1251	hslArray: function () {
1252		return this.values.hsl;
1253	},
1254	hsvArray: function () {
1255		return this.values.hsv;
1256	},
1257	hwbArray: function () {
1258		var values = this.values;
1259		if (values.alpha !== 1) {
1260			return values.hwb.concat([values.alpha]);
1261		}
1262		return values.hwb;
1263	},
1264	cmykArray: function () {
1265		return this.values.cmyk;
1266	},
1267	rgbaArray: function () {
1268		var values = this.values;
1269		return values.rgb.concat([values.alpha]);
1270	},
1271	hslaArray: function () {
1272		var values = this.values;
1273		return values.hsl.concat([values.alpha]);
1274	},
1275	alpha: function (val) {
1276		if (val === undefined) {
1277			return this.values.alpha;
1278		}
1279		this.setValues('alpha', val);
1280		return this;
1281	},
1282
1283	red: function (val) {
1284		return this.setChannel('rgb', 0, val);
1285	},
1286	green: function (val) {
1287		return this.setChannel('rgb', 1, val);
1288	},
1289	blue: function (val) {
1290		return this.setChannel('rgb', 2, val);
1291	},
1292	hue: function (val) {
1293		if (val) {
1294			val %= 360;
1295			val = val < 0 ? 360 + val : val;
1296		}
1297		return this.setChannel('hsl', 0, val);
1298	},
1299	saturation: function (val) {
1300		return this.setChannel('hsl', 1, val);
1301	},
1302	lightness: function (val) {
1303		return this.setChannel('hsl', 2, val);
1304	},
1305	saturationv: function (val) {
1306		return this.setChannel('hsv', 1, val);
1307	},
1308	whiteness: function (val) {
1309		return this.setChannel('hwb', 1, val);
1310	},
1311	blackness: function (val) {
1312		return this.setChannel('hwb', 2, val);
1313	},
1314	value: function (val) {
1315		return this.setChannel('hsv', 2, val);
1316	},
1317	cyan: function (val) {
1318		return this.setChannel('cmyk', 0, val);
1319	},
1320	magenta: function (val) {
1321		return this.setChannel('cmyk', 1, val);
1322	},
1323	yellow: function (val) {
1324		return this.setChannel('cmyk', 2, val);
1325	},
1326	black: function (val) {
1327		return this.setChannel('cmyk', 3, val);
1328	},
1329
1330	hexString: function () {
1331		return colorString.hexString(this.values.rgb);
1332	},
1333	rgbString: function () {
1334		return colorString.rgbString(this.values.rgb, this.values.alpha);
1335	},
1336	rgbaString: function () {
1337		return colorString.rgbaString(this.values.rgb, this.values.alpha);
1338	},
1339	percentString: function () {
1340		return colorString.percentString(this.values.rgb, this.values.alpha);
1341	},
1342	hslString: function () {
1343		return colorString.hslString(this.values.hsl, this.values.alpha);
1344	},
1345	hslaString: function () {
1346		return colorString.hslaString(this.values.hsl, this.values.alpha);
1347	},
1348	hwbString: function () {
1349		return colorString.hwbString(this.values.hwb, this.values.alpha);
1350	},
1351	keyword: function () {
1352		return colorString.keyword(this.values.rgb, this.values.alpha);
1353	},
1354
1355	rgbNumber: function () {
1356		var rgb = this.values.rgb;
1357		return (rgb[0] << 16) | (rgb[1] << 8) | rgb[2];
1358	},
1359
1360	luminosity: function () {
1361		// http://www.w3.org/TR/WCAG20/#relativeluminancedef
1362		var rgb = this.values.rgb;
1363		var lum = [];
1364		for (var i = 0; i < rgb.length; i++) {
1365			var chan = rgb[i] / 255;
1366			lum[i] = (chan <= 0.03928) ? chan / 12.92 : Math.pow(((chan + 0.055) / 1.055), 2.4);
1367		}
1368		return 0.2126 * lum[0] + 0.7152 * lum[1] + 0.0722 * lum[2];
1369	},
1370
1371	contrast: function (color2) {
1372		// http://www.w3.org/TR/WCAG20/#contrast-ratiodef
1373		var lum1 = this.luminosity();
1374		var lum2 = color2.luminosity();
1375		if (lum1 > lum2) {
1376			return (lum1 + 0.05) / (lum2 + 0.05);
1377		}
1378		return (lum2 + 0.05) / (lum1 + 0.05);
1379	},
1380
1381	level: function (color2) {
1382		var contrastRatio = this.contrast(color2);
1383		if (contrastRatio >= 7.1) {
1384			return 'AAA';
1385		}
1386
1387		return (contrastRatio >= 4.5) ? 'AA' : '';
1388	},
1389
1390	dark: function () {
1391		// YIQ equation from http://24ways.org/2010/calculating-color-contrast
1392		var rgb = this.values.rgb;
1393		var yiq = (rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000;
1394		return yiq < 128;
1395	},
1396
1397	light: function () {
1398		return !this.dark();
1399	},
1400
1401	negate: function () {
1402		var rgb = [];
1403		for (var i = 0; i < 3; i++) {
1404			rgb[i] = 255 - this.values.rgb[i];
1405		}
1406		this.setValues('rgb', rgb);
1407		return this;
1408	},
1409
1410	lighten: function (ratio) {
1411		var hsl = this.values.hsl;
1412		hsl[2] += hsl[2] * ratio;
1413		this.setValues('hsl', hsl);
1414		return this;
1415	},
1416
1417	darken: function (ratio) {
1418		var hsl = this.values.hsl;
1419		hsl[2] -= hsl[2] * ratio;
1420		this.setValues('hsl', hsl);
1421		return this;
1422	},
1423
1424	saturate: function (ratio) {
1425		var hsl = this.values.hsl;
1426		hsl[1] += hsl[1] * ratio;
1427		this.setValues('hsl', hsl);
1428		return this;
1429	},
1430
1431	desaturate: function (ratio) {
1432		var hsl = this.values.hsl;
1433		hsl[1] -= hsl[1] * ratio;
1434		this.setValues('hsl', hsl);
1435		return this;
1436	},
1437
1438	whiten: function (ratio) {
1439		var hwb = this.values.hwb;
1440		hwb[1] += hwb[1] * ratio;
1441		this.setValues('hwb', hwb);
1442		return this;
1443	},
1444
1445	blacken: function (ratio) {
1446		var hwb = this.values.hwb;
1447		hwb[2] += hwb[2] * ratio;
1448		this.setValues('hwb', hwb);
1449		return this;
1450	},
1451
1452	greyscale: function () {
1453		var rgb = this.values.rgb;
1454		// http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale
1455		var val = rgb[0] * 0.3 + rgb[1] * 0.59 + rgb[2] * 0.11;
1456		this.setValues('rgb', [val, val, val]);
1457		return this;
1458	},
1459
1460	clearer: function (ratio) {
1461		var alpha = this.values.alpha;
1462		this.setValues('alpha', alpha - (alpha * ratio));
1463		return this;
1464	},
1465
1466	opaquer: function (ratio) {
1467		var alpha = this.values.alpha;
1468		this.setValues('alpha', alpha + (alpha * ratio));
1469		return this;
1470	},
1471
1472	rotate: function (degrees) {
1473		var hsl = this.values.hsl;
1474		var hue = (hsl[0] + degrees) % 360;
1475		hsl[0] = hue < 0 ? 360 + hue : hue;
1476		this.setValues('hsl', hsl);
1477		return this;
1478	},
1479
1480	/**
1481	 * Ported from sass implementation in C
1482	 * https://github.com/sass/libsass/blob/0e6b4a2850092356aa3ece07c6b249f0221caced/functions.cpp#L209
1483	 */
1484	mix: function (mixinColor, weight) {
1485		var color1 = this;
1486		var color2 = mixinColor;
1487		var p = weight === undefined ? 0.5 : weight;
1488
1489		var w = 2 * p - 1;
1490		var a = color1.alpha() - color2.alpha();
1491
1492		var w1 = (((w * a === -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
1493		var w2 = 1 - w1;
1494
1495		return this
1496			.rgb(
1497				w1 * color1.red() + w2 * color2.red(),
1498				w1 * color1.green() + w2 * color2.green(),
1499				w1 * color1.blue() + w2 * color2.blue()
1500			)
1501			.alpha(color1.alpha() * p + color2.alpha() * (1 - p));
1502	},
1503
1504	toJSON: function () {
1505		return this.rgb();
1506	},
1507
1508	clone: function () {
1509		// NOTE(SB): using node-clone creates a dependency to Buffer when using browserify,
1510		// making the final build way to big to embed in Chart.js. So let's do it manually,
1511		// assuming that values to clone are 1 dimension arrays containing only numbers,
1512		// except 'alpha' which is a number.
1513		var result = new Color();
1514		var source = this.values;
1515		var target = result.values;
1516		var value, type;
1517
1518		for (var prop in source) {
1519			if (source.hasOwnProperty(prop)) {
1520				value = source[prop];
1521				type = ({}).toString.call(value);
1522				if (type === '[object Array]') {
1523					target[prop] = value.slice(0);
1524				} else if (type === '[object Number]') {
1525					target[prop] = value;
1526				} else {
1527					console.error('unexpected color value:', value);
1528				}
1529			}
1530		}
1531
1532		return result;
1533	}
1534};
1535
1536Color.prototype.spaces = {
1537	rgb: ['red', 'green', 'blue'],
1538	hsl: ['hue', 'saturation', 'lightness'],
1539	hsv: ['hue', 'saturation', 'value'],
1540	hwb: ['hue', 'whiteness', 'blackness'],
1541	cmyk: ['cyan', 'magenta', 'yellow', 'black']
1542};
1543
1544Color.prototype.maxes = {
1545	rgb: [255, 255, 255],
1546	hsl: [360, 100, 100],
1547	hsv: [360, 100, 100],
1548	hwb: [360, 100, 100],
1549	cmyk: [100, 100, 100, 100]
1550};
1551
1552Color.prototype.getValues = function (space) {
1553	var values = this.values;
1554	var vals = {};
1555
1556	for (var i = 0; i < space.length; i++) {
1557		vals[space.charAt(i)] = values[space][i];
1558	}
1559
1560	if (values.alpha !== 1) {
1561		vals.a = values.alpha;
1562	}
1563
1564	// {r: 255, g: 255, b: 255, a: 0.4}
1565	return vals;
1566};
1567
1568Color.prototype.setValues = function (space, vals) {
1569	var values = this.values;
1570	var spaces = this.spaces;
1571	var maxes = this.maxes;
1572	var alpha = 1;
1573	var i;
1574
1575	this.valid = true;
1576
1577	if (space === 'alpha') {
1578		alpha = vals;
1579	} else if (vals.length) {
1580		// [10, 10, 10]
1581		values[space] = vals.slice(0, space.length);
1582		alpha = vals[space.length];
1583	} else if (vals[space.charAt(0)] !== undefined) {
1584		// {r: 10, g: 10, b: 10}
1585		for (i = 0; i < space.length; i++) {
1586			values[space][i] = vals[space.charAt(i)];
1587		}
1588
1589		alpha = vals.a;
1590	} else if (vals[spaces[space][0]] !== undefined) {
1591		// {red: 10, green: 10, blue: 10}
1592		var chans = spaces[space];
1593
1594		for (i = 0; i < space.length; i++) {
1595			values[space][i] = vals[chans[i]];
1596		}
1597
1598		alpha = vals.alpha;
1599	}
1600
1601	values.alpha = Math.max(0, Math.min(1, (alpha === undefined ? values.alpha : alpha)));
1602
1603	if (space === 'alpha') {
1604		return false;
1605	}
1606
1607	var capped;
1608
1609	// cap values of the space prior converting all values
1610	for (i = 0; i < space.length; i++) {
1611		capped = Math.max(0, Math.min(maxes[space][i], values[space][i]));
1612		values[space][i] = Math.round(capped);
1613	}
1614
1615	// convert to all the other color spaces
1616	for (var sname in spaces) {
1617		if (sname !== space) {
1618			values[sname] = colorConvert[space][sname](values[space]);
1619		}
1620	}
1621
1622	return true;
1623};
1624
1625Color.prototype.setSpace = function (space, args) {
1626	var vals = args[0];
1627
1628	if (vals === undefined) {
1629		// color.rgb()
1630		return this.getValues(space);
1631	}
1632
1633	// color.rgb(10, 10, 10)
1634	if (typeof vals === 'number') {
1635		vals = Array.prototype.slice.call(args);
1636	}
1637
1638	this.setValues(space, vals);
1639	return this;
1640};
1641
1642Color.prototype.setChannel = function (space, index, val) {
1643	var svalues = this.values[space];
1644	if (val === undefined) {
1645		// color.red()
1646		return svalues[index];
1647	} else if (val === svalues[index]) {
1648		// color.red(color.red())
1649		return this;
1650	}
1651
1652	// color.red(100)
1653	svalues[index] = val;
1654	this.setValues(space, svalues);
1655
1656	return this;
1657};
1658
1659if (typeof window !== 'undefined') {
1660	window.Color = Color;
1661}
1662
1663var chartjsColor = Color;
1664
1665/**
1666 * @namespace Chart.helpers
1667 */
1668var helpers = {
1669	/**
1670	 * An empty function that can be used, for example, for optional callback.
1671	 */
1672	noop: function() {},
1673
1674	/**
1675	 * Returns a unique id, sequentially generated from a global variable.
1676	 * @returns {Number}
1677	 * @function
1678	 */
1679	uid: (function() {
1680		var id = 0;
1681		return function() {
1682			return id++;
1683		};
1684	}()),
1685
1686	/**
1687	 * Returns true if `value` is neither null nor undefined, else returns false.
1688	 * @param {*} value - The value to test.
1689	 * @returns {Boolean}
1690	 * @since 2.7.0
1691	 */
1692	isNullOrUndef: function(value) {
1693		return value === null || typeof value === 'undefined';
1694	},
1695
1696	/**
1697	 * Returns true if `value` is an array (including typed arrays), else returns false.
1698	 * @param {*} value - The value to test.
1699	 * @returns {Boolean}
1700	 * @function
1701	 */
1702	isArray: function(value) {
1703		if (Array.isArray && Array.isArray(value)) {
1704			return true;
1705		}
1706		var type = Object.prototype.toString.call(value);
1707		if (type.substr(0, 7) === '[object' && type.substr(-6) === 'Array]') {
1708			return true;
1709		}
1710		return false;
1711	},
1712
1713	/**
1714	 * Returns true if `value` is an object (excluding null), else returns false.
1715	 * @param {*} value - The value to test.
1716	 * @returns {Boolean}
1717	 * @since 2.7.0
1718	 */
1719	isObject: function(value) {
1720		return value !== null && Object.prototype.toString.call(value) === '[object Object]';
1721	},
1722
1723	/**
1724	 * Returns true if `value` is a finite number, else returns false
1725	 * @param {*} value  - The value to test.
1726	 * @returns {Boolean}
1727	 */
1728	isFinite: function(value) {
1729		return (typeof value === 'number' || value instanceof Number) && isFinite(value);
1730	},
1731
1732	/**
1733	 * Returns `value` if defined, else returns `defaultValue`.
1734	 * @param {*} value - The value to return if defined.
1735	 * @param {*} defaultValue - The value to return if `value` is undefined.
1736	 * @returns {*}
1737	 */
1738	valueOrDefault: function(value, defaultValue) {
1739		return typeof value === 'undefined' ? defaultValue : value;
1740	},
1741
1742	/**
1743	 * Returns value at the given `index` in array if defined, else returns `defaultValue`.
1744	 * @param {Array} value - The array to lookup for value at `index`.
1745	 * @param {Number} index - The index in `value` to lookup for value.
1746	 * @param {*} defaultValue - The value to return if `value[index]` is undefined.
1747	 * @returns {*}
1748	 */
1749	valueAtIndexOrDefault: function(value, index, defaultValue) {
1750		return helpers.valueOrDefault(helpers.isArray(value) ? value[index] : value, defaultValue);
1751	},
1752
1753	/**
1754	 * Calls `fn` with the given `args` in the scope defined by `thisArg` and returns the
1755	 * value returned by `fn`. If `fn` is not a function, this method returns undefined.
1756	 * @param {Function} fn - The function to call.
1757	 * @param {Array|undefined|null} args - The arguments with which `fn` should be called.
1758	 * @param {Object} [thisArg] - The value of `this` provided for the call to `fn`.
1759	 * @returns {*}
1760	 */
1761	callback: function(fn, args, thisArg) {
1762		if (fn && typeof fn.call === 'function') {
1763			return fn.apply(thisArg, args);
1764		}
1765	},
1766
1767	/**
1768	 * Note(SB) for performance sake, this method should only be used when loopable type
1769	 * is unknown or in none intensive code (not called often and small loopable). Else
1770	 * it's preferable to use a regular for() loop and save extra function calls.
1771	 * @param {Object|Array} loopable - The object or array to be iterated.
1772	 * @param {Function} fn - The function to call for each item.
1773	 * @param {Object} [thisArg] - The value of `this` provided for the call to `fn`.
1774	 * @param {Boolean} [reverse] - If true, iterates backward on the loopable.
1775	 */
1776	each: function(loopable, fn, thisArg, reverse) {
1777		var i, len, keys;
1778		if (helpers.isArray(loopable)) {
1779			len = loopable.length;
1780			if (reverse) {
1781				for (i = len - 1; i >= 0; i--) {
1782					fn.call(thisArg, loopable[i], i);
1783				}
1784			} else {
1785				for (i = 0; i < len; i++) {
1786					fn.call(thisArg, loopable[i], i);
1787				}
1788			}
1789		} else if (helpers.isObject(loopable)) {
1790			keys = Object.keys(loopable);
1791			len = keys.length;
1792			for (i = 0; i < len; i++) {
1793				fn.call(thisArg, loopable[keys[i]], keys[i]);
1794			}
1795		}
1796	},
1797
1798	/**
1799	 * Returns true if the `a0` and `a1` arrays have the same content, else returns false.
1800	 * @see https://stackoverflow.com/a/14853974
1801	 * @param {Array} a0 - The array to compare
1802	 * @param {Array} a1 - The array to compare
1803	 * @returns {Boolean}
1804	 */
1805	arrayEquals: function(a0, a1) {
1806		var i, ilen, v0, v1;
1807
1808		if (!a0 || !a1 || a0.length !== a1.length) {
1809			return false;
1810		}
1811
1812		for (i = 0, ilen = a0.length; i < ilen; ++i) {
1813			v0 = a0[i];
1814			v1 = a1[i];
1815
1816			if (v0 instanceof Array && v1 instanceof Array) {
1817				if (!helpers.arrayEquals(v0, v1)) {
1818					return false;
1819				}
1820			} else if (v0 !== v1) {
1821				// NOTE: two different object instances will never be equal: {x:20} != {x:20}
1822				return false;
1823			}
1824		}
1825
1826		return true;
1827	},
1828
1829	/**
1830	 * Returns a deep copy of `source` without keeping references on objects and arrays.
1831	 * @param {*} source - The value to clone.
1832	 * @returns {*}
1833	 */
1834	clone: function(source) {
1835		if (helpers.isArray(source)) {
1836			return source.map(helpers.clone);
1837		}
1838
1839		if (helpers.isObject(source)) {
1840			var target = {};
1841			var keys = Object.keys(source);
1842			var klen = keys.length;
1843			var k = 0;
1844
1845			for (; k < klen; ++k) {
1846				target[keys[k]] = helpers.clone(source[keys[k]]);
1847			}
1848
1849			return target;
1850		}
1851
1852		return source;
1853	},
1854
1855	/**
1856	 * The default merger when Chart.helpers.merge is called without merger option.
1857	 * Note(SB): this method is also used by configMerge and scaleMerge as fallback.
1858	 * @private
1859	 */
1860	_merger: function(key, target, source, options) {
1861		var tval = target[key];
1862		var sval = source[key];
1863
1864		if (helpers.isObject(tval) && helpers.isObject(sval)) {
1865			helpers.merge(tval, sval, options);
1866		} else {
1867			target[key] = helpers.clone(sval);
1868		}
1869	},
1870
1871	/**
1872	 * Merges source[key] in target[key] only if target[key] is undefined.
1873	 * @private
1874	 */
1875	_mergerIf: function(key, target, source) {
1876		var tval = target[key];
1877		var sval = source[key];
1878
1879		if (helpers.isObject(tval) && helpers.isObject(sval)) {
1880			helpers.mergeIf(tval, sval);
1881		} else if (!target.hasOwnProperty(key)) {
1882			target[key] = helpers.clone(sval);
1883		}
1884	},
1885
1886	/**
1887	 * Recursively deep copies `source` properties into `target` with the given `options`.
1888	 * IMPORTANT: `target` is not cloned and will be updated with `source` properties.
1889	 * @param {Object} target - The target object in which all sources are merged into.
1890	 * @param {Object|Array(Object)} source - Object(s) to merge into `target`.
1891	 * @param {Object} [options] - Merging options:
1892	 * @param {Function} [options.merger] - The merge method (key, target, source, options)
1893	 * @returns {Object} The `target` object.
1894	 */
1895	merge: function(target, source, options) {
1896		var sources = helpers.isArray(source) ? source : [source];
1897		var ilen = sources.length;
1898		var merge, i, keys, klen, k;
1899
1900		if (!helpers.isObject(target)) {
1901			return target;
1902		}
1903
1904		options = options || {};
1905		merge = options.merger || helpers._merger;
1906
1907		for (i = 0; i < ilen; ++i) {
1908			source = sources[i];
1909			if (!helpers.isObject(source)) {
1910				continue;
1911			}
1912
1913			keys = Object.keys(source);
1914			for (k = 0, klen = keys.length; k < klen; ++k) {
1915				merge(keys[k], target, source, options);
1916			}
1917		}
1918
1919		return target;
1920	},
1921
1922	/**
1923	 * Recursively deep copies `source` properties into `target` *only* if not defined in target.
1924	 * IMPORTANT: `target` is not cloned and will be updated with `source` properties.
1925	 * @param {Object} target - The target object in which all sources are merged into.
1926	 * @param {Object|Array(Object)} source - Object(s) to merge into `target`.
1927	 * @returns {Object} The `target` object.
1928	 */
1929	mergeIf: function(target, source) {
1930		return helpers.merge(target, source, {merger: helpers._mergerIf});
1931	},
1932
1933	/**
1934	 * Applies the contents of two or more objects together into the first object.
1935	 * @param {Object} target - The target object in which all objects are merged into.
1936	 * @param {Object} arg1 - Object containing additional properties to merge in target.
1937	 * @param {Object} argN - Additional objects containing properties to merge in target.
1938	 * @returns {Object} The `target` object.
1939	 */
1940	extend: function(target) {
1941		var setFn = function(value, key) {
1942			target[key] = value;
1943		};
1944		for (var i = 1, ilen = arguments.length; i < ilen; ++i) {
1945			helpers.each(arguments[i], setFn);
1946		}
1947		return target;
1948	},
1949
1950	/**
1951	 * Basic javascript inheritance based on the model created in Backbone.js
1952	 */
1953	inherits: function(extensions) {
1954		var me = this;
1955		var ChartElement = (extensions && extensions.hasOwnProperty('constructor')) ? extensions.constructor : function() {
1956			return me.apply(this, arguments);
1957		};
1958
1959		var Surrogate = function() {
1960			this.constructor = ChartElement;
1961		};
1962
1963		Surrogate.prototype = me.prototype;
1964		ChartElement.prototype = new Surrogate();
1965		ChartElement.extend = helpers.inherits;
1966
1967		if (extensions) {
1968			helpers.extend(ChartElement.prototype, extensions);
1969		}
1970
1971		ChartElement.__super__ = me.prototype;
1972		return ChartElement;
1973	}
1974};
1975
1976var helpers_core = helpers;
1977
1978// DEPRECATIONS
1979
1980/**
1981 * Provided for backward compatibility, use Chart.helpers.callback instead.
1982 * @function Chart.helpers.callCallback
1983 * @deprecated since version 2.6.0
1984 * @todo remove at version 3
1985 * @private
1986 */
1987helpers.callCallback = helpers.callback;
1988
1989/**
1990 * Provided for backward compatibility, use Array.prototype.indexOf instead.
1991 * Array.prototype.indexOf compatibility: Chrome, Opera, Safari, FF1.5+, IE9+
1992 * @function Chart.helpers.indexOf
1993 * @deprecated since version 2.7.0
1994 * @todo remove at version 3
1995 * @private
1996 */
1997helpers.indexOf = function(array, item, fromIndex) {
1998	return Array.prototype.indexOf.call(array, item, fromIndex);
1999};
2000
2001/**
2002 * Provided for backward compatibility, use Chart.helpers.valueOrDefault instead.
2003 * @function Chart.helpers.getValueOrDefault
2004 * @deprecated since version 2.7.0
2005 * @todo remove at version 3
2006 * @private
2007 */
2008helpers.getValueOrDefault = helpers.valueOrDefault;
2009
2010/**
2011 * Provided for backward compatibility, use Chart.helpers.valueAtIndexOrDefault instead.
2012 * @function Chart.helpers.getValueAtIndexOrDefault
2013 * @deprecated since version 2.7.0
2014 * @todo remove at version 3
2015 * @private
2016 */
2017helpers.getValueAtIndexOrDefault = helpers.valueAtIndexOrDefault;
2018
2019/**
2020 * Easing functions adapted from Robert Penner's easing equations.
2021 * @namespace Chart.helpers.easingEffects
2022 * @see http://www.robertpenner.com/easing/
2023 */
2024var effects = {
2025	linear: function(t) {
2026		return t;
2027	},
2028
2029	easeInQuad: function(t) {
2030		return t * t;
2031	},
2032
2033	easeOutQuad: function(t) {
2034		return -t * (t - 2);
2035	},
2036
2037	easeInOutQuad: function(t) {
2038		if ((t /= 0.5) < 1) {
2039			return 0.5 * t * t;
2040		}
2041		return -0.5 * ((--t) * (t - 2) - 1);
2042	},
2043
2044	easeInCubic: function(t) {
2045		return t * t * t;
2046	},
2047
2048	easeOutCubic: function(t) {
2049		return (t = t - 1) * t * t + 1;
2050	},
2051
2052	easeInOutCubic: function(t) {
2053		if ((t /= 0.5) < 1) {
2054			return 0.5 * t * t * t;
2055		}
2056		return 0.5 * ((t -= 2) * t * t + 2);
2057	},
2058
2059	easeInQuart: function(t) {
2060		return t * t * t * t;
2061	},
2062
2063	easeOutQuart: function(t) {
2064		return -((t = t - 1) * t * t * t - 1);
2065	},
2066
2067	easeInOutQuart: function(t) {
2068		if ((t /= 0.5) < 1) {
2069			return 0.5 * t * t * t * t;
2070		}
2071		return -0.5 * ((t -= 2) * t * t * t - 2);
2072	},
2073
2074	easeInQuint: function(t) {
2075		return t * t * t * t * t;
2076	},
2077
2078	easeOutQuint: function(t) {
2079		return (t = t - 1) * t * t * t * t + 1;
2080	},
2081
2082	easeInOutQuint: function(t) {
2083		if ((t /= 0.5) < 1) {
2084			return 0.5 * t * t * t * t * t;
2085		}
2086		return 0.5 * ((t -= 2) * t * t * t * t + 2);
2087	},
2088
2089	easeInSine: function(t) {
2090		return -Math.cos(t * (Math.PI / 2)) + 1;
2091	},
2092
2093	easeOutSine: function(t) {
2094		return Math.sin(t * (Math.PI / 2));
2095	},
2096
2097	easeInOutSine: function(t) {
2098		return -0.5 * (Math.cos(Math.PI * t) - 1);
2099	},
2100
2101	easeInExpo: function(t) {
2102		return (t === 0) ? 0 : Math.pow(2, 10 * (t - 1));
2103	},
2104
2105	easeOutExpo: function(t) {
2106		return (t === 1) ? 1 : -Math.pow(2, -10 * t) + 1;
2107	},
2108
2109	easeInOutExpo: function(t) {
2110		if (t === 0) {
2111			return 0;
2112		}
2113		if (t === 1) {
2114			return 1;
2115		}
2116		if ((t /= 0.5) < 1) {
2117			return 0.5 * Math.pow(2, 10 * (t - 1));
2118		}
2119		return 0.5 * (-Math.pow(2, -10 * --t) + 2);
2120	},
2121
2122	easeInCirc: function(t) {
2123		if (t >= 1) {
2124			return t;
2125		}
2126		return -(Math.sqrt(1 - t * t) - 1);
2127	},
2128
2129	easeOutCirc: function(t) {
2130		return Math.sqrt(1 - (t = t - 1) * t);
2131	},
2132
2133	easeInOutCirc: function(t) {
2134		if ((t /= 0.5) < 1) {
2135			return -0.5 * (Math.sqrt(1 - t * t) - 1);
2136		}
2137		return 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1);
2138	},
2139
2140	easeInElastic: function(t) {
2141		var s = 1.70158;
2142		var p = 0;
2143		var a = 1;
2144		if (t === 0) {
2145			return 0;
2146		}
2147		if (t === 1) {
2148			return 1;
2149		}
2150		if (!p) {
2151			p = 0.3;
2152		}
2153		if (a < 1) {
2154			a = 1;
2155			s = p / 4;
2156		} else {
2157			s = p / (2 * Math.PI) * Math.asin(1 / a);
2158		}
2159		return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
2160	},
2161
2162	easeOutElastic: function(t) {
2163		var s = 1.70158;
2164		var p = 0;
2165		var a = 1;
2166		if (t === 0) {
2167			return 0;
2168		}
2169		if (t === 1) {
2170			return 1;
2171		}
2172		if (!p) {
2173			p = 0.3;
2174		}
2175		if (a < 1) {
2176			a = 1;
2177			s = p / 4;
2178		} else {
2179			s = p / (2 * Math.PI) * Math.asin(1 / a);
2180		}
2181		return a * Math.pow(2, -10 * t) * Math.sin((t - s) * (2 * Math.PI) / p) + 1;
2182	},
2183
2184	easeInOutElastic: function(t) {
2185		var s = 1.70158;
2186		var p = 0;
2187		var a = 1;
2188		if (t === 0) {
2189			return 0;
2190		}
2191		if ((t /= 0.5) === 2) {
2192			return 1;
2193		}
2194		if (!p) {
2195			p = 0.45;
2196		}
2197		if (a < 1) {
2198			a = 1;
2199			s = p / 4;
2200		} else {
2201			s = p / (2 * Math.PI) * Math.asin(1 / a);
2202		}
2203		if (t < 1) {
2204			return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
2205		}
2206		return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p) * 0.5 + 1;
2207	},
2208	easeInBack: function(t) {
2209		var s = 1.70158;
2210		return t * t * ((s + 1) * t - s);
2211	},
2212
2213	easeOutBack: function(t) {
2214		var s = 1.70158;
2215		return (t = t - 1) * t * ((s + 1) * t + s) + 1;
2216	},
2217
2218	easeInOutBack: function(t) {
2219		var s = 1.70158;
2220		if ((t /= 0.5) < 1) {
2221			return 0.5 * (t * t * (((s *= (1.525)) + 1) * t - s));
2222		}
2223		return 0.5 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
2224	},
2225
2226	easeInBounce: function(t) {
2227		return 1 - effects.easeOutBounce(1 - t);
2228	},
2229
2230	easeOutBounce: function(t) {
2231		if (t < (1 / 2.75)) {
2232			return 7.5625 * t * t;
2233		}
2234		if (t < (2 / 2.75)) {
2235			return 7.5625 * (t -= (1.5 / 2.75)) * t + 0.75;
2236		}
2237		if (t < (2.5 / 2.75)) {
2238			return 7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375;
2239		}
2240		return 7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375;
2241	},
2242
2243	easeInOutBounce: function(t) {
2244		if (t < 0.5) {
2245			return effects.easeInBounce(t * 2) * 0.5;
2246		}
2247		return effects.easeOutBounce(t * 2 - 1) * 0.5 + 0.5;
2248	}
2249};
2250
2251var helpers_easing = {
2252	effects: effects
2253};
2254
2255// DEPRECATIONS
2256
2257/**
2258 * Provided for backward compatibility, use Chart.helpers.easing.effects instead.
2259 * @function Chart.helpers.easingEffects
2260 * @deprecated since version 2.7.0
2261 * @todo remove at version 3
2262 * @private
2263 */
2264helpers_core.easingEffects = effects;
2265
2266var PI = Math.PI;
2267var RAD_PER_DEG = PI / 180;
2268var DOUBLE_PI = PI * 2;
2269var HALF_PI = PI / 2;
2270var QUARTER_PI = PI / 4;
2271var TWO_THIRDS_PI = PI * 2 / 3;
2272
2273/**
2274 * @namespace Chart.helpers.canvas
2275 */
2276var exports$1 = {
2277	/**
2278	 * Clears the entire canvas associated to the given `chart`.
2279	 * @param {Chart} chart - The chart for which to clear the canvas.
2280	 */
2281	clear: function(chart) {
2282		chart.ctx.clearRect(0, 0, chart.width, chart.height);
2283	},
2284
2285	/**
2286	 * Creates a "path" for a rectangle with rounded corners at position (x, y) with a
2287	 * given size (width, height) and the same `radius` for all corners.
2288	 * @param {CanvasRenderingContext2D} ctx - The canvas 2D Context.
2289	 * @param {Number} x - The x axis of the coordinate for the rectangle starting point.
2290	 * @param {Number} y - The y axis of the coordinate for the rectangle starting point.
2291	 * @param {Number} width - The rectangle's width.
2292	 * @param {Number} height - The rectangle's height.
2293	 * @param {Number} radius - The rounded amount (in pixels) for the four corners.
2294	 * @todo handle `radius` as top-left, top-right, bottom-right, bottom-left array/object?
2295	 */
2296	roundedRect: function(ctx, x, y, width, height, radius) {
2297		if (radius) {
2298			var r = Math.min(radius, height / 2, width / 2);
2299			var left = x + r;
2300			var top = y + r;
2301			var right = x + width - r;
2302			var bottom = y + height - r;
2303
2304			ctx.moveTo(x, top);
2305			if (left < right && top < bottom) {
2306				ctx.arc(left, top, r, -PI, -HALF_PI);
2307				ctx.arc(right, top, r, -HALF_PI, 0);
2308				ctx.arc(right, bottom, r, 0, HALF_PI);
2309				ctx.arc(left, bottom, r, HALF_PI, PI);
2310			} else if (left < right) {
2311				ctx.moveTo(left, y);
2312				ctx.arc(right, top, r, -HALF_PI, HALF_PI);
2313				ctx.arc(left, top, r, HALF_PI, PI + HALF_PI);
2314			} else if (top < bottom) {
2315				ctx.arc(left, top, r, -PI, 0);
2316				ctx.arc(left, bottom, r, 0, PI);
2317			} else {
2318				ctx.arc(left, top, r, -PI, PI);
2319			}
2320			ctx.closePath();
2321			ctx.moveTo(x, y);
2322		} else {
2323			ctx.rect(x, y, width, height);
2324		}
2325	},
2326
2327	drawPoint: function(ctx, style, radius, x, y, rotation) {
2328		var type, xOffset, yOffset, size, cornerRadius;
2329		var rad = (rotation || 0) * RAD_PER_DEG;
2330
2331		if (style && typeof style === 'object') {
2332			type = style.toString();
2333			if (type === '[object HTMLImageElement]' || type === '[object HTMLCanvasElement]') {
2334				ctx.drawImage(style, x - style.width / 2, y - style.height / 2, style.width, style.height);
2335				return;
2336			}
2337		}
2338
2339		if (isNaN(radius) || radius <= 0) {
2340			return;
2341		}
2342
2343		ctx.beginPath();
2344
2345		switch (style) {
2346		// Default includes circle
2347		default:
2348			ctx.arc(x, y, radius, 0, DOUBLE_PI);
2349			ctx.closePath();
2350			break;
2351		case 'triangle':
2352			ctx.moveTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
2353			rad += TWO_THIRDS_PI;
2354			ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
2355			rad += TWO_THIRDS_PI;
2356			ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
2357			ctx.closePath();
2358			break;
2359		case 'rectRounded':
2360			// NOTE: the rounded rect implementation changed to use `arc` instead of
2361			// `quadraticCurveTo` since it generates better results when rect is
2362			// almost a circle. 0.516 (instead of 0.5) produces results with visually
2363			// closer proportion to the previous impl and it is inscribed in the
2364			// circle with `radius`. For more details, see the following PRs:
2365			// https://github.com/chartjs/Chart.js/issues/5597
2366			// https://github.com/chartjs/Chart.js/issues/5858
2367			cornerRadius = radius * 0.516;
2368			size = radius - cornerRadius;
2369			xOffset = Math.cos(rad + QUARTER_PI) * size;
2370			yOffset = Math.sin(rad + QUARTER_PI) * size;
2371			ctx.arc(x - xOffset, y - yOffset, cornerRadius, rad - PI, rad - HALF_PI);
2372			ctx.arc(x + yOffset, y - xOffset, cornerRadius, rad - HALF_PI, rad);
2373			ctx.arc(x + xOffset, y + yOffset, cornerRadius, rad, rad + HALF_PI);
2374			ctx.arc(x - yOffset, y + xOffset, cornerRadius, rad + HALF_PI, rad + PI);
2375			ctx.closePath();
2376			break;
2377		case 'rect':
2378			if (!rotation) {
2379				size = Math.SQRT1_2 * radius;
2380				ctx.rect(x - size, y - size, 2 * size, 2 * size);
2381				break;
2382			}
2383			rad += QUARTER_PI;
2384			/* falls through */
2385		case 'rectRot':
2386			xOffset = Math.cos(rad) * radius;
2387			yOffset = Math.sin(rad) * radius;
2388			ctx.moveTo(x - xOffset, y - yOffset);
2389			ctx.lineTo(x + yOffset, y - xOffset);
2390			ctx.lineTo(x + xOffset, y + yOffset);
2391			ctx.lineTo(x - yOffset, y + xOffset);
2392			ctx.closePath();
2393			break;
2394		case 'crossRot':
2395			rad += QUARTER_PI;
2396			/* falls through */
2397		case 'cross':
2398			xOffset = Math.cos(rad) * radius;
2399			yOffset = Math.sin(rad) * radius;
2400			ctx.moveTo(x - xOffset, y - yOffset);
2401			ctx.lineTo(x + xOffset, y + yOffset);
2402			ctx.moveTo(x + yOffset, y - xOffset);
2403			ctx.lineTo(x - yOffset, y + xOffset);
2404			break;
2405		case 'star':
2406			xOffset = Math.cos(rad) * radius;
2407			yOffset = Math.sin(rad) * radius;
2408			ctx.moveTo(x - xOffset, y - yOffset);
2409			ctx.lineTo(x + xOffset, y + yOffset);
2410			ctx.moveTo(x + yOffset, y - xOffset);
2411			ctx.lineTo(x - yOffset, y + xOffset);
2412			rad += QUARTER_PI;
2413			xOffset = Math.cos(rad) * radius;
2414			yOffset = Math.sin(rad) * radius;
2415			ctx.moveTo(x - xOffset, y - yOffset);
2416			ctx.lineTo(x + xOffset, y + yOffset);
2417			ctx.moveTo(x + yOffset, y - xOffset);
2418			ctx.lineTo(x - yOffset, y + xOffset);
2419			break;
2420		case 'line':
2421			xOffset = Math.cos(rad) * radius;
2422			yOffset = Math.sin(rad) * radius;
2423			ctx.moveTo(x - xOffset, y - yOffset);
2424			ctx.lineTo(x + xOffset, y + yOffset);
2425			break;
2426		case 'dash':
2427			ctx.moveTo(x, y);
2428			ctx.lineTo(x + Math.cos(rad) * radius, y + Math.sin(rad) * radius);
2429			break;
2430		}
2431
2432		ctx.fill();
2433		ctx.stroke();
2434	},
2435
2436	/**
2437	 * Returns true if the point is inside the rectangle
2438	 * @param {Object} point - The point to test
2439	 * @param {Object} area - The rectangle
2440	 * @returns {Boolean}
2441	 * @private
2442	 */
2443	_isPointInArea: function(point, area) {
2444		var epsilon = 1e-6; // 1e-6 is margin in pixels for accumulated error.
2445
2446		return point.x > area.left - epsilon && point.x < area.right + epsilon &&
2447			point.y > area.top - epsilon && point.y < area.bottom + epsilon;
2448	},
2449
2450	clipArea: function(ctx, area) {
2451		ctx.save();
2452		ctx.beginPath();
2453		ctx.rect(area.left, area.top, area.right - area.left, area.bottom - area.top);
2454		ctx.clip();
2455	},
2456
2457	unclipArea: function(ctx) {
2458		ctx.restore();
2459	},
2460
2461	lineTo: function(ctx, previous, target, flip) {
2462		var stepped = target.steppedLine;
2463		if (stepped) {
2464			if (stepped === 'middle') {
2465				var midpoint = (previous.x + target.x) / 2.0;
2466				ctx.lineTo(midpoint, flip ? target.y : previous.y);
2467				ctx.lineTo(midpoint, flip ? previous.y : target.y);
2468			} else if ((stepped === 'after' && !flip) || (stepped !== 'after' && flip)) {
2469				ctx.lineTo(previous.x, target.y);
2470			} else {
2471				ctx.lineTo(target.x, previous.y);
2472			}
2473			ctx.lineTo(target.x, target.y);
2474			return;
2475		}
2476
2477		if (!target.tension) {
2478			ctx.lineTo(target.x, target.y);
2479			return;
2480		}
2481
2482		ctx.bezierCurveTo(
2483			flip ? previous.controlPointPreviousX : previous.controlPointNextX,
2484			flip ? previous.controlPointPreviousY : previous.controlPointNextY,
2485			flip ? target.controlPointNextX : target.controlPointPreviousX,
2486			flip ? target.controlPointNextY : target.controlPointPreviousY,
2487			target.x,
2488			target.y);
2489	}
2490};
2491
2492var helpers_canvas = exports$1;
2493
2494// DEPRECATIONS
2495
2496/**
2497 * Provided for backward compatibility, use Chart.helpers.canvas.clear instead.
2498 * @namespace Chart.helpers.clear
2499 * @deprecated since version 2.7.0
2500 * @todo remove at version 3
2501 * @private
2502 */
2503helpers_core.clear = exports$1.clear;
2504
2505/**
2506 * Provided for backward compatibility, use Chart.helpers.canvas.roundedRect instead.
2507 * @namespace Chart.helpers.drawRoundedRectangle
2508 * @deprecated since version 2.7.0
2509 * @todo remove at version 3
2510 * @private
2511 */
2512helpers_core.drawRoundedRectangle = function(ctx) {
2513	ctx.beginPath();
2514	exports$1.roundedRect.apply(exports$1, arguments);
2515};
2516
2517var defaults = {
2518	/**
2519	 * @private
2520	 */
2521	_set: function(scope, values) {
2522		return helpers_core.merge(this[scope] || (this[scope] = {}), values);
2523	}
2524};
2525
2526defaults._set('global', {
2527	defaultColor: 'rgba(0,0,0,0.1)',
2528	defaultFontColor: '#666',
2529	defaultFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
2530	defaultFontSize: 12,
2531	defaultFontStyle: 'normal',
2532	defaultLineHeight: 1.2,
2533	showLines: true
2534});
2535
2536var core_defaults = defaults;
2537
2538var valueOrDefault = helpers_core.valueOrDefault;
2539
2540/**
2541 * Converts the given font object into a CSS font string.
2542 * @param {Object} font - A font object.
2543 * @return {String} The CSS font string. See https://developer.mozilla.org/en-US/docs/Web/CSS/font
2544 * @private
2545 */
2546function toFontString(font) {
2547	if (!font || helpers_core.isNullOrUndef(font.size) || helpers_core.isNullOrUndef(font.family)) {
2548		return null;
2549	}
2550
2551	return (font.style ? font.style + ' ' : '')
2552		+ (font.weight ? font.weight + ' ' : '')
2553		+ font.size + 'px '
2554		+ font.family;
2555}
2556
2557/**
2558 * @alias Chart.helpers.options
2559 * @namespace
2560 */
2561var helpers_options = {
2562	/**
2563	 * Converts the given line height `value` in pixels for a specific font `size`.
2564	 * @param {Number|String} value - The lineHeight to parse (eg. 1.6, '14px', '75%', '1.6em').
2565	 * @param {Number} size - The font size (in pixels) used to resolve relative `value`.
2566	 * @returns {Number} The effective line height in pixels (size * 1.2 if value is invalid).
2567	 * @see https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
2568	 * @since 2.7.0
2569	 */
2570	toLineHeight: function(value, size) {
2571		var matches = ('' + value).match(/^(normal|(\d+(?:\.\d+)?)(px|em|%)?)$/);
2572		if (!matches || matches[1] === 'normal') {
2573			return size * 1.2;
2574		}
2575
2576		value = +matches[2];
2577
2578		switch (matches[3]) {
2579		case 'px':
2580			return value;
2581		case '%':
2582			value /= 100;
2583			break;
2584		default:
2585			break;
2586		}
2587
2588		return size * value;
2589	},
2590
2591	/**
2592	 * Converts the given value into a padding object with pre-computed width/height.
2593	 * @param {Number|Object} value - If a number, set the value to all TRBL component,
2594	 *  else, if and object, use defined properties and sets undefined ones to 0.
2595	 * @returns {Object} The padding values (top, right, bottom, left, width, height)
2596	 * @since 2.7.0
2597	 */
2598	toPadding: function(value) {
2599		var t, r, b, l;
2600
2601		if (helpers_core.isObject(value)) {
2602			t = +value.top || 0;
2603			r = +value.right || 0;
2604			b = +value.bottom || 0;
2605			l = +value.left || 0;
2606		} else {
2607			t = r = b = l = +value || 0;
2608		}
2609
2610		return {
2611			top: t,
2612			right: r,
2613			bottom: b,
2614			left: l,
2615			height: t + b,
2616			width: l + r
2617		};
2618	},
2619
2620	/**
2621	 * Parses font options and returns the font object.
2622	 * @param {Object} options - A object that contains font options to be parsed.
2623	 * @return {Object} The font object.
2624	 * @todo Support font.* options and renamed to toFont().
2625	 * @private
2626	 */
2627	_parseFont: function(options) {
2628		var globalDefaults = core_defaults.global;
2629		var size = valueOrDefault(options.fontSize, globalDefaults.defaultFontSize);
2630		var font = {
2631			family: valueOrDefault(options.fontFamily, globalDefaults.defaultFontFamily),
2632			lineHeight: helpers_core.options.toLineHeight(valueOrDefault(options.lineHeight, globalDefaults.defaultLineHeight), size),
2633			size: size,
2634			style: valueOrDefault(options.fontStyle, globalDefaults.defaultFontStyle),
2635			weight: null,
2636			string: ''
2637		};
2638
2639		font.string = toFontString(font);
2640		return font;
2641	},
2642
2643	/**
2644	 * Evaluates the given `inputs` sequentially and returns the first defined value.
2645	 * @param {Array[]} inputs - An array of values, falling back to the last value.
2646	 * @param {Object} [context] - If defined and the current value is a function, the value
2647	 * is called with `context` as first argument and the result becomes the new input.
2648	 * @param {Number} [index] - If defined and the current value is an array, the value
2649	 * at `index` become the new input.
2650	 * @since 2.7.0
2651	 */
2652	resolve: function(inputs, context, index) {
2653		var i, ilen, value;
2654
2655		for (i = 0, ilen = inputs.length; i < ilen; ++i) {
2656			value = inputs[i];
2657			if (value === undefined) {
2658				continue;
2659			}
2660			if (context !== undefined && typeof value === 'function') {
2661				value = value(context);
2662			}
2663			if (index !== undefined && helpers_core.isArray(value)) {
2664				value = value[index];
2665			}
2666			if (value !== undefined) {
2667				return value;
2668			}
2669		}
2670	}
2671};
2672
2673var helpers$1 = helpers_core;
2674var easing = helpers_easing;
2675var canvas = helpers_canvas;
2676var options = helpers_options;
2677helpers$1.easing = easing;
2678helpers$1.canvas = canvas;
2679helpers$1.options = options;
2680
2681function interpolate(start, view, model, ease) {
2682	var keys = Object.keys(model);
2683	var i, ilen, key, actual, origin, target, type, c0, c1;
2684
2685	for (i = 0, ilen = keys.length; i < ilen; ++i) {
2686		key = keys[i];
2687
2688		target = model[key];
2689
2690		// if a value is added to the model after pivot() has been called, the view
2691		// doesn't contain it, so let's initialize the view to the target value.
2692		if (!view.hasOwnProperty(key)) {
2693			view[key] = target;
2694		}
2695
2696		actual = view[key];
2697
2698		if (actual === target || key[0] === '_') {
2699			continue;
2700		}
2701
2702		if (!start.hasOwnProperty(key)) {
2703			start[key] = actual;
2704		}
2705
2706		origin = start[key];
2707
2708		type = typeof target;
2709
2710		if (type === typeof origin) {
2711			if (type === 'string') {
2712				c0 = chartjsColor(origin);
2713				if (c0.valid) {
2714					c1 = chartjsColor(target);
2715					if (c1.valid) {
2716						view[key] = c1.mix(c0, ease).rgbString();
2717						continue;
2718					}
2719				}
2720			} else if (helpers$1.isFinite(origin) && helpers$1.isFinite(target)) {
2721				view[key] = origin + (target - origin) * ease;
2722				continue;
2723			}
2724		}
2725
2726		view[key] = target;
2727	}
2728}
2729
2730var Element = function(configuration) {
2731	helpers$1.extend(this, configuration);
2732	this.initialize.apply(this, arguments);
2733};
2734
2735helpers$1.extend(Element.prototype, {
2736
2737	initialize: function() {
2738		this.hidden = false;
2739	},
2740
2741	pivot: function() {
2742		var me = this;
2743		if (!me._view) {
2744			me._view = helpers$1.clone(me._model);
2745		}
2746		me._start = {};
2747		return me;
2748	},
2749
2750	transition: function(ease) {
2751		var me = this;
2752		var model = me._model;
2753		var start = me._start;
2754		var view = me._view;
2755
2756		// No animation -> No Transition
2757		if (!model || ease === 1) {
2758			me._view = model;
2759			me._start = null;
2760			return me;
2761		}
2762
2763		if (!view) {
2764			view = me._view = {};
2765		}
2766
2767		if (!start) {
2768			start = me._start = {};
2769		}
2770
2771		interpolate(start, view, model, ease);
2772
2773		return me;
2774	},
2775
2776	tooltipPosition: function() {
2777		return {
2778			x: this._model.x,
2779			y: this._model.y
2780		};
2781	},
2782
2783	hasValue: function() {
2784		return helpers$1.isNumber(this._model.x) && helpers$1.isNumber(this._model.y);
2785	}
2786});
2787
2788Element.extend = helpers$1.inherits;
2789
2790var core_element = Element;
2791
2792var exports$2 = core_element.extend({
2793	chart: null, // the animation associated chart instance
2794	currentStep: 0, // the current animation step
2795	numSteps: 60, // default number of steps
2796	easing: '', // the easing to use for this animation
2797	render: null, // render function used by the animation service
2798
2799	onAnimationProgress: null, // user specified callback to fire on each step of the animation
2800	onAnimationComplete: null, // user specified callback to fire when the animation finishes
2801});
2802
2803var core_animation = exports$2;
2804
2805// DEPRECATIONS
2806
2807/**
2808 * Provided for backward compatibility, use Chart.Animation instead
2809 * @prop Chart.Animation#animationObject
2810 * @deprecated since version 2.6.0
2811 * @todo remove at version 3
2812 */
2813Object.defineProperty(exports$2.prototype, 'animationObject', {
2814	get: function() {
2815		return this;
2816	}
2817});
2818
2819/**
2820 * Provided for backward compatibility, use Chart.Animation#chart instead
2821 * @prop Chart.Animation#chartInstance
2822 * @deprecated since version 2.6.0
2823 * @todo remove at version 3
2824 */
2825Object.defineProperty(exports$2.prototype, 'chartInstance', {
2826	get: function() {
2827		return this.chart;
2828	},
2829	set: function(value) {
2830		this.chart = value;
2831	}
2832});
2833
2834core_defaults._set('global', {
2835	animation: {
2836		duration: 1000,
2837		easing: 'easeOutQuart',
2838		onProgress: helpers$1.noop,
2839		onComplete: helpers$1.noop
2840	}
2841});
2842
2843var core_animations = {
2844	animations: [],
2845	request: null,
2846
2847	/**
2848	 * @param {Chart} chart - The chart to animate.
2849	 * @param {Chart.Animation} animation - The animation that we will animate.
2850	 * @param {Number} duration - The animation duration in ms.
2851	 * @param {Boolean} lazy - if true, the chart is not marked as animating to enable more responsive interactions
2852	 */
2853	addAnimation: function(chart, animation, duration, lazy) {
2854		var animations = this.animations;
2855		var i, ilen;
2856
2857		animation.chart = chart;
2858		animation.startTime = Date.now();
2859		animation.duration = duration;
2860
2861		if (!lazy) {
2862			chart.animating = true;
2863		}
2864
2865		for (i = 0, ilen = animations.length; i < ilen; ++i) {
2866			if (animations[i].chart === chart) {
2867				animations[i] = animation;
2868				return;
2869			}
2870		}
2871
2872		animations.push(animation);
2873
2874		// If there are no animations queued, manually kickstart a digest, for lack of a better word
2875		if (animations.length === 1) {
2876			this.requestAnimationFrame();
2877		}
2878	},
2879
2880	cancelAnimation: function(chart) {
2881		var index = helpers$1.findIndex(this.animations, function(animation) {
2882			return animation.chart === chart;
2883		});
2884
2885		if (index !== -1) {
2886			this.animations.splice(index, 1);
2887			chart.animating = false;
2888		}
2889	},
2890
2891	requestAnimationFrame: function() {
2892		var me = this;
2893		if (me.request === null) {
2894			// Skip animation frame requests until the active one is executed.
2895			// This can happen when processing mouse events, e.g. 'mousemove'
2896			// and 'mouseout' events will trigger multiple renders.
2897			me.request = helpers$1.requestAnimFrame.call(window, function() {
2898				me.request = null;
2899				me.startDigest();
2900			});
2901		}
2902	},
2903
2904	/**
2905	 * @private
2906	 */
2907	startDigest: function() {
2908		var me = this;
2909
2910		me.advance();
2911
2912		// Do we have more stuff to animate?
2913		if (me.animations.length > 0) {
2914			me.requestAnimationFrame();
2915		}
2916	},
2917
2918	/**
2919	 * @private
2920	 */
2921	advance: function() {
2922		var animations = this.animations;
2923		var animation, chart;
2924		var i = 0;
2925
2926		while (i < animations.length) {
2927			animation = animations[i];
2928			chart = animation.chart;
2929
2930			animation.currentStep = Math.floor((Date.now() - animation.startTime) / animation.duration * animation.numSteps);
2931			animation.currentStep = Math.min(animation.currentStep, animation.numSteps);
2932
2933			helpers$1.callback(animation.render, [chart, animation], chart);
2934			helpers$1.callback(animation.onAnimationProgress, [animation], chart);
2935
2936			if (animation.currentStep >= animation.numSteps) {
2937				helpers$1.callback(animation.onAnimationComplete, [animation], chart);
2938				chart.animating = false;
2939				animations.splice(i, 1);
2940			} else {
2941				++i;
2942			}
2943		}
2944	}
2945};
2946
2947var resolve = helpers$1.options.resolve;
2948
2949var arrayEvents = ['push', 'pop', 'shift', 'splice', 'unshift'];
2950
2951/**
2952 * Hooks the array methods that add or remove values ('push', pop', 'shift', 'splice',
2953 * 'unshift') and notify the listener AFTER the array has been altered. Listeners are
2954 * called on the 'onData*' callbacks (e.g. onDataPush, etc.) with same arguments.
2955 */
2956function listenArrayEvents(array, listener) {
2957	if (array._chartjs) {
2958		array._chartjs.listeners.push(listener);
2959		return;
2960	}
2961
2962	Object.defineProperty(array, '_chartjs', {
2963		configurable: true,
2964		enumerable: false,
2965		value: {
2966			listeners: [listener]
2967		}
2968	});
2969
2970	arrayEvents.forEach(function(key) {
2971		var method = 'onData' + key.charAt(0).toUpperCase() + key.slice(1);
2972		var base = array[key];
2973
2974		Object.defineProperty(array, key, {
2975			configurable: true,
2976			enumerable: false,
2977			value: function() {
2978				var args = Array.prototype.slice.call(arguments);
2979				var res = base.apply(this, args);
2980
2981				helpers$1.each(array._chartjs.listeners, function(object) {
2982					if (typeof object[method] === 'function') {
2983						object[method].apply(object, args);
2984					}
2985				});
2986
2987				return res;
2988			}
2989		});
2990	});
2991}
2992
2993/**
2994 * Removes the given array event listener and cleanup extra attached properties (such as
2995 * the _chartjs stub and overridden methods) if array doesn't have any more listeners.
2996 */
2997function unlistenArrayEvents(array, listener) {
2998	var stub = array._chartjs;
2999	if (!stub) {
3000		return;
3001	}
3002
3003	var listeners = stub.listeners;
3004	var index = listeners.indexOf(listener);
3005	if (index !== -1) {
3006		listeners.splice(index, 1);
3007	}
3008
3009	if (listeners.length > 0) {
3010		return;
3011	}
3012
3013	arrayEvents.forEach(function(key) {
3014		delete array[key];
3015	});
3016
3017	delete array._chartjs;
3018}
3019
3020// Base class for all dataset controllers (line, bar, etc)
3021var DatasetController = function(chart, datasetIndex) {
3022	this.initialize(chart, datasetIndex);
3023};
3024
3025helpers$1.extend(DatasetController.prototype, {
3026
3027	/**
3028	 * Element type used to generate a meta dataset (e.g. Chart.element.Line).
3029	 * @type {Chart.core.element}
3030	 */
3031	datasetElementType: null,
3032
3033	/**
3034	 * Element type used to generate a meta data (e.g. Chart.element.Point).
3035	 * @type {Chart.core.element}
3036	 */
3037	dataElementType: null,
3038
3039	initialize: function(chart, datasetIndex) {
3040		var me = this;
3041		me.chart = chart;
3042		me.index = datasetIndex;
3043		me.linkScales();
3044		me.addElements();
3045	},
3046
3047	updateIndex: function(datasetIndex) {
3048		this.index = datasetIndex;
3049	},
3050
3051	linkScales: function() {
3052		var me = this;
3053		var meta = me.getMeta();
3054		var dataset = me.getDataset();
3055
3056		if (meta.xAxisID === null || !(meta.xAxisID in me.chart.scales)) {
3057			meta.xAxisID = dataset.xAxisID || me.chart.options.scales.xAxes[0].id;
3058		}
3059		if (meta.yAxisID === null || !(meta.yAxisID in me.chart.scales)) {
3060			meta.yAxisID = dataset.yAxisID || me.chart.options.scales.yAxes[0].id;
3061		}
3062	},
3063
3064	getDataset: function() {
3065		return this.chart.data.datasets[this.index];
3066	},
3067
3068	getMeta: function() {
3069		return this.chart.getDatasetMeta(this.index);
3070	},
3071
3072	getScaleForId: function(scaleID) {
3073		return this.chart.scales[scaleID];
3074	},
3075
3076	reset: function() {
3077		this.update(true);
3078	},
3079
3080	/**
3081	 * @private
3082	 */
3083	destroy: function() {
3084		if (this._data) {
3085			unlistenArrayEvents(this._data, this);
3086		}
3087	},
3088
3089	createMetaDataset: function() {
3090		var me = this;
3091		var type = me.datasetElementType;
3092		return type && new type({
3093			_chart: me.chart,
3094			_datasetIndex: me.index
3095		});
3096	},
3097
3098	createMetaData: function(index) {
3099		var me = this;
3100		var type = me.dataElementType;
3101		return type && new type({
3102			_chart: me.chart,
3103			_datasetIndex: me.index,
3104			_index: index
3105		});
3106	},
3107
3108	addElements: function() {
3109		var me = this;
3110		var meta = me.getMeta();
3111		var data = me.getDataset().data || [];
3112		var metaData = meta.data;
3113		var i, ilen;
3114
3115		for (i = 0, ilen = data.length; i < ilen; ++i) {
3116			metaData[i] = metaData[i] || me.createMetaData(i);
3117		}
3118
3119		meta.dataset = meta.dataset || me.createMetaDataset();
3120	},
3121
3122	addElementAndReset: function(index) {
3123		var element = this.createMetaData(index);
3124		this.getMeta().data.splice(index, 0, element);
3125		this.updateElement(element, index, true);
3126	},
3127
3128	buildOrUpdateElements: function() {
3129		var me = this;
3130		var dataset = me.getDataset();
3131		var data = dataset.data || (dataset.data = []);
3132
3133		// In order to correctly handle data addition/deletion animation (an thus simulate
3134		// real-time charts), we need to monitor these data modifications and synchronize
3135		// the internal meta data accordingly.
3136		if (me._data !== data) {
3137			if (me._data) {
3138				// This case happens when the user replaced the data array instance.
3139				unlistenArrayEvents(me._data, me);
3140			}
3141
3142			listenArrayEvents(data, me);
3143			me._data = data;
3144		}
3145
3146		// Re-sync meta data in case the user replaced the data array or if we missed
3147		// any updates and so make sure that we handle number of datapoints changing.
3148		me.resyncElements();
3149	},
3150
3151	update: helpers$1.noop,
3152
3153	transition: function(easingValue) {
3154		var meta = this.getMeta();
3155		var elements = meta.data || [];
3156		var ilen = elements.length;
3157		var i = 0;
3158
3159		for (; i < ilen; ++i) {
3160			elements[i].transition(easingValue);
3161		}
3162
3163		if (meta.dataset) {
3164			meta.dataset.transition(easingValue);
3165		}
3166	},
3167
3168	draw: function() {
3169		var meta = this.getMeta();
3170		var elements = meta.data || [];
3171		var ilen = elements.length;
3172		var i = 0;
3173
3174		if (meta.dataset) {
3175			meta.dataset.draw();
3176		}
3177
3178		for (; i < ilen; ++i) {
3179			elements[i].draw();
3180		}
3181	},
3182
3183	removeHoverStyle: function(element) {
3184		helpers$1.merge(element._model, element.$previousStyle || {});
3185		delete element.$previousStyle;
3186	},
3187
3188	setHoverStyle: function(element) {
3189		var dataset = this.chart.data.datasets[element._datasetIndex];
3190		var index = element._index;
3191		var custom = element.custom || {};
3192		var model = element._model;
3193		var getHoverColor = helpers$1.getHoverColor;
3194
3195		element.$previousStyle = {
3196			backgroundColor: model.backgroundColor,
3197			borderColor: model.borderColor,
3198			borderWidth: model.borderWidth
3199		};
3200
3201		model.backgroundColor = resolve([custom.hoverBackgroundColor, dataset.hoverBackgroundColor, getHoverColor(model.backgroundColor)], undefined, index);
3202		model.borderColor = resolve([custom.hoverBorderColor, dataset.hoverBorderColor, getHoverColor(model.borderColor)], undefined, index);
3203		model.borderWidth = resolve([custom.hoverBorderWidth, dataset.hoverBorderWidth, model.borderWidth], undefined, index);
3204	},
3205
3206	/**
3207	 * @private
3208	 */
3209	resyncElements: function() {
3210		var me = this;
3211		var meta = me.getMeta();
3212		var data = me.getDataset().data;
3213		var numMeta = meta.data.length;
3214		var numData = data.length;
3215
3216		if (numData < numMeta) {
3217			meta.data.splice(numData, numMeta - numData);
3218		} else if (numData > numMeta) {
3219			me.insertElements(numMeta, numData - numMeta);
3220		}
3221	},
3222
3223	/**
3224	 * @private
3225	 */
3226	insertElements: function(start, count) {
3227		for (var i = 0; i < count; ++i) {
3228			this.addElementAndReset(start + i);
3229		}
3230	},
3231
3232	/**
3233	 * @private
3234	 */
3235	onDataPush: function() {
3236		this.insertElements(this.getDataset().data.length - 1, arguments.length);
3237	},
3238
3239	/**
3240	 * @private
3241	 */
3242	onDataPop: function() {
3243		this.getMeta().data.pop();
3244	},
3245
3246	/**
3247	 * @private
3248	 */
3249	onDataShift: function() {
3250		this.getMeta().data.shift();
3251	},
3252
3253	/**
3254	 * @private
3255	 */
3256	onDataSplice: function(start, count) {
3257		this.getMeta().data.splice(start, count);
3258		this.insertElements(start, arguments.length - 2);
3259	},
3260
3261	/**
3262	 * @private
3263	 */
3264	onDataUnshift: function() {
3265		this.insertElements(0, arguments.length);
3266	}
3267});
3268
3269DatasetController.extend = helpers$1.inherits;
3270
3271var core_datasetController = DatasetController;
3272
3273core_defaults._set('global', {
3274	elements: {
3275		arc: {
3276			backgroundColor: core_defaults.global.defaultColor,
3277			borderColor: '#fff',
3278			borderWidth: 2,
3279			borderAlign: 'center'
3280		}
3281	}
3282});
3283
3284var element_arc = core_element.extend({
3285	inLabelRange: function(mouseX) {
3286		var vm = this._view;
3287
3288		if (vm) {
3289			return (Math.pow(mouseX - vm.x, 2) < Math.pow(vm.radius + vm.hoverRadius, 2));
3290		}
3291		return false;
3292	},
3293
3294	inRange: function(chartX, chartY) {
3295		var vm = this._view;
3296
3297		if (vm) {
3298			var pointRelativePosition = helpers$1.getAngleFromPoint(vm, {x: chartX, y: chartY});
3299			var	angle = pointRelativePosition.angle;
3300			var distance = pointRelativePosition.distance;
3301
3302			// Sanitise angle range
3303			var startAngle = vm.startAngle;
3304			var endAngle = vm.endAngle;
3305			while (endAngle < startAngle) {
3306				endAngle += 2.0 * Math.PI;
3307			}
3308			while (angle > endAngle) {
3309				angle -= 2.0 * Math.PI;
3310			}
3311			while (angle < startAngle) {
3312				angle += 2.0 * Math.PI;
3313			}
3314
3315			// Check if within the range of the open/close angle
3316			var betweenAngles = (angle >= startAngle && angle <= endAngle);
3317			var withinRadius = (distance >= vm.innerRadius && distance <= vm.outerRadius);
3318
3319			return (betweenAngles && withinRadius);
3320		}
3321		return false;
3322	},
3323
3324	getCenterPoint: function() {
3325		var vm = this._view;
3326		var halfAngle = (vm.startAngle + vm.endAngle) / 2;
3327		var halfRadius = (vm.innerRadius + vm.outerRadius) / 2;
3328		return {
3329			x: vm.x + Math.cos(halfAngle) * halfRadius,
3330			y: vm.y + Math.sin(halfAngle) * halfRadius
3331		};
3332	},
3333
3334	getArea: function() {
3335		var vm = this._view;
3336		return Math.PI * ((vm.endAngle - vm.startAngle) / (2 * Math.PI)) * (Math.pow(vm.outerRadius, 2) - Math.pow(vm.innerRadius, 2));
3337	},
3338
3339	tooltipPosition: function() {
3340		var vm = this._view;
3341		var centreAngle = vm.startAngle + ((vm.endAngle - vm.startAngle) / 2);
3342		var rangeFromCentre = (vm.outerRadius - vm.innerRadius) / 2 + vm.innerRadius;
3343
3344		return {
3345			x: vm.x + (Math.cos(centreAngle) * rangeFromCentre),
3346			y: vm.y + (Math.sin(centreAngle) * rangeFromCentre)
3347		};
3348	},
3349
3350	draw: function() {
3351		var ctx = this._chart.ctx;
3352		var vm = this._view;
3353		var sA = vm.startAngle;
3354		var eA = vm.endAngle;
3355		var pixelMargin = (vm.borderAlign === 'inner') ? 0.33 : 0;
3356		var angleMargin;
3357
3358		ctx.save();
3359
3360		ctx.beginPath();
3361		ctx.arc(vm.x, vm.y, Math.max(vm.outerRadius - pixelMargin, 0), sA, eA);
3362		ctx.arc(vm.x, vm.y, vm.innerRadius, eA, sA, true);
3363		ctx.closePath();
3364
3365		ctx.fillStyle = vm.backgroundColor;
3366		ctx.fill();
3367
3368		if (vm.borderWidth) {
3369			if (vm.borderAlign === 'inner') {
3370				// Draw an inner border by cliping the arc and drawing a double-width border
3371				// Enlarge the clipping arc by 0.33 pixels to eliminate glitches between borders
3372				ctx.beginPath();
3373				angleMargin = pixelMargin / vm.outerRadius;
3374				ctx.arc(vm.x, vm.y, vm.outerRadius, sA - angleMargin, eA + angleMargin);
3375				if (vm.innerRadius > pixelMargin) {
3376					angleMargin = pixelMargin / vm.innerRadius;
3377					ctx.arc(vm.x, vm.y, vm.innerRadius - pixelMargin, eA + angleMargin, sA - angleMargin, true);
3378				} else {
3379					ctx.arc(vm.x, vm.y, pixelMargin, eA + Math.PI / 2, sA - Math.PI / 2);
3380				}
3381				ctx.closePath();
3382				ctx.clip();
3383
3384				ctx.beginPath();
3385				ctx.arc(vm.x, vm.y, vm.outerRadius, sA, eA);
3386				ctx.arc(vm.x, vm.y, vm.innerRadius, eA, sA, true);
3387				ctx.closePath();
3388
3389				ctx.lineWidth = vm.borderWidth * 2;
3390				ctx.lineJoin = 'round';
3391			} else {
3392				ctx.lineWidth = vm.borderWidth;
3393				ctx.lineJoin = 'bevel';
3394			}
3395
3396			ctx.strokeStyle = vm.borderColor;
3397			ctx.stroke();
3398		}
3399
3400		ctx.restore();
3401	}
3402});
3403
3404var valueOrDefault$1 = helpers$1.valueOrDefault;
3405
3406var defaultColor = core_defaults.global.defaultColor;
3407
3408core_defaults._set('global', {
3409	elements: {
3410		line: {
3411			tension: 0.4,
3412			backgroundColor: defaultColor,
3413			borderWidth: 3,
3414			borderColor: defaultColor,
3415			borderCapStyle: 'butt',
3416			borderDash: [],
3417			borderDashOffset: 0.0,
3418			borderJoinStyle: 'miter',
3419			capBezierPoints: true,
3420			fill: true, // do we fill in the area between the line and its base axis
3421		}
3422	}
3423});
3424
3425var element_line = core_element.extend({
3426	draw: function() {
3427		var me = this;
3428		var vm = me._view;
3429		var ctx = me._chart.ctx;
3430		var spanGaps = vm.spanGaps;
3431		var points = me._children.slice(); // clone array
3432		var globalDefaults = core_defaults.global;
3433		var globalOptionLineElements = globalDefaults.elements.line;
3434		var lastDrawnIndex = -1;
3435		var index, current, previous, currentVM;
3436
3437		// If we are looping, adding the first point again
3438		if (me._loop && points.length) {
3439			points.push(points[0]);
3440		}
3441
3442		ctx.save();
3443
3444		// Stroke Line Options
3445		ctx.lineCap = vm.borderCapStyle || globalOptionLineElements.borderCapStyle;
3446
3447		// IE 9 and 10 do not support line dash
3448		if (ctx.setLineDash) {
3449			ctx.setLineDash(vm.borderDash || globalOptionLineElements.borderDash);
3450		}
3451
3452		ctx.lineDashOffset = valueOrDefault$1(vm.borderDashOffset, globalOptionLineElements.borderDashOffset);
3453		ctx.lineJoin = vm.borderJoinStyle || globalOptionLineElements.borderJoinStyle;
3454		ctx.lineWidth = valueOrDefault$1(vm.borderWidth, globalOptionLineElements.borderWidth);
3455		ctx.strokeStyle = vm.borderColor || globalDefaults.defaultColor;
3456
3457		// Stroke Line
3458		ctx.beginPath();
3459		lastDrawnIndex = -1;
3460
3461		for (index = 0; index < points.length; ++index) {
3462			current = points[index];
3463			previous = helpers$1.previousItem(points, index);
3464			currentVM = current._view;
3465
3466			// First point moves to it's starting position no matter what
3467			if (index === 0) {
3468				if (!currentVM.skip) {
3469					ctx.moveTo(currentVM.x, currentVM.y);
3470					lastDrawnIndex = index;
3471				}
3472			} else {
3473				previous = lastDrawnIndex === -1 ? previous : points[lastDrawnIndex];
3474
3475				if (!currentVM.skip) {
3476					if ((lastDrawnIndex !== (index - 1) && !spanGaps) || lastDrawnIndex === -1) {
3477						// There was a gap and this is the first point after the gap
3478						ctx.moveTo(currentVM.x, currentVM.y);
3479					} else {
3480						// Line to next point
3481						helpers$1.canvas.lineTo(ctx, previous._view, current._view);
3482					}
3483					lastDrawnIndex = index;
3484				}
3485			}
3486		}
3487
3488		ctx.stroke();
3489		ctx.restore();
3490	}
3491});
3492
3493var valueOrDefault$2 = helpers$1.valueOrDefault;
3494
3495var defaultColor$1 = core_defaults.global.defaultColor;
3496
3497core_defaults._set('global', {
3498	elements: {
3499		point: {
3500			radius: 3,
3501			pointStyle: 'circle',
3502			backgroundColor: defaultColor$1,
3503			borderColor: defaultColor$1,
3504			borderWidth: 1,
3505			// Hover
3506			hitRadius: 1,
3507			hoverRadius: 4,
3508			hoverBorderWidth: 1
3509		}
3510	}
3511});
3512
3513function xRange(mouseX) {
3514	var vm = this._view;
3515	return vm ? (Math.abs(mouseX - vm.x) < vm.radius + vm.hitRadius) : false;
3516}
3517
3518function yRange(mouseY) {
3519	var vm = this._view;
3520	return vm ? (Math.abs(mouseY - vm.y) < vm.radius + vm.hitRadius) : false;
3521}
3522
3523var element_point = core_element.extend({
3524	inRange: function(mouseX, mouseY) {
3525		var vm = this._view;
3526		return vm ? ((Math.pow(mouseX - vm.x, 2) + Math.pow(mouseY - vm.y, 2)) < Math.pow(vm.hitRadius + vm.radius, 2)) : false;
3527	},
3528
3529	inLabelRange: xRange,
3530	inXRange: xRange,
3531	inYRange: yRange,
3532
3533	getCenterPoint: function() {
3534		var vm = this._view;
3535		return {
3536			x: vm.x,
3537			y: vm.y
3538		};
3539	},
3540
3541	getArea: function() {
3542		return Math.PI * Math.pow(this._view.radius, 2);
3543	},
3544
3545	tooltipPosition: function() {
3546		var vm = this._view;
3547		return {
3548			x: vm.x,
3549			y: vm.y,
3550			padding: vm.radius + vm.borderWidth
3551		};
3552	},
3553
3554	draw: function(chartArea) {
3555		var vm = this._view;
3556		var ctx = this._chart.ctx;
3557		var pointStyle = vm.pointStyle;
3558		var rotation = vm.rotation;
3559		var radius = vm.radius;
3560		var x = vm.x;
3561		var y = vm.y;
3562		var globalDefaults = core_defaults.global;
3563		var defaultColor = globalDefaults.defaultColor; // eslint-disable-line no-shadow
3564
3565		if (vm.skip) {
3566			return;
3567		}
3568
3569		// Clipping for Points.
3570		if (chartArea === undefined || helpers$1.canvas._isPointInArea(vm, chartArea)) {
3571			ctx.strokeStyle = vm.borderColor || defaultColor;
3572			ctx.lineWidth = valueOrDefault$2(vm.borderWidth, globalDefaults.elements.point.borderWidth);
3573			ctx.fillStyle = vm.backgroundColor || defaultColor;
3574			helpers$1.canvas.drawPoint(ctx, pointStyle, radius, x, y, rotation);
3575		}
3576	}
3577});
3578
3579var defaultColor$2 = core_defaults.global.defaultColor;
3580
3581core_defaults._set('global', {
3582	elements: {
3583		rectangle: {
3584			backgroundColor: defaultColor$2,
3585			borderColor: defaultColor$2,
3586			borderSkipped: 'bottom',
3587			borderWidth: 0
3588		}
3589	}
3590});
3591
3592function isVertical(bar) {
3593	return bar._view.width !== undefined;
3594}
3595
3596/**
3597 * Helper function to get the bounds of the bar regardless of the orientation
3598 * @param bar {Chart.Element.Rectangle} the bar
3599 * @return {Bounds} bounds of the bar
3600 * @private
3601 */
3602function getBarBounds(bar) {
3603	var vm = bar._view;
3604	var x1, x2, y1, y2;
3605
3606	if (isVertical(bar)) {
3607		// vertical
3608		var halfWidth = vm.width / 2;
3609		x1 = vm.x - halfWidth;
3610		x2 = vm.x + halfWidth;
3611		y1 = Math.min(vm.y, vm.base);
3612		y2 = Math.max(vm.y, vm.base);
3613	} else {
3614		// horizontal bar
3615		var halfHeight = vm.height / 2;
3616		x1 = Math.min(vm.x, vm.base);
3617		x2 = Math.max(vm.x, vm.base);
3618		y1 = vm.y - halfHeight;
3619		y2 = vm.y + halfHeight;
3620	}
3621
3622	return {
3623		left: x1,
3624		top: y1,
3625		right: x2,
3626		bottom: y2
3627	};
3628}
3629
3630var element_rectangle = core_element.extend({
3631	draw: function() {
3632		var ctx = this._chart.ctx;
3633		var vm = this._view;
3634		var left, right, top, bottom, signX, signY, borderSkipped;
3635		var borderWidth = vm.borderWidth;
3636
3637		if (!vm.horizontal) {
3638			// bar
3639			left = vm.x - vm.width / 2;
3640			right = vm.x + vm.width / 2;
3641			top = vm.y;
3642			bottom = vm.base;
3643			signX = 1;
3644			signY = bottom > top ? 1 : -1;
3645			borderSkipped = vm.borderSkipped || 'bottom';
3646		} else {
3647			// horizontal bar
3648			left = vm.base;
3649			right = vm.x;
3650			top = vm.y - vm.height / 2;
3651			bottom = vm.y + vm.height / 2;
3652			signX = right > left ? 1 : -1;
3653			signY = 1;
3654			borderSkipped = vm.borderSkipped || 'left';
3655		}
3656
3657		// Canvas doesn't allow us to stroke inside the width so we can
3658		// adjust the sizes to fit if we're setting a stroke on the line
3659		if (borderWidth) {
3660			// borderWidth shold be less than bar width and bar height.
3661			var barSize = Math.min(Math.abs(left - right), Math.abs(top - bottom));
3662			borderWidth = borderWidth > barSize ? barSize : borderWidth;
3663			var halfStroke = borderWidth / 2;
3664			// Adjust borderWidth when bar top position is near vm.base(zero).
3665			var borderLeft = left + (borderSkipped !== 'left' ? halfStroke * signX : 0);
3666			var borderRight = right + (borderSkipped !== 'right' ? -halfStroke * signX : 0);
3667			var borderTop = top + (borderSkipped !== 'top' ? halfStroke * signY : 0);
3668			var borderBottom = bottom + (borderSkipped !== 'bottom' ? -halfStroke * signY : 0);
3669			// not become a vertical line?
3670			if (borderLeft !== borderRight) {
3671				top = borderTop;
3672				bottom = borderBottom;
3673			}
3674			// not become a horizontal line?
3675			if (borderTop !== borderBottom) {
3676				left = borderLeft;
3677				right = borderRight;
3678			}
3679		}
3680
3681		ctx.beginPath();
3682		ctx.fillStyle = vm.backgroundColor;
3683		ctx.strokeStyle = vm.borderColor;
3684		ctx.lineWidth = borderWidth;
3685
3686		// Corner points, from bottom-left to bottom-right clockwise
3687		// | 1 2 |
3688		// | 0 3 |
3689		var corners = [
3690			[left, bottom],
3691			[left, top],
3692			[right, top],
3693			[right, bottom]
3694		];
3695
3696		// Find first (starting) corner with fallback to 'bottom'
3697		var borders = ['bottom', 'left', 'top', 'right'];
3698		var startCorner = borders.indexOf(borderSkipped, 0);
3699		if (startCorner === -1) {
3700			startCorner = 0;
3701		}
3702
3703		function cornerAt(index) {
3704			return corners[(startCorner + index) % 4];
3705		}
3706
3707		// Draw rectangle from 'startCorner'
3708		var corner = cornerAt(0);
3709		ctx.moveTo(corner[0], corner[1]);
3710
3711		for (var i = 1; i < 4; i++) {
3712			corner = cornerAt(i);
3713			ctx.lineTo(corner[0], corner[1]);
3714		}
3715
3716		ctx.fill();
3717		if (borderWidth) {
3718			ctx.stroke();
3719		}
3720	},
3721
3722	height: function() {
3723		var vm = this._view;
3724		return vm.base - vm.y;
3725	},
3726
3727	inRange: function(mouseX, mouseY) {
3728		var inRange = false;
3729
3730		if (this._view) {
3731			var bounds = getBarBounds(this);
3732			inRange = mouseX >= bounds.left && mouseX <= bounds.right && mouseY >= bounds.top && mouseY <= bounds.bottom;
3733		}
3734
3735		return inRange;
3736	},
3737
3738	inLabelRange: function(mouseX, mouseY) {
3739		var me = this;
3740		if (!me._view) {
3741			return false;
3742		}
3743
3744		var inRange = false;
3745		var bounds = getBarBounds(me);
3746
3747		if (isVertical(me)) {
3748			inRange = mouseX >= bounds.left && mouseX <= bounds.right;
3749		} else {
3750			inRange = mouseY >= bounds.top && mouseY <= bounds.bottom;
3751		}
3752
3753		return inRange;
3754	},
3755
3756	inXRange: function(mouseX) {
3757		var bounds = getBarBounds(this);
3758		return mouseX >= bounds.left && mouseX <= bounds.right;
3759	},
3760
3761	inYRange: function(mouseY) {
3762		var bounds = getBarBounds(this);
3763		return mouseY >= bounds.top && mouseY <= bounds.bottom;
3764	},
3765
3766	getCenterPoint: function() {
3767		var vm = this._view;
3768		var x, y;
3769		if (isVertical(this)) {
3770			x = vm.x;
3771			y = (vm.y + vm.base) / 2;
3772		} else {
3773			x = (vm.x + vm.base) / 2;
3774			y = vm.y;
3775		}
3776
3777		return {x: x, y: y};
3778	},
3779
3780	getArea: function() {
3781		var vm = this._view;
3782		return vm.width * Math.abs(vm.y - vm.base);
3783	},
3784
3785	tooltipPosition: function() {
3786		var vm = this._view;
3787		return {
3788			x: vm.x,
3789			y: vm.y
3790		};
3791	}
3792});
3793
3794var elements = {};
3795var Arc = element_arc;
3796var Line = element_line;
3797var Point = element_point;
3798var Rectangle = element_rectangle;
3799elements.Arc = Arc;
3800elements.Line = Line;
3801elements.Point = Point;
3802elements.Rectangle = Rectangle;
3803
3804var resolve$1 = helpers$1.options.resolve;
3805
3806core_defaults._set('bar', {
3807	hover: {
3808		mode: 'label'
3809	},
3810
3811	scales: {
3812		xAxes: [{
3813			type: 'category',
3814			categoryPercentage: 0.8,
3815			barPercentage: 0.9,
3816			offset: true,
3817			gridLines: {
3818				offsetGridLines: true
3819			}
3820		}],
3821
3822		yAxes: [{
3823			type: 'linear'
3824		}]
3825	}
3826});
3827
3828/**
3829 * Computes the "optimal" sample size to maintain bars equally sized while preventing overlap.
3830 * @private
3831 */
3832function computeMinSampleSize(scale, pixels) {
3833	var min = scale.isHorizontal() ? scale.width : scale.height;
3834	var ticks = scale.getTicks();
3835	var prev, curr, i, ilen;
3836
3837	for (i = 1, ilen = pixels.length; i < ilen; ++i) {
3838		min = Math.min(min, Math.abs(pixels[i] - pixels[i - 1]));
3839	}
3840
3841	for (i = 0, ilen = ticks.length; i < ilen; ++i) {
3842		curr = scale.getPixelForTick(i);
3843		min = i > 0 ? Math.min(min, curr - prev) : min;
3844		prev = curr;
3845	}
3846
3847	return min;
3848}
3849
3850/**
3851 * Computes an "ideal" category based on the absolute bar thickness or, if undefined or null,
3852 * uses the smallest interval (see computeMinSampleSize) that prevents bar overlapping. This
3853 * mode currently always generates bars equally sized (until we introduce scriptable options?).
3854 * @private
3855 */
3856function computeFitCategoryTraits(index, ruler, options) {
3857	var thickness = options.barThickness;
3858	var count = ruler.stackCount;
3859	var curr = ruler.pixels[index];
3860	var size, ratio;
3861
3862	if (helpers$1.isNullOrUndef(thickness)) {
3863		size = ruler.min * options.categoryPercentage;
3864		ratio = options.barPercentage;
3865	} else {
3866		// When bar thickness is enforced, category and bar percentages are ignored.
3867		// Note(SB): we could add support for relative bar thickness (e.g. barThickness: '50%')
3868		// and deprecate barPercentage since this value is ignored when thickness is absolute.
3869		size = thickness * count;
3870		ratio = 1;
3871	}
3872
3873	return {
3874		chunk: size / count,
3875		ratio: ratio,
3876		start: curr - (size / 2)
3877	};
3878}
3879
3880/**
3881 * Computes an "optimal" category that globally arranges bars side by side (no gap when
3882 * percentage options are 1), based on the previous and following categories. This mode
3883 * generates bars with different widths when data are not evenly spaced.
3884 * @private
3885 */
3886function computeFlexCategoryTraits(index, ruler, options) {
3887	var pixels = ruler.pixels;
3888	var curr = pixels[index];
3889	var prev = index > 0 ? pixels[index - 1] : null;
3890	var next = index < pixels.length - 1 ? pixels[index + 1] : null;
3891	var percent = options.categoryPercentage;
3892	var start, size;
3893
3894	if (prev === null) {
3895		// first data: its size is double based on the next point or,
3896		// if it's also the last data, we use the scale size.
3897		prev = curr - (next === null ? ruler.end - ruler.start : next - curr);
3898	}
3899
3900	if (next === null) {
3901		// last data: its size is also double based on the previous point.
3902		next = curr + curr - prev;
3903	}
3904
3905	start = curr - (curr - Math.min(prev, next)) / 2 * percent;
3906	size = Math.abs(next - prev) / 2 * percent;
3907
3908	return {
3909		chunk: size / ruler.stackCount,
3910		ratio: options.barPercentage,
3911		start: start
3912	};
3913}
3914
3915var controller_bar = core_datasetController.extend({
3916
3917	dataElementType: elements.Rectangle,
3918
3919	initialize: function() {
3920		var me = this;
3921		var meta;
3922
3923		core_datasetController.prototype.initialize.apply(me, arguments);
3924
3925		meta = me.getMeta();
3926		meta.stack = me.getDataset().stack;
3927		meta.bar = true;
3928	},
3929
3930	update: function(reset) {
3931		var me = this;
3932		var rects = me.getMeta().data;
3933		var i, ilen;
3934
3935		me._ruler = me.getRuler();
3936
3937		for (i = 0, ilen = rects.length; i < ilen; ++i) {
3938			me.updateElement(rects[i], i, reset);
3939		}
3940	},
3941
3942	updateElement: function(rectangle, index, reset) {
3943		var me = this;
3944		var meta = me.getMeta();
3945		var dataset = me.getDataset();
3946		var options = me._resolveElementOptions(rectangle, index);
3947
3948		rectangle._xScale = me.getScaleForId(meta.xAxisID);
3949		rectangle._yScale = me.getScaleForId(meta.yAxisID);
3950		rectangle._datasetIndex = me.index;
3951		rectangle._index = index;
3952		rectangle._model = {
3953			backgroundColor: options.backgroundColor,
3954			borderColor: options.borderColor,
3955			borderSkipped: options.borderSkipped,
3956			borderWidth: options.borderWidth,
3957			datasetLabel: dataset.label,
3958			label: me.chart.data.labels[index]
3959		};
3960
3961		me._updateElementGeometry(rectangle, index, reset);
3962
3963		rectangle.pivot();
3964	},
3965
3966	/**
3967	 * @private
3968	 */
3969	_updateElementGeometry: function(rectangle, index, reset) {
3970		var me = this;
3971		var model = rectangle._model;
3972		var vscale = me.getValueScale();
3973		var base = vscale.getBasePixel();
3974		var horizontal = vscale.isHorizontal();
3975		var ruler = me._ruler || me.getRuler();
3976		var vpixels = me.calculateBarValuePixels(me.index, index);
3977		var ipixels = me.calculateBarIndexPixels(me.index, index, ruler);
3978
3979		model.horizontal = horizontal;
3980		model.base = reset ? base : vpixels.base;
3981		model.x = horizontal ? reset ? base : vpixels.head : ipixels.center;
3982		model.y = horizontal ? ipixels.center : reset ? base : vpixels.head;
3983		model.height = horizontal ? ipixels.size : undefined;
3984		model.width = horizontal ? undefined : ipixels.size;
3985	},
3986
3987	/**
3988	 * @private
3989	 */
3990	getValueScaleId: function() {
3991		return this.getMeta().yAxisID;
3992	},
3993
3994	/**
3995	 * @private
3996	 */
3997	getIndexScaleId: function() {
3998		return this.getMeta().xAxisID;
3999	},
4000
4001	/**
4002	 * @private
4003	 */
4004	getValueScale: function() {
4005		return this.getScaleForId(this.getValueScaleId());
4006	},
4007
4008	/**
4009	 * @private
4010	 */
4011	getIndexScale: function() {
4012		return this.getScaleForId(this.getIndexScaleId());
4013	},
4014
4015	/**
4016	 * Returns the stacks based on groups and bar visibility.
4017	 * @param {Number} [last] - The dataset index
4018	 * @returns {Array} The stack list
4019	 * @private
4020	 */
4021	_getStacks: function(last) {
4022		var me = this;
4023		var chart = me.chart;
4024		var scale = me.getIndexScale();
4025		var stacked = scale.options.stacked;
4026		var ilen = last === undefined ? chart.data.datasets.length : last + 1;
4027		var stacks = [];
4028		var i, meta;
4029
4030		for (i = 0; i < ilen; ++i) {
4031			meta = chart.getDatasetMeta(i);
4032			if (meta.bar && chart.isDatasetVisible(i) &&
4033				(stacked === false ||
4034				(stacked === true && stacks.indexOf(meta.stack) === -1) ||
4035				(stacked === undefined && (meta.stack === undefined || stacks.indexOf(meta.stack) === -1)))) {
4036				stacks.push(meta.stack);
4037			}
4038		}
4039
4040		return stacks;
4041	},
4042
4043	/**
4044	 * Returns the effective number of stacks based on groups and bar visibility.
4045	 * @private
4046	 */
4047	getStackCount: function() {
4048		return this._getStacks().length;
4049	},
4050
4051	/**
4052	 * Returns the stack index for the given dataset based on groups and bar visibility.
4053	 * @param {Number} [datasetIndex] - The dataset index
4054	 * @param {String} [name] - The stack name to find
4055	 * @returns {Number} The stack index
4056	 * @private
4057	 */
4058	getStackIndex: function(datasetIndex, name) {
4059		var stacks = this._getStacks(datasetIndex);
4060		var index = (name !== undefined)
4061			? stacks.indexOf(name)
4062			: -1; // indexOf returns -1 if element is not present
4063
4064		return (index === -1)
4065			? stacks.length - 1
4066			: index;
4067	},
4068
4069	/**
4070	 * @private
4071	 */
4072	getRuler: function() {
4073		var me = this;
4074		var scale = me.getIndexScale();
4075		var stackCount = me.getStackCount();
4076		var datasetIndex = me.index;
4077		var isHorizontal = scale.isHorizontal();
4078		var start = isHorizontal ? scale.left : scale.top;
4079		var end = start + (isHorizontal ? scale.width : scale.height);
4080		var pixels = [];
4081		var i, ilen, min;
4082
4083		for (i = 0, ilen = me.getMeta().data.length; i < ilen; ++i) {
4084			pixels.push(scale.getPixelForValue(null, i, datasetIndex));
4085		}
4086
4087		min = helpers$1.isNullOrUndef(scale.options.barThickness)
4088			? computeMinSampleSize(scale, pixels)
4089			: -1;
4090
4091		return {
4092			min: min,
4093			pixels: pixels,
4094			start: start,
4095			end: end,
4096			stackCount: stackCount,
4097			scale: scale
4098		};
4099	},
4100
4101	/**
4102	 * Note: pixel values are not clamped to the scale area.
4103	 * @private
4104	 */
4105	calculateBarValuePixels: function(datasetIndex, index) {
4106		var me = this;
4107		var chart = me.chart;
4108		var meta = me.getMeta();
4109		var scale = me.getValueScale();
4110		var isHorizontal = scale.isHorizontal();
4111		var datasets = chart.data.datasets;
4112		var value = +scale.getRightValue(datasets[datasetIndex].data[index]);
4113		var minBarLength = scale.options.minBarLength;
4114		var stacked = scale.options.stacked;
4115		var stack = meta.stack;
4116		var start = 0;
4117		var i, imeta, ivalue, base, head, size;
4118
4119		if (stacked || (stacked === undefined && stack !== undefined)) {
4120			for (i = 0; i < datasetIndex; ++i) {
4121				imeta = chart.getDatasetMeta(i);
4122
4123				if (imeta.bar &&
4124					imeta.stack === stack &&
4125					imeta.controller.getValueScaleId() === scale.id &&
4126					chart.isDatasetVisible(i)) {
4127
4128					ivalue = +scale.getRightValue(datasets[i].data[index]);
4129					if ((value < 0 && ivalue < 0) || (value >= 0 && ivalue > 0)) {
4130						start += ivalue;
4131					}
4132				}
4133			}
4134		}
4135
4136		base = scale.getPixelForValue(start);
4137		head = scale.getPixelForValue(start + value);
4138		size = head - base;
4139
4140		if (minBarLength !== undefined && Math.abs(size) < minBarLength) {
4141			size = minBarLength;
4142			if (value >= 0 && !isHorizontal || value < 0 && isHorizontal) {
4143				head = base - minBarLength;
4144			} else {
4145				head = base + minBarLength;
4146			}
4147		}
4148
4149		return {
4150			size: size,
4151			base: base,
4152			head: head,
4153			center: head + size / 2
4154		};
4155	},
4156
4157	/**
4158	 * @private
4159	 */
4160	calculateBarIndexPixels: function(datasetIndex, index, ruler) {
4161		var me = this;
4162		var options = ruler.scale.options;
4163		var range = options.barThickness === 'flex'
4164			? computeFlexCategoryTraits(index, ruler, options)
4165			: computeFitCategoryTraits(index, ruler, options);
4166
4167		var stackIndex = me.getStackIndex(datasetIndex, me.getMeta().stack);
4168		var center = range.start + (range.chunk * stackIndex) + (range.chunk / 2);
4169		var size = Math.min(
4170			helpers$1.valueOrDefault(options.maxBarThickness, Infinity),
4171			range.chunk * range.ratio);
4172
4173		return {
4174			base: center - size / 2,
4175			head: center + size / 2,
4176			center: center,
4177			size: size
4178		};
4179	},
4180
4181	draw: function() {
4182		var me = this;
4183		var chart = me.chart;
4184		var scale = me.getValueScale();
4185		var rects = me.getMeta().data;
4186		var dataset = me.getDataset();
4187		var ilen = rects.length;
4188		var i = 0;
4189
4190		helpers$1.canvas.clipArea(chart.ctx, chart.chartArea);
4191
4192		for (; i < ilen; ++i) {
4193			if (!isNaN(scale.getRightValue(dataset.data[i]))) {
4194				rects[i].draw();
4195			}
4196		}
4197
4198		helpers$1.canvas.unclipArea(chart.ctx);
4199	},
4200
4201	/**
4202	 * @private
4203	 */
4204	_resolveElementOptions: function(rectangle, index) {
4205		var me = this;
4206		var chart = me.chart;
4207		var datasets = chart.data.datasets;
4208		var dataset = datasets[me.index];
4209		var custom = rectangle.custom || {};
4210		var options = chart.options.elements.rectangle;
4211		var values = {};
4212		var i, ilen, key;
4213
4214		// Scriptable options
4215		var context = {
4216			chart: chart,
4217			dataIndex: index,
4218			dataset: dataset,
4219			datasetIndex: me.index
4220		};
4221
4222		var keys = [
4223			'backgroundColor',
4224			'borderColor',
4225			'borderSkipped',
4226			'borderWidth'
4227		];
4228
4229		for (i = 0, ilen = keys.length; i < ilen; ++i) {
4230			key = keys[i];
4231			values[key] = resolve$1([
4232				custom[key],
4233				dataset[key],
4234				options[key]
4235			], context, index);
4236		}
4237
4238		return values;
4239	}
4240});
4241
4242var valueOrDefault$3 = helpers$1.valueOrDefault;
4243var resolve$2 = helpers$1.options.resolve;
4244
4245core_defaults._set('bubble', {
4246	hover: {
4247		mode: 'single'
4248	},
4249
4250	scales: {
4251		xAxes: [{
4252			type: 'linear', // bubble should probably use a linear scale by default
4253			position: 'bottom',
4254			id: 'x-axis-0' // need an ID so datasets can reference the scale
4255		}],
4256		yAxes: [{
4257			type: 'linear',
4258			position: 'left',
4259			id: 'y-axis-0'
4260		}]
4261	},
4262
4263	tooltips: {
4264		callbacks: {
4265			title: function() {
4266				// Title doesn't make sense for scatter since we format the data as a point
4267				return '';
4268			},
4269			label: function(item, data) {
4270				var datasetLabel = data.datasets[item.datasetIndex].label || '';
4271				var dataPoint = data.datasets[item.datasetIndex].data[item.index];
4272				return datasetLabel + ': (' + item.xLabel + ', ' + item.yLabel + ', ' + dataPoint.r + ')';
4273			}
4274		}
4275	}
4276});
4277
4278var controller_bubble = core_datasetController.extend({
4279	/**
4280	 * @protected
4281	 */
4282	dataElementType: elements.Point,
4283
4284	/**
4285	 * @protected
4286	 */
4287	update: function(reset) {
4288		var me = this;
4289		var meta = me.getMeta();
4290		var points = meta.data;
4291
4292		// Update Points
4293		helpers$1.each(points, function(point, index) {
4294			me.updateElement(point, index, reset);
4295		});
4296	},
4297
4298	/**
4299	 * @protected
4300	 */
4301	updateElement: function(point, index, reset) {
4302		var me = this;
4303		var meta = me.getMeta();
4304		var custom = point.custom || {};
4305		var xScale = me.getScaleForId(meta.xAxisID);
4306		var yScale = me.getScaleForId(meta.yAxisID);
4307		var options = me._resolveElementOptions(point, index);
4308		var data = me.getDataset().data[index];
4309		var dsIndex = me.index;
4310
4311		var x = reset ? xScale.getPixelForDecimal(0.5) : xScale.getPixelForValue(typeof data === 'object' ? data : NaN, index, dsIndex);
4312		var y = reset ? yScale.getBasePixel() : yScale.getPixelForValue(data, index, dsIndex);
4313
4314		point._xScale = xScale;
4315		point._yScale = yScale;
4316		point._options = options;
4317		point._datasetIndex = dsIndex;
4318		point._index = index;
4319		point._model = {
4320			backgroundColor: options.backgroundColor,
4321			borderColor: options.borderColor,
4322			borderWidth: options.borderWidth,
4323			hitRadius: options.hitRadius,
4324			pointStyle: options.pointStyle,
4325			rotation: options.rotation,
4326			radius: reset ? 0 : options.radius,
4327			skip: custom.skip || isNaN(x) || isNaN(y),
4328			x: x,
4329			y: y,
4330		};
4331
4332		point.pivot();
4333	},
4334
4335	/**
4336	 * @protected
4337	 */
4338	setHoverStyle: function(point) {
4339		var model = point._model;
4340		var options = point._options;
4341		var getHoverColor = helpers$1.getHoverColor;
4342
4343		point.$previousStyle = {
4344			backgroundColor: model.backgroundColor,
4345			borderColor: model.borderColor,
4346			borderWidth: model.borderWidth,
4347			radius: model.radius
4348		};
4349
4350		model.backgroundColor = valueOrDefault$3(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
4351		model.borderColor = valueOrDefault$3(options.hoverBorderColor, getHoverColor(options.borderColor));
4352		model.borderWidth = valueOrDefault$3(options.hoverBorderWidth, options.borderWidth);
4353		model.radius = options.radius + options.hoverRadius;
4354	},
4355
4356	/**
4357	 * @private
4358	 */
4359	_resolveElementOptions: function(point, index) {
4360		var me = this;
4361		var chart = me.chart;
4362		var datasets = chart.data.datasets;
4363		var dataset = datasets[me.index];
4364		var custom = point.custom || {};
4365		var options = chart.options.elements.point;
4366		var data = dataset.data[index];
4367		var values = {};
4368		var i, ilen, key;
4369
4370		// Scriptable options
4371		var context = {
4372			chart: chart,
4373			dataIndex: index,
4374			dataset: dataset,
4375			datasetIndex: me.index
4376		};
4377
4378		var keys = [
4379			'backgroundColor',
4380			'borderColor',
4381			'borderWidth',
4382			'hoverBackgroundColor',
4383			'hoverBorderColor',
4384			'hoverBorderWidth',
4385			'hoverRadius',
4386			'hitRadius',
4387			'pointStyle',
4388			'rotation'
4389		];
4390
4391		for (i = 0, ilen = keys.length; i < ilen; ++i) {
4392			key = keys[i];
4393			values[key] = resolve$2([
4394				custom[key],
4395				dataset[key],
4396				options[key]
4397			], context, index);
4398		}
4399
4400		// Custom radius resolution
4401		values.radius = resolve$2([
4402			custom.radius,
4403			data ? data.r : undefined,
4404			dataset.radius,
4405			options.radius
4406		], context, index);
4407
4408		return values;
4409	}
4410});
4411
4412var resolve$3 = helpers$1.options.resolve;
4413
4414core_defaults._set('doughnut', {
4415	animation: {
4416		// Boolean - Whether we animate the rotation of the Doughnut
4417		animateRotate: true,
4418		// Boolean - Whether we animate scaling the Doughnut from the centre
4419		animateScale: false
4420	},
4421	hover: {
4422		mode: 'single'
4423	},
4424	legendCallback: function(chart) {
4425		var text = [];
4426		text.push('<ul class="' + chart.id + '-legend">');
4427
4428		var data = chart.data;
4429		var datasets = data.datasets;
4430		var labels = data.labels;
4431
4432		if (datasets.length) {
4433			for (var i = 0; i < datasets[0].data.length; ++i) {
4434				text.push('<li><span style="background-color:' + datasets[0].backgroundColor[i] + '"></span>');
4435				if (labels[i]) {
4436					text.push(labels[i]);
4437				}
4438				text.push('</li>');
4439			}
4440		}
4441
4442		text.push('</ul>');
4443		return text.join('');
4444	},
4445	legend: {
4446		labels: {
4447			generateLabels: function(chart) {
4448				var data = chart.data;
4449				if (data.labels.length && data.datasets.length) {
4450					return data.labels.map(function(label, i) {
4451						var meta = chart.getDatasetMeta(0);
4452						var ds = data.datasets[0];
4453						var arc = meta.data[i];
4454						var custom = arc && arc.custom || {};
4455						var arcOpts = chart.options.elements.arc;
4456						var fill = resolve$3([custom.backgroundColor, ds.backgroundColor, arcOpts.backgroundColor], undefined, i);
4457						var stroke = resolve$3([custom.borderColor, ds.borderColor, arcOpts.borderColor], undefined, i);
4458						var bw = resolve$3([custom.borderWidth, ds.borderWidth, arcOpts.borderWidth], undefined, i);
4459
4460						return {
4461							text: label,
4462							fillStyle: fill,
4463							strokeStyle: stroke,
4464							lineWidth: bw,
4465							hidden: isNaN(ds.data[i]) || meta.data[i].hidden,
4466
4467							// Extra data used for toggling the correct item
4468							index: i
4469						};
4470					});
4471				}
4472				return [];
4473			}
4474		},
4475
4476		onClick: function(e, legendItem) {
4477			var index = legendItem.index;
4478			var chart = this.chart;
4479			var i, ilen, meta;
4480
4481			for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
4482				meta = chart.getDatasetMeta(i);
4483				// toggle visibility of index if exists
4484				if (meta.data[index]) {
4485					meta.data[index].hidden = !meta.data[index].hidden;
4486				}
4487			}
4488
4489			chart.update();
4490		}
4491	},
4492
4493	// The percentage of the chart that we cut out of the middle.
4494	cutoutPercentage: 50,
4495
4496	// The rotation of the chart, where the first data arc begins.
4497	rotation: Math.PI * -0.5,
4498
4499	// The total circumference of the chart.
4500	circumference: Math.PI * 2.0,
4501
4502	// Need to override these to give a nice default
4503	tooltips: {
4504		callbacks: {
4505			title: function() {
4506				return '';
4507			},
4508			label: function(tooltipItem, data) {
4509				var dataLabel = data.labels[tooltipItem.index];
4510				var value = ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
4511
4512				if (helpers$1.isArray(dataLabel)) {
4513					// show value on first line of multiline label
4514					// need to clone because we are changing the value
4515					dataLabel = dataLabel.slice();
4516					dataLabel[0] += value;
4517				} else {
4518					dataLabel += value;
4519				}
4520
4521				return dataLabel;
4522			}
4523		}
4524	}
4525});
4526
4527var controller_doughnut = core_datasetController.extend({
4528
4529	dataElementType: elements.Arc,
4530
4531	linkScales: helpers$1.noop,
4532
4533	// Get index of the dataset in relation to the visible datasets. This allows determining the inner and outer radius correctly
4534	getRingIndex: function(datasetIndex) {
4535		var ringIndex = 0;
4536
4537		for (var j = 0; j < datasetIndex; ++j) {
4538			if (this.chart.isDatasetVisible(j)) {
4539				++ringIndex;
4540			}
4541		}
4542
4543		return ringIndex;
4544	},
4545
4546	update: function(reset) {
4547		var me = this;
4548		var chart = me.chart;
4549		var chartArea = chart.chartArea;
4550		var opts = chart.options;
4551		var availableWidth = chartArea.right - chartArea.left;
4552		var availableHeight = chartArea.bottom - chartArea.top;
4553		var minSize = Math.min(availableWidth, availableHeight);
4554		var offset = {x: 0, y: 0};
4555		var meta = me.getMeta();
4556		var arcs = meta.data;
4557		var cutoutPercentage = opts.cutoutPercentage;
4558		var circumference = opts.circumference;
4559		var i, ilen;
4560
4561		// If the chart's circumference isn't a full circle, calculate minSize as a ratio of the width/height of the arc
4562		if (circumference < Math.PI * 2.0) {
4563			var startAngle = opts.rotation % (Math.PI * 2.0);
4564			startAngle += Math.PI * 2.0 * (startAngle >= Math.PI ? -1 : startAngle < -Math.PI ? 1 : 0);
4565			var endAngle = startAngle + circumference;
4566			var start = {x: Math.cos(startAngle), y: Math.sin(startAngle)};
4567			var end = {x: Math.cos(endAngle), y: Math.sin(endAngle)};
4568			var contains0 = (startAngle <= 0 && endAngle >= 0) || (startAngle <= Math.PI * 2.0 && Math.PI * 2.0 <= endAngle);
4569			var contains90 = (startAngle <= Math.PI * 0.5 && Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 2.5 && Math.PI * 2.5 <= endAngle);
4570			var contains180 = (startAngle <= -Math.PI && -Math.PI <= endAngle) || (startAngle <= Math.PI && Math.PI <= endAngle);
4571			var contains270 = (startAngle <= -Math.PI * 0.5 && -Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 1.5 && Math.PI * 1.5 <= endAngle);
4572			var cutout = cutoutPercentage / 100.0;
4573			var min = {x: contains180 ? -1 : Math.min(start.x * (start.x < 0 ? 1 : cutout), end.x * (end.x < 0 ? 1 : cutout)), y: contains270 ? -1 : Math.min(start.y * (start.y < 0 ? 1 : cutout), end.y * (end.y < 0 ? 1 : cutout))};
4574			var max = {x: contains0 ? 1 : Math.max(start.x * (start.x > 0 ? 1 : cutout), end.x * (end.x > 0 ? 1 : cutout)), y: contains90 ? 1 : Math.max(start.y * (start.y > 0 ? 1 : cutout), end.y * (end.y > 0 ? 1 : cutout))};
4575			var size = {width: (max.x - min.x) * 0.5, height: (max.y - min.y) * 0.5};
4576			minSize = Math.min(availableWidth / size.width, availableHeight / size.height);
4577			offset = {x: (max.x + min.x) * -0.5, y: (max.y + min.y) * -0.5};
4578		}
4579
4580		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
4581			arcs[i]._options = me._resolveElementOptions(arcs[i], i);
4582		}
4583
4584		chart.borderWidth = me.getMaxBorderWidth();
4585		chart.outerRadius = Math.max((minSize - chart.borderWidth) / 2, 0);
4586		chart.innerRadius = Math.max(cutoutPercentage ? (chart.outerRadius / 100) * (cutoutPercentage) : 0, 0);
4587		chart.radiusLength = (chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount();
4588		chart.offsetX = offset.x * chart.outerRadius;
4589		chart.offsetY = offset.y * chart.outerRadius;
4590
4591		meta.total = me.calculateTotal();
4592
4593		me.outerRadius = chart.outerRadius - (chart.radiusLength * me.getRingIndex(me.index));
4594		me.innerRadius = Math.max(me.outerRadius - chart.radiusLength, 0);
4595
4596		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
4597			me.updateElement(arcs[i], i, reset);
4598		}
4599	},
4600
4601	updateElement: function(arc, index, reset) {
4602		var me = this;
4603		var chart = me.chart;
4604		var chartArea = chart.chartArea;
4605		var opts = chart.options;
4606		var animationOpts = opts.animation;
4607		var centerX = (chartArea.left + chartArea.right) / 2;
4608		var centerY = (chartArea.top + chartArea.bottom) / 2;
4609		var startAngle = opts.rotation; // non reset case handled later
4610		var endAngle = opts.rotation; // non reset case handled later
4611		var dataset = me.getDataset();
4612		var circumference = reset && animationOpts.animateRotate ? 0 : arc.hidden ? 0 : me.calculateCircumference(dataset.data[index]) * (opts.circumference / (2.0 * Math.PI));
4613		var innerRadius = reset && animationOpts.animateScale ? 0 : me.innerRadius;
4614		var outerRadius = reset && animationOpts.animateScale ? 0 : me.outerRadius;
4615		var options = arc._options || {};
4616
4617		helpers$1.extend(arc, {
4618			// Utility
4619			_datasetIndex: me.index,
4620			_index: index,
4621
4622			// Desired view properties
4623			_model: {
4624				backgroundColor: options.backgroundColor,
4625				borderColor: options.borderColor,
4626				borderWidth: options.borderWidth,
4627				borderAlign: options.borderAlign,
4628				x: centerX + chart.offsetX,
4629				y: centerY + chart.offsetY,
4630				startAngle: startAngle,
4631				endAngle: endAngle,
4632				circumference: circumference,
4633				outerRadius: outerRadius,
4634				innerRadius: innerRadius,
4635				label: helpers$1.valueAtIndexOrDefault(dataset.label, index, chart.data.labels[index])
4636			}
4637		});
4638
4639		var model = arc._model;
4640
4641		// Set correct angles if not resetting
4642		if (!reset || !animationOpts.animateRotate) {
4643			if (index === 0) {
4644				model.startAngle = opts.rotation;
4645			} else {
4646				model.startAngle = me.getMeta().data[index - 1]._model.endAngle;
4647			}
4648
4649			model.endAngle = model.startAngle + model.circumference;
4650		}
4651
4652		arc.pivot();
4653	},
4654
4655	calculateTotal: function() {
4656		var dataset = this.getDataset();
4657		var meta = this.getMeta();
4658		var total = 0;
4659		var value;
4660
4661		helpers$1.each(meta.data, function(element, index) {
4662			value = dataset.data[index];
4663			if (!isNaN(value) && !element.hidden) {
4664				total += Math.abs(value);
4665			}
4666		});
4667
4668		/* if (total === 0) {
4669			total = NaN;
4670		}*/
4671
4672		return total;
4673	},
4674
4675	calculateCircumference: function(value) {
4676		var total = this.getMeta().total;
4677		if (total > 0 && !isNaN(value)) {
4678			return (Math.PI * 2.0) * (Math.abs(value) / total);
4679		}
4680		return 0;
4681	},
4682
4683	// gets the max border or hover width to properly scale pie charts
4684	getMaxBorderWidth: function(arcs) {
4685		var me = this;
4686		var max = 0;
4687		var chart = me.chart;
4688		var i, ilen, meta, arc, controller, options, borderWidth, hoverWidth;
4689
4690		if (!arcs) {
4691			// Find the outmost visible dataset
4692			for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
4693				if (chart.isDatasetVisible(i)) {
4694					meta = chart.getDatasetMeta(i);
4695					arcs = meta.data;
4696					if (i !== me.index) {
4697						controller = meta.controller;
4698					}
4699					break;
4700				}
4701			}
4702		}
4703
4704		if (!arcs) {
4705			return 0;
4706		}
4707
4708		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
4709			arc = arcs[i];
4710			options = controller ? controller._resolveElementOptions(arc, i) : arc._options;
4711			if (options.borderAlign !== 'inner') {
4712				borderWidth = options.borderWidth;
4713				hoverWidth = options.hoverBorderWidth;
4714
4715				max = borderWidth > max ? borderWidth : max;
4716				max = hoverWidth > max ? hoverWidth : max;
4717			}
4718		}
4719		return max;
4720	},
4721
4722	/**
4723	 * @protected
4724	 */
4725	setHoverStyle: function(arc) {
4726		var model = arc._model;
4727		var options = arc._options;
4728		var getHoverColor = helpers$1.getHoverColor;
4729		var valueOrDefault = helpers$1.valueOrDefault;
4730
4731		arc.$previousStyle = {
4732			backgroundColor: model.backgroundColor,
4733			borderColor: model.borderColor,
4734			borderWidth: model.borderWidth,
4735		};
4736
4737		model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
4738		model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
4739		model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
4740	},
4741
4742	/**
4743	 * @private
4744	 */
4745	_resolveElementOptions: function(arc, index) {
4746		var me = this;
4747		var chart = me.chart;
4748		var dataset = me.getDataset();
4749		var custom = arc.custom || {};
4750		var options = chart.options.elements.arc;
4751		var values = {};
4752		var i, ilen, key;
4753
4754		// Scriptable options
4755		var context = {
4756			chart: chart,
4757			dataIndex: index,
4758			dataset: dataset,
4759			datasetIndex: me.index
4760		};
4761
4762		var keys = [
4763			'backgroundColor',
4764			'borderColor',
4765			'borderWidth',
4766			'borderAlign',
4767			'hoverBackgroundColor',
4768			'hoverBorderColor',
4769			'hoverBorderWidth',
4770		];
4771
4772		for (i = 0, ilen = keys.length; i < ilen; ++i) {
4773			key = keys[i];
4774			values[key] = resolve$3([
4775				custom[key],
4776				dataset[key],
4777				options[key]
4778			], context, index);
4779		}
4780
4781		return values;
4782	}
4783});
4784
4785core_defaults._set('horizontalBar', {
4786	hover: {
4787		mode: 'index',
4788		axis: 'y'
4789	},
4790
4791	scales: {
4792		xAxes: [{
4793			type: 'linear',
4794			position: 'bottom'
4795		}],
4796
4797		yAxes: [{
4798			type: 'category',
4799			position: 'left',
4800			categoryPercentage: 0.8,
4801			barPercentage: 0.9,
4802			offset: true,
4803			gridLines: {
4804				offsetGridLines: true
4805			}
4806		}]
4807	},
4808
4809	elements: {
4810		rectangle: {
4811			borderSkipped: 'left'
4812		}
4813	},
4814
4815	tooltips: {
4816		callbacks: {
4817			title: function(item, data) {
4818				// Pick first xLabel for now
4819				var title = '';
4820
4821				if (item.length > 0) {
4822					if (item[0].yLabel) {
4823						title = item[0].yLabel;
4824					} else if (data.labels.length > 0 && item[0].index < data.labels.length) {
4825						title = data.labels[item[0].index];
4826					}
4827				}
4828
4829				return title;
4830			},
4831
4832			label: function(item, data) {
4833				var datasetLabel = data.datasets[item.datasetIndex].label || '';
4834				return datasetLabel + ': ' + item.xLabel;
4835			}
4836		},
4837		mode: 'index',
4838		axis: 'y'
4839	}
4840});
4841
4842var controller_horizontalBar = controller_bar.extend({
4843	/**
4844	 * @private
4845	 */
4846	getValueScaleId: function() {
4847		return this.getMeta().xAxisID;
4848	},
4849
4850	/**
4851	 * @private
4852	 */
4853	getIndexScaleId: function() {
4854		return this.getMeta().yAxisID;
4855	}
4856});
4857
4858var valueOrDefault$4 = helpers$1.valueOrDefault;
4859var resolve$4 = helpers$1.options.resolve;
4860var isPointInArea = helpers$1.canvas._isPointInArea;
4861
4862core_defaults._set('line', {
4863	showLines: true,
4864	spanGaps: false,
4865
4866	hover: {
4867		mode: 'label'
4868	},
4869
4870	scales: {
4871		xAxes: [{
4872			type: 'category',
4873			id: 'x-axis-0'
4874		}],
4875		yAxes: [{
4876			type: 'linear',
4877			id: 'y-axis-0'
4878		}]
4879	}
4880});
4881
4882function lineEnabled(dataset, options) {
4883	return valueOrDefault$4(dataset.showLine, options.showLines);
4884}
4885
4886var controller_line = core_datasetController.extend({
4887
4888	datasetElementType: elements.Line,
4889
4890	dataElementType: elements.Point,
4891
4892	update: function(reset) {
4893		var me = this;
4894		var meta = me.getMeta();
4895		var line = meta.dataset;
4896		var points = meta.data || [];
4897		var options = me.chart.options;
4898		var lineElementOptions = options.elements.line;
4899		var scale = me.getScaleForId(meta.yAxisID);
4900		var i, ilen, custom;
4901		var dataset = me.getDataset();
4902		var showLine = lineEnabled(dataset, options);
4903
4904		// Update Line
4905		if (showLine) {
4906			custom = line.custom || {};
4907
4908			// Compatibility: If the properties are defined with only the old name, use those values
4909			if ((dataset.tension !== undefined) && (dataset.lineTension === undefined)) {
4910				dataset.lineTension = dataset.tension;
4911			}
4912
4913			// Utility
4914			line._scale = scale;
4915			line._datasetIndex = me.index;
4916			// Data
4917			line._children = points;
4918			// Model
4919			line._model = {
4920				// Appearance
4921				// The default behavior of lines is to break at null values, according
4922				// to https://github.com/chartjs/Chart.js/issues/2435#issuecomment-216718158
4923				// This option gives lines the ability to span gaps
4924				spanGaps: valueOrDefault$4(dataset.spanGaps, options.spanGaps),
4925				tension: resolve$4([custom.tension, dataset.lineTension, lineElementOptions.tension]),
4926				backgroundColor: resolve$4([custom.backgroundColor, dataset.backgroundColor, lineElementOptions.backgroundColor]),
4927				borderWidth: resolve$4([custom.borderWidth, dataset.borderWidth, lineElementOptions.borderWidth]),
4928				borderColor: resolve$4([custom.borderColor, dataset.borderColor, lineElementOptions.borderColor]),
4929				borderCapStyle: resolve$4([custom.borderCapStyle, dataset.borderCapStyle, lineElementOptions.borderCapStyle]),
4930				borderDash: resolve$4([custom.borderDash, dataset.borderDash, lineElementOptions.borderDash]),
4931				borderDashOffset: resolve$4([custom.borderDashOffset, dataset.borderDashOffset, lineElementOptions.borderDashOffset]),
4932				borderJoinStyle: resolve$4([custom.borderJoinStyle, dataset.borderJoinStyle, lineElementOptions.borderJoinStyle]),
4933				fill: resolve$4([custom.fill, dataset.fill, lineElementOptions.fill]),
4934				steppedLine: resolve$4([custom.steppedLine, dataset.steppedLine, lineElementOptions.stepped]),
4935				cubicInterpolationMode: resolve$4([custom.cubicInterpolationMode, dataset.cubicInterpolationMode, lineElementOptions.cubicInterpolationMode]),
4936			};
4937
4938			line.pivot();
4939		}
4940
4941		// Update Points
4942		for (i = 0, ilen = points.length; i < ilen; ++i) {
4943			me.updateElement(points[i], i, reset);
4944		}
4945
4946		if (showLine && line._model.tension !== 0) {
4947			me.updateBezierControlPoints();
4948		}
4949
4950		// Now pivot the point for animation
4951		for (i = 0, ilen = points.length; i < ilen; ++i) {
4952			points[i].pivot();
4953		}
4954	},
4955
4956	updateElement: function(point, index, reset) {
4957		var me = this;
4958		var meta = me.getMeta();
4959		var custom = point.custom || {};
4960		var dataset = me.getDataset();
4961		var datasetIndex = me.index;
4962		var value = dataset.data[index];
4963		var yScale = me.getScaleForId(meta.yAxisID);
4964		var xScale = me.getScaleForId(meta.xAxisID);
4965		var x, y;
4966
4967		var options = me._resolveElementOptions(point, index);
4968
4969		x = xScale.getPixelForValue(typeof value === 'object' ? value : NaN, index, datasetIndex);
4970		y = reset ? yScale.getBasePixel() : me.calculatePointY(value, index, datasetIndex);
4971
4972		// Utility
4973		point._xScale = xScale;
4974		point._yScale = yScale;
4975		point._options = options;
4976		point._datasetIndex = datasetIndex;
4977		point._index = index;
4978
4979		// Desired view properties
4980		point._model = {
4981			x: x,
4982			y: y,
4983			skip: custom.skip || isNaN(x) || isNaN(y),
4984			// Appearance
4985			radius: options.radius,
4986			pointStyle: options.pointStyle,
4987			rotation: options.rotation,
4988			backgroundColor: options.backgroundColor,
4989			borderColor: options.borderColor,
4990			borderWidth: options.borderWidth,
4991			tension: meta.dataset._model ? meta.dataset._model.tension : 0,
4992			steppedLine: meta.dataset._model ? meta.dataset._model.steppedLine : false,
4993			// Tooltip
4994			hitRadius: options.hitRadius,
4995		};
4996	},
4997
4998	/**
4999	 * @private
5000	 */
5001	_resolveElementOptions: function(point, index) {
5002		var me = this;
5003		var chart = me.chart;
5004		var datasets = chart.data.datasets;
5005		var dataset = datasets[me.index];
5006		var custom = point.custom || {};
5007		var options = chart.options.elements.point;
5008		var values = {};
5009		var i, ilen, key;
5010
5011		// Scriptable options
5012		var context = {
5013			chart: chart,
5014			dataIndex: index,
5015			dataset: dataset,
5016			datasetIndex: me.index
5017		};
5018
5019		var ELEMENT_OPTIONS = {
5020			backgroundColor: 'pointBackgroundColor',
5021			borderColor: 'pointBorderColor',
5022			borderWidth: 'pointBorderWidth',
5023			hitRadius: 'pointHitRadius',
5024			hoverBackgroundColor: 'pointHoverBackgroundColor',
5025			hoverBorderColor: 'pointHoverBorderColor',
5026			hoverBorderWidth: 'pointHoverBorderWidth',
5027			hoverRadius: 'pointHoverRadius',
5028			pointStyle: 'pointStyle',
5029			radius: 'pointRadius',
5030			rotation: 'pointRotation',
5031		};
5032		var keys = Object.keys(ELEMENT_OPTIONS);
5033
5034		for (i = 0, ilen = keys.length; i < ilen; ++i) {
5035			key = keys[i];
5036			values[key] = resolve$4([
5037				custom[key],
5038				dataset[ELEMENT_OPTIONS[key]],
5039				dataset[key],
5040				options[key]
5041			], context, index);
5042		}
5043
5044		return values;
5045	},
5046
5047	calculatePointY: function(value, index, datasetIndex) {
5048		var me = this;
5049		var chart = me.chart;
5050		var meta = me.getMeta();
5051		var yScale = me.getScaleForId(meta.yAxisID);
5052		var sumPos = 0;
5053		var sumNeg = 0;
5054		var i, ds, dsMeta;
5055
5056		if (yScale.options.stacked) {
5057			for (i = 0; i < datasetIndex; i++) {
5058				ds = chart.data.datasets[i];
5059				dsMeta = chart.getDatasetMeta(i);
5060				if (dsMeta.type === 'line' && dsMeta.yAxisID === yScale.id && chart.isDatasetVisible(i)) {
5061					var stackedRightValue = Number(yScale.getRightValue(ds.data[index]));
5062					if (stackedRightValue < 0) {
5063						sumNeg += stackedRightValue || 0;
5064					} else {
5065						sumPos += stackedRightValue || 0;
5066					}
5067				}
5068			}
5069
5070			var rightValue = Number(yScale.getRightValue(value));
5071			if (rightValue < 0) {
5072				return yScale.getPixelForValue(sumNeg + rightValue);
5073			}
5074			return yScale.getPixelForValue(sumPos + rightValue);
5075		}
5076
5077		return yScale.getPixelForValue(value);
5078	},
5079
5080	updateBezierControlPoints: function() {
5081		var me = this;
5082		var chart = me.chart;
5083		var meta = me.getMeta();
5084		var lineModel = meta.dataset._model;
5085		var area = chart.chartArea;
5086		var points = meta.data || [];
5087		var i, ilen, point, model, controlPoints;
5088
5089		// Only consider points that are drawn in case the spanGaps option is used
5090		if (lineModel.spanGaps) {
5091			points = points.filter(function(pt) {
5092				return !pt._model.skip;
5093			});
5094		}
5095
5096		function capControlPoint(pt, min, max) {
5097			return Math.max(Math.min(pt, max), min);
5098		}
5099
5100		if (lineModel.cubicInterpolationMode === 'monotone') {
5101			helpers$1.splineCurveMonotone(points);
5102		} else {
5103			for (i = 0, ilen = points.length; i < ilen; ++i) {
5104				point = points[i];
5105				model = point._model;
5106				controlPoints = helpers$1.splineCurve(
5107					helpers$1.previousItem(points, i)._model,
5108					model,
5109					helpers$1.nextItem(points, i)._model,
5110					lineModel.tension
5111				);
5112				model.controlPointPreviousX = controlPoints.previous.x;
5113				model.controlPointPreviousY = controlPoints.previous.y;
5114				model.controlPointNextX = controlPoints.next.x;
5115				model.controlPointNextY = controlPoints.next.y;
5116			}
5117		}
5118
5119		if (chart.options.elements.line.capBezierPoints) {
5120			for (i = 0, ilen = points.length; i < ilen; ++i) {
5121				model = points[i]._model;
5122				if (isPointInArea(model, area)) {
5123					if (i > 0 && isPointInArea(points[i - 1]._model, area)) {
5124						model.controlPointPreviousX = capControlPoint(model.controlPointPreviousX, area.left, area.right);
5125						model.controlPointPreviousY = capControlPoint(model.controlPointPreviousY, area.top, area.bottom);
5126					}
5127					if (i < points.length - 1 && isPointInArea(points[i + 1]._model, area)) {
5128						model.controlPointNextX = capControlPoint(model.controlPointNextX, area.left, area.right);
5129						model.controlPointNextY = capControlPoint(model.controlPointNextY, area.top, area.bottom);
5130					}
5131				}
5132			}
5133		}
5134	},
5135
5136	draw: function() {
5137		var me = this;
5138		var chart = me.chart;
5139		var meta = me.getMeta();
5140		var points = meta.data || [];
5141		var area = chart.chartArea;
5142		var ilen = points.length;
5143		var halfBorderWidth;
5144		var i = 0;
5145
5146		if (lineEnabled(me.getDataset(), chart.options)) {
5147			halfBorderWidth = (meta.dataset._model.borderWidth || 0) / 2;
5148
5149			helpers$1.canvas.clipArea(chart.ctx, {
5150				left: area.left,
5151				right: area.right,
5152				top: area.top - halfBorderWidth,
5153				bottom: area.bottom + halfBorderWidth
5154			});
5155
5156			meta.dataset.draw();
5157
5158			helpers$1.canvas.unclipArea(chart.ctx);
5159		}
5160
5161		// Draw the points
5162		for (; i < ilen; ++i) {
5163			points[i].draw(area);
5164		}
5165	},
5166
5167	/**
5168	 * @protected
5169	 */
5170	setHoverStyle: function(point) {
5171		var model = point._model;
5172		var options = point._options;
5173		var getHoverColor = helpers$1.getHoverColor;
5174
5175		point.$previousStyle = {
5176			backgroundColor: model.backgroundColor,
5177			borderColor: model.borderColor,
5178			borderWidth: model.borderWidth,
5179			radius: model.radius
5180		};
5181
5182		model.backgroundColor = valueOrDefault$4(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
5183		model.borderColor = valueOrDefault$4(options.hoverBorderColor, getHoverColor(options.borderColor));
5184		model.borderWidth = valueOrDefault$4(options.hoverBorderWidth, options.borderWidth);
5185		model.radius = valueOrDefault$4(options.hoverRadius, options.radius);
5186	},
5187});
5188
5189var resolve$5 = helpers$1.options.resolve;
5190
5191core_defaults._set('polarArea', {
5192	scale: {
5193		type: 'radialLinear',
5194		angleLines: {
5195			display: false
5196		},
5197		gridLines: {
5198			circular: true
5199		},
5200		pointLabels: {
5201			display: false
5202		},
5203		ticks: {
5204			beginAtZero: true
5205		}
5206	},
5207
5208	// Boolean - Whether to animate the rotation of the chart
5209	animation: {
5210		animateRotate: true,
5211		animateScale: true
5212	},
5213
5214	startAngle: -0.5 * Math.PI,
5215	legendCallback: function(chart) {
5216		var text = [];
5217		text.push('<ul class="' + chart.id + '-legend">');
5218
5219		var data = chart.data;
5220		var datasets = data.datasets;
5221		var labels = data.labels;
5222
5223		if (datasets.length) {
5224			for (var i = 0; i < datasets[0].data.length; ++i) {
5225				text.push('<li><span style="background-color:' + datasets[0].backgroundColor[i] + '"></span>');
5226				if (labels[i]) {
5227					text.push(labels[i]);
5228				}
5229				text.push('</li>');
5230			}
5231		}
5232
5233		text.push('</ul>');
5234		return text.join('');
5235	},
5236	legend: {
5237		labels: {
5238			generateLabels: function(chart) {
5239				var data = chart.data;
5240				if (data.labels.length && data.datasets.length) {
5241					return data.labels.map(function(label, i) {
5242						var meta = chart.getDatasetMeta(0);
5243						var ds = data.datasets[0];
5244						var arc = meta.data[i];
5245						var custom = arc.custom || {};
5246						var arcOpts = chart.options.elements.arc;
5247						var fill = resolve$5([custom.backgroundColor, ds.backgroundColor, arcOpts.backgroundColor], undefined, i);
5248						var stroke = resolve$5([custom.borderColor, ds.borderColor, arcOpts.borderColor], undefined, i);
5249						var bw = resolve$5([custom.borderWidth, ds.borderWidth, arcOpts.borderWidth], undefined, i);
5250
5251						return {
5252							text: label,
5253							fillStyle: fill,
5254							strokeStyle: stroke,
5255							lineWidth: bw,
5256							hidden: isNaN(ds.data[i]) || meta.data[i].hidden,
5257
5258							// Extra data used for toggling the correct item
5259							index: i
5260						};
5261					});
5262				}
5263				return [];
5264			}
5265		},
5266
5267		onClick: function(e, legendItem) {
5268			var index = legendItem.index;
5269			var chart = this.chart;
5270			var i, ilen, meta;
5271
5272			for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
5273				meta = chart.getDatasetMeta(i);
5274				meta.data[index].hidden = !meta.data[index].hidden;
5275			}
5276
5277			chart.update();
5278		}
5279	},
5280
5281	// Need to override these to give a nice default
5282	tooltips: {
5283		callbacks: {
5284			title: function() {
5285				return '';
5286			},
5287			label: function(item, data) {
5288				return data.labels[item.index] + ': ' + item.yLabel;
5289			}
5290		}
5291	}
5292});
5293
5294var controller_polarArea = core_datasetController.extend({
5295
5296	dataElementType: elements.Arc,
5297
5298	linkScales: helpers$1.noop,
5299
5300	update: function(reset) {
5301		var me = this;
5302		var dataset = me.getDataset();
5303		var meta = me.getMeta();
5304		var start = me.chart.options.startAngle || 0;
5305		var starts = me._starts = [];
5306		var angles = me._angles = [];
5307		var arcs = meta.data;
5308		var i, ilen, angle;
5309
5310		me._updateRadius();
5311
5312		meta.count = me.countVisibleElements();
5313
5314		for (i = 0, ilen = dataset.data.length; i < ilen; i++) {
5315			starts[i] = start;
5316			angle = me._computeAngle(i);
5317			angles[i] = angle;
5318			start += angle;
5319		}
5320
5321		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
5322			arcs[i]._options = me._resolveElementOptions(arcs[i], i);
5323			me.updateElement(arcs[i], i, reset);
5324		}
5325	},
5326
5327	/**
5328	 * @private
5329	 */
5330	_updateRadius: function() {
5331		var me = this;
5332		var chart = me.chart;
5333		var chartArea = chart.chartArea;
5334		var opts = chart.options;
5335		var minSize = Math.min(chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
5336
5337		chart.outerRadius = Math.max(minSize / 2, 0);
5338		chart.innerRadius = Math.max(opts.cutoutPercentage ? (chart.outerRadius / 100) * (opts.cutoutPercentage) : 1, 0);
5339		chart.radiusLength = (chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount();
5340
5341		me.outerRadius = chart.outerRadius - (chart.radiusLength * me.index);
5342		me.innerRadius = me.outerRadius - chart.radiusLength;
5343	},
5344
5345	updateElement: function(arc, index, reset) {
5346		var me = this;
5347		var chart = me.chart;
5348		var dataset = me.getDataset();
5349		var opts = chart.options;
5350		var animationOpts = opts.animation;
5351		var scale = chart.scale;
5352		var labels = chart.data.labels;
5353
5354		var centerX = scale.xCenter;
5355		var centerY = scale.yCenter;
5356
5357		// var negHalfPI = -0.5 * Math.PI;
5358		var datasetStartAngle = opts.startAngle;
5359		var distance = arc.hidden ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
5360		var startAngle = me._starts[index];
5361		var endAngle = startAngle + (arc.hidden ? 0 : me._angles[index]);
5362
5363		var resetRadius = animationOpts.animateScale ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
5364		var options = arc._options || {};
5365
5366		helpers$1.extend(arc, {
5367			// Utility
5368			_datasetIndex: me.index,
5369			_index: index,
5370			_scale: scale,
5371
5372			// Desired view properties
5373			_model: {
5374				backgroundColor: options.backgroundColor,
5375				borderColor: options.borderColor,
5376				borderWidth: options.borderWidth,
5377				borderAlign: options.borderAlign,
5378				x: centerX,
5379				y: centerY,
5380				innerRadius: 0,
5381				outerRadius: reset ? resetRadius : distance,
5382				startAngle: reset && animationOpts.animateRotate ? datasetStartAngle : startAngle,
5383				endAngle: reset && animationOpts.animateRotate ? datasetStartAngle : endAngle,
5384				label: helpers$1.valueAtIndexOrDefault(labels, index, labels[index])
5385			}
5386		});
5387
5388		arc.pivot();
5389	},
5390
5391	countVisibleElements: function() {
5392		var dataset = this.getDataset();
5393		var meta = this.getMeta();
5394		var count = 0;
5395
5396		helpers$1.each(meta.data, function(element, index) {
5397			if (!isNaN(dataset.data[index]) && !element.hidden) {
5398				count++;
5399			}
5400		});
5401
5402		return count;
5403	},
5404
5405	/**
5406	 * @protected
5407	 */
5408	setHoverStyle: function(arc) {
5409		var model = arc._model;
5410		var options = arc._options;
5411		var getHoverColor = helpers$1.getHoverColor;
5412		var valueOrDefault = helpers$1.valueOrDefault;
5413
5414		arc.$previousStyle = {
5415			backgroundColor: model.backgroundColor,
5416			borderColor: model.borderColor,
5417			borderWidth: model.borderWidth,
5418		};
5419
5420		model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
5421		model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
5422		model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
5423	},
5424
5425	/**
5426	 * @private
5427	 */
5428	_resolveElementOptions: function(arc, index) {
5429		var me = this;
5430		var chart = me.chart;
5431		var dataset = me.getDataset();
5432		var custom = arc.custom || {};
5433		var options = chart.options.elements.arc;
5434		var values = {};
5435		var i, ilen, key;
5436
5437		// Scriptable options
5438		var context = {
5439			chart: chart,
5440			dataIndex: index,
5441			dataset: dataset,
5442			datasetIndex: me.index
5443		};
5444
5445		var keys = [
5446			'backgroundColor',
5447			'borderColor',
5448			'borderWidth',
5449			'borderAlign',
5450			'hoverBackgroundColor',
5451			'hoverBorderColor',
5452			'hoverBorderWidth',
5453		];
5454
5455		for (i = 0, ilen = keys.length; i < ilen; ++i) {
5456			key = keys[i];
5457			values[key] = resolve$5([
5458				custom[key],
5459				dataset[key],
5460				options[key]
5461			], context, index);
5462		}
5463
5464		return values;
5465	},
5466
5467	/**
5468	 * @private
5469	 */
5470	_computeAngle: function(index) {
5471		var me = this;
5472		var count = this.getMeta().count;
5473		var dataset = me.getDataset();
5474		var meta = me.getMeta();
5475
5476		if (isNaN(dataset.data[index]) || meta.data[index].hidden) {
5477			return 0;
5478		}
5479
5480		// Scriptable options
5481		var context = {
5482			chart: me.chart,
5483			dataIndex: index,
5484			dataset: dataset,
5485			datasetIndex: me.index
5486		};
5487
5488		return resolve$5([
5489			me.chart.options.elements.arc.angle,
5490			(2 * Math.PI) / count
5491		], context, index);
5492	}
5493});
5494
5495core_defaults._set('pie', helpers$1.clone(core_defaults.doughnut));
5496core_defaults._set('pie', {
5497	cutoutPercentage: 0
5498});
5499
5500// Pie charts are Doughnut chart with different defaults
5501var controller_pie = controller_doughnut;
5502
5503var resolve$6 = helpers$1.options.resolve;
5504
5505core_defaults._set('radar', {
5506	scale: {
5507		type: 'radialLinear'
5508	},
5509	elements: {
5510		line: {
5511			tension: 0 // no bezier in radar
5512		}
5513	}
5514});
5515
5516var controller_radar = core_datasetController.extend({
5517
5518	datasetElementType: elements.Line,
5519
5520	dataElementType: elements.Point,
5521
5522	linkScales: helpers$1.noop,
5523
5524	update: function(reset) {
5525		var me = this;
5526		var meta = me.getMeta();
5527		var line = meta.dataset;
5528		var points = meta.data || [];
5529		var custom = line.custom || {};
5530		var dataset = me.getDataset();
5531		var lineElementOptions = me.chart.options.elements.line;
5532		var scale = me.chart.scale;
5533		var i, ilen;
5534
5535		// Compatibility: If the properties are defined with only the old name, use those values
5536		if ((dataset.tension !== undefined) && (dataset.lineTension === undefined)) {
5537			dataset.lineTension = dataset.tension;
5538		}
5539
5540		helpers$1.extend(meta.dataset, {
5541			// Utility
5542			_datasetIndex: me.index,
5543			_scale: scale,
5544			// Data
5545			_children: points,
5546			_loop: true,
5547			// Model
5548			_model: {
5549				// Appearance
5550				tension: resolve$6([custom.tension, dataset.lineTension, lineElementOptions.tension]),
5551				backgroundColor: resolve$6([custom.backgroundColor, dataset.backgroundColor, lineElementOptions.backgroundColor]),
5552				borderWidth: resolve$6([custom.borderWidth, dataset.borderWidth, lineElementOptions.borderWidth]),
5553				borderColor: resolve$6([custom.borderColor, dataset.borderColor, lineElementOptions.borderColor]),
5554				fill: resolve$6([custom.fill, dataset.fill, lineElementOptions.fill]),
5555				borderCapStyle: resolve$6([custom.borderCapStyle, dataset.borderCapStyle, lineElementOptions.borderCapStyle]),
5556				borderDash: resolve$6([custom.borderDash, dataset.borderDash, lineElementOptions.borderDash]),
5557				borderDashOffset: resolve$6([custom.borderDashOffset, dataset.borderDashOffset, lineElementOptions.borderDashOffset]),
5558				borderJoinStyle: resolve$6([custom.borderJoinStyle, dataset.borderJoinStyle, lineElementOptions.borderJoinStyle]),
5559			}
5560		});
5561
5562		meta.dataset.pivot();
5563
5564		// Update Points
5565		for (i = 0, ilen = points.length; i < ilen; i++) {
5566			me.updateElement(points[i], i, reset);
5567		}
5568
5569		// Update bezier control points
5570		me.updateBezierControlPoints();
5571
5572		// Now pivot the point for animation
5573		for (i = 0, ilen = points.length; i < ilen; i++) {
5574			points[i].pivot();
5575		}
5576	},
5577
5578	updateElement: function(point, index, reset) {
5579		var me = this;
5580		var custom = point.custom || {};
5581		var dataset = me.getDataset();
5582		var scale = me.chart.scale;
5583		var pointElementOptions = me.chart.options.elements.point;
5584		var pointPosition = scale.getPointPositionForValue(index, dataset.data[index]);
5585
5586		// Compatibility: If the properties are defined with only the old name, use those values
5587		if ((dataset.radius !== undefined) && (dataset.pointRadius === undefined)) {
5588			dataset.pointRadius = dataset.radius;
5589		}
5590		if ((dataset.hitRadius !== undefined) && (dataset.pointHitRadius === undefined)) {
5591			dataset.pointHitRadius = dataset.hitRadius;
5592		}
5593
5594		helpers$1.extend(point, {
5595			// Utility
5596			_datasetIndex: me.index,
5597			_index: index,
5598			_scale: scale,
5599
5600			// Desired view properties
5601			_model: {
5602				x: reset ? scale.xCenter : pointPosition.x, // value not used in dataset scale, but we want a consistent API between scales
5603				y: reset ? scale.yCenter : pointPosition.y,
5604
5605				// Appearance
5606				tension: resolve$6([custom.tension, dataset.lineTension, me.chart.options.elements.line.tension]),
5607				radius: resolve$6([custom.radius, dataset.pointRadius, pointElementOptions.radius], undefined, index),
5608				backgroundColor: resolve$6([custom.backgroundColor, dataset.pointBackgroundColor, pointElementOptions.backgroundColor], undefined, index),
5609				borderColor: resolve$6([custom.borderColor, dataset.pointBorderColor, pointElementOptions.borderColor], undefined, index),
5610				borderWidth: resolve$6([custom.borderWidth, dataset.pointBorderWidth, pointElementOptions.borderWidth], undefined, index),
5611				pointStyle: resolve$6([custom.pointStyle, dataset.pointStyle, pointElementOptions.pointStyle], undefined, index),
5612				rotation: resolve$6([custom.rotation, dataset.pointRotation, pointElementOptions.rotation], undefined, index),
5613
5614				// Tooltip
5615				hitRadius: resolve$6([custom.hitRadius, dataset.pointHitRadius, pointElementOptions.hitRadius], undefined, index)
5616			}
5617		});
5618
5619		point._model.skip = custom.skip || isNaN(point._model.x) || isNaN(point._model.y);
5620	},
5621
5622	updateBezierControlPoints: function() {
5623		var me = this;
5624		var meta = me.getMeta();
5625		var area = me.chart.chartArea;
5626		var points = meta.data || [];
5627		var i, ilen, model, controlPoints;
5628
5629		function capControlPoint(pt, min, max) {
5630			return Math.max(Math.min(pt, max), min);
5631		}
5632
5633		for (i = 0, ilen = points.length; i < ilen; i++) {
5634			model = points[i]._model;
5635			controlPoints = helpers$1.splineCurve(
5636				helpers$1.previousItem(points, i, true)._model,
5637				model,
5638				helpers$1.nextItem(points, i, true)._model,
5639				model.tension
5640			);
5641
5642			// Prevent the bezier going outside of the bounds of the graph
5643			model.controlPointPreviousX = capControlPoint(controlPoints.previous.x, area.left, area.right);
5644			model.controlPointPreviousY = capControlPoint(controlPoints.previous.y, area.top, area.bottom);
5645			model.controlPointNextX = capControlPoint(controlPoints.next.x, area.left, area.right);
5646			model.controlPointNextY = capControlPoint(controlPoints.next.y, area.top, area.bottom);
5647		}
5648	},
5649
5650	setHoverStyle: function(point) {
5651		// Point
5652		var dataset = this.chart.data.datasets[point._datasetIndex];
5653		var custom = point.custom || {};
5654		var index = point._index;
5655		var model = point._model;
5656		var getHoverColor = helpers$1.getHoverColor;
5657
5658		point.$previousStyle = {
5659			backgroundColor: model.backgroundColor,
5660			borderColor: model.borderColor,
5661			borderWidth: model.borderWidth,
5662			radius: model.radius
5663		};
5664
5665		model.radius = resolve$6([custom.hoverRadius, dataset.pointHoverRadius, this.chart.options.elements.point.hoverRadius], undefined, index);
5666		model.backgroundColor = resolve$6([custom.hoverBackgroundColor, dataset.pointHoverBackgroundColor, getHoverColor(model.backgroundColor)], undefined, index);
5667		model.borderColor = resolve$6([custom.hoverBorderColor, dataset.pointHoverBorderColor, getHoverColor(model.borderColor)], undefined, index);
5668		model.borderWidth = resolve$6([custom.hoverBorderWidth, dataset.pointHoverBorderWidth, model.borderWidth], undefined, index);
5669	}
5670});
5671
5672core_defaults._set('scatter', {
5673	hover: {
5674		mode: 'single'
5675	},
5676
5677	scales: {
5678		xAxes: [{
5679			id: 'x-axis-1',    // need an ID so datasets can reference the scale
5680			type: 'linear',    // scatter should not use a category axis
5681			position: 'bottom'
5682		}],
5683		yAxes: [{
5684			id: 'y-axis-1',
5685			type: 'linear',
5686			position: 'left'
5687		}]
5688	},
5689
5690	showLines: false,
5691
5692	tooltips: {
5693		callbacks: {
5694			title: function() {
5695				return '';     // doesn't make sense for scatter since data are formatted as a point
5696			},
5697			label: function(item) {
5698				return '(' + item.xLabel + ', ' + item.yLabel + ')';
5699			}
5700		}
5701	}
5702});
5703
5704// Scatter charts use line controllers
5705var controller_scatter = controller_line;
5706
5707// NOTE export a map in which the key represents the controller type, not
5708// the class, and so must be CamelCase in order to be correctly retrieved
5709// by the controller in core.controller.js (`controllers[meta.type]`).
5710
5711var controllers = {
5712	bar: controller_bar,
5713	bubble: controller_bubble,
5714	doughnut: controller_doughnut,
5715	horizontalBar: controller_horizontalBar,
5716	line: controller_line,
5717	polarArea: controller_polarArea,
5718	pie: controller_pie,
5719	radar: controller_radar,
5720	scatter: controller_scatter
5721};
5722
5723/**
5724 * Helper function to get relative position for an event
5725 * @param {Event|IEvent} event - The event to get the position for
5726 * @param {Chart} chart - The chart
5727 * @returns {Point} the event position
5728 */
5729function getRelativePosition(e, chart) {
5730	if (e.native) {
5731		return {
5732			x: e.x,
5733			y: e.y
5734		};
5735	}
5736
5737	return helpers$1.getRelativePosition(e, chart);
5738}
5739
5740/**
5741 * Helper function to traverse all of the visible elements in the chart
5742 * @param chart {chart} the chart
5743 * @param handler {Function} the callback to execute for each visible item
5744 */
5745function parseVisibleItems(chart, handler) {
5746	var datasets = chart.data.datasets;
5747	var meta, i, j, ilen, jlen;
5748
5749	for (i = 0, ilen = datasets.length; i < ilen; ++i) {
5750		if (!chart.isDatasetVisible(i)) {
5751			continue;
5752		}
5753
5754		meta = chart.getDatasetMeta(i);
5755		for (j = 0, jlen = meta.data.length; j < jlen; ++j) {
5756			var element = meta.data[j];
5757			if (!element._view.skip) {
5758				handler(element);
5759			}
5760		}
5761	}
5762}
5763
5764/**
5765 * Helper function to get the items that intersect the event position
5766 * @param items {ChartElement[]} elements to filter
5767 * @param position {Point} the point to be nearest to
5768 * @return {ChartElement[]} the nearest items
5769 */
5770function getIntersectItems(chart, position) {
5771	var elements = [];
5772
5773	parseVisibleItems(chart, function(element) {
5774		if (element.inRange(position.x, position.y)) {
5775			elements.push(element);
5776		}
5777	});
5778
5779	return elements;
5780}
5781
5782/**
5783 * Helper function to get the items nearest to the event position considering all visible items in teh chart
5784 * @param chart {Chart} the chart to look at elements from
5785 * @param position {Point} the point to be nearest to
5786 * @param intersect {Boolean} if true, only consider items that intersect the position
5787 * @param distanceMetric {Function} function to provide the distance between points
5788 * @return {ChartElement[]} the nearest items
5789 */
5790function getNearestItems(chart, position, intersect, distanceMetric) {
5791	var minDistance = Number.POSITIVE_INFINITY;
5792	var nearestItems = [];
5793
5794	parseVisibleItems(chart, function(element) {
5795		if (intersect && !element.inRange(position.x, position.y)) {
5796			return;
5797		}
5798
5799		var center = element.getCenterPoint();
5800		var distance = distanceMetric(position, center);
5801
5802		if (distance < minDistance) {
5803			nearestItems = [element];
5804			minDistance = distance;
5805		} else if (distance === minDistance) {
5806			// Can have multiple items at the same distance in which case we sort by size
5807			nearestItems.push(element);
5808		}
5809	});
5810
5811	return nearestItems;
5812}
5813
5814/**
5815 * Get a distance metric function for two points based on the
5816 * axis mode setting
5817 * @param {String} axis the axis mode. x|y|xy
5818 */
5819function getDistanceMetricForAxis(axis) {
5820	var useX = axis.indexOf('x') !== -1;
5821	var useY = axis.indexOf('y') !== -1;
5822
5823	return function(pt1, pt2) {
5824		var deltaX = useX ? Math.abs(pt1.x - pt2.x) : 0;
5825		var deltaY = useY ? Math.abs(pt1.y - pt2.y) : 0;
5826		return Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));
5827	};
5828}
5829
5830function indexMode(chart, e, options) {
5831	var position = getRelativePosition(e, chart);
5832	// Default axis for index mode is 'x' to match old behaviour
5833	options.axis = options.axis || 'x';
5834	var distanceMetric = getDistanceMetricForAxis(options.axis);
5835	var items = options.intersect ? getIntersectItems(chart, position) : getNearestItems(chart, position, false, distanceMetric);
5836	var elements = [];
5837
5838	if (!items.length) {
5839		return [];
5840	}
5841
5842	chart.data.datasets.forEach(function(dataset, datasetIndex) {
5843		if (chart.isDatasetVisible(datasetIndex)) {
5844			var meta = chart.getDatasetMeta(datasetIndex);
5845			var element = meta.data[items[0]._index];
5846
5847			// don't count items that are skipped (null data)
5848			if (element && !element._view.skip) {
5849				elements.push(element);
5850			}
5851		}
5852	});
5853
5854	return elements;
5855}
5856
5857/**
5858 * @interface IInteractionOptions
5859 */
5860/**
5861 * If true, only consider items that intersect the point
5862 * @name IInterfaceOptions#boolean
5863 * @type Boolean
5864 */
5865
5866/**
5867 * Contains interaction related functions
5868 * @namespace Chart.Interaction
5869 */
5870var core_interaction = {
5871	// Helper function for different modes
5872	modes: {
5873		single: function(chart, e) {
5874			var position = getRelativePosition(e, chart);
5875			var elements = [];
5876
5877			parseVisibleItems(chart, function(element) {
5878				if (element.inRange(position.x, position.y)) {
5879					elements.push(element);
5880					return elements;
5881				}
5882			});
5883
5884			return elements.slice(0, 1);
5885		},
5886
5887		/**
5888		 * @function Chart.Interaction.modes.label
5889		 * @deprecated since version 2.4.0
5890		 * @todo remove at version 3
5891		 * @private
5892		 */
5893		label: indexMode,
5894
5895		/**
5896		 * Returns items at the same index. If the options.intersect parameter is true, we only return items if we intersect something
5897		 * If the options.intersect mode is false, we find the nearest item and return the items at the same index as that item
5898		 * @function Chart.Interaction.modes.index
5899		 * @since v2.4.0
5900		 * @param chart {chart} the chart we are returning items from
5901		 * @param e {Event} the event we are find things at
5902		 * @param options {IInteractionOptions} options to use during interaction
5903		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
5904		 */
5905		index: indexMode,
5906
5907		/**
5908		 * Returns items in the same dataset. If the options.intersect parameter is true, we only return items if we intersect something
5909		 * If the options.intersect is false, we find the nearest item and return the items in that dataset
5910		 * @function Chart.Interaction.modes.dataset
5911		 * @param chart {chart} the chart we are returning items from
5912		 * @param e {Event} the event we are find things at
5913		 * @param options {IInteractionOptions} options to use during interaction
5914		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
5915		 */
5916		dataset: function(chart, e, options) {
5917			var position = getRelativePosition(e, chart);
5918			options.axis = options.axis || 'xy';
5919			var distanceMetric = getDistanceMetricForAxis(options.axis);
5920			var items = options.intersect ? getIntersectItems(chart, position) : getNearestItems(chart, position, false, distanceMetric);
5921
5922			if (items.length > 0) {
5923				items = chart.getDatasetMeta(items[0]._datasetIndex).data;
5924			}
5925
5926			return items;
5927		},
5928
5929		/**
5930		 * @function Chart.Interaction.modes.x-axis
5931		 * @deprecated since version 2.4.0. Use index mode and intersect == true
5932		 * @todo remove at version 3
5933		 * @private
5934		 */
5935		'x-axis': function(chart, e) {
5936			return indexMode(chart, e, {intersect: false});
5937		},
5938
5939		/**
5940		 * Point mode returns all elements that hit test based on the event position
5941		 * of the event
5942		 * @function Chart.Interaction.modes.intersect
5943		 * @param chart {chart} the chart we are returning items from
5944		 * @param e {Event} the event we are find things at
5945		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
5946		 */
5947		point: function(chart, e) {
5948			var position = getRelativePosition(e, chart);
5949			return getIntersectItems(chart, position);
5950		},
5951
5952		/**
5953		 * nearest mode returns the element closest to the point
5954		 * @function Chart.Interaction.modes.intersect
5955		 * @param chart {chart} the chart we are returning items from
5956		 * @param e {Event} the event we are find things at
5957		 * @param options {IInteractionOptions} options to use
5958		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
5959		 */
5960		nearest: function(chart, e, options) {
5961			var position = getRelativePosition(e, chart);
5962			options.axis = options.axis || 'xy';
5963			var distanceMetric = getDistanceMetricForAxis(options.axis);
5964			return getNearestItems(chart, position, options.intersect, distanceMetric);
5965		},
5966
5967		/**
5968		 * x mode returns the elements that hit-test at the current x coordinate
5969		 * @function Chart.Interaction.modes.x
5970		 * @param chart {chart} the chart we are returning items from
5971		 * @param e {Event} the event we are find things at
5972		 * @param options {IInteractionOptions} options to use
5973		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
5974		 */
5975		x: function(chart, e, options) {
5976			var position = getRelativePosition(e, chart);
5977			var items = [];
5978			var intersectsItem = false;
5979
5980			parseVisibleItems(chart, function(element) {
5981				if (element.inXRange(position.x)) {
5982					items.push(element);
5983				}
5984
5985				if (element.inRange(position.x, position.y)) {
5986					intersectsItem = true;
5987				}
5988			});
5989
5990			// If we want to trigger on an intersect and we don't have any items
5991			// that intersect the position, return nothing
5992			if (options.intersect && !intersectsItem) {
5993				items = [];
5994			}
5995			return items;
5996		},
5997
5998		/**
5999		 * y mode returns the elements that hit-test at the current y coordinate
6000		 * @function Chart.Interaction.modes.y
6001		 * @param chart {chart} the chart we are returning items from
6002		 * @param e {Event} the event we are find things at
6003		 * @param options {IInteractionOptions} options to use
6004		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
6005		 */
6006		y: function(chart, e, options) {
6007			var position = getRelativePosition(e, chart);
6008			var items = [];
6009			var intersectsItem = false;
6010
6011			parseVisibleItems(chart, function(element) {
6012				if (element.inYRange(position.y)) {
6013					items.push(element);
6014				}
6015
6016				if (element.inRange(position.x, position.y)) {
6017					intersectsItem = true;
6018				}
6019			});
6020
6021			// If we want to trigger on an intersect and we don't have any items
6022			// that intersect the position, return nothing
6023			if (options.intersect && !intersectsItem) {
6024				items = [];
6025			}
6026			return items;
6027		}
6028	}
6029};
6030
6031function filterByPosition(array, position) {
6032	return helpers$1.where(array, function(v) {
6033		return v.position === position;
6034	});
6035}
6036
6037function sortByWeight(array, reverse) {
6038	array.forEach(function(v, i) {
6039		v._tmpIndex_ = i;
6040		return v;
6041	});
6042	array.sort(function(a, b) {
6043		var v0 = reverse ? b : a;
6044		var v1 = reverse ? a : b;
6045		return v0.weight === v1.weight ?
6046			v0._tmpIndex_ - v1._tmpIndex_ :
6047			v0.weight - v1.weight;
6048	});
6049	array.forEach(function(v) {
6050		delete v._tmpIndex_;
6051	});
6052}
6053
6054core_defaults._set('global', {
6055	layout: {
6056		padding: {
6057			top: 0,
6058			right: 0,
6059			bottom: 0,
6060			left: 0
6061		}
6062	}
6063});
6064
6065/**
6066 * @interface ILayoutItem
6067 * @prop {String} position - The position of the item in the chart layout. Possible values are
6068 * 'left', 'top', 'right', 'bottom', and 'chartArea'
6069 * @prop {Number} weight - The weight used to sort the item. Higher weights are further away from the chart area
6070 * @prop {Boolean} fullWidth - if true, and the item is horizontal, then push vertical boxes down
6071 * @prop {Function} isHorizontal - returns true if the layout item is horizontal (ie. top or bottom)
6072 * @prop {Function} update - Takes two parameters: width and height. Returns size of item
6073 * @prop {Function} getPadding -  Returns an object with padding on the edges
6074 * @prop {Number} width - Width of item. Must be valid after update()
6075 * @prop {Number} height - Height of item. Must be valid after update()
6076 * @prop {Number} left - Left edge of the item. Set by layout system and cannot be used in update
6077 * @prop {Number} top - Top edge of the item. Set by layout system and cannot be used in update
6078 * @prop {Number} right - Right edge of the item. Set by layout system and cannot be used in update
6079 * @prop {Number} bottom - Bottom edge of the item. Set by layout system and cannot be used in update
6080 */
6081
6082// The layout service is very self explanatory.  It's responsible for the layout within a chart.
6083// Scales, Legends and Plugins all rely on the layout service and can easily register to be placed anywhere they need
6084// It is this service's responsibility of carrying out that layout.
6085var core_layouts = {
6086	defaults: {},
6087
6088	/**
6089	 * Register a box to a chart.
6090	 * A box is simply a reference to an object that requires layout. eg. Scales, Legend, Title.
6091	 * @param {Chart} chart - the chart to use
6092	 * @param {ILayoutItem} item - the item to add to be layed out
6093	 */
6094	addBox: function(chart, item) {
6095		if (!chart.boxes) {
6096			chart.boxes = [];
6097		}
6098
6099		// initialize item with default values
6100		item.fullWidth = item.fullWidth || false;
6101		item.position = item.position || 'top';
6102		item.weight = item.weight || 0;
6103
6104		chart.boxes.push(item);
6105	},
6106
6107	/**
6108	 * Remove a layoutItem from a chart
6109	 * @param {Chart} chart - the chart to remove the box from
6110	 * @param {Object} layoutItem - the item to remove from the layout
6111	 */
6112	removeBox: function(chart, layoutItem) {
6113		var index = chart.boxes ? chart.boxes.indexOf(layoutItem) : -1;
6114		if (index !== -1) {
6115			chart.boxes.splice(index, 1);
6116		}
6117	},
6118
6119	/**
6120	 * Sets (or updates) options on the given `item`.
6121	 * @param {Chart} chart - the chart in which the item lives (or will be added to)
6122	 * @param {Object} item - the item to configure with the given options
6123	 * @param {Object} options - the new item options.
6124	 */
6125	configure: function(chart, item, options) {
6126		var props = ['fullWidth', 'position', 'weight'];
6127		var ilen = props.length;
6128		var i = 0;
6129		var prop;
6130
6131		for (; i < ilen; ++i) {
6132			prop = props[i];
6133			if (options.hasOwnProperty(prop)) {
6134				item[prop] = options[prop];
6135			}
6136		}
6137	},
6138
6139	/**
6140	 * Fits boxes of the given chart into the given size by having each box measure itself
6141	 * then running a fitting algorithm
6142	 * @param {Chart} chart - the chart
6143	 * @param {Number} width - the width to fit into
6144	 * @param {Number} height - the height to fit into
6145	 */
6146	update: function(chart, width, height) {
6147		if (!chart) {
6148			return;
6149		}
6150
6151		var layoutOptions = chart.options.layout || {};
6152		var padding = helpers$1.options.toPadding(layoutOptions.padding);
6153		var leftPadding = padding.left;
6154		var rightPadding = padding.right;
6155		var topPadding = padding.top;
6156		var bottomPadding = padding.bottom;
6157
6158		var leftBoxes = filterByPosition(chart.boxes, 'left');
6159		var rightBoxes = filterByPosition(chart.boxes, 'right');
6160		var topBoxes = filterByPosition(chart.boxes, 'top');
6161		var bottomBoxes = filterByPosition(chart.boxes, 'bottom');
6162		var chartAreaBoxes = filterByPosition(chart.boxes, 'chartArea');
6163
6164		// Sort boxes by weight. A higher weight is further away from the chart area
6165		sortByWeight(leftBoxes, true);
6166		sortByWeight(rightBoxes, false);
6167		sortByWeight(topBoxes, true);
6168		sortByWeight(bottomBoxes, false);
6169
6170		// Essentially we now have any number of boxes on each of the 4 sides.
6171		// Our canvas looks like the following.
6172		// The areas L1 and L2 are the left axes. R1 is the right axis, T1 is the top axis and
6173		// B1 is the bottom axis
6174		// There are also 4 quadrant-like locations (left to right instead of clockwise) reserved for chart overlays
6175		// These locations are single-box locations only, when trying to register a chartArea location that is already taken,
6176		// an error will be thrown.
6177		//
6178		// |----------------------------------------------------|
6179		// |                  T1 (Full Width)                   |
6180		// |----------------------------------------------------|
6181		// |    |    |                 T2                  |    |
6182		// |    |----|-------------------------------------|----|
6183		// |    |    | C1 |                           | C2 |    |
6184		// |    |    |----|                           |----|    |
6185		// |    |    |                                     |    |
6186		// | L1 | L2 |           ChartArea (C0)            | R1 |
6187		// |    |    |                                     |    |
6188		// |    |    |----|                           |----|    |
6189		// |    |    | C3 |                           | C4 |    |
6190		// |    |----|-------------------------------------|----|
6191		// |    |    |                 B1                  |    |
6192		// |----------------------------------------------------|
6193		// |                  B2 (Full Width)                   |
6194		// |----------------------------------------------------|
6195		//
6196		// What we do to find the best sizing, we do the following
6197		// 1. Determine the minimum size of the chart area.
6198		// 2. Split the remaining width equally between each vertical axis
6199		// 3. Split the remaining height equally between each horizontal axis
6200		// 4. Give each layout the maximum size it can be. The layout will return it's minimum size
6201		// 5. Adjust the sizes of each axis based on it's minimum reported size.
6202		// 6. Refit each axis
6203		// 7. Position each axis in the final location
6204		// 8. Tell the chart the final location of the chart area
6205		// 9. Tell any axes that overlay the chart area the positions of the chart area
6206
6207		// Step 1
6208		var chartWidth = width - leftPadding - rightPadding;
6209		var chartHeight = height - topPadding - bottomPadding;
6210		var chartAreaWidth = chartWidth / 2; // min 50%
6211		var chartAreaHeight = chartHeight / 2; // min 50%
6212
6213		// Step 2
6214		var verticalBoxWidth = (width - chartAreaWidth) / (leftBoxes.length + rightBoxes.length);
6215
6216		// Step 3
6217		var horizontalBoxHeight = (height - chartAreaHeight) / (topBoxes.length + bottomBoxes.length);
6218
6219		// Step 4
6220		var maxChartAreaWidth = chartWidth;
6221		var maxChartAreaHeight = chartHeight;
6222		var minBoxSizes = [];
6223
6224		function getMinimumBoxSize(box) {
6225			var minSize;
6226			var isHorizontal = box.isHorizontal();
6227
6228			if (isHorizontal) {
6229				minSize = box.update(box.fullWidth ? chartWidth : maxChartAreaWidth, horizontalBoxHeight);
6230				maxChartAreaHeight -= minSize.height;
6231			} else {
6232				minSize = box.update(verticalBoxWidth, maxChartAreaHeight);
6233				maxChartAreaWidth -= minSize.width;
6234			}
6235
6236			minBoxSizes.push({
6237				horizontal: isHorizontal,
6238				minSize: minSize,
6239				box: box,
6240			});
6241		}
6242
6243		helpers$1.each(leftBoxes.concat(rightBoxes, topBoxes, bottomBoxes), getMinimumBoxSize);
6244
6245		// If a horizontal box has padding, we move the left boxes over to avoid ugly charts (see issue #2478)
6246		var maxHorizontalLeftPadding = 0;
6247		var maxHorizontalRightPadding = 0;
6248		var maxVerticalTopPadding = 0;
6249		var maxVerticalBottomPadding = 0;
6250
6251		helpers$1.each(topBoxes.concat(bottomBoxes), function(horizontalBox) {
6252			if (horizontalBox.getPadding) {
6253				var boxPadding = horizontalBox.getPadding();
6254				maxHorizontalLeftPadding = Math.max(maxHorizontalLeftPadding, boxPadding.left);
6255				maxHorizontalRightPadding = Math.max(maxHorizontalRightPadding, boxPadding.right);
6256			}
6257		});
6258
6259		helpers$1.each(leftBoxes.concat(rightBoxes), function(verticalBox) {
6260			if (verticalBox.getPadding) {
6261				var boxPadding = verticalBox.getPadding();
6262				maxVerticalTopPadding = Math.max(maxVerticalTopPadding, boxPadding.top);
6263				maxVerticalBottomPadding = Math.max(maxVerticalBottomPadding, boxPadding.bottom);
6264			}
6265		});
6266
6267		// At this point, maxChartAreaHeight and maxChartAreaWidth are the size the chart area could
6268		// be if the axes are drawn at their minimum sizes.
6269		// Steps 5 & 6
6270		var totalLeftBoxesWidth = leftPadding;
6271		var totalRightBoxesWidth = rightPadding;
6272		var totalTopBoxesHeight = topPadding;
6273		var totalBottomBoxesHeight = bottomPadding;
6274
6275		// Function to fit a box
6276		function fitBox(box) {
6277			var minBoxSize = helpers$1.findNextWhere(minBoxSizes, function(minBox) {
6278				return minBox.box === box;
6279			});
6280
6281			if (minBoxSize) {
6282				if (box.isHorizontal()) {
6283					var scaleMargin = {
6284						left: Math.max(totalLeftBoxesWidth, maxHorizontalLeftPadding),
6285						right: Math.max(totalRightBoxesWidth, maxHorizontalRightPadding),
6286						top: 0,
6287						bottom: 0
6288					};
6289
6290					// Don't use min size here because of label rotation. When the labels are rotated, their rotation highly depends
6291					// on the margin. Sometimes they need to increase in size slightly
6292					box.update(box.fullWidth ? chartWidth : maxChartAreaWidth, chartHeight / 2, scaleMargin);
6293				} else {
6294					box.update(minBoxSize.minSize.width, maxChartAreaHeight);
6295				}
6296			}
6297		}
6298
6299		// Update, and calculate the left and right margins for the horizontal boxes
6300		helpers$1.each(leftBoxes.concat(rightBoxes), fitBox);
6301
6302		helpers$1.each(leftBoxes, function(box) {
6303			totalLeftBoxesWidth += box.width;
6304		});
6305
6306		helpers$1.each(rightBoxes, function(box) {
6307			totalRightBoxesWidth += box.width;
6308		});
6309
6310		// Set the Left and Right margins for the horizontal boxes
6311		helpers$1.each(topBoxes.concat(bottomBoxes), fitBox);
6312
6313		// Figure out how much margin is on the top and bottom of the vertical boxes
6314		helpers$1.each(topBoxes, function(box) {
6315			totalTopBoxesHeight += box.height;
6316		});
6317
6318		helpers$1.each(bottomBoxes, function(box) {
6319			totalBottomBoxesHeight += box.height;
6320		});
6321
6322		function finalFitVerticalBox(box) {
6323			var minBoxSize = helpers$1.findNextWhere(minBoxSizes, function(minSize) {
6324				return minSize.box === box;
6325			});
6326
6327			var scaleMargin = {
6328				left: 0,
6329				right: 0,
6330				top: totalTopBoxesHeight,
6331				bottom: totalBottomBoxesHeight
6332			};
6333
6334			if (minBoxSize) {
6335				box.update(minBoxSize.minSize.width, maxChartAreaHeight, scaleMargin);
6336			}
6337		}
6338
6339		// Let the left layout know the final margin
6340		helpers$1.each(leftBoxes.concat(rightBoxes), finalFitVerticalBox);
6341
6342		// Recalculate because the size of each layout might have changed slightly due to the margins (label rotation for instance)
6343		totalLeftBoxesWidth = leftPadding;
6344		totalRightBoxesWidth = rightPadding;
6345		totalTopBoxesHeight = topPadding;
6346		totalBottomBoxesHeight = bottomPadding;
6347
6348		helpers$1.each(leftBoxes, function(box) {
6349			totalLeftBoxesWidth += box.width;
6350		});
6351
6352		helpers$1.each(rightBoxes, function(box) {
6353			totalRightBoxesWidth += box.width;
6354		});
6355
6356		helpers$1.each(topBoxes, function(box) {
6357			totalTopBoxesHeight += box.height;
6358		});
6359		helpers$1.each(bottomBoxes, function(box) {
6360			totalBottomBoxesHeight += box.height;
6361		});
6362
6363		// We may be adding some padding to account for rotated x axis labels
6364		var leftPaddingAddition = Math.max(maxHorizontalLeftPadding - totalLeftBoxesWidth, 0);
6365		totalLeftBoxesWidth += leftPaddingAddition;
6366		totalRightBoxesWidth += Math.max(maxHorizontalRightPadding - totalRightBoxesWidth, 0);
6367
6368		var topPaddingAddition = Math.max(maxVerticalTopPadding - totalTopBoxesHeight, 0);
6369		totalTopBoxesHeight += topPaddingAddition;
6370		totalBottomBoxesHeight += Math.max(maxVerticalBottomPadding - totalBottomBoxesHeight, 0);
6371
6372		// Figure out if our chart area changed. This would occur if the dataset layout label rotation
6373		// changed due to the application of the margins in step 6. Since we can only get bigger, this is safe to do
6374		// without calling `fit` again
6375		var newMaxChartAreaHeight = height - totalTopBoxesHeight - totalBottomBoxesHeight;
6376		var newMaxChartAreaWidth = width - totalLeftBoxesWidth - totalRightBoxesWidth;
6377
6378		if (newMaxChartAreaWidth !== maxChartAreaWidth || newMaxChartAreaHeight !== maxChartAreaHeight) {
6379			helpers$1.each(leftBoxes, function(box) {
6380				box.height = newMaxChartAreaHeight;
6381			});
6382
6383			helpers$1.each(rightBoxes, function(box) {
6384				box.height = newMaxChartAreaHeight;
6385			});
6386
6387			helpers$1.each(topBoxes, function(box) {
6388				if (!box.fullWidth) {
6389					box.width = newMaxChartAreaWidth;
6390				}
6391			});
6392
6393			helpers$1.each(bottomBoxes, function(box) {
6394				if (!box.fullWidth) {
6395					box.width = newMaxChartAreaWidth;
6396				}
6397			});
6398
6399			maxChartAreaHeight = newMaxChartAreaHeight;
6400			maxChartAreaWidth = newMaxChartAreaWidth;
6401		}
6402
6403		// Step 7 - Position the boxes
6404		var left = leftPadding + leftPaddingAddition;
6405		var top = topPadding + topPaddingAddition;
6406
6407		function placeBox(box) {
6408			if (box.isHorizontal()) {
6409				box.left = box.fullWidth ? leftPadding : totalLeftBoxesWidth;
6410				box.right = box.fullWidth ? width - rightPadding : totalLeftBoxesWidth + maxChartAreaWidth;
6411				box.top = top;
6412				box.bottom = top + box.height;
6413
6414				// Move to next point
6415				top = box.bottom;
6416
6417			} else {
6418
6419				box.left = left;
6420				box.right = left + box.width;
6421				box.top = totalTopBoxesHeight;
6422				box.bottom = totalTopBoxesHeight + maxChartAreaHeight;
6423
6424				// Move to next point
6425				left = box.right;
6426			}
6427		}
6428
6429		helpers$1.each(leftBoxes.concat(topBoxes), placeBox);
6430
6431		// Account for chart width and height
6432		left += maxChartAreaWidth;
6433		top += maxChartAreaHeight;
6434
6435		helpers$1.each(rightBoxes, placeBox);
6436		helpers$1.each(bottomBoxes, placeBox);
6437
6438		// Step 8
6439		chart.chartArea = {
6440			left: totalLeftBoxesWidth,
6441			top: totalTopBoxesHeight,
6442			right: totalLeftBoxesWidth + maxChartAreaWidth,
6443			bottom: totalTopBoxesHeight + maxChartAreaHeight
6444		};
6445
6446		// Step 9
6447		helpers$1.each(chartAreaBoxes, function(box) {
6448			box.left = chart.chartArea.left;
6449			box.top = chart.chartArea.top;
6450			box.right = chart.chartArea.right;
6451			box.bottom = chart.chartArea.bottom;
6452
6453			box.update(maxChartAreaWidth, maxChartAreaHeight);
6454		});
6455	}
6456};
6457
6458/**
6459 * Platform fallback implementation (minimal).
6460 * @see https://github.com/chartjs/Chart.js/pull/4591#issuecomment-319575939
6461 */
6462
6463var platform_basic = {
6464	acquireContext: function(item) {
6465		if (item && item.canvas) {
6466			// Support for any object associated to a canvas (including a context2d)
6467			item = item.canvas;
6468		}
6469
6470		return item && item.getContext('2d') || null;
6471	}
6472};
6473
6474var EXPANDO_KEY = '$chartjs';
6475var CSS_PREFIX = 'chartjs-';
6476var CSS_RENDER_MONITOR = CSS_PREFIX + 'render-monitor';
6477var CSS_RENDER_ANIMATION = CSS_PREFIX + 'render-animation';
6478var ANIMATION_START_EVENTS = ['animationstart', 'webkitAnimationStart'];
6479
6480/**
6481 * DOM event types -> Chart.js event types.
6482 * Note: only events with different types are mapped.
6483 * @see https://developer.mozilla.org/en-US/docs/Web/Events
6484 */
6485var EVENT_TYPES = {
6486	touchstart: 'mousedown',
6487	touchmove: 'mousemove',
6488	touchend: 'mouseup',
6489	pointerenter: 'mouseenter',
6490	pointerdown: 'mousedown',
6491	pointermove: 'mousemove',
6492	pointerup: 'mouseup',
6493	pointerleave: 'mouseout',
6494	pointerout: 'mouseout'
6495};
6496
6497/**
6498 * The "used" size is the final value of a dimension property after all calculations have
6499 * been performed. This method uses the computed style of `element` but returns undefined
6500 * if the computed style is not expressed in pixels. That can happen in some cases where
6501 * `element` has a size relative to its parent and this last one is not yet displayed,
6502 * for example because of `display: none` on a parent node.
6503 * @see https://developer.mozilla.org/en-US/docs/Web/CSS/used_value
6504 * @returns {Number} Size in pixels or undefined if unknown.
6505 */
6506function readUsedSize(element, property) {
6507	var value = helpers$1.getStyle(element, property);
6508	var matches = value && value.match(/^(\d+)(\.\d+)?px$/);
6509	return matches ? Number(matches[1]) : undefined;
6510}
6511
6512/**
6513 * Initializes the canvas style and render size without modifying the canvas display size,
6514 * since responsiveness is handled by the controller.resize() method. The config is used
6515 * to determine the aspect ratio to apply in case no explicit height has been specified.
6516 */
6517function initCanvas(canvas, config) {
6518	var style = canvas.style;
6519
6520	// NOTE(SB) canvas.getAttribute('width') !== canvas.width: in the first case it
6521	// returns null or '' if no explicit value has been set to the canvas attribute.
6522	var renderHeight = canvas.getAttribute('height');
6523	var renderWidth = canvas.getAttribute('width');
6524
6525	// Chart.js modifies some canvas values that we want to restore on destroy
6526	canvas[EXPANDO_KEY] = {
6527		initial: {
6528			height: renderHeight,
6529			width: renderWidth,
6530			style: {
6531				display: style.display,
6532				height: style.height,
6533				width: style.width
6534			}
6535		}
6536	};
6537
6538	// Force canvas to display as block to avoid extra space caused by inline
6539	// elements, which would interfere with the responsive resize process.
6540	// https://github.com/chartjs/Chart.js/issues/2538
6541	style.display = style.display || 'block';
6542
6543	if (renderWidth === null || renderWidth === '') {
6544		var displayWidth = readUsedSize(canvas, 'width');
6545		if (displayWidth !== undefined) {
6546			canvas.width = displayWidth;
6547		}
6548	}
6549
6550	if (renderHeight === null || renderHeight === '') {
6551		if (canvas.style.height === '') {
6552			// If no explicit render height and style height, let's apply the aspect ratio,
6553			// which one can be specified by the user but also by charts as default option
6554			// (i.e. options.aspectRatio). If not specified, use canvas aspect ratio of 2.
6555			canvas.height = canvas.width / (config.options.aspectRatio || 2);
6556		} else {
6557			var displayHeight = readUsedSize(canvas, 'height');
6558			if (displayWidth !== undefined) {
6559				canvas.height = displayHeight;
6560			}
6561		}
6562	}
6563
6564	return canvas;
6565}
6566
6567/**
6568 * Detects support for options object argument in addEventListener.
6569 * https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
6570 * @private
6571 */
6572var supportsEventListenerOptions = (function() {
6573	var supports = false;
6574	try {
6575		var options = Object.defineProperty({}, 'passive', {
6576			// eslint-disable-next-line getter-return
6577			get: function() {
6578				supports = true;
6579			}
6580		});
6581		window.addEventListener('e', null, options);
6582	} catch (e) {
6583		// continue regardless of error
6584	}
6585	return supports;
6586}());
6587
6588// Default passive to true as expected by Chrome for 'touchstart' and 'touchend' events.
6589// https://github.com/chartjs/Chart.js/issues/4287
6590var eventListenerOptions = supportsEventListenerOptions ? {passive: true} : false;
6591
6592function addEventListener(node, type, listener) {
6593	node.addEventListener(type, listener, eventListenerOptions);
6594}
6595
6596function removeEventListener(node, type, listener) {
6597	node.removeEventListener(type, listener, eventListenerOptions);
6598}
6599
6600function createEvent(type, chart, x, y, nativeEvent) {
6601	return {
6602		type: type,
6603		chart: chart,
6604		native: nativeEvent || null,
6605		x: x !== undefined ? x : null,
6606		y: y !== undefined ? y : null,
6607	};
6608}
6609
6610function fromNativeEvent(event, chart) {
6611	var type = EVENT_TYPES[event.type] || event.type;
6612	var pos = helpers$1.getRelativePosition(event, chart);
6613	return createEvent(type, chart, pos.x, pos.y, event);
6614}
6615
6616function throttled(fn, thisArg) {
6617	var ticking = false;
6618	var args = [];
6619
6620	return function() {
6621		args = Array.prototype.slice.call(arguments);
6622		thisArg = thisArg || this;
6623
6624		if (!ticking) {
6625			ticking = true;
6626			helpers$1.requestAnimFrame.call(window, function() {
6627				ticking = false;
6628				fn.apply(thisArg, args);
6629			});
6630		}
6631	};
6632}
6633
6634function createDiv(cls, style) {
6635	var el = document.createElement('div');
6636	el.style.cssText = style || '';
6637	el.className = cls || '';
6638	return el;
6639}
6640
6641// Implementation based on https://github.com/marcj/css-element-queries
6642function createResizer(handler) {
6643	var cls = CSS_PREFIX + 'size-monitor';
6644	var maxSize = 1000000;
6645	var style =
6646		'position:absolute;' +
6647		'left:0;' +
6648		'top:0;' +
6649		'right:0;' +
6650		'bottom:0;' +
6651		'overflow:hidden;' +
6652		'pointer-events:none;' +
6653		'visibility:hidden;' +
6654		'z-index:-1;';
6655
6656	// NOTE(SB) Don't use innerHTML because it could be considered unsafe.
6657	// https://github.com/chartjs/Chart.js/issues/5902
6658	var resizer = createDiv(cls, style);
6659	var expand = createDiv(cls + '-expand', style);
6660	var shrink = createDiv(cls + '-shrink', style);
6661
6662	expand.appendChild(createDiv('',
6663		'position:absolute;' +
6664		'height:' + maxSize + 'px;' +
6665		'width:' + maxSize + 'px;' +
6666		'left:0;' +
6667		'top:0;'
6668	));
6669	shrink.appendChild(createDiv('',
6670		'position:absolute;' +
6671		'height:200%;' +
6672		'width:200%;' +
6673		'left:0;' +
6674		'top:0;'
6675	));
6676
6677	resizer.appendChild(expand);
6678	resizer.appendChild(shrink);
6679	resizer._reset = function() {
6680		expand.scrollLeft = maxSize;
6681		expand.scrollTop = maxSize;
6682		shrink.scrollLeft = maxSize;
6683		shrink.scrollTop = maxSize;
6684	};
6685
6686	var onScroll = function() {
6687		resizer._reset();
6688		handler();
6689	};
6690
6691	addEventListener(expand, 'scroll', onScroll.bind(expand, 'expand'));
6692	addEventListener(shrink, 'scroll', onScroll.bind(shrink, 'shrink'));
6693
6694	return resizer;
6695}
6696
6697// https://davidwalsh.name/detect-node-insertion
6698function watchForRender(node, handler) {
6699	var expando = node[EXPANDO_KEY] || (node[EXPANDO_KEY] = {});
6700	var proxy = expando.renderProxy = function(e) {
6701		if (e.animationName === CSS_RENDER_ANIMATION) {
6702			handler();
6703		}
6704	};
6705
6706	helpers$1.each(ANIMATION_START_EVENTS, function(type) {
6707		addEventListener(node, type, proxy);
6708	});
6709
6710	// #4737: Chrome might skip the CSS animation when the CSS_RENDER_MONITOR class
6711	// is removed then added back immediately (same animation frame?). Accessing the
6712	// `offsetParent` property will force a reflow and re-evaluate the CSS animation.
6713	// https://gist.github.com/paulirish/5d52fb081b3570c81e3a#box-metrics
6714	// https://github.com/chartjs/Chart.js/issues/4737
6715	expando.reflow = !!node.offsetParent;
6716
6717	node.classList.add(CSS_RENDER_MONITOR);
6718}
6719
6720function unwatchForRender(node) {
6721	var expando = node[EXPANDO_KEY] || {};
6722	var proxy = expando.renderProxy;
6723
6724	if (proxy) {
6725		helpers$1.each(ANIMATION_START_EVENTS, function(type) {
6726			removeEventListener(node, type, proxy);
6727		});
6728
6729		delete expando.renderProxy;
6730	}
6731
6732	node.classList.remove(CSS_RENDER_MONITOR);
6733}
6734
6735function addResizeListener(node, listener, chart) {
6736	var expando = node[EXPANDO_KEY] || (node[EXPANDO_KEY] = {});
6737
6738	// Let's keep track of this added resizer and thus avoid DOM query when removing it.
6739	var resizer = expando.resizer = createResizer(throttled(function() {
6740		if (expando.resizer) {
6741			return listener(createEvent('resize', chart));
6742		}
6743	}));
6744
6745	// The resizer needs to be attached to the node parent, so we first need to be
6746	// sure that `node` is attached to the DOM before injecting the resizer element.
6747	watchForRender(node, function() {
6748		if (expando.resizer) {
6749			var container = node.parentNode;
6750			if (container && container !== resizer.parentNode) {
6751				container.insertBefore(resizer, container.firstChild);
6752			}
6753
6754			// The container size might have changed, let's reset the resizer state.
6755			resizer._reset();
6756		}
6757	});
6758}
6759
6760function removeResizeListener(node) {
6761	var expando = node[EXPANDO_KEY] || {};
6762	var resizer = expando.resizer;
6763
6764	delete expando.resizer;
6765	unwatchForRender(node);
6766
6767	if (resizer && resizer.parentNode) {
6768		resizer.parentNode.removeChild(resizer);
6769	}
6770}
6771
6772function injectCSS(platform, css) {
6773	// https://stackoverflow.com/q/3922139
6774	var style = platform._style || document.createElement('style');
6775	if (!platform._style) {
6776		platform._style = style;
6777		css = '/* Chart.js */\n' + css;
6778		style.setAttribute('type', 'text/css');
6779		document.getElementsByTagName('head')[0].appendChild(style);
6780	}
6781
6782	style.appendChild(document.createTextNode(css));
6783}
6784
6785var platform_dom = {
6786	/**
6787	 * This property holds whether this platform is enabled for the current environment.
6788	 * Currently used by platform.js to select the proper implementation.
6789	 * @private
6790	 */
6791	_enabled: typeof window !== 'undefined' && typeof document !== 'undefined',
6792
6793	initialize: function() {
6794		var keyframes = 'from{opacity:0.99}to{opacity:1}';
6795
6796		injectCSS(this,
6797			// DOM rendering detection
6798			// https://davidwalsh.name/detect-node-insertion
6799			'@-webkit-keyframes ' + CSS_RENDER_ANIMATION + '{' + keyframes + '}' +
6800			'@keyframes ' + CSS_RENDER_ANIMATION + '{' + keyframes + '}' +
6801			'.' + CSS_RENDER_MONITOR + '{' +
6802				'-webkit-animation:' + CSS_RENDER_ANIMATION + ' 0.001s;' +
6803				'animation:' + CSS_RENDER_ANIMATION + ' 0.001s;' +
6804			'}'
6805		);
6806	},
6807
6808	acquireContext: function(item, config) {
6809		if (typeof item === 'string') {
6810			item = document.getElementById(item);
6811		} else if (item.length) {
6812			// Support for array based queries (such as jQuery)
6813			item = item[0];
6814		}
6815
6816		if (item && item.canvas) {
6817			// Support for any object associated to a canvas (including a context2d)
6818			item = item.canvas;
6819		}
6820
6821		// To prevent canvas fingerprinting, some add-ons undefine the getContext
6822		// method, for example: https://github.com/kkapsner/CanvasBlocker
6823		// https://github.com/chartjs/Chart.js/issues/2807
6824		var context = item && item.getContext && item.getContext('2d');
6825
6826		// `instanceof HTMLCanvasElement/CanvasRenderingContext2D` fails when the item is
6827		// inside an iframe or when running in a protected environment. We could guess the
6828		// types from their toString() value but let's keep things flexible and assume it's
6829		// a sufficient condition if the item has a context2D which has item as `canvas`.
6830		// https://github.com/chartjs/Chart.js/issues/3887
6831		// https://github.com/chartjs/Chart.js/issues/4102
6832		// https://github.com/chartjs/Chart.js/issues/4152
6833		if (context && context.canvas === item) {
6834			initCanvas(item, config);
6835			return context;
6836		}
6837
6838		return null;
6839	},
6840
6841	releaseContext: function(context) {
6842		var canvas = context.canvas;
6843		if (!canvas[EXPANDO_KEY]) {
6844			return;
6845		}
6846
6847		var initial = canvas[EXPANDO_KEY].initial;
6848		['height', 'width'].forEach(function(prop) {
6849			var value = initial[prop];
6850			if (helpers$1.isNullOrUndef(value)) {
6851				canvas.removeAttribute(prop);
6852			} else {
6853				canvas.setAttribute(prop, value);
6854			}
6855		});
6856
6857		helpers$1.each(initial.style || {}, function(value, key) {
6858			canvas.style[key] = value;
6859		});
6860
6861		// The canvas render size might have been changed (and thus the state stack discarded),
6862		// we can't use save() and restore() to restore the initial state. So make sure that at
6863		// least the canvas context is reset to the default state by setting the canvas width.
6864		// https://www.w3.org/TR/2011/WD-html5-20110525/the-canvas-element.html
6865		// eslint-disable-next-line no-self-assign
6866		canvas.width = canvas.width;
6867
6868		delete canvas[EXPANDO_KEY];
6869	},
6870
6871	addEventListener: function(chart, type, listener) {
6872		var canvas = chart.canvas;
6873		if (type === 'resize') {
6874			// Note: the resize event is not supported on all browsers.
6875			addResizeListener(canvas, listener, chart);
6876			return;
6877		}
6878
6879		var expando = listener[EXPANDO_KEY] || (listener[EXPANDO_KEY] = {});
6880		var proxies = expando.proxies || (expando.proxies = {});
6881		var proxy = proxies[chart.id + '_' + type] = function(event) {
6882			listener(fromNativeEvent(event, chart));
6883		};
6884
6885		addEventListener(canvas, type, proxy);
6886	},
6887
6888	removeEventListener: function(chart, type, listener) {
6889		var canvas = chart.canvas;
6890		if (type === 'resize') {
6891			// Note: the resize event is not supported on all browsers.
6892			removeResizeListener(canvas);
6893			return;
6894		}
6895
6896		var expando = listener[EXPANDO_KEY] || {};
6897		var proxies = expando.proxies || {};
6898		var proxy = proxies[chart.id + '_' + type];
6899		if (!proxy) {
6900			return;
6901		}
6902
6903		removeEventListener(canvas, type, proxy);
6904	}
6905};
6906
6907// DEPRECATIONS
6908
6909/**
6910 * Provided for backward compatibility, use EventTarget.addEventListener instead.
6911 * EventTarget.addEventListener compatibility: Chrome, Opera 7, Safari, FF1.5+, IE9+
6912 * @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener
6913 * @function Chart.helpers.addEvent
6914 * @deprecated since version 2.7.0
6915 * @todo remove at version 3
6916 * @private
6917 */
6918helpers$1.addEvent = addEventListener;
6919
6920/**
6921 * Provided for backward compatibility, use EventTarget.removeEventListener instead.
6922 * EventTarget.removeEventListener compatibility: Chrome, Opera 7, Safari, FF1.5+, IE9+
6923 * @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener
6924 * @function Chart.helpers.removeEvent
6925 * @deprecated since version 2.7.0
6926 * @todo remove at version 3
6927 * @private
6928 */
6929helpers$1.removeEvent = removeEventListener;
6930
6931// @TODO Make possible to select another platform at build time.
6932var implementation = platform_dom._enabled ? platform_dom : platform_basic;
6933
6934/**
6935 * @namespace Chart.platform
6936 * @see https://chartjs.gitbooks.io/proposals/content/Platform.html
6937 * @since 2.4.0
6938 */
6939var platform = helpers$1.extend({
6940	/**
6941	 * @since 2.7.0
6942	 */
6943	initialize: function() {},
6944
6945	/**
6946	 * Called at chart construction time, returns a context2d instance implementing
6947	 * the [W3C Canvas 2D Context API standard]{@link https://www.w3.org/TR/2dcontext/}.
6948	 * @param {*} item - The native item from which to acquire context (platform specific)
6949	 * @param {Object} options - The chart options
6950	 * @returns {CanvasRenderingContext2D} context2d instance
6951	 */
6952	acquireContext: function() {},
6953
6954	/**
6955	 * Called at chart destruction time, releases any resources associated to the context
6956	 * previously returned by the acquireContext() method.
6957	 * @param {CanvasRenderingContext2D} context - The context2d instance
6958	 * @returns {Boolean} true if the method succeeded, else false
6959	 */
6960	releaseContext: function() {},
6961
6962	/**
6963	 * Registers the specified listener on the given chart.
6964	 * @param {Chart} chart - Chart from which to listen for event
6965	 * @param {String} type - The ({@link IEvent}) type to listen for
6966	 * @param {Function} listener - Receives a notification (an object that implements
6967	 * the {@link IEvent} interface) when an event of the specified type occurs.
6968	 */
6969	addEventListener: function() {},
6970
6971	/**
6972	 * Removes the specified listener previously registered with addEventListener.
6973	 * @param {Chart} chart -Chart from which to remove the listener
6974	 * @param {String} type - The ({@link IEvent}) type to remove
6975	 * @param {Function} listener - The listener function to remove from the event target.
6976	 */
6977	removeEventListener: function() {}
6978
6979}, implementation);
6980
6981core_defaults._set('global', {
6982	plugins: {}
6983});
6984
6985/**
6986 * The plugin service singleton
6987 * @namespace Chart.plugins
6988 * @since 2.1.0
6989 */
6990var core_plugins = {
6991	/**
6992	 * Globally registered plugins.
6993	 * @private
6994	 */
6995	_plugins: [],
6996
6997	/**
6998	 * This identifier is used to invalidate the descriptors cache attached to each chart
6999	 * when a global plugin is registered or unregistered. In this case, the cache ID is
7000	 * incremented and descriptors are regenerated during following API calls.
7001	 * @private
7002	 */
7003	_cacheId: 0,
7004
7005	/**
7006	 * Registers the given plugin(s) if not already registered.
7007	 * @param {Array|Object} plugins plugin instance(s).
7008	 */
7009	register: function(plugins) {
7010		var p = this._plugins;
7011		([]).concat(plugins).forEach(function(plugin) {
7012			if (p.indexOf(plugin) === -1) {
7013				p.push(plugin);
7014			}
7015		});
7016
7017		this._cacheId++;
7018	},
7019
7020	/**
7021	 * Unregisters the given plugin(s) only if registered.
7022	 * @param {Array|Object} plugins plugin instance(s).
7023	 */
7024	unregister: function(plugins) {
7025		var p = this._plugins;
7026		([]).concat(plugins).forEach(function(plugin) {
7027			var idx = p.indexOf(plugin);
7028			if (idx !== -1) {
7029				p.splice(idx, 1);
7030			}
7031		});
7032
7033		this._cacheId++;
7034	},
7035
7036	/**
7037	 * Remove all registered plugins.
7038	 * @since 2.1.5
7039	 */
7040	clear: function() {
7041		this._plugins = [];
7042		this._cacheId++;
7043	},
7044
7045	/**
7046	 * Returns the number of registered plugins?
7047	 * @returns {Number}
7048	 * @since 2.1.5
7049	 */
7050	count: function() {
7051		return this._plugins.length;
7052	},
7053
7054	/**
7055	 * Returns all registered plugin instances.
7056	 * @returns {Array} array of plugin objects.
7057	 * @since 2.1.5
7058	 */
7059	getAll: function() {
7060		return this._plugins;
7061	},
7062
7063	/**
7064	 * Calls enabled plugins for `chart` on the specified hook and with the given args.
7065	 * This method immediately returns as soon as a plugin explicitly returns false. The
7066	 * returned value can be used, for instance, to interrupt the current action.
7067	 * @param {Object} chart - The chart instance for which plugins should be called.
7068	 * @param {String} hook - The name of the plugin method to call (e.g. 'beforeUpdate').
7069	 * @param {Array} [args] - Extra arguments to apply to the hook call.
7070	 * @returns {Boolean} false if any of the plugins return false, else returns true.
7071	 */
7072	notify: function(chart, hook, args) {
7073		var descriptors = this.descriptors(chart);
7074		var ilen = descriptors.length;
7075		var i, descriptor, plugin, params, method;
7076
7077		for (i = 0; i < ilen; ++i) {
7078			descriptor = descriptors[i];
7079			plugin = descriptor.plugin;
7080			method = plugin[hook];
7081			if (typeof method === 'function') {
7082				params = [chart].concat(args || []);
7083				params.push(descriptor.options);
7084				if (method.apply(plugin, params) === false) {
7085					return false;
7086				}
7087			}
7088		}
7089
7090		return true;
7091	},
7092
7093	/**
7094	 * Returns descriptors of enabled plugins for the given chart.
7095	 * @returns {Array} [{ plugin, options }]
7096	 * @private
7097	 */
7098	descriptors: function(chart) {
7099		var cache = chart.$plugins || (chart.$plugins = {});
7100		if (cache.id === this._cacheId) {
7101			return cache.descriptors;
7102		}
7103
7104		var plugins = [];
7105		var descriptors = [];
7106		var config = (chart && chart.config) || {};
7107		var options = (config.options && config.options.plugins) || {};
7108
7109		this._plugins.concat(config.plugins || []).forEach(function(plugin) {
7110			var idx = plugins.indexOf(plugin);
7111			if (idx !== -1) {
7112				return;
7113			}
7114
7115			var id = plugin.id;
7116			var opts = options[id];
7117			if (opts === false) {
7118				return;
7119			}
7120
7121			if (opts === true) {
7122				opts = helpers$1.clone(core_defaults.global.plugins[id]);
7123			}
7124
7125			plugins.push(plugin);
7126			descriptors.push({
7127				plugin: plugin,
7128				options: opts || {}
7129			});
7130		});
7131
7132		cache.descriptors = descriptors;
7133		cache.id = this._cacheId;
7134		return descriptors;
7135	},
7136
7137	/**
7138	 * Invalidates cache for the given chart: descriptors hold a reference on plugin option,
7139	 * but in some cases, this reference can be changed by the user when updating options.
7140	 * https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167
7141	 * @private
7142	 */
7143	_invalidate: function(chart) {
7144		delete chart.$plugins;
7145	}
7146};
7147
7148var core_scaleService = {
7149	// Scale registration object. Extensions can register new scale types (such as log or DB scales) and then
7150	// use the new chart options to grab the correct scale
7151	constructors: {},
7152	// Use a registration function so that we can move to an ES6 map when we no longer need to support
7153	// old browsers
7154
7155	// Scale config defaults
7156	defaults: {},
7157	registerScaleType: function(type, scaleConstructor, scaleDefaults) {
7158		this.constructors[type] = scaleConstructor;
7159		this.defaults[type] = helpers$1.clone(scaleDefaults);
7160	},
7161	getScaleConstructor: function(type) {
7162		return this.constructors.hasOwnProperty(type) ? this.constructors[type] : undefined;
7163	},
7164	getScaleDefaults: function(type) {
7165		// Return the scale defaults merged with the global settings so that we always use the latest ones
7166		return this.defaults.hasOwnProperty(type) ? helpers$1.merge({}, [core_defaults.scale, this.defaults[type]]) : {};
7167	},
7168	updateScaleDefaults: function(type, additions) {
7169		var me = this;
7170		if (me.defaults.hasOwnProperty(type)) {
7171			me.defaults[type] = helpers$1.extend(me.defaults[type], additions);
7172		}
7173	},
7174	addScalesToLayout: function(chart) {
7175		// Adds each scale to the chart.boxes array to be sized accordingly
7176		helpers$1.each(chart.scales, function(scale) {
7177			// Set ILayoutItem parameters for backwards compatibility
7178			scale.fullWidth = scale.options.fullWidth;
7179			scale.position = scale.options.position;
7180			scale.weight = scale.options.weight;
7181			core_layouts.addBox(chart, scale);
7182		});
7183	}
7184};
7185
7186var valueOrDefault$5 = helpers$1.valueOrDefault;
7187
7188core_defaults._set('global', {
7189	tooltips: {
7190		enabled: true,
7191		custom: null,
7192		mode: 'nearest',
7193		position: 'average',
7194		intersect: true,
7195		backgroundColor: 'rgba(0,0,0,0.8)',
7196		titleFontStyle: 'bold',
7197		titleSpacing: 2,
7198		titleMarginBottom: 6,
7199		titleFontColor: '#fff',
7200		titleAlign: 'left',
7201		bodySpacing: 2,
7202		bodyFontColor: '#fff',
7203		bodyAlign: 'left',
7204		footerFontStyle: 'bold',
7205		footerSpacing: 2,
7206		footerMarginTop: 6,
7207		footerFontColor: '#fff',
7208		footerAlign: 'left',
7209		yPadding: 6,
7210		xPadding: 6,
7211		caretPadding: 2,
7212		caretSize: 5,
7213		cornerRadius: 6,
7214		multiKeyBackground: '#fff',
7215		displayColors: true,
7216		borderColor: 'rgba(0,0,0,0)',
7217		borderWidth: 0,
7218		callbacks: {
7219			// Args are: (tooltipItems, data)
7220			beforeTitle: helpers$1.noop,
7221			title: function(tooltipItems, data) {
7222				// Pick first xLabel for now
7223				var title = '';
7224				var labels = data.labels;
7225				var labelCount = labels ? labels.length : 0;
7226
7227				if (tooltipItems.length > 0) {
7228					var item = tooltipItems[0];
7229
7230					if (item.xLabel) {
7231						title = item.xLabel;
7232					} else if (labelCount > 0 && item.index < labelCount) {
7233						title = labels[item.index];
7234					}
7235				}
7236
7237				return title;
7238			},
7239			afterTitle: helpers$1.noop,
7240
7241			// Args are: (tooltipItems, data)
7242			beforeBody: helpers$1.noop,
7243
7244			// Args are: (tooltipItem, data)
7245			beforeLabel: helpers$1.noop,
7246			label: function(tooltipItem, data) {
7247				var label = data.datasets[tooltipItem.datasetIndex].label || '';
7248
7249				if (label) {
7250					label += ': ';
7251				}
7252				label += tooltipItem.yLabel;
7253				return label;
7254			},
7255			labelColor: function(tooltipItem, chart) {
7256				var meta = chart.getDatasetMeta(tooltipItem.datasetIndex);
7257				var activeElement = meta.data[tooltipItem.index];
7258				var view = activeElement._view;
7259				return {
7260					borderColor: view.borderColor,
7261					backgroundColor: view.backgroundColor
7262				};
7263			},
7264			labelTextColor: function() {
7265				return this._options.bodyFontColor;
7266			},
7267			afterLabel: helpers$1.noop,
7268
7269			// Args are: (tooltipItems, data)
7270			afterBody: helpers$1.noop,
7271
7272			// Args are: (tooltipItems, data)
7273			beforeFooter: helpers$1.noop,
7274			footer: helpers$1.noop,
7275			afterFooter: helpers$1.noop
7276		}
7277	}
7278});
7279
7280var positioners = {
7281	/**
7282	 * Average mode places the tooltip at the average position of the elements shown
7283	 * @function Chart.Tooltip.positioners.average
7284	 * @param elements {ChartElement[]} the elements being displayed in the tooltip
7285	 * @returns {Point} tooltip position
7286	 */
7287	average: function(elements) {
7288		if (!elements.length) {
7289			return false;
7290		}
7291
7292		var i, len;
7293		var x = 0;
7294		var y = 0;
7295		var count = 0;
7296
7297		for (i = 0, len = elements.length; i < len; ++i) {
7298			var el = elements[i];
7299			if (el && el.hasValue()) {
7300				var pos = el.tooltipPosition();
7301				x += pos.x;
7302				y += pos.y;
7303				++count;
7304			}
7305		}
7306
7307		return {
7308			x: x / count,
7309			y: y / count
7310		};
7311	},
7312
7313	/**
7314	 * Gets the tooltip position nearest of the item nearest to the event position
7315	 * @function Chart.Tooltip.positioners.nearest
7316	 * @param elements {Chart.Element[]} the tooltip elements
7317	 * @param eventPosition {Point} the position of the event in canvas coordinates
7318	 * @returns {Point} the tooltip position
7319	 */
7320	nearest: function(elements, eventPosition) {
7321		var x = eventPosition.x;
7322		var y = eventPosition.y;
7323		var minDistance = Number.POSITIVE_INFINITY;
7324		var i, len, nearestElement;
7325
7326		for (i = 0, len = elements.length; i < len; ++i) {
7327			var el = elements[i];
7328			if (el && el.hasValue()) {
7329				var center = el.getCenterPoint();
7330				var d = helpers$1.distanceBetweenPoints(eventPosition, center);
7331
7332				if (d < minDistance) {
7333					minDistance = d;
7334					nearestElement = el;
7335				}
7336			}
7337		}
7338
7339		if (nearestElement) {
7340			var tp = nearestElement.tooltipPosition();
7341			x = tp.x;
7342			y = tp.y;
7343		}
7344
7345		return {
7346			x: x,
7347			y: y
7348		};
7349	}
7350};
7351
7352// Helper to push or concat based on if the 2nd parameter is an array or not
7353function pushOrConcat(base, toPush) {
7354	if (toPush) {
7355		if (helpers$1.isArray(toPush)) {
7356			// base = base.concat(toPush);
7357			Array.prototype.push.apply(base, toPush);
7358		} else {
7359			base.push(toPush);
7360		}
7361	}
7362
7363	return base;
7364}
7365
7366/**
7367 * Returns array of strings split by newline
7368 * @param {String} value - The value to split by newline.
7369 * @returns {Array} value if newline present - Returned from String split() method
7370 * @function
7371 */
7372function splitNewlines(str) {
7373	if ((typeof str === 'string' || str instanceof String) && str.indexOf('\n') > -1) {
7374		return str.split('\n');
7375	}
7376	return str;
7377}
7378
7379
7380// Private helper to create a tooltip item model
7381// @param element : the chart element (point, arc, bar) to create the tooltip item for
7382// @return : new tooltip item
7383function createTooltipItem(element) {
7384	var xScale = element._xScale;
7385	var yScale = element._yScale || element._scale; // handle radar || polarArea charts
7386	var index = element._index;
7387	var datasetIndex = element._datasetIndex;
7388
7389	return {
7390		xLabel: xScale ? xScale.getLabelForIndex(index, datasetIndex) : '',
7391		yLabel: yScale ? yScale.getLabelForIndex(index, datasetIndex) : '',
7392		index: index,
7393		datasetIndex: datasetIndex,
7394		x: element._model.x,
7395		y: element._model.y
7396	};
7397}
7398
7399/**
7400 * Helper to get the reset model for the tooltip
7401 * @param tooltipOpts {Object} the tooltip options
7402 */
7403function getBaseModel(tooltipOpts) {
7404	var globalDefaults = core_defaults.global;
7405
7406	return {
7407		// Positioning
7408		xPadding: tooltipOpts.xPadding,
7409		yPadding: tooltipOpts.yPadding,
7410		xAlign: tooltipOpts.xAlign,
7411		yAlign: tooltipOpts.yAlign,
7412
7413		// Body
7414		bodyFontColor: tooltipOpts.bodyFontColor,
7415		_bodyFontFamily: valueOrDefault$5(tooltipOpts.bodyFontFamily, globalDefaults.defaultFontFamily),
7416		_bodyFontStyle: valueOrDefault$5(tooltipOpts.bodyFontStyle, globalDefaults.defaultFontStyle),
7417		_bodyAlign: tooltipOpts.bodyAlign,
7418		bodyFontSize: valueOrDefault$5(tooltipOpts.bodyFontSize, globalDefaults.defaultFontSize),
7419		bodySpacing: tooltipOpts.bodySpacing,
7420
7421		// Title
7422		titleFontColor: tooltipOpts.titleFontColor,
7423		_titleFontFamily: valueOrDefault$5(tooltipOpts.titleFontFamily, globalDefaults.defaultFontFamily),
7424		_titleFontStyle: valueOrDefault$5(tooltipOpts.titleFontStyle, globalDefaults.defaultFontStyle),
7425		titleFontSize: valueOrDefault$5(tooltipOpts.titleFontSize, globalDefaults.defaultFontSize),
7426		_titleAlign: tooltipOpts.titleAlign,
7427		titleSpacing: tooltipOpts.titleSpacing,
7428		titleMarginBottom: tooltipOpts.titleMarginBottom,
7429
7430		// Footer
7431		footerFontColor: tooltipOpts.footerFontColor,
7432		_footerFontFamily: valueOrDefault$5(tooltipOpts.footerFontFamily, globalDefaults.defaultFontFamily),
7433		_footerFontStyle: valueOrDefault$5(tooltipOpts.footerFontStyle, globalDefaults.defaultFontStyle),
7434		footerFontSize: valueOrDefault$5(tooltipOpts.footerFontSize, globalDefaults.defaultFontSize),
7435		_footerAlign: tooltipOpts.footerAlign,
7436		footerSpacing: tooltipOpts.footerSpacing,
7437		footerMarginTop: tooltipOpts.footerMarginTop,
7438
7439		// Appearance
7440		caretSize: tooltipOpts.caretSize,
7441		cornerRadius: tooltipOpts.cornerRadius,
7442		backgroundColor: tooltipOpts.backgroundColor,
7443		opacity: 0,
7444		legendColorBackground: tooltipOpts.multiKeyBackground,
7445		displayColors: tooltipOpts.displayColors,
7446		borderColor: tooltipOpts.borderColor,
7447		borderWidth: tooltipOpts.borderWidth
7448	};
7449}
7450
7451/**
7452 * Get the size of the tooltip
7453 */
7454function getTooltipSize(tooltip, model) {
7455	var ctx = tooltip._chart.ctx;
7456
7457	var height = model.yPadding * 2; // Tooltip Padding
7458	var width = 0;
7459
7460	// Count of all lines in the body
7461	var body = model.body;
7462	var combinedBodyLength = body.reduce(function(count, bodyItem) {
7463		return count + bodyItem.before.length + bodyItem.lines.length + bodyItem.after.length;
7464	}, 0);
7465	combinedBodyLength += model.beforeBody.length + model.afterBody.length;
7466
7467	var titleLineCount = model.title.length;
7468	var footerLineCount = model.footer.length;
7469	var titleFontSize = model.titleFontSize;
7470	var bodyFontSize = model.bodyFontSize;
7471	var footerFontSize = model.footerFontSize;
7472
7473	height += titleLineCount * titleFontSize; // Title Lines
7474	height += titleLineCount ? (titleLineCount - 1) * model.titleSpacing : 0; // Title Line Spacing
7475	height += titleLineCount ? model.titleMarginBottom : 0; // Title's bottom Margin
7476	height += combinedBodyLength * bodyFontSize; // Body Lines
7477	height += combinedBodyLength ? (combinedBodyLength - 1) * model.bodySpacing : 0; // Body Line Spacing
7478	height += footerLineCount ? model.footerMarginTop : 0; // Footer Margin
7479	height += footerLineCount * (footerFontSize); // Footer Lines
7480	height += footerLineCount ? (footerLineCount - 1) * model.footerSpacing : 0; // Footer Line Spacing
7481
7482	// Title width
7483	var widthPadding = 0;
7484	var maxLineWidth = function(line) {
7485		width = Math.max(width, ctx.measureText(line).width + widthPadding);
7486	};
7487
7488	ctx.font = helpers$1.fontString(titleFontSize, model._titleFontStyle, model._titleFontFamily);
7489	helpers$1.each(model.title, maxLineWidth);
7490
7491	// Body width
7492	ctx.font = helpers$1.fontString(bodyFontSize, model._bodyFontStyle, model._bodyFontFamily);
7493	helpers$1.each(model.beforeBody.concat(model.afterBody), maxLineWidth);
7494
7495	// Body lines may include some extra width due to the color box
7496	widthPadding = model.displayColors ? (bodyFontSize + 2) : 0;
7497	helpers$1.each(body, function(bodyItem) {
7498		helpers$1.each(bodyItem.before, maxLineWidth);
7499		helpers$1.each(bodyItem.lines, maxLineWidth);
7500		helpers$1.each(bodyItem.after, maxLineWidth);
7501	});
7502
7503	// Reset back to 0
7504	widthPadding = 0;
7505
7506	// Footer width
7507	ctx.font = helpers$1.fontString(footerFontSize, model._footerFontStyle, model._footerFontFamily);
7508	helpers$1.each(model.footer, maxLineWidth);
7509
7510	// Add padding
7511	width += 2 * model.xPadding;
7512
7513	return {
7514		width: width,
7515		height: height
7516	};
7517}
7518
7519/**
7520 * Helper to get the alignment of a tooltip given the size
7521 */
7522function determineAlignment(tooltip, size) {
7523	var model = tooltip._model;
7524	var chart = tooltip._chart;
7525	var chartArea = tooltip._chart.chartArea;
7526	var xAlign = 'center';
7527	var yAlign = 'center';
7528
7529	if (model.y < size.height) {
7530		yAlign = 'top';
7531	} else if (model.y > (chart.height - size.height)) {
7532		yAlign = 'bottom';
7533	}
7534
7535	var lf, rf; // functions to determine left, right alignment
7536	var olf, orf; // functions to determine if left/right alignment causes tooltip to go outside chart
7537	var yf; // function to get the y alignment if the tooltip goes outside of the left or right edges
7538	var midX = (chartArea.left + chartArea.right) / 2;
7539	var midY = (chartArea.top + chartArea.bottom) / 2;
7540
7541	if (yAlign === 'center') {
7542		lf = function(x) {
7543			return x <= midX;
7544		};
7545		rf = function(x) {
7546			return x > midX;
7547		};
7548	} else {
7549		lf = function(x) {
7550			return x <= (size.width / 2);
7551		};
7552		rf = function(x) {
7553			return x >= (chart.width - (size.width / 2));
7554		};
7555	}
7556
7557	olf = function(x) {
7558		return x + size.width + model.caretSize + model.caretPadding > chart.width;
7559	};
7560	orf = function(x) {
7561		return x - size.width - model.caretSize - model.caretPadding < 0;
7562	};
7563	yf = function(y) {
7564		return y <= midY ? 'top' : 'bottom';
7565	};
7566
7567	if (lf(model.x)) {
7568		xAlign = 'left';
7569
7570		// Is tooltip too wide and goes over the right side of the chart.?
7571		if (olf(model.x)) {
7572			xAlign = 'center';
7573			yAlign = yf(model.y);
7574		}
7575	} else if (rf(model.x)) {
7576		xAlign = 'right';
7577
7578		// Is tooltip too wide and goes outside left edge of canvas?
7579		if (orf(model.x)) {
7580			xAlign = 'center';
7581			yAlign = yf(model.y);
7582		}
7583	}
7584
7585	var opts = tooltip._options;
7586	return {
7587		xAlign: opts.xAlign ? opts.xAlign : xAlign,
7588		yAlign: opts.yAlign ? opts.yAlign : yAlign
7589	};
7590}
7591
7592/**
7593 * Helper to get the location a tooltip needs to be placed at given the initial position (via the vm) and the size and alignment
7594 */
7595function getBackgroundPoint(vm, size, alignment, chart) {
7596	// Background Position
7597	var x = vm.x;
7598	var y = vm.y;
7599
7600	var caretSize = vm.caretSize;
7601	var caretPadding = vm.caretPadding;
7602	var cornerRadius = vm.cornerRadius;
7603	var xAlign = alignment.xAlign;
7604	var yAlign = alignment.yAlign;
7605	var paddingAndSize = caretSize + caretPadding;
7606	var radiusAndPadding = cornerRadius + caretPadding;
7607
7608	if (xAlign === 'right') {
7609		x -= size.width;
7610	} else if (xAlign === 'center') {
7611		x -= (size.width / 2);
7612		if (x + size.width > chart.width) {
7613			x = chart.width - size.width;
7614		}
7615		if (x < 0) {
7616			x = 0;
7617		}
7618	}
7619
7620	if (yAlign === 'top') {
7621		y += paddingAndSize;
7622	} else if (yAlign === 'bottom') {
7623		y -= size.height + paddingAndSize;
7624	} else {
7625		y -= (size.height / 2);
7626	}
7627
7628	if (yAlign === 'center') {
7629		if (xAlign === 'left') {
7630			x += paddingAndSize;
7631		} else if (xAlign === 'right') {
7632			x -= paddingAndSize;
7633		}
7634	} else if (xAlign === 'left') {
7635		x -= radiusAndPadding;
7636	} else if (xAlign === 'right') {
7637		x += radiusAndPadding;
7638	}
7639
7640	return {
7641		x: x,
7642		y: y
7643	};
7644}
7645
7646function getAlignedX(vm, align) {
7647	return align === 'center'
7648		? vm.x + vm.width / 2
7649		: align === 'right'
7650			? vm.x + vm.width - vm.xPadding
7651			: vm.x + vm.xPadding;
7652}
7653
7654/**
7655 * Helper to build before and after body lines
7656 */
7657function getBeforeAfterBodyLines(callback) {
7658	return pushOrConcat([], splitNewlines(callback));
7659}
7660
7661var exports$3 = core_element.extend({
7662	initialize: function() {
7663		this._model = getBaseModel(this._options);
7664		this._lastActive = [];
7665	},
7666
7667	// Get the title
7668	// Args are: (tooltipItem, data)
7669	getTitle: function() {
7670		var me = this;
7671		var opts = me._options;
7672		var callbacks = opts.callbacks;
7673
7674		var beforeTitle = callbacks.beforeTitle.apply(me, arguments);
7675		var title = callbacks.title.apply(me, arguments);
7676		var afterTitle = callbacks.afterTitle.apply(me, arguments);
7677
7678		var lines = [];
7679		lines = pushOrConcat(lines, splitNewlines(beforeTitle));
7680		lines = pushOrConcat(lines, splitNewlines(title));
7681		lines = pushOrConcat(lines, splitNewlines(afterTitle));
7682
7683		return lines;
7684	},
7685
7686	// Args are: (tooltipItem, data)
7687	getBeforeBody: function() {
7688		return getBeforeAfterBodyLines(this._options.callbacks.beforeBody.apply(this, arguments));
7689	},
7690
7691	// Args are: (tooltipItem, data)
7692	getBody: function(tooltipItems, data) {
7693		var me = this;
7694		var callbacks = me._options.callbacks;
7695		var bodyItems = [];
7696
7697		helpers$1.each(tooltipItems, function(tooltipItem) {
7698			var bodyItem = {
7699				before: [],
7700				lines: [],
7701				after: []
7702			};
7703			pushOrConcat(bodyItem.before, splitNewlines(callbacks.beforeLabel.call(me, tooltipItem, data)));
7704			pushOrConcat(bodyItem.lines, callbacks.label.call(me, tooltipItem, data));
7705			pushOrConcat(bodyItem.after, splitNewlines(callbacks.afterLabel.call(me, tooltipItem, data)));
7706
7707			bodyItems.push(bodyItem);
7708		});
7709
7710		return bodyItems;
7711	},
7712
7713	// Args are: (tooltipItem, data)
7714	getAfterBody: function() {
7715		return getBeforeAfterBodyLines(this._options.callbacks.afterBody.apply(this, arguments));
7716	},
7717
7718	// Get the footer and beforeFooter and afterFooter lines
7719	// Args are: (tooltipItem, data)
7720	getFooter: function() {
7721		var me = this;
7722		var callbacks = me._options.callbacks;
7723
7724		var beforeFooter = callbacks.beforeFooter.apply(me, arguments);
7725		var footer = callbacks.footer.apply(me, arguments);
7726		var afterFooter = callbacks.afterFooter.apply(me, arguments);
7727
7728		var lines = [];
7729		lines = pushOrConcat(lines, splitNewlines(beforeFooter));
7730		lines = pushOrConcat(lines, splitNewlines(footer));
7731		lines = pushOrConcat(lines, splitNewlines(afterFooter));
7732
7733		return lines;
7734	},
7735
7736	update: function(changed) {
7737		var me = this;
7738		var opts = me._options;
7739
7740		// Need to regenerate the model because its faster than using extend and it is necessary due to the optimization in Chart.Element.transition
7741		// that does _view = _model if ease === 1. This causes the 2nd tooltip update to set properties in both the view and model at the same time
7742		// which breaks any animations.
7743		var existingModel = me._model;
7744		var model = me._model = getBaseModel(opts);
7745		var active = me._active;
7746
7747		var data = me._data;
7748
7749		// In the case where active.length === 0 we need to keep these at existing values for good animations
7750		var alignment = {
7751			xAlign: existingModel.xAlign,
7752			yAlign: existingModel.yAlign
7753		};
7754		var backgroundPoint = {
7755			x: existingModel.x,
7756			y: existingModel.y
7757		};
7758		var tooltipSize = {
7759			width: existingModel.width,
7760			height: existingModel.height
7761		};
7762		var tooltipPosition = {
7763			x: existingModel.caretX,
7764			y: existingModel.caretY
7765		};
7766
7767		var i, len;
7768
7769		if (active.length) {
7770			model.opacity = 1;
7771
7772			var labelColors = [];
7773			var labelTextColors = [];
7774			tooltipPosition = positioners[opts.position].call(me, active, me._eventPosition);
7775
7776			var tooltipItems = [];
7777			for (i = 0, len = active.length; i < len; ++i) {
7778				tooltipItems.push(createTooltipItem(active[i]));
7779			}
7780
7781			// If the user provided a filter function, use it to modify the tooltip items
7782			if (opts.filter) {
7783				tooltipItems = tooltipItems.filter(function(a) {
7784					return opts.filter(a, data);
7785				});
7786			}
7787
7788			// If the user provided a sorting function, use it to modify the tooltip items
7789			if (opts.itemSort) {
7790				tooltipItems = tooltipItems.sort(function(a, b) {
7791					return opts.itemSort(a, b, data);
7792				});
7793			}
7794
7795			// Determine colors for boxes
7796			helpers$1.each(tooltipItems, function(tooltipItem) {
7797				labelColors.push(opts.callbacks.labelColor.call(me, tooltipItem, me._chart));
7798				labelTextColors.push(opts.callbacks.labelTextColor.call(me, tooltipItem, me._chart));
7799			});
7800
7801
7802			// Build the Text Lines
7803			model.title = me.getTitle(tooltipItems, data);
7804			model.beforeBody = me.getBeforeBody(tooltipItems, data);
7805			model.body = me.getBody(tooltipItems, data);
7806			model.afterBody = me.getAfterBody(tooltipItems, data);
7807			model.footer = me.getFooter(tooltipItems, data);
7808
7809			// Initial positioning and colors
7810			model.x = tooltipPosition.x;
7811			model.y = tooltipPosition.y;
7812			model.caretPadding = opts.caretPadding;
7813			model.labelColors = labelColors;
7814			model.labelTextColors = labelTextColors;
7815
7816			// data points
7817			model.dataPoints = tooltipItems;
7818
7819			// We need to determine alignment of the tooltip
7820			tooltipSize = getTooltipSize(this, model);
7821			alignment = determineAlignment(this, tooltipSize);
7822			// Final Size and Position
7823			backgroundPoint = getBackgroundPoint(model, tooltipSize, alignment, me._chart);
7824		} else {
7825			model.opacity = 0;
7826		}
7827
7828		model.xAlign = alignment.xAlign;
7829		model.yAlign = alignment.yAlign;
7830		model.x = backgroundPoint.x;
7831		model.y = backgroundPoint.y;
7832		model.width = tooltipSize.width;
7833		model.height = tooltipSize.height;
7834
7835		// Point where the caret on the tooltip points to
7836		model.caretX = tooltipPosition.x;
7837		model.caretY = tooltipPosition.y;
7838
7839		me._model = model;
7840
7841		if (changed && opts.custom) {
7842			opts.custom.call(me, model);
7843		}
7844
7845		return me;
7846	},
7847
7848	drawCaret: function(tooltipPoint, size) {
7849		var ctx = this._chart.ctx;
7850		var vm = this._view;
7851		var caretPosition = this.getCaretPosition(tooltipPoint, size, vm);
7852
7853		ctx.lineTo(caretPosition.x1, caretPosition.y1);
7854		ctx.lineTo(caretPosition.x2, caretPosition.y2);
7855		ctx.lineTo(caretPosition.x3, caretPosition.y3);
7856	},
7857	getCaretPosition: function(tooltipPoint, size, vm) {
7858		var x1, x2, x3, y1, y2, y3;
7859		var caretSize = vm.caretSize;
7860		var cornerRadius = vm.cornerRadius;
7861		var xAlign = vm.xAlign;
7862		var yAlign = vm.yAlign;
7863		var ptX = tooltipPoint.x;
7864		var ptY = tooltipPoint.y;
7865		var width = size.width;
7866		var height = size.height;
7867
7868		if (yAlign === 'center') {
7869			y2 = ptY + (height / 2);
7870
7871			if (xAlign === 'left') {
7872				x1 = ptX;
7873				x2 = x1 - caretSize;
7874				x3 = x1;
7875
7876				y1 = y2 + caretSize;
7877				y3 = y2 - caretSize;
7878			} else {
7879				x1 = ptX + width;
7880				x2 = x1 + caretSize;
7881				x3 = x1;
7882
7883				y1 = y2 - caretSize;
7884				y3 = y2 + caretSize;
7885			}
7886		} else {
7887			if (xAlign === 'left') {
7888				x2 = ptX + cornerRadius + (caretSize);
7889				x1 = x2 - caretSize;
7890				x3 = x2 + caretSize;
7891			} else if (xAlign === 'right') {
7892				x2 = ptX + width - cornerRadius - caretSize;
7893				x1 = x2 - caretSize;
7894				x3 = x2 + caretSize;
7895			} else {
7896				x2 = vm.caretX;
7897				x1 = x2 - caretSize;
7898				x3 = x2 + caretSize;
7899			}
7900			if (yAlign === 'top') {
7901				y1 = ptY;
7902				y2 = y1 - caretSize;
7903				y3 = y1;
7904			} else {
7905				y1 = ptY + height;
7906				y2 = y1 + caretSize;
7907				y3 = y1;
7908				// invert drawing order
7909				var tmp = x3;
7910				x3 = x1;
7911				x1 = tmp;
7912			}
7913		}
7914		return {x1: x1, x2: x2, x3: x3, y1: y1, y2: y2, y3: y3};
7915	},
7916
7917	drawTitle: function(pt, vm, ctx) {
7918		var title = vm.title;
7919
7920		if (title.length) {
7921			pt.x = getAlignedX(vm, vm._titleAlign);
7922
7923			ctx.textAlign = vm._titleAlign;
7924			ctx.textBaseline = 'top';
7925
7926			var titleFontSize = vm.titleFontSize;
7927			var titleSpacing = vm.titleSpacing;
7928
7929			ctx.fillStyle = vm.titleFontColor;
7930			ctx.font = helpers$1.fontString(titleFontSize, vm._titleFontStyle, vm._titleFontFamily);
7931
7932			var i, len;
7933			for (i = 0, len = title.length; i < len; ++i) {
7934				ctx.fillText(title[i], pt.x, pt.y);
7935				pt.y += titleFontSize + titleSpacing; // Line Height and spacing
7936
7937				if (i + 1 === title.length) {
7938					pt.y += vm.titleMarginBottom - titleSpacing; // If Last, add margin, remove spacing
7939				}
7940			}
7941		}
7942	},
7943
7944	drawBody: function(pt, vm, ctx) {
7945		var bodyFontSize = vm.bodyFontSize;
7946		var bodySpacing = vm.bodySpacing;
7947		var bodyAlign = vm._bodyAlign;
7948		var body = vm.body;
7949		var drawColorBoxes = vm.displayColors;
7950		var labelColors = vm.labelColors;
7951		var xLinePadding = 0;
7952		var colorX = drawColorBoxes ? getAlignedX(vm, 'left') : 0;
7953		var textColor;
7954
7955		ctx.textAlign = bodyAlign;
7956		ctx.textBaseline = 'top';
7957		ctx.font = helpers$1.fontString(bodyFontSize, vm._bodyFontStyle, vm._bodyFontFamily);
7958
7959		pt.x = getAlignedX(vm, bodyAlign);
7960
7961		// Before Body
7962		var fillLineOfText = function(line) {
7963			ctx.fillText(line, pt.x + xLinePadding, pt.y);
7964			pt.y += bodyFontSize + bodySpacing;
7965		};
7966
7967		// Before body lines
7968		ctx.fillStyle = vm.bodyFontColor;
7969		helpers$1.each(vm.beforeBody, fillLineOfText);
7970
7971		xLinePadding = drawColorBoxes && bodyAlign !== 'right'
7972			? bodyAlign === 'center' ? (bodyFontSize / 2 + 1) : (bodyFontSize + 2)
7973			: 0;
7974
7975		// Draw body lines now
7976		helpers$1.each(body, function(bodyItem, i) {
7977			textColor = vm.labelTextColors[i];
7978			ctx.fillStyle = textColor;
7979			helpers$1.each(bodyItem.before, fillLineOfText);
7980
7981			helpers$1.each(bodyItem.lines, function(line) {
7982				// Draw Legend-like boxes if needed
7983				if (drawColorBoxes) {
7984					// Fill a white rect so that colours merge nicely if the opacity is < 1
7985					ctx.fillStyle = vm.legendColorBackground;
7986					ctx.fillRect(colorX, pt.y, bodyFontSize, bodyFontSize);
7987
7988					// Border
7989					ctx.lineWidth = 1;
7990					ctx.strokeStyle = labelColors[i].borderColor;
7991					ctx.strokeRect(colorX, pt.y, bodyFontSize, bodyFontSize);
7992
7993					// Inner square
7994					ctx.fillStyle = labelColors[i].backgroundColor;
7995					ctx.fillRect(colorX + 1, pt.y + 1, bodyFontSize - 2, bodyFontSize - 2);
7996					ctx.fillStyle = textColor;
7997				}
7998
7999				fillLineOfText(line);
8000			});
8001
8002			helpers$1.each(bodyItem.after, fillLineOfText);
8003		});
8004
8005		// Reset back to 0 for after body
8006		xLinePadding = 0;
8007
8008		// After body lines
8009		helpers$1.each(vm.afterBody, fillLineOfText);
8010		pt.y -= bodySpacing; // Remove last body spacing
8011	},
8012
8013	drawFooter: function(pt, vm, ctx) {
8014		var footer = vm.footer;
8015
8016		if (footer.length) {
8017			pt.x = getAlignedX(vm, vm._footerAlign);
8018			pt.y += vm.footerMarginTop;
8019
8020			ctx.textAlign = vm._footerAlign;
8021			ctx.textBaseline = 'top';
8022
8023			ctx.fillStyle = vm.footerFontColor;
8024			ctx.font = helpers$1.fontString(vm.footerFontSize, vm._footerFontStyle, vm._footerFontFamily);
8025
8026			helpers$1.each(footer, function(line) {
8027				ctx.fillText(line, pt.x, pt.y);
8028				pt.y += vm.footerFontSize + vm.footerSpacing;
8029			});
8030		}
8031	},
8032
8033	drawBackground: function(pt, vm, ctx, tooltipSize) {
8034		ctx.fillStyle = vm.backgroundColor;
8035		ctx.strokeStyle = vm.borderColor;
8036		ctx.lineWidth = vm.borderWidth;
8037		var xAlign = vm.xAlign;
8038		var yAlign = vm.yAlign;
8039		var x = pt.x;
8040		var y = pt.y;
8041		var width = tooltipSize.width;
8042		var height = tooltipSize.height;
8043		var radius = vm.cornerRadius;
8044
8045		ctx.beginPath();
8046		ctx.moveTo(x + radius, y);
8047		if (yAlign === 'top') {
8048			this.drawCaret(pt, tooltipSize);
8049		}
8050		ctx.lineTo(x + width - radius, y);
8051		ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
8052		if (yAlign === 'center' && xAlign === 'right') {
8053			this.drawCaret(pt, tooltipSize);
8054		}
8055		ctx.lineTo(x + width, y + height - radius);
8056		ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
8057		if (yAlign === 'bottom') {
8058			this.drawCaret(pt, tooltipSize);
8059		}
8060		ctx.lineTo(x + radius, y + height);
8061		ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
8062		if (yAlign === 'center' && xAlign === 'left') {
8063			this.drawCaret(pt, tooltipSize);
8064		}
8065		ctx.lineTo(x, y + radius);
8066		ctx.quadraticCurveTo(x, y, x + radius, y);
8067		ctx.closePath();
8068
8069		ctx.fill();
8070
8071		if (vm.borderWidth > 0) {
8072			ctx.stroke();
8073		}
8074	},
8075
8076	draw: function() {
8077		var ctx = this._chart.ctx;
8078		var vm = this._view;
8079
8080		if (vm.opacity === 0) {
8081			return;
8082		}
8083
8084		var tooltipSize = {
8085			width: vm.width,
8086			height: vm.height
8087		};
8088		var pt = {
8089			x: vm.x,
8090			y: vm.y
8091		};
8092
8093		// IE11/Edge does not like very small opacities, so snap to 0
8094		var opacity = Math.abs(vm.opacity < 1e-3) ? 0 : vm.opacity;
8095
8096		// Truthy/falsey value for empty tooltip
8097		var hasTooltipContent = vm.title.length || vm.beforeBody.length || vm.body.length || vm.afterBody.length || vm.footer.length;
8098
8099		if (this._options.enabled && hasTooltipContent) {
8100			ctx.save();
8101			ctx.globalAlpha = opacity;
8102
8103			// Draw Background
8104			this.drawBackground(pt, vm, ctx, tooltipSize);
8105
8106			// Draw Title, Body, and Footer
8107			pt.y += vm.yPadding;
8108
8109			// Titles
8110			this.drawTitle(pt, vm, ctx);
8111
8112			// Body
8113			this.drawBody(pt, vm, ctx);
8114
8115			// Footer
8116			this.drawFooter(pt, vm, ctx);
8117
8118			ctx.restore();
8119		}
8120	},
8121
8122	/**
8123	 * Handle an event
8124	 * @private
8125	 * @param {IEvent} event - The event to handle
8126	 * @returns {Boolean} true if the tooltip changed
8127	 */
8128	handleEvent: function(e) {
8129		var me = this;
8130		var options = me._options;
8131		var changed = false;
8132
8133		me._lastActive = me._lastActive || [];
8134
8135		// Find Active Elements for tooltips
8136		if (e.type === 'mouseout') {
8137			me._active = [];
8138		} else {
8139			me._active = me._chart.getElementsAtEventForMode(e, options.mode, options);
8140		}
8141
8142		// Remember Last Actives
8143		changed = !helpers$1.arrayEquals(me._active, me._lastActive);
8144
8145		// Only handle target event on tooltip change
8146		if (changed) {
8147			me._lastActive = me._active;
8148
8149			if (options.enabled || options.custom) {
8150				me._eventPosition = {
8151					x: e.x,
8152					y: e.y
8153				};
8154
8155				me.update(true);
8156				me.pivot();
8157			}
8158		}
8159
8160		return changed;
8161	}
8162});
8163
8164/**
8165 * @namespace Chart.Tooltip.positioners
8166 */
8167var positioners_1 = positioners;
8168
8169var core_tooltip = exports$3;
8170core_tooltip.positioners = positioners_1;
8171
8172var valueOrDefault$6 = helpers$1.valueOrDefault;
8173
8174core_defaults._set('global', {
8175	elements: {},
8176	events: [
8177		'mousemove',
8178		'mouseout',
8179		'click',
8180		'touchstart',
8181		'touchmove'
8182	],
8183	hover: {
8184		onHover: null,
8185		mode: 'nearest',
8186		intersect: true,
8187		animationDuration: 400
8188	},
8189	onClick: null,
8190	maintainAspectRatio: true,
8191	responsive: true,
8192	responsiveAnimationDuration: 0
8193});
8194
8195function initConfig(config) {
8196	config = config || {};
8197
8198	// Do NOT use configMerge() for the data object because this method merges arrays
8199	// and so would change references to labels and datasets, preventing data updates.
8200	var data = config.data = config.data || {};
8201	data.datasets = data.datasets || [];
8202	data.labels = data.labels || [];
8203
8204	config.options = helpers$1.configMerge(
8205		core_defaults.global,
8206		core_defaults[config.type],
8207		config.options || {});
8208
8209	return config;
8210}
8211
8212function updateConfig(chart) {
8213	var newOptions = chart.options;
8214
8215	helpers$1.each(chart.scales, function(scale) {
8216		core_layouts.removeBox(chart, scale);
8217	});
8218
8219	newOptions = helpers$1.configMerge(
8220		core_defaults.global,
8221		core_defaults[chart.config.type],
8222		newOptions);
8223
8224	chart.options = chart.config.options = newOptions;
8225	chart.ensureScalesHaveIDs();
8226	chart.buildOrUpdateScales();
8227
8228	// Tooltip
8229	chart.tooltip._options = newOptions.tooltips;
8230	chart.tooltip.initialize();
8231}
8232
8233function positionIsHorizontal(position) {
8234	return position === 'top' || position === 'bottom';
8235}
8236
8237var Chart = function(item, config) {
8238	this.construct(item, config);
8239	return this;
8240};
8241
8242helpers$1.extend(Chart.prototype, /** @lends Chart */ {
8243	/**
8244	 * @private
8245	 */
8246	construct: function(item, config) {
8247		var me = this;
8248
8249		config = initConfig(config);
8250
8251		var context = platform.acquireContext(item, config);
8252		var canvas = context && context.canvas;
8253		var height = canvas && canvas.height;
8254		var width = canvas && canvas.width;
8255
8256		me.id = helpers$1.uid();
8257		me.ctx = context;
8258		me.canvas = canvas;
8259		me.config = config;
8260		me.width = width;
8261		me.height = height;
8262		me.aspectRatio = height ? width / height : null;
8263		me.options = config.options;
8264		me._bufferedRender = false;
8265
8266		/**
8267		 * Provided for backward compatibility, Chart and Chart.Controller have been merged,
8268		 * the "instance" still need to be defined since it might be called from plugins.
8269		 * @prop Chart#chart
8270		 * @deprecated since version 2.6.0
8271		 * @todo remove at version 3
8272		 * @private
8273		 */
8274		me.chart = me;
8275		me.controller = me; // chart.chart.controller #inception
8276
8277		// Add the chart instance to the global namespace
8278		Chart.instances[me.id] = me;
8279
8280		// Define alias to the config data: `chart.data === chart.config.data`
8281		Object.defineProperty(me, 'data', {
8282			get: function() {
8283				return me.config.data;
8284			},
8285			set: function(value) {
8286				me.config.data = value;
8287			}
8288		});
8289
8290		if (!context || !canvas) {
8291			// The given item is not a compatible context2d element, let's return before finalizing
8292			// the chart initialization but after setting basic chart / controller properties that
8293			// can help to figure out that the chart is not valid (e.g chart.canvas !== null);
8294			// https://github.com/chartjs/Chart.js/issues/2807
8295			console.error("Failed to create chart: can't acquire context from the given item");
8296			return;
8297		}
8298
8299		me.initialize();
8300		me.update();
8301	},
8302
8303	/**
8304	 * @private
8305	 */
8306	initialize: function() {
8307		var me = this;
8308
8309		// Before init plugin notification
8310		core_plugins.notify(me, 'beforeInit');
8311
8312		helpers$1.retinaScale(me, me.options.devicePixelRatio);
8313
8314		me.bindEvents();
8315
8316		if (me.options.responsive) {
8317			// Initial resize before chart draws (must be silent to preserve initial animations).
8318			me.resize(true);
8319		}
8320
8321		// Make sure scales have IDs and are built before we build any controllers.
8322		me.ensureScalesHaveIDs();
8323		me.buildOrUpdateScales();
8324		me.initToolTip();
8325
8326		// After init plugin notification
8327		core_plugins.notify(me, 'afterInit');
8328
8329		return me;
8330	},
8331
8332	clear: function() {
8333		helpers$1.canvas.clear(this);
8334		return this;
8335	},
8336
8337	stop: function() {
8338		// Stops any current animation loop occurring
8339		core_animations.cancelAnimation(this);
8340		return this;
8341	},
8342
8343	resize: function(silent) {
8344		var me = this;
8345		var options = me.options;
8346		var canvas = me.canvas;
8347		var aspectRatio = (options.maintainAspectRatio && me.aspectRatio) || null;
8348
8349		// the canvas render width and height will be casted to integers so make sure that
8350		// the canvas display style uses the same integer values to avoid blurring effect.
8351
8352		// Set to 0 instead of canvas.size because the size defaults to 300x150 if the element is collapsed
8353		var newWidth = Math.max(0, Math.floor(helpers$1.getMaximumWidth(canvas)));
8354		var newHeight = Math.max(0, Math.floor(aspectRatio ? newWidth / aspectRatio : helpers$1.getMaximumHeight(canvas)));
8355
8356		if (me.width === newWidth && me.height === newHeight) {
8357			return;
8358		}
8359
8360		canvas.width = me.width = newWidth;
8361		canvas.height = me.height = newHeight;
8362		canvas.style.width = newWidth + 'px';
8363		canvas.style.height = newHeight + 'px';
8364
8365		helpers$1.retinaScale(me, options.devicePixelRatio);
8366
8367		if (!silent) {
8368			// Notify any plugins about the resize
8369			var newSize = {width: newWidth, height: newHeight};
8370			core_plugins.notify(me, 'resize', [newSize]);
8371
8372			// Notify of resize
8373			if (me.options.onResize) {
8374				me.options.onResize(me, newSize);
8375			}
8376
8377			me.stop();
8378			me.update({
8379				duration: me.options.responsiveAnimationDuration
8380			});
8381		}
8382	},
8383
8384	ensureScalesHaveIDs: function() {
8385		var options = this.options;
8386		var scalesOptions = options.scales || {};
8387		var scaleOptions = options.scale;
8388
8389		helpers$1.each(scalesOptions.xAxes, function(xAxisOptions, index) {
8390			xAxisOptions.id = xAxisOptions.id || ('x-axis-' + index);
8391		});
8392
8393		helpers$1.each(scalesOptions.yAxes, function(yAxisOptions, index) {
8394			yAxisOptions.id = yAxisOptions.id || ('y-axis-' + index);
8395		});
8396
8397		if (scaleOptions) {
8398			scaleOptions.id = scaleOptions.id || 'scale';
8399		}
8400	},
8401
8402	/**
8403	 * Builds a map of scale ID to scale object for future lookup.
8404	 */
8405	buildOrUpdateScales: function() {
8406		var me = this;
8407		var options = me.options;
8408		var scales = me.scales || {};
8409		var items = [];
8410		var updated = Object.keys(scales).reduce(function(obj, id) {
8411			obj[id] = false;
8412			return obj;
8413		}, {});
8414
8415		if (options.scales) {
8416			items = items.concat(
8417				(options.scales.xAxes || []).map(function(xAxisOptions) {
8418					return {options: xAxisOptions, dtype: 'category', dposition: 'bottom'};
8419				}),
8420				(options.scales.yAxes || []).map(function(yAxisOptions) {
8421					return {options: yAxisOptions, dtype: 'linear', dposition: 'left'};
8422				})
8423			);
8424		}
8425
8426		if (options.scale) {
8427			items.push({
8428				options: options.scale,
8429				dtype: 'radialLinear',
8430				isDefault: true,
8431				dposition: 'chartArea'
8432			});
8433		}
8434
8435		helpers$1.each(items, function(item) {
8436			var scaleOptions = item.options;
8437			var id = scaleOptions.id;
8438			var scaleType = valueOrDefault$6(scaleOptions.type, item.dtype);
8439
8440			if (positionIsHorizontal(scaleOptions.position) !== positionIsHorizontal(item.dposition)) {
8441				scaleOptions.position = item.dposition;
8442			}
8443
8444			updated[id] = true;
8445			var scale = null;
8446			if (id in scales && scales[id].type === scaleType) {
8447				scale = scales[id];
8448				scale.options = scaleOptions;
8449				scale.ctx = me.ctx;
8450				scale.chart = me;
8451			} else {
8452				var scaleClass = core_scaleService.getScaleConstructor(scaleType);
8453				if (!scaleClass) {
8454					return;
8455				}
8456				scale = new scaleClass({
8457					id: id,
8458					type: scaleType,
8459					options: scaleOptions,
8460					ctx: me.ctx,
8461					chart: me
8462				});
8463				scales[scale.id] = scale;
8464			}
8465
8466			scale.mergeTicksOptions();
8467
8468			// TODO(SB): I think we should be able to remove this custom case (options.scale)
8469			// and consider it as a regular scale part of the "scales"" map only! This would
8470			// make the logic easier and remove some useless? custom code.
8471			if (item.isDefault) {
8472				me.scale = scale;
8473			}
8474		});
8475		// clear up discarded scales
8476		helpers$1.each(updated, function(hasUpdated, id) {
8477			if (!hasUpdated) {
8478				delete scales[id];
8479			}
8480		});
8481
8482		me.scales = scales;
8483
8484		core_scaleService.addScalesToLayout(this);
8485	},
8486
8487	buildOrUpdateControllers: function() {
8488		var me = this;
8489		var newControllers = [];
8490
8491		helpers$1.each(me.data.datasets, function(dataset, datasetIndex) {
8492			var meta = me.getDatasetMeta(datasetIndex);
8493			var type = dataset.type || me.config.type;
8494
8495			if (meta.type && meta.type !== type) {
8496				me.destroyDatasetMeta(datasetIndex);
8497				meta = me.getDatasetMeta(datasetIndex);
8498			}
8499			meta.type = type;
8500
8501			if (meta.controller) {
8502				meta.controller.updateIndex(datasetIndex);
8503				meta.controller.linkScales();
8504			} else {
8505				var ControllerClass = controllers[meta.type];
8506				if (ControllerClass === undefined) {
8507					throw new Error('"' + meta.type + '" is not a chart type.');
8508				}
8509
8510				meta.controller = new ControllerClass(me, datasetIndex);
8511				newControllers.push(meta.controller);
8512			}
8513		}, me);
8514
8515		return newControllers;
8516	},
8517
8518	/**
8519	 * Reset the elements of all datasets
8520	 * @private
8521	 */
8522	resetElements: function() {
8523		var me = this;
8524		helpers$1.each(me.data.datasets, function(dataset, datasetIndex) {
8525			me.getDatasetMeta(datasetIndex).controller.reset();
8526		}, me);
8527	},
8528
8529	/**
8530	* Resets the chart back to it's state before the initial animation
8531	*/
8532	reset: function() {
8533		this.resetElements();
8534		this.tooltip.initialize();
8535	},
8536
8537	update: function(config) {
8538		var me = this;
8539
8540		if (!config || typeof config !== 'object') {
8541			// backwards compatibility
8542			config = {
8543				duration: config,
8544				lazy: arguments[1]
8545			};
8546		}
8547
8548		updateConfig(me);
8549
8550		// plugins options references might have change, let's invalidate the cache
8551		// https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167
8552		core_plugins._invalidate(me);
8553
8554		if (core_plugins.notify(me, 'beforeUpdate') === false) {
8555			return;
8556		}
8557
8558		// In case the entire data object changed
8559		me.tooltip._data = me.data;
8560
8561		// Make sure dataset controllers are updated and new controllers are reset
8562		var newControllers = me.buildOrUpdateControllers();
8563
8564		// Make sure all dataset controllers have correct meta data counts
8565		helpers$1.each(me.data.datasets, function(dataset, datasetIndex) {
8566			me.getDatasetMeta(datasetIndex).controller.buildOrUpdateElements();
8567		}, me);
8568
8569		me.updateLayout();
8570
8571		// Can only reset the new controllers after the scales have been updated
8572		if (me.options.animation && me.options.animation.duration) {
8573			helpers$1.each(newControllers, function(controller) {
8574				controller.reset();
8575			});
8576		}
8577
8578		me.updateDatasets();
8579
8580		// Need to reset tooltip in case it is displayed with elements that are removed
8581		// after update.
8582		me.tooltip.initialize();
8583
8584		// Last active contains items that were previously in the tooltip.
8585		// When we reset the tooltip, we need to clear it
8586		me.lastActive = [];
8587
8588		// Do this before render so that any plugins that need final scale updates can use it
8589		core_plugins.notify(me, 'afterUpdate');
8590
8591		if (me._bufferedRender) {
8592			me._bufferedRequest = {
8593				duration: config.duration,
8594				easing: config.easing,
8595				lazy: config.lazy
8596			};
8597		} else {
8598			me.render(config);
8599		}
8600	},
8601
8602	/**
8603	 * Updates the chart layout unless a plugin returns `false` to the `beforeLayout`
8604	 * hook, in which case, plugins will not be called on `afterLayout`.
8605	 * @private
8606	 */
8607	updateLayout: function() {
8608		var me = this;
8609
8610		if (core_plugins.notify(me, 'beforeLayout') === false) {
8611			return;
8612		}
8613
8614		core_layouts.update(this, this.width, this.height);
8615
8616		/**
8617		 * Provided for backward compatibility, use `afterLayout` instead.
8618		 * @method IPlugin#afterScaleUpdate
8619		 * @deprecated since version 2.5.0
8620		 * @todo remove at version 3
8621		 * @private
8622		 */
8623		core_plugins.notify(me, 'afterScaleUpdate');
8624		core_plugins.notify(me, 'afterLayout');
8625	},
8626
8627	/**
8628	 * Updates all datasets unless a plugin returns `false` to the `beforeDatasetsUpdate`
8629	 * hook, in which case, plugins will not be called on `afterDatasetsUpdate`.
8630	 * @private
8631	 */
8632	updateDatasets: function() {
8633		var me = this;
8634
8635		if (core_plugins.notify(me, 'beforeDatasetsUpdate') === false) {
8636			return;
8637		}
8638
8639		for (var i = 0, ilen = me.data.datasets.length; i < ilen; ++i) {
8640			me.updateDataset(i);
8641		}
8642
8643		core_plugins.notify(me, 'afterDatasetsUpdate');
8644	},
8645
8646	/**
8647	 * Updates dataset at index unless a plugin returns `false` to the `beforeDatasetUpdate`
8648	 * hook, in which case, plugins will not be called on `afterDatasetUpdate`.
8649	 * @private
8650	 */
8651	updateDataset: function(index) {
8652		var me = this;
8653		var meta = me.getDatasetMeta(index);
8654		var args = {
8655			meta: meta,
8656			index: index
8657		};
8658
8659		if (core_plugins.notify(me, 'beforeDatasetUpdate', [args]) === false) {
8660			return;
8661		}
8662
8663		meta.controller.update();
8664
8665		core_plugins.notify(me, 'afterDatasetUpdate', [args]);
8666	},
8667
8668	render: function(config) {
8669		var me = this;
8670
8671		if (!config || typeof config !== 'object') {
8672			// backwards compatibility
8673			config = {
8674				duration: config,
8675				lazy: arguments[1]
8676			};
8677		}
8678
8679		var animationOptions = me.options.animation;
8680		var duration = valueOrDefault$6(config.duration, animationOptions && animationOptions.duration);
8681		var lazy = config.lazy;
8682
8683		if (core_plugins.notify(me, 'beforeRender') === false) {
8684			return;
8685		}
8686
8687		var onComplete = function(animation) {
8688			core_plugins.notify(me, 'afterRender');
8689			helpers$1.callback(animationOptions && animationOptions.onComplete, [animation], me);
8690		};
8691
8692		if (animationOptions && duration) {
8693			var animation = new core_animation({
8694				numSteps: duration / 16.66, // 60 fps
8695				easing: config.easing || animationOptions.easing,
8696
8697				render: function(chart, animationObject) {
8698					var easingFunction = helpers$1.easing.effects[animationObject.easing];
8699					var currentStep = animationObject.currentStep;
8700					var stepDecimal = currentStep / animationObject.numSteps;
8701
8702					chart.draw(easingFunction(stepDecimal), stepDecimal, currentStep);
8703				},
8704
8705				onAnimationProgress: animationOptions.onProgress,
8706				onAnimationComplete: onComplete
8707			});
8708
8709			core_animations.addAnimation(me, animation, duration, lazy);
8710		} else {
8711			me.draw();
8712
8713			// See https://github.com/chartjs/Chart.js/issues/3781
8714			onComplete(new core_animation({numSteps: 0, chart: me}));
8715		}
8716
8717		return me;
8718	},
8719
8720	draw: function(easingValue) {
8721		var me = this;
8722
8723		me.clear();
8724
8725		if (helpers$1.isNullOrUndef(easingValue)) {
8726			easingValue = 1;
8727		}
8728
8729		me.transition(easingValue);
8730
8731		if (me.width <= 0 || me.height <= 0) {
8732			return;
8733		}
8734
8735		if (core_plugins.notify(me, 'beforeDraw', [easingValue]) === false) {
8736			return;
8737		}
8738
8739		// Draw all the scales
8740		helpers$1.each(me.boxes, function(box) {
8741			box.draw(me.chartArea);
8742		}, me);
8743
8744		if (me.scale) {
8745			me.scale.draw();
8746		}
8747
8748		me.drawDatasets(easingValue);
8749		me._drawTooltip(easingValue);
8750
8751		core_plugins.notify(me, 'afterDraw', [easingValue]);
8752	},
8753
8754	/**
8755	 * @private
8756	 */
8757	transition: function(easingValue) {
8758		var me = this;
8759
8760		for (var i = 0, ilen = (me.data.datasets || []).length; i < ilen; ++i) {
8761			if (me.isDatasetVisible(i)) {
8762				me.getDatasetMeta(i).controller.transition(easingValue);
8763			}
8764		}
8765
8766		me.tooltip.transition(easingValue);
8767	},
8768
8769	/**
8770	 * Draws all datasets unless a plugin returns `false` to the `beforeDatasetsDraw`
8771	 * hook, in which case, plugins will not be called on `afterDatasetsDraw`.
8772	 * @private
8773	 */
8774	drawDatasets: function(easingValue) {
8775		var me = this;
8776
8777		if (core_plugins.notify(me, 'beforeDatasetsDraw', [easingValue]) === false) {
8778			return;
8779		}
8780
8781		// Draw datasets reversed to support proper line stacking
8782		for (var i = (me.data.datasets || []).length - 1; i >= 0; --i) {
8783			if (me.isDatasetVisible(i)) {
8784				me.drawDataset(i, easingValue);
8785			}
8786		}
8787
8788		core_plugins.notify(me, 'afterDatasetsDraw', [easingValue]);
8789	},
8790
8791	/**
8792	 * Draws dataset at index unless a plugin returns `false` to the `beforeDatasetDraw`
8793	 * hook, in which case, plugins will not be called on `afterDatasetDraw`.
8794	 * @private
8795	 */
8796	drawDataset: function(index, easingValue) {
8797		var me = this;
8798		var meta = me.getDatasetMeta(index);
8799		var args = {
8800			meta: meta,
8801			index: index,
8802			easingValue: easingValue
8803		};
8804
8805		if (core_plugins.notify(me, 'beforeDatasetDraw', [args]) === false) {
8806			return;
8807		}
8808
8809		meta.controller.draw(easingValue);
8810
8811		core_plugins.notify(me, 'afterDatasetDraw', [args]);
8812	},
8813
8814	/**
8815	 * Draws tooltip unless a plugin returns `false` to the `beforeTooltipDraw`
8816	 * hook, in which case, plugins will not be called on `afterTooltipDraw`.
8817	 * @private
8818	 */
8819	_drawTooltip: function(easingValue) {
8820		var me = this;
8821		var tooltip = me.tooltip;
8822		var args = {
8823			tooltip: tooltip,
8824			easingValue: easingValue
8825		};
8826
8827		if (core_plugins.notify(me, 'beforeTooltipDraw', [args]) === false) {
8828			return;
8829		}
8830
8831		tooltip.draw();
8832
8833		core_plugins.notify(me, 'afterTooltipDraw', [args]);
8834	},
8835
8836	// Get the single element that was clicked on
8837	// @return : An object containing the dataset index and element index of the matching element. Also contains the rectangle that was draw
8838	getElementAtEvent: function(e) {
8839		return core_interaction.modes.single(this, e);
8840	},
8841
8842	getElementsAtEvent: function(e) {
8843		return core_interaction.modes.label(this, e, {intersect: true});
8844	},
8845
8846	getElementsAtXAxis: function(e) {
8847		return core_interaction.modes['x-axis'](this, e, {intersect: true});
8848	},
8849
8850	getElementsAtEventForMode: function(e, mode, options) {
8851		var method = core_interaction.modes[mode];
8852		if (typeof method === 'function') {
8853			return method(this, e, options);
8854		}
8855
8856		return [];
8857	},
8858
8859	getDatasetAtEvent: function(e) {
8860		return core_interaction.modes.dataset(this, e, {intersect: true});
8861	},
8862
8863	getDatasetMeta: function(datasetIndex) {
8864		var me = this;
8865		var dataset = me.data.datasets[datasetIndex];
8866		if (!dataset._meta) {
8867			dataset._meta = {};
8868		}
8869
8870		var meta = dataset._meta[me.id];
8871		if (!meta) {
8872			meta = dataset._meta[me.id] = {
8873				type: null,
8874				data: [],
8875				dataset: null,
8876				controller: null,
8877				hidden: null,			// See isDatasetVisible() comment
8878				xAxisID: null,
8879				yAxisID: null
8880			};
8881		}
8882
8883		return meta;
8884	},
8885
8886	getVisibleDatasetCount: function() {
8887		var count = 0;
8888		for (var i = 0, ilen = this.data.datasets.length; i < ilen; ++i) {
8889			if (this.isDatasetVisible(i)) {
8890				count++;
8891			}
8892		}
8893		return count;
8894	},
8895
8896	isDatasetVisible: function(datasetIndex) {
8897		var meta = this.getDatasetMeta(datasetIndex);
8898
8899		// meta.hidden is a per chart dataset hidden flag override with 3 states: if true or false,
8900		// the dataset.hidden value is ignored, else if null, the dataset hidden state is returned.
8901		return typeof meta.hidden === 'boolean' ? !meta.hidden : !this.data.datasets[datasetIndex].hidden;
8902	},
8903
8904	generateLegend: function() {
8905		return this.options.legendCallback(this);
8906	},
8907
8908	/**
8909	 * @private
8910	 */
8911	destroyDatasetMeta: function(datasetIndex) {
8912		var id = this.id;
8913		var dataset = this.data.datasets[datasetIndex];
8914		var meta = dataset._meta && dataset._meta[id];
8915
8916		if (meta) {
8917			meta.controller.destroy();
8918			delete dataset._meta[id];
8919		}
8920	},
8921
8922	destroy: function() {
8923		var me = this;
8924		var canvas = me.canvas;
8925		var i, ilen;
8926
8927		me.stop();
8928
8929		// dataset controllers need to cleanup associated data
8930		for (i = 0, ilen = me.data.datasets.length; i < ilen; ++i) {
8931			me.destroyDatasetMeta(i);
8932		}
8933
8934		if (canvas) {
8935			me.unbindEvents();
8936			helpers$1.canvas.clear(me);
8937			platform.releaseContext(me.ctx);
8938			me.canvas = null;
8939			me.ctx = null;
8940		}
8941
8942		core_plugins.notify(me, 'destroy');
8943
8944		delete Chart.instances[me.id];
8945	},
8946
8947	toBase64Image: function() {
8948		return this.canvas.toDataURL.apply(this.canvas, arguments);
8949	},
8950
8951	initToolTip: function() {
8952		var me = this;
8953		me.tooltip = new core_tooltip({
8954			_chart: me,
8955			_chartInstance: me, // deprecated, backward compatibility
8956			_data: me.data,
8957			_options: me.options.tooltips
8958		}, me);
8959	},
8960
8961	/**
8962	 * @private
8963	 */
8964	bindEvents: function() {
8965		var me = this;
8966		var listeners = me._listeners = {};
8967		var listener = function() {
8968			me.eventHandler.apply(me, arguments);
8969		};
8970
8971		helpers$1.each(me.options.events, function(type) {
8972			platform.addEventListener(me, type, listener);
8973			listeners[type] = listener;
8974		});
8975
8976		// Elements used to detect size change should not be injected for non responsive charts.
8977		// See https://github.com/chartjs/Chart.js/issues/2210
8978		if (me.options.responsive) {
8979			listener = function() {
8980				me.resize();
8981			};
8982
8983			platform.addEventListener(me, 'resize', listener);
8984			listeners.resize = listener;
8985		}
8986	},
8987
8988	/**
8989	 * @private
8990	 */
8991	unbindEvents: function() {
8992		var me = this;
8993		var listeners = me._listeners;
8994		if (!listeners) {
8995			return;
8996		}
8997
8998		delete me._listeners;
8999		helpers$1.each(listeners, function(listener, type) {
9000			platform.removeEventListener(me, type, listener);
9001		});
9002	},
9003
9004	updateHoverStyle: function(elements, mode, enabled) {
9005		var method = enabled ? 'setHoverStyle' : 'removeHoverStyle';
9006		var element, i, ilen;
9007
9008		for (i = 0, ilen = elements.length; i < ilen; ++i) {
9009			element = elements[i];
9010			if (element) {
9011				this.getDatasetMeta(element._datasetIndex).controller[method](element);
9012			}
9013		}
9014	},
9015
9016	/**
9017	 * @private
9018	 */
9019	eventHandler: function(e) {
9020		var me = this;
9021		var tooltip = me.tooltip;
9022
9023		if (core_plugins.notify(me, 'beforeEvent', [e]) === false) {
9024			return;
9025		}
9026
9027		// Buffer any update calls so that renders do not occur
9028		me._bufferedRender = true;
9029		me._bufferedRequest = null;
9030
9031		var changed = me.handleEvent(e);
9032		// for smooth tooltip animations issue #4989
9033		// the tooltip should be the source of change
9034		// Animation check workaround:
9035		// tooltip._start will be null when tooltip isn't animating
9036		if (tooltip) {
9037			changed = tooltip._start
9038				? tooltip.handleEvent(e)
9039				: changed | tooltip.handleEvent(e);
9040		}
9041
9042		core_plugins.notify(me, 'afterEvent', [e]);
9043
9044		var bufferedRequest = me._bufferedRequest;
9045		if (bufferedRequest) {
9046			// If we have an update that was triggered, we need to do a normal render
9047			me.render(bufferedRequest);
9048		} else if (changed && !me.animating) {
9049			// If entering, leaving, or changing elements, animate the change via pivot
9050			me.stop();
9051
9052			// We only need to render at this point. Updating will cause scales to be
9053			// recomputed generating flicker & using more memory than necessary.
9054			me.render({
9055				duration: me.options.hover.animationDuration,
9056				lazy: true
9057			});
9058		}
9059
9060		me._bufferedRender = false;
9061		me._bufferedRequest = null;
9062
9063		return me;
9064	},
9065
9066	/**
9067	 * Handle an event
9068	 * @private
9069	 * @param {IEvent} event the event to handle
9070	 * @return {Boolean} true if the chart needs to re-render
9071	 */
9072	handleEvent: function(e) {
9073		var me = this;
9074		var options = me.options || {};
9075		var hoverOptions = options.hover;
9076		var changed = false;
9077
9078		me.lastActive = me.lastActive || [];
9079
9080		// Find Active Elements for hover and tooltips
9081		if (e.type === 'mouseout') {
9082			me.active = [];
9083		} else {
9084			me.active = me.getElementsAtEventForMode(e, hoverOptions.mode, hoverOptions);
9085		}
9086
9087		// Invoke onHover hook
9088		// Need to call with native event here to not break backwards compatibility
9089		helpers$1.callback(options.onHover || options.hover.onHover, [e.native, me.active], me);
9090
9091		if (e.type === 'mouseup' || e.type === 'click') {
9092			if (options.onClick) {
9093				// Use e.native here for backwards compatibility
9094				options.onClick.call(me, e.native, me.active);
9095			}
9096		}
9097
9098		// Remove styling for last active (even if it may still be active)
9099		if (me.lastActive.length) {
9100			me.updateHoverStyle(me.lastActive, hoverOptions.mode, false);
9101		}
9102
9103		// Built in hover styling
9104		if (me.active.length && hoverOptions.mode) {
9105			me.updateHoverStyle(me.active, hoverOptions.mode, true);
9106		}
9107
9108		changed = !helpers$1.arrayEquals(me.active, me.lastActive);
9109
9110		// Remember Last Actives
9111		me.lastActive = me.active;
9112
9113		return changed;
9114	}
9115});
9116
9117/**
9118 * NOTE(SB) We actually don't use this container anymore but we need to keep it
9119 * for backward compatibility. Though, it can still be useful for plugins that
9120 * would need to work on multiple charts?!
9121 */
9122Chart.instances = {};
9123
9124var core_controller = Chart;
9125
9126// DEPRECATIONS
9127
9128/**
9129 * Provided for backward compatibility, use Chart instead.
9130 * @class Chart.Controller
9131 * @deprecated since version 2.6
9132 * @todo remove at version 3
9133 * @private
9134 */
9135Chart.Controller = Chart;
9136
9137/**
9138 * Provided for backward compatibility, not available anymore.
9139 * @namespace Chart
9140 * @deprecated since version 2.8
9141 * @todo remove at version 3
9142 * @private
9143 */
9144Chart.types = {};
9145
9146var core_helpers = function() {
9147
9148	// -- Basic js utility methods
9149
9150	helpers$1.configMerge = function(/* objects ... */) {
9151		return helpers$1.merge(helpers$1.clone(arguments[0]), [].slice.call(arguments, 1), {
9152			merger: function(key, target, source, options) {
9153				var tval = target[key] || {};
9154				var sval = source[key];
9155
9156				if (key === 'scales') {
9157					// scale config merging is complex. Add our own function here for that
9158					target[key] = helpers$1.scaleMerge(tval, sval);
9159				} else if (key === 'scale') {
9160					// used in polar area & radar charts since there is only one scale
9161					target[key] = helpers$1.merge(tval, [core_scaleService.getScaleDefaults(sval.type), sval]);
9162				} else {
9163					helpers$1._merger(key, target, source, options);
9164				}
9165			}
9166		});
9167	};
9168
9169	helpers$1.scaleMerge = function(/* objects ... */) {
9170		return helpers$1.merge(helpers$1.clone(arguments[0]), [].slice.call(arguments, 1), {
9171			merger: function(key, target, source, options) {
9172				if (key === 'xAxes' || key === 'yAxes') {
9173					var slen = source[key].length;
9174					var i, type, scale;
9175
9176					if (!target[key]) {
9177						target[key] = [];
9178					}
9179
9180					for (i = 0; i < slen; ++i) {
9181						scale = source[key][i];
9182						type = helpers$1.valueOrDefault(scale.type, key === 'xAxes' ? 'category' : 'linear');
9183
9184						if (i >= target[key].length) {
9185							target[key].push({});
9186						}
9187
9188						if (!target[key][i].type || (scale.type && scale.type !== target[key][i].type)) {
9189							// new/untyped scale or type changed: let's apply the new defaults
9190							// then merge source scale to correctly overwrite the defaults.
9191							helpers$1.merge(target[key][i], [core_scaleService.getScaleDefaults(type), scale]);
9192						} else {
9193							// scales type are the same
9194							helpers$1.merge(target[key][i], scale);
9195						}
9196					}
9197				} else {
9198					helpers$1._merger(key, target, source, options);
9199				}
9200			}
9201		});
9202	};
9203
9204	helpers$1.where = function(collection, filterCallback) {
9205		if (helpers$1.isArray(collection) && Array.prototype.filter) {
9206			return collection.filter(filterCallback);
9207		}
9208		var filtered = [];
9209
9210		helpers$1.each(collection, function(item) {
9211			if (filterCallback(item)) {
9212				filtered.push(item);
9213			}
9214		});
9215
9216		return filtered;
9217	};
9218	helpers$1.findIndex = Array.prototype.findIndex ?
9219		function(array, callback, scope) {
9220			return array.findIndex(callback, scope);
9221		} :
9222		function(array, callback, scope) {
9223			scope = scope === undefined ? array : scope;
9224			for (var i = 0, ilen = array.length; i < ilen; ++i) {
9225				if (callback.call(scope, array[i], i, array)) {
9226					return i;
9227				}
9228			}
9229			return -1;
9230		};
9231	helpers$1.findNextWhere = function(arrayToSearch, filterCallback, startIndex) {
9232		// Default to start of the array
9233		if (helpers$1.isNullOrUndef(startIndex)) {
9234			startIndex = -1;
9235		}
9236		for (var i = startIndex + 1; i < arrayToSearch.length; i++) {
9237			var currentItem = arrayToSearch[i];
9238			if (filterCallback(currentItem)) {
9239				return currentItem;
9240			}
9241		}
9242	};
9243	helpers$1.findPreviousWhere = function(arrayToSearch, filterCallback, startIndex) {
9244		// Default to end of the array
9245		if (helpers$1.isNullOrUndef(startIndex)) {
9246			startIndex = arrayToSearch.length;
9247		}
9248		for (var i = startIndex - 1; i >= 0; i--) {
9249			var currentItem = arrayToSearch[i];
9250			if (filterCallback(currentItem)) {
9251				return currentItem;
9252			}
9253		}
9254	};
9255
9256	// -- Math methods
9257	helpers$1.isNumber = function(n) {
9258		return !isNaN(parseFloat(n)) && isFinite(n);
9259	};
9260	helpers$1.almostEquals = function(x, y, epsilon) {
9261		return Math.abs(x - y) < epsilon;
9262	};
9263	helpers$1.almostWhole = function(x, epsilon) {
9264		var rounded = Math.round(x);
9265		return (((rounded - epsilon) < x) && ((rounded + epsilon) > x));
9266	};
9267	helpers$1.max = function(array) {
9268		return array.reduce(function(max, value) {
9269			if (!isNaN(value)) {
9270				return Math.max(max, value);
9271			}
9272			return max;
9273		}, Number.NEGATIVE_INFINITY);
9274	};
9275	helpers$1.min = function(array) {
9276		return array.reduce(function(min, value) {
9277			if (!isNaN(value)) {
9278				return Math.min(min, value);
9279			}
9280			return min;
9281		}, Number.POSITIVE_INFINITY);
9282	};
9283	helpers$1.sign = Math.sign ?
9284		function(x) {
9285			return Math.sign(x);
9286		} :
9287		function(x) {
9288			x = +x; // convert to a number
9289			if (x === 0 || isNaN(x)) {
9290				return x;
9291			}
9292			return x > 0 ? 1 : -1;
9293		};
9294	helpers$1.log10 = Math.log10 ?
9295		function(x) {
9296			return Math.log10(x);
9297		} :
9298		function(x) {
9299			var exponent = Math.log(x) * Math.LOG10E; // Math.LOG10E = 1 / Math.LN10.
9300			// Check for whole powers of 10,
9301			// which due to floating point rounding error should be corrected.
9302			var powerOf10 = Math.round(exponent);
9303			var isPowerOf10 = x === Math.pow(10, powerOf10);
9304
9305			return isPowerOf10 ? powerOf10 : exponent;
9306		};
9307	helpers$1.toRadians = function(degrees) {
9308		return degrees * (Math.PI / 180);
9309	};
9310	helpers$1.toDegrees = function(radians) {
9311		return radians * (180 / Math.PI);
9312	};
9313
9314	/**
9315	 * Returns the number of decimal places
9316	 * i.e. the number of digits after the decimal point, of the value of this Number.
9317	 * @param {Number} x - A number.
9318	 * @returns {Number} The number of decimal places.
9319	 */
9320	helpers$1.decimalPlaces = function(x) {
9321		if (!helpers$1.isFinite(x)) {
9322			return;
9323		}
9324		var e = 1;
9325		var p = 0;
9326		while (Math.round(x * e) / e !== x) {
9327			e *= 10;
9328			p++;
9329		}
9330		return p;
9331	};
9332
9333	// Gets the angle from vertical upright to the point about a centre.
9334	helpers$1.getAngleFromPoint = function(centrePoint, anglePoint) {
9335		var distanceFromXCenter = anglePoint.x - centrePoint.x;
9336		var distanceFromYCenter = anglePoint.y - centrePoint.y;
9337		var radialDistanceFromCenter = Math.sqrt(distanceFromXCenter * distanceFromXCenter + distanceFromYCenter * distanceFromYCenter);
9338
9339		var angle = Math.atan2(distanceFromYCenter, distanceFromXCenter);
9340
9341		if (angle < (-0.5 * Math.PI)) {
9342			angle += 2.0 * Math.PI; // make sure the returned angle is in the range of (-PI/2, 3PI/2]
9343		}
9344
9345		return {
9346			angle: angle,
9347			distance: radialDistanceFromCenter
9348		};
9349	};
9350	helpers$1.distanceBetweenPoints = function(pt1, pt2) {
9351		return Math.sqrt(Math.pow(pt2.x - pt1.x, 2) + Math.pow(pt2.y - pt1.y, 2));
9352	};
9353
9354	/**
9355	 * Provided for backward compatibility, not available anymore
9356	 * @function Chart.helpers.aliasPixel
9357	 * @deprecated since version 2.8.0
9358	 * @todo remove at version 3
9359	 */
9360	helpers$1.aliasPixel = function(pixelWidth) {
9361		return (pixelWidth % 2 === 0) ? 0 : 0.5;
9362	};
9363
9364	/**
9365	 * Returns the aligned pixel value to avoid anti-aliasing blur
9366	 * @param {Chart} chart - The chart instance.
9367	 * @param {Number} pixel - A pixel value.
9368	 * @param {Number} width - The width of the element.
9369	 * @returns {Number} The aligned pixel value.
9370	 * @private
9371	 */
9372	helpers$1._alignPixel = function(chart, pixel, width) {
9373		var devicePixelRatio = chart.currentDevicePixelRatio;
9374		var halfWidth = width / 2;
9375		return Math.round((pixel - halfWidth) * devicePixelRatio) / devicePixelRatio + halfWidth;
9376	};
9377
9378	helpers$1.splineCurve = function(firstPoint, middlePoint, afterPoint, t) {
9379		// Props to Rob Spencer at scaled innovation for his post on splining between points
9380		// http://scaledinnovation.com/analytics/splines/aboutSplines.html
9381
9382		// This function must also respect "skipped" points
9383
9384		var previous = firstPoint.skip ? middlePoint : firstPoint;
9385		var current = middlePoint;
9386		var next = afterPoint.skip ? middlePoint : afterPoint;
9387
9388		var d01 = Math.sqrt(Math.pow(current.x - previous.x, 2) + Math.pow(current.y - previous.y, 2));
9389		var d12 = Math.sqrt(Math.pow(next.x - current.x, 2) + Math.pow(next.y - current.y, 2));
9390
9391		var s01 = d01 / (d01 + d12);
9392		var s12 = d12 / (d01 + d12);
9393
9394		// If all points are the same, s01 & s02 will be inf
9395		s01 = isNaN(s01) ? 0 : s01;
9396		s12 = isNaN(s12) ? 0 : s12;
9397
9398		var fa = t * s01; // scaling factor for triangle Ta
9399		var fb = t * s12;
9400
9401		return {
9402			previous: {
9403				x: current.x - fa * (next.x - previous.x),
9404				y: current.y - fa * (next.y - previous.y)
9405			},
9406			next: {
9407				x: current.x + fb * (next.x - previous.x),
9408				y: current.y + fb * (next.y - previous.y)
9409			}
9410		};
9411	};
9412	helpers$1.EPSILON = Number.EPSILON || 1e-14;
9413	helpers$1.splineCurveMonotone = function(points) {
9414		// This function calculates Bézier control points in a similar way than |splineCurve|,
9415		// but preserves monotonicity of the provided data and ensures no local extremums are added
9416		// between the dataset discrete points due to the interpolation.
9417		// See : https://en.wikipedia.org/wiki/Monotone_cubic_interpolation
9418
9419		var pointsWithTangents = (points || []).map(function(point) {
9420			return {
9421				model: point._model,
9422				deltaK: 0,
9423				mK: 0
9424			};
9425		});
9426
9427		// Calculate slopes (deltaK) and initialize tangents (mK)
9428		var pointsLen = pointsWithTangents.length;
9429		var i, pointBefore, pointCurrent, pointAfter;
9430		for (i = 0; i < pointsLen; ++i) {
9431			pointCurrent = pointsWithTangents[i];
9432			if (pointCurrent.model.skip) {
9433				continue;
9434			}
9435
9436			pointBefore = i > 0 ? pointsWithTangents[i - 1] : null;
9437			pointAfter = i < pointsLen - 1 ? pointsWithTangents[i + 1] : null;
9438			if (pointAfter && !pointAfter.model.skip) {
9439				var slopeDeltaX = (pointAfter.model.x - pointCurrent.model.x);
9440
9441				// In the case of two points that appear at the same x pixel, slopeDeltaX is 0
9442				pointCurrent.deltaK = slopeDeltaX !== 0 ? (pointAfter.model.y - pointCurrent.model.y) / slopeDeltaX : 0;
9443			}
9444
9445			if (!pointBefore || pointBefore.model.skip) {
9446				pointCurrent.mK = pointCurrent.deltaK;
9447			} else if (!pointAfter || pointAfter.model.skip) {
9448				pointCurrent.mK = pointBefore.deltaK;
9449			} else if (this.sign(pointBefore.deltaK) !== this.sign(pointCurrent.deltaK)) {
9450				pointCurrent.mK = 0;
9451			} else {
9452				pointCurrent.mK = (pointBefore.deltaK + pointCurrent.deltaK) / 2;
9453			}
9454		}
9455
9456		// Adjust tangents to ensure monotonic properties
9457		var alphaK, betaK, tauK, squaredMagnitude;
9458		for (i = 0; i < pointsLen - 1; ++i) {
9459			pointCurrent = pointsWithTangents[i];
9460			pointAfter = pointsWithTangents[i + 1];
9461			if (pointCurrent.model.skip || pointAfter.model.skip) {
9462				continue;
9463			}
9464
9465			if (helpers$1.almostEquals(pointCurrent.deltaK, 0, this.EPSILON)) {
9466				pointCurrent.mK = pointAfter.mK = 0;
9467				continue;
9468			}
9469
9470			alphaK = pointCurrent.mK / pointCurrent.deltaK;
9471			betaK = pointAfter.mK / pointCurrent.deltaK;
9472			squaredMagnitude = Math.pow(alphaK, 2) + Math.pow(betaK, 2);
9473			if (squaredMagnitude <= 9) {
9474				continue;
9475			}
9476
9477			tauK = 3 / Math.sqrt(squaredMagnitude);
9478			pointCurrent.mK = alphaK * tauK * pointCurrent.deltaK;
9479			pointAfter.mK = betaK * tauK * pointCurrent.deltaK;
9480		}
9481
9482		// Compute control points
9483		var deltaX;
9484		for (i = 0; i < pointsLen; ++i) {
9485			pointCurrent = pointsWithTangents[i];
9486			if (pointCurrent.model.skip) {
9487				continue;
9488			}
9489
9490			pointBefore = i > 0 ? pointsWithTangents[i - 1] : null;
9491			pointAfter = i < pointsLen - 1 ? pointsWithTangents[i + 1] : null;
9492			if (pointBefore && !pointBefore.model.skip) {
9493				deltaX = (pointCurrent.model.x - pointBefore.model.x) / 3;
9494				pointCurrent.model.controlPointPreviousX = pointCurrent.model.x - deltaX;
9495				pointCurrent.model.controlPointPreviousY = pointCurrent.model.y - deltaX * pointCurrent.mK;
9496			}
9497			if (pointAfter && !pointAfter.model.skip) {
9498				deltaX = (pointAfter.model.x - pointCurrent.model.x) / 3;
9499				pointCurrent.model.controlPointNextX = pointCurrent.model.x + deltaX;
9500				pointCurrent.model.controlPointNextY = pointCurrent.model.y + deltaX * pointCurrent.mK;
9501			}
9502		}
9503	};
9504	helpers$1.nextItem = function(collection, index, loop) {
9505		if (loop) {
9506			return index >= collection.length - 1 ? collection[0] : collection[index + 1];
9507		}
9508		return index >= collection.length - 1 ? collection[collection.length - 1] : collection[index + 1];
9509	};
9510	helpers$1.previousItem = function(collection, index, loop) {
9511		if (loop) {
9512			return index <= 0 ? collection[collection.length - 1] : collection[index - 1];
9513		}
9514		return index <= 0 ? collection[0] : collection[index - 1];
9515	};
9516	// Implementation of the nice number algorithm used in determining where axis labels will go
9517	helpers$1.niceNum = function(range, round) {
9518		var exponent = Math.floor(helpers$1.log10(range));
9519		var fraction = range / Math.pow(10, exponent);
9520		var niceFraction;
9521
9522		if (round) {
9523			if (fraction < 1.5) {
9524				niceFraction = 1;
9525			} else if (fraction < 3) {
9526				niceFraction = 2;
9527			} else if (fraction < 7) {
9528				niceFraction = 5;
9529			} else {
9530				niceFraction = 10;
9531			}
9532		} else if (fraction <= 1.0) {
9533			niceFraction = 1;
9534		} else if (fraction <= 2) {
9535			niceFraction = 2;
9536		} else if (fraction <= 5) {
9537			niceFraction = 5;
9538		} else {
9539			niceFraction = 10;
9540		}
9541
9542		return niceFraction * Math.pow(10, exponent);
9543	};
9544	// Request animation polyfill - https://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
9545	helpers$1.requestAnimFrame = (function() {
9546		if (typeof window === 'undefined') {
9547			return function(callback) {
9548				callback();
9549			};
9550		}
9551		return window.requestAnimationFrame ||
9552			window.webkitRequestAnimationFrame ||
9553			window.mozRequestAnimationFrame ||
9554			window.oRequestAnimationFrame ||
9555			window.msRequestAnimationFrame ||
9556			function(callback) {
9557				return window.setTimeout(callback, 1000 / 60);
9558			};
9559	}());
9560	// -- DOM methods
9561	helpers$1.getRelativePosition = function(evt, chart) {
9562		var mouseX, mouseY;
9563		var e = evt.originalEvent || evt;
9564		var canvas = evt.target || evt.srcElement;
9565		var boundingRect = canvas.getBoundingClientRect();
9566
9567		var touches = e.touches;
9568		if (touches && touches.length > 0) {
9569			mouseX = touches[0].clientX;
9570			mouseY = touches[0].clientY;
9571
9572		} else {
9573			mouseX = e.clientX;
9574			mouseY = e.clientY;
9575		}
9576
9577		// Scale mouse coordinates into canvas coordinates
9578		// by following the pattern laid out by 'jerryj' in the comments of
9579		// https://www.html5canvastutorials.com/advanced/html5-canvas-mouse-coordinates/
9580		var paddingLeft = parseFloat(helpers$1.getStyle(canvas, 'padding-left'));
9581		var paddingTop = parseFloat(helpers$1.getStyle(canvas, 'padding-top'));
9582		var paddingRight = parseFloat(helpers$1.getStyle(canvas, 'padding-right'));
9583		var paddingBottom = parseFloat(helpers$1.getStyle(canvas, 'padding-bottom'));
9584		var width = boundingRect.right - boundingRect.left - paddingLeft - paddingRight;
9585		var height = boundingRect.bottom - boundingRect.top - paddingTop - paddingBottom;
9586
9587		// We divide by the current device pixel ratio, because the canvas is scaled up by that amount in each direction. However
9588		// the backend model is in unscaled coordinates. Since we are going to deal with our model coordinates, we go back here
9589		mouseX = Math.round((mouseX - boundingRect.left - paddingLeft) / (width) * canvas.width / chart.currentDevicePixelRatio);
9590		mouseY = Math.round((mouseY - boundingRect.top - paddingTop) / (height) * canvas.height / chart.currentDevicePixelRatio);
9591
9592		return {
9593			x: mouseX,
9594			y: mouseY
9595		};
9596
9597	};
9598
9599	// Private helper function to convert max-width/max-height values that may be percentages into a number
9600	function parseMaxStyle(styleValue, node, parentProperty) {
9601		var valueInPixels;
9602		if (typeof styleValue === 'string') {
9603			valueInPixels = parseInt(styleValue, 10);
9604
9605			if (styleValue.indexOf('%') !== -1) {
9606				// percentage * size in dimension
9607				valueInPixels = valueInPixels / 100 * node.parentNode[parentProperty];
9608			}
9609		} else {
9610			valueInPixels = styleValue;
9611		}
9612
9613		return valueInPixels;
9614	}
9615
9616	/**
9617	 * Returns if the given value contains an effective constraint.
9618	 * @private
9619	 */
9620	function isConstrainedValue(value) {
9621		return value !== undefined && value !== null && value !== 'none';
9622	}
9623
9624	// Private helper to get a constraint dimension
9625	// @param domNode : the node to check the constraint on
9626	// @param maxStyle : the style that defines the maximum for the direction we are using (maxWidth / maxHeight)
9627	// @param percentageProperty : property of parent to use when calculating width as a percentage
9628	// @see https://www.nathanaeljones.com/blog/2013/reading-max-width-cross-browser
9629	function getConstraintDimension(domNode, maxStyle, percentageProperty) {
9630		var view = document.defaultView;
9631		var parentNode = helpers$1._getParentNode(domNode);
9632		var constrainedNode = view.getComputedStyle(domNode)[maxStyle];
9633		var constrainedContainer = view.getComputedStyle(parentNode)[maxStyle];
9634		var hasCNode = isConstrainedValue(constrainedNode);
9635		var hasCContainer = isConstrainedValue(constrainedContainer);
9636		var infinity = Number.POSITIVE_INFINITY;
9637
9638		if (hasCNode || hasCContainer) {
9639			return Math.min(
9640				hasCNode ? parseMaxStyle(constrainedNode, domNode, percentageProperty) : infinity,
9641				hasCContainer ? parseMaxStyle(constrainedContainer, parentNode, percentageProperty) : infinity);
9642		}
9643
9644		return 'none';
9645	}
9646	// returns Number or undefined if no constraint
9647	helpers$1.getConstraintWidth = function(domNode) {
9648		return getConstraintDimension(domNode, 'max-width', 'clientWidth');
9649	};
9650	// returns Number or undefined if no constraint
9651	helpers$1.getConstraintHeight = function(domNode) {
9652		return getConstraintDimension(domNode, 'max-height', 'clientHeight');
9653	};
9654	/**
9655	 * @private
9656 	 */
9657	helpers$1._calculatePadding = function(container, padding, parentDimension) {
9658		padding = helpers$1.getStyle(container, padding);
9659
9660		return padding.indexOf('%') > -1 ? parentDimension * parseInt(padding, 10) / 100 : parseInt(padding, 10);
9661	};
9662	/**
9663	 * @private
9664	 */
9665	helpers$1._getParentNode = function(domNode) {
9666		var parent = domNode.parentNode;
9667		if (parent && parent.toString() === '[object ShadowRoot]') {
9668			parent = parent.host;
9669		}
9670		return parent;
9671	};
9672	helpers$1.getMaximumWidth = function(domNode) {
9673		var container = helpers$1._getParentNode(domNode);
9674		if (!container) {
9675			return domNode.clientWidth;
9676		}
9677
9678		var clientWidth = container.clientWidth;
9679		var paddingLeft = helpers$1._calculatePadding(container, 'padding-left', clientWidth);
9680		var paddingRight = helpers$1._calculatePadding(container, 'padding-right', clientWidth);
9681
9682		var w = clientWidth - paddingLeft - paddingRight;
9683		var cw = helpers$1.getConstraintWidth(domNode);
9684		return isNaN(cw) ? w : Math.min(w, cw);
9685	};
9686	helpers$1.getMaximumHeight = function(domNode) {
9687		var container = helpers$1._getParentNode(domNode);
9688		if (!container) {
9689			return domNode.clientHeight;
9690		}
9691
9692		var clientHeight = container.clientHeight;
9693		var paddingTop = helpers$1._calculatePadding(container, 'padding-top', clientHeight);
9694		var paddingBottom = helpers$1._calculatePadding(container, 'padding-bottom', clientHeight);
9695
9696		var h = clientHeight - paddingTop - paddingBottom;
9697		var ch = helpers$1.getConstraintHeight(domNode);
9698		return isNaN(ch) ? h : Math.min(h, ch);
9699	};
9700	helpers$1.getStyle = function(el, property) {
9701		return el.currentStyle ?
9702			el.currentStyle[property] :
9703			document.defaultView.getComputedStyle(el, null).getPropertyValue(property);
9704	};
9705	helpers$1.retinaScale = function(chart, forceRatio) {
9706		var pixelRatio = chart.currentDevicePixelRatio = forceRatio || (typeof window !== 'undefined' && window.devicePixelRatio) || 1;
9707		if (pixelRatio === 1) {
9708			return;
9709		}
9710
9711		var canvas = chart.canvas;
9712		var height = chart.height;
9713		var width = chart.width;
9714
9715		canvas.height = height * pixelRatio;
9716		canvas.width = width * pixelRatio;
9717		chart.ctx.scale(pixelRatio, pixelRatio);
9718
9719		// If no style has been set on the canvas, the render size is used as display size,
9720		// making the chart visually bigger, so let's enforce it to the "correct" values.
9721		// See https://github.com/chartjs/Chart.js/issues/3575
9722		if (!canvas.style.height && !canvas.style.width) {
9723			canvas.style.height = height + 'px';
9724			canvas.style.width = width + 'px';
9725		}
9726	};
9727	// -- Canvas methods
9728	helpers$1.fontString = function(pixelSize, fontStyle, fontFamily) {
9729		return fontStyle + ' ' + pixelSize + 'px ' + fontFamily;
9730	};
9731	helpers$1.longestText = function(ctx, font, arrayOfThings, cache) {
9732		cache = cache || {};
9733		var data = cache.data = cache.data || {};
9734		var gc = cache.garbageCollect = cache.garbageCollect || [];
9735
9736		if (cache.font !== font) {
9737			data = cache.data = {};
9738			gc = cache.garbageCollect = [];
9739			cache.font = font;
9740		}
9741
9742		ctx.font = font;
9743		var longest = 0;
9744		helpers$1.each(arrayOfThings, function(thing) {
9745			// Undefined strings and arrays should not be measured
9746			if (thing !== undefined && thing !== null && helpers$1.isArray(thing) !== true) {
9747				longest = helpers$1.measureText(ctx, data, gc, longest, thing);
9748			} else if (helpers$1.isArray(thing)) {
9749				// if it is an array lets measure each element
9750				// to do maybe simplify this function a bit so we can do this more recursively?
9751				helpers$1.each(thing, function(nestedThing) {
9752					// Undefined strings and arrays should not be measured
9753					if (nestedThing !== undefined && nestedThing !== null && !helpers$1.isArray(nestedThing)) {
9754						longest = helpers$1.measureText(ctx, data, gc, longest, nestedThing);
9755					}
9756				});
9757			}
9758		});
9759
9760		var gcLen = gc.length / 2;
9761		if (gcLen > arrayOfThings.length) {
9762			for (var i = 0; i < gcLen; i++) {
9763				delete data[gc[i]];
9764			}
9765			gc.splice(0, gcLen);
9766		}
9767		return longest;
9768	};
9769	helpers$1.measureText = function(ctx, data, gc, longest, string) {
9770		var textWidth = data[string];
9771		if (!textWidth) {
9772			textWidth = data[string] = ctx.measureText(string).width;
9773			gc.push(string);
9774		}
9775		if (textWidth > longest) {
9776			longest = textWidth;
9777		}
9778		return longest;
9779	};
9780	helpers$1.numberOfLabelLines = function(arrayOfThings) {
9781		var numberOfLines = 1;
9782		helpers$1.each(arrayOfThings, function(thing) {
9783			if (helpers$1.isArray(thing)) {
9784				if (thing.length > numberOfLines) {
9785					numberOfLines = thing.length;
9786				}
9787			}
9788		});
9789		return numberOfLines;
9790	};
9791
9792	helpers$1.color = !chartjsColor ?
9793		function(value) {
9794			console.error('Color.js not found!');
9795			return value;
9796		} :
9797		function(value) {
9798			/* global CanvasGradient */
9799			if (value instanceof CanvasGradient) {
9800				value = core_defaults.global.defaultColor;
9801			}
9802
9803			return chartjsColor(value);
9804		};
9805
9806	helpers$1.getHoverColor = function(colorValue) {
9807		/* global CanvasPattern */
9808		return (colorValue instanceof CanvasPattern || colorValue instanceof CanvasGradient) ?
9809			colorValue :
9810			helpers$1.color(colorValue).saturate(0.5).darken(0.1).rgbString();
9811	};
9812};
9813
9814/**
9815 * @namespace Chart._adapters
9816 * @since 2.8.0
9817 * @private
9818 */
9819
9820function abstract() {
9821	throw new Error(
9822		'This method is not implemented: either no adapter can ' +
9823		'be found or an incomplete integration was provided.'
9824	);
9825}
9826
9827/**
9828 * Date adapter (current used by the time scale)
9829 * @namespace Chart._adapters._date
9830 * @memberof Chart._adapters
9831 * @private
9832 */
9833
9834/**
9835 * Currently supported unit string values.
9836 * @typedef {('millisecond'|'second'|'minute'|'hour'|'day'|'week'|'month'|'quarter'|'year')}
9837 * @memberof Chart._adapters._date
9838 * @name Unit
9839 */
9840
9841/** @lends Chart._adapters._date */
9842var _date = {
9843	/**
9844	 * Returns a map of time formats for the supported units.
9845	 * @returns {{string: string}}
9846	 */
9847	formats: abstract,
9848
9849	/**
9850	 * Returns a map of date/time formats for the following presets:
9851	 * 'full': date + time + millisecond
9852	 * 'time': date + time
9853	 * 'date': date
9854	 * @returns {{string: string}}
9855	 */
9856	presets: abstract,
9857
9858	/**
9859	 * Parses the given `value` and return the associated timestamp.
9860	 * @param {any} value - the value to parse (usually comes from the data)
9861	 * @param {string} [format] - the expected data format
9862	 * @returns {(number|null)}
9863	 * @function
9864	 */
9865	parse: abstract,
9866
9867	/**
9868	 * Returns the formatted date in the specified `format` for a given `timestamp`.
9869	 * @param {number} timestamp - the timestamp to format
9870	 * @param {string} format - the date/time token
9871	 * @return {string}
9872	 * @function
9873	 */
9874	format: abstract,
9875
9876	/**
9877	 * Adds the specified `amount` of `unit` to the given `timestamp`.
9878	 * @param {number} timestamp - the input timestamp
9879	 * @param {number} amount - the amount to add
9880	 * @param {Unit} unit - the unit as string
9881	 * @return {number}
9882	 * @function
9883	 */
9884	add: abstract,
9885
9886	/**
9887	 * Returns the number of `unit` between the given timestamps.
9888	 * @param {number} max - the input timestamp (reference)
9889	 * @param {number} min - the timestamp to substract
9890	 * @param {Unit} unit - the unit as string
9891	 * @return {number}
9892	 * @function
9893	 */
9894	diff: abstract,
9895
9896	/**
9897	 * Returns start of `unit` for the given `timestamp`.
9898	 * @param {number} timestamp - the input timestamp
9899	 * @param {Unit} unit - the unit as string
9900	 * @param {number} [weekday] - the ISO day of the week with 1 being Monday
9901	 * and 7 being Sunday (only needed if param *unit* is `isoWeek`).
9902	 * @function
9903	 */
9904	startOf: abstract,
9905
9906	/**
9907	 * Returns end of `unit` for the given `timestamp`.
9908	 * @param {number} timestamp - the input timestamp
9909	 * @param {Unit} unit - the unit as string
9910	 * @function
9911	 */
9912	endOf: abstract,
9913
9914	// DEPRECATIONS
9915
9916	/**
9917	 * Provided for backward compatibility for scale.getValueForPixel(),
9918	 * this method should be overridden only by the moment adapter.
9919	 * @deprecated since version 2.8.0
9920	 * @todo remove at version 3
9921	 * @private
9922	 */
9923	_create: function(value) {
9924		return value;
9925	}
9926};
9927
9928var core_adapters = {
9929	_date: _date
9930};
9931
9932/**
9933 * Namespace to hold static tick generation functions
9934 * @namespace Chart.Ticks
9935 */
9936var core_ticks = {
9937	/**
9938	 * Namespace to hold formatters for different types of ticks
9939	 * @namespace Chart.Ticks.formatters
9940	 */
9941	formatters: {
9942		/**
9943		 * Formatter for value labels
9944		 * @method Chart.Ticks.formatters.values
9945		 * @param value the value to display
9946		 * @return {String|Array} the label to display
9947		 */
9948		values: function(value) {
9949			return helpers$1.isArray(value) ? value : '' + value;
9950		},
9951
9952		/**
9953		 * Formatter for linear numeric ticks
9954		 * @method Chart.Ticks.formatters.linear
9955		 * @param tickValue {Number} the value to be formatted
9956		 * @param index {Number} the position of the tickValue parameter in the ticks array
9957		 * @param ticks {Array<Number>} the list of ticks being converted
9958		 * @return {String} string representation of the tickValue parameter
9959		 */
9960		linear: function(tickValue, index, ticks) {
9961			// If we have lots of ticks, don't use the ones
9962			var delta = ticks.length > 3 ? ticks[2] - ticks[1] : ticks[1] - ticks[0];
9963
9964			// If we have a number like 2.5 as the delta, figure out how many decimal places we need
9965			if (Math.abs(delta) > 1) {
9966				if (tickValue !== Math.floor(tickValue)) {
9967					// not an integer
9968					delta = tickValue - Math.floor(tickValue);
9969				}
9970			}
9971
9972			var logDelta = helpers$1.log10(Math.abs(delta));
9973			var tickString = '';
9974
9975			if (tickValue !== 0) {
9976				var maxTick = Math.max(Math.abs(ticks[0]), Math.abs(ticks[ticks.length - 1]));
9977				if (maxTick < 1e-4) { // all ticks are small numbers; use scientific notation
9978					var logTick = helpers$1.log10(Math.abs(tickValue));
9979					tickString = tickValue.toExponential(Math.floor(logTick) - Math.floor(logDelta));
9980				} else {
9981					var numDecimal = -1 * Math.floor(logDelta);
9982					numDecimal = Math.max(Math.min(numDecimal, 20), 0); // toFixed has a max of 20 decimal places
9983					tickString = tickValue.toFixed(numDecimal);
9984				}
9985			} else {
9986				tickString = '0'; // never show decimal places for 0
9987			}
9988
9989			return tickString;
9990		},
9991
9992		logarithmic: function(tickValue, index, ticks) {
9993			var remain = tickValue / (Math.pow(10, Math.floor(helpers$1.log10(tickValue))));
9994
9995			if (tickValue === 0) {
9996				return '0';
9997			} else if (remain === 1 || remain === 2 || remain === 5 || index === 0 || index === ticks.length - 1) {
9998				return tickValue.toExponential();
9999			}
10000			return '';
10001		}
10002	}
10003};
10004
10005var valueOrDefault$7 = helpers$1.valueOrDefault;
10006var valueAtIndexOrDefault = helpers$1.valueAtIndexOrDefault;
10007
10008core_defaults._set('scale', {
10009	display: true,
10010	position: 'left',
10011	offset: false,
10012
10013	// grid line settings
10014	gridLines: {
10015		display: true,
10016		color: 'rgba(0, 0, 0, 0.1)',
10017		lineWidth: 1,
10018		drawBorder: true,
10019		drawOnChartArea: true,
10020		drawTicks: true,
10021		tickMarkLength: 10,
10022		zeroLineWidth: 1,
10023		zeroLineColor: 'rgba(0,0,0,0.25)',
10024		zeroLineBorderDash: [],
10025		zeroLineBorderDashOffset: 0.0,
10026		offsetGridLines: false,
10027		borderDash: [],
10028		borderDashOffset: 0.0
10029	},
10030
10031	// scale label
10032	scaleLabel: {
10033		// display property
10034		display: false,
10035
10036		// actual label
10037		labelString: '',
10038
10039		// top/bottom padding
10040		padding: {
10041			top: 4,
10042			bottom: 4
10043		}
10044	},
10045
10046	// label settings
10047	ticks: {
10048		beginAtZero: false,
10049		minRotation: 0,
10050		maxRotation: 50,
10051		mirror: false,
10052		padding: 0,
10053		reverse: false,
10054		display: true,
10055		autoSkip: true,
10056		autoSkipPadding: 0,
10057		labelOffset: 0,
10058		// We pass through arrays to be rendered as multiline labels, we convert Others to strings here.
10059		callback: core_ticks.formatters.values,
10060		minor: {},
10061		major: {}
10062	}
10063});
10064
10065function labelsFromTicks(ticks) {
10066	var labels = [];
10067	var i, ilen;
10068
10069	for (i = 0, ilen = ticks.length; i < ilen; ++i) {
10070		labels.push(ticks[i].label);
10071	}
10072
10073	return labels;
10074}
10075
10076function getPixelForGridLine(scale, index, offsetGridLines) {
10077	var lineValue = scale.getPixelForTick(index);
10078
10079	if (offsetGridLines) {
10080		if (scale.getTicks().length === 1) {
10081			lineValue -= scale.isHorizontal() ?
10082				Math.max(lineValue - scale.left, scale.right - lineValue) :
10083				Math.max(lineValue - scale.top, scale.bottom - lineValue);
10084		} else if (index === 0) {
10085			lineValue -= (scale.getPixelForTick(1) - lineValue) / 2;
10086		} else {
10087			lineValue -= (lineValue - scale.getPixelForTick(index - 1)) / 2;
10088		}
10089	}
10090	return lineValue;
10091}
10092
10093function computeTextSize(context, tick, font) {
10094	return helpers$1.isArray(tick) ?
10095		helpers$1.longestText(context, font, tick) :
10096		context.measureText(tick).width;
10097}
10098
10099var core_scale = core_element.extend({
10100	/**
10101	 * Get the padding needed for the scale
10102	 * @method getPadding
10103	 * @private
10104	 * @returns {Padding} the necessary padding
10105	 */
10106	getPadding: function() {
10107		var me = this;
10108		return {
10109			left: me.paddingLeft || 0,
10110			top: me.paddingTop || 0,
10111			right: me.paddingRight || 0,
10112			bottom: me.paddingBottom || 0
10113		};
10114	},
10115
10116	/**
10117	 * Returns the scale tick objects ({label, major})
10118	 * @since 2.7
10119	 */
10120	getTicks: function() {
10121		return this._ticks;
10122	},
10123
10124	// These methods are ordered by lifecyle. Utilities then follow.
10125	// Any function defined here is inherited by all scale types.
10126	// Any function can be extended by the scale type
10127
10128	mergeTicksOptions: function() {
10129		var ticks = this.options.ticks;
10130		if (ticks.minor === false) {
10131			ticks.minor = {
10132				display: false
10133			};
10134		}
10135		if (ticks.major === false) {
10136			ticks.major = {
10137				display: false
10138			};
10139		}
10140		for (var key in ticks) {
10141			if (key !== 'major' && key !== 'minor') {
10142				if (typeof ticks.minor[key] === 'undefined') {
10143					ticks.minor[key] = ticks[key];
10144				}
10145				if (typeof ticks.major[key] === 'undefined') {
10146					ticks.major[key] = ticks[key];
10147				}
10148			}
10149		}
10150	},
10151	beforeUpdate: function() {
10152		helpers$1.callback(this.options.beforeUpdate, [this]);
10153	},
10154
10155	update: function(maxWidth, maxHeight, margins) {
10156		var me = this;
10157		var i, ilen, labels, label, ticks, tick;
10158
10159		// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
10160		me.beforeUpdate();
10161
10162		// Absorb the master measurements
10163		me.maxWidth = maxWidth;
10164		me.maxHeight = maxHeight;
10165		me.margins = helpers$1.extend({
10166			left: 0,
10167			right: 0,
10168			top: 0,
10169			bottom: 0
10170		}, margins);
10171		me.longestTextCache = me.longestTextCache || {};
10172
10173		// Dimensions
10174		me.beforeSetDimensions();
10175		me.setDimensions();
10176		me.afterSetDimensions();
10177
10178		// Data min/max
10179		me.beforeDataLimits();
10180		me.determineDataLimits();
10181		me.afterDataLimits();
10182
10183		// Ticks - `this.ticks` is now DEPRECATED!
10184		// Internal ticks are now stored as objects in the PRIVATE `this._ticks` member
10185		// and must not be accessed directly from outside this class. `this.ticks` being
10186		// around for long time and not marked as private, we can't change its structure
10187		// without unexpected breaking changes. If you need to access the scale ticks,
10188		// use scale.getTicks() instead.
10189
10190		me.beforeBuildTicks();
10191
10192		// New implementations should return an array of objects but for BACKWARD COMPAT,
10193		// we still support no return (`this.ticks` internally set by calling this method).
10194		ticks = me.buildTicks() || [];
10195
10196		// Allow modification of ticks in callback.
10197		ticks = me.afterBuildTicks(ticks) || ticks;
10198
10199		me.beforeTickToLabelConversion();
10200
10201		// New implementations should return the formatted tick labels but for BACKWARD
10202		// COMPAT, we still support no return (`this.ticks` internally changed by calling
10203		// this method and supposed to contain only string values).
10204		labels = me.convertTicksToLabels(ticks) || me.ticks;
10205
10206		me.afterTickToLabelConversion();
10207
10208		me.ticks = labels;   // BACKWARD COMPATIBILITY
10209
10210		// IMPORTANT: from this point, we consider that `this.ticks` will NEVER change!
10211
10212		// BACKWARD COMPAT: synchronize `_ticks` with labels (so potentially `this.ticks`)
10213		for (i = 0, ilen = labels.length; i < ilen; ++i) {
10214			label = labels[i];
10215			tick = ticks[i];
10216			if (!tick) {
10217				ticks.push(tick = {
10218					label: label,
10219					major: false
10220				});
10221			} else {
10222				tick.label = label;
10223			}
10224		}
10225
10226		me._ticks = ticks;
10227
10228		// Tick Rotation
10229		me.beforeCalculateTickRotation();
10230		me.calculateTickRotation();
10231		me.afterCalculateTickRotation();
10232		// Fit
10233		me.beforeFit();
10234		me.fit();
10235		me.afterFit();
10236		//
10237		me.afterUpdate();
10238
10239		return me.minSize;
10240
10241	},
10242	afterUpdate: function() {
10243		helpers$1.callback(this.options.afterUpdate, [this]);
10244	},
10245
10246	//
10247
10248	beforeSetDimensions: function() {
10249		helpers$1.callback(this.options.beforeSetDimensions, [this]);
10250	},
10251	setDimensions: function() {
10252		var me = this;
10253		// Set the unconstrained dimension before label rotation
10254		if (me.isHorizontal()) {
10255			// Reset position before calculating rotation
10256			me.width = me.maxWidth;
10257			me.left = 0;
10258			me.right = me.width;
10259		} else {
10260			me.height = me.maxHeight;
10261
10262			// Reset position before calculating rotation
10263			me.top = 0;
10264			me.bottom = me.height;
10265		}
10266
10267		// Reset padding
10268		me.paddingLeft = 0;
10269		me.paddingTop = 0;
10270		me.paddingRight = 0;
10271		me.paddingBottom = 0;
10272	},
10273	afterSetDimensions: function() {
10274		helpers$1.callback(this.options.afterSetDimensions, [this]);
10275	},
10276
10277	// Data limits
10278	beforeDataLimits: function() {
10279		helpers$1.callback(this.options.beforeDataLimits, [this]);
10280	},
10281	determineDataLimits: helpers$1.noop,
10282	afterDataLimits: function() {
10283		helpers$1.callback(this.options.afterDataLimits, [this]);
10284	},
10285
10286	//
10287	beforeBuildTicks: function() {
10288		helpers$1.callback(this.options.beforeBuildTicks, [this]);
10289	},
10290	buildTicks: helpers$1.noop,
10291	afterBuildTicks: function(ticks) {
10292		var me = this;
10293		// ticks is empty for old axis implementations here
10294		if (helpers$1.isArray(ticks) && ticks.length) {
10295			return helpers$1.callback(me.options.afterBuildTicks, [me, ticks]);
10296		}
10297		// Support old implementations (that modified `this.ticks` directly in buildTicks)
10298		me.ticks = helpers$1.callback(me.options.afterBuildTicks, [me, me.ticks]) || me.ticks;
10299		return ticks;
10300	},
10301
10302	beforeTickToLabelConversion: function() {
10303		helpers$1.callback(this.options.beforeTickToLabelConversion, [this]);
10304	},
10305	convertTicksToLabels: function() {
10306		var me = this;
10307		// Convert ticks to strings
10308		var tickOpts = me.options.ticks;
10309		me.ticks = me.ticks.map(tickOpts.userCallback || tickOpts.callback, this);
10310	},
10311	afterTickToLabelConversion: function() {
10312		helpers$1.callback(this.options.afterTickToLabelConversion, [this]);
10313	},
10314
10315	//
10316
10317	beforeCalculateTickRotation: function() {
10318		helpers$1.callback(this.options.beforeCalculateTickRotation, [this]);
10319	},
10320	calculateTickRotation: function() {
10321		var me = this;
10322		var context = me.ctx;
10323		var tickOpts = me.options.ticks;
10324		var labels = labelsFromTicks(me._ticks);
10325
10326		// Get the width of each grid by calculating the difference
10327		// between x offsets between 0 and 1.
10328		var tickFont = helpers$1.options._parseFont(tickOpts);
10329		context.font = tickFont.string;
10330
10331		var labelRotation = tickOpts.minRotation || 0;
10332
10333		if (labels.length && me.options.display && me.isHorizontal()) {
10334			var originalLabelWidth = helpers$1.longestText(context, tickFont.string, labels, me.longestTextCache);
10335			var labelWidth = originalLabelWidth;
10336			var cosRotation, sinRotation;
10337
10338			// Allow 3 pixels x2 padding either side for label readability
10339			var tickWidth = me.getPixelForTick(1) - me.getPixelForTick(0) - 6;
10340
10341			// Max label rotation can be set or default to 90 - also act as a loop counter
10342			while (labelWidth > tickWidth && labelRotation < tickOpts.maxRotation) {
10343				var angleRadians = helpers$1.toRadians(labelRotation);
10344				cosRotation = Math.cos(angleRadians);
10345				sinRotation = Math.sin(angleRadians);
10346
10347				if (sinRotation * originalLabelWidth > me.maxHeight) {
10348					// go back one step
10349					labelRotation--;
10350					break;
10351				}
10352
10353				labelRotation++;
10354				labelWidth = cosRotation * originalLabelWidth;
10355			}
10356		}
10357
10358		me.labelRotation = labelRotation;
10359	},
10360	afterCalculateTickRotation: function() {
10361		helpers$1.callback(this.options.afterCalculateTickRotation, [this]);
10362	},
10363
10364	//
10365
10366	beforeFit: function() {
10367		helpers$1.callback(this.options.beforeFit, [this]);
10368	},
10369	fit: function() {
10370		var me = this;
10371		// Reset
10372		var minSize = me.minSize = {
10373			width: 0,
10374			height: 0
10375		};
10376
10377		var labels = labelsFromTicks(me._ticks);
10378
10379		var opts = me.options;
10380		var tickOpts = opts.ticks;
10381		var scaleLabelOpts = opts.scaleLabel;
10382		var gridLineOpts = opts.gridLines;
10383		var display = me._isVisible();
10384		var position = opts.position;
10385		var isHorizontal = me.isHorizontal();
10386
10387		var parseFont = helpers$1.options._parseFont;
10388		var tickFont = parseFont(tickOpts);
10389		var tickMarkLength = opts.gridLines.tickMarkLength;
10390
10391		// Width
10392		if (isHorizontal) {
10393			// subtract the margins to line up with the chartArea if we are a full width scale
10394			minSize.width = me.isFullWidth() ? me.maxWidth - me.margins.left - me.margins.right : me.maxWidth;
10395		} else {
10396			minSize.width = display && gridLineOpts.drawTicks ? tickMarkLength : 0;
10397		}
10398
10399		// height
10400		if (isHorizontal) {
10401			minSize.height = display && gridLineOpts.drawTicks ? tickMarkLength : 0;
10402		} else {
10403			minSize.height = me.maxHeight; // fill all the height
10404		}
10405
10406		// Are we showing a title for the scale?
10407		if (scaleLabelOpts.display && display) {
10408			var scaleLabelFont = parseFont(scaleLabelOpts);
10409			var scaleLabelPadding = helpers$1.options.toPadding(scaleLabelOpts.padding);
10410			var deltaHeight = scaleLabelFont.lineHeight + scaleLabelPadding.height;
10411
10412			if (isHorizontal) {
10413				minSize.height += deltaHeight;
10414			} else {
10415				minSize.width += deltaHeight;
10416			}
10417		}
10418
10419		// Don't bother fitting the ticks if we are not showing them
10420		if (tickOpts.display && display) {
10421			var largestTextWidth = helpers$1.longestText(me.ctx, tickFont.string, labels, me.longestTextCache);
10422			var tallestLabelHeightInLines = helpers$1.numberOfLabelLines(labels);
10423			var lineSpace = tickFont.size * 0.5;
10424			var tickPadding = me.options.ticks.padding;
10425
10426			// Store max number of lines used in labels for _autoSkip
10427			me._maxLabelLines = tallestLabelHeightInLines;
10428
10429			if (isHorizontal) {
10430				// A horizontal axis is more constrained by the height.
10431				me.longestLabelWidth = largestTextWidth;
10432
10433				var angleRadians = helpers$1.toRadians(me.labelRotation);
10434				var cosRotation = Math.cos(angleRadians);
10435				var sinRotation = Math.sin(angleRadians);
10436
10437				// TODO - improve this calculation
10438				var labelHeight = (sinRotation * largestTextWidth)
10439					+ (tickFont.lineHeight * tallestLabelHeightInLines)
10440					+ lineSpace; // padding
10441
10442				minSize.height = Math.min(me.maxHeight, minSize.height + labelHeight + tickPadding);
10443
10444				me.ctx.font = tickFont.string;
10445				var firstLabelWidth = computeTextSize(me.ctx, labels[0], tickFont.string);
10446				var lastLabelWidth = computeTextSize(me.ctx, labels[labels.length - 1], tickFont.string);
10447				var offsetLeft = me.getPixelForTick(0) - me.left;
10448				var offsetRight = me.right - me.getPixelForTick(labels.length - 1);
10449				var paddingLeft, paddingRight;
10450
10451				// Ensure that our ticks are always inside the canvas. When rotated, ticks are right aligned
10452				// which means that the right padding is dominated by the font height
10453				if (me.labelRotation !== 0) {
10454					paddingLeft = position === 'bottom' ? (cosRotation * firstLabelWidth) : (cosRotation * lineSpace);
10455					paddingRight = position === 'bottom' ? (cosRotation * lineSpace) : (cosRotation * lastLabelWidth);
10456				} else {
10457					paddingLeft = firstLabelWidth / 2;
10458					paddingRight = lastLabelWidth / 2;
10459				}
10460				me.paddingLeft = Math.max(paddingLeft - offsetLeft, 0) + 3; // add 3 px to move away from canvas edges
10461				me.paddingRight = Math.max(paddingRight - offsetRight, 0) + 3;
10462			} else {
10463				// A vertical axis is more constrained by the width. Labels are the
10464				// dominant factor here, so get that length first and account for padding
10465				if (tickOpts.mirror) {
10466					largestTextWidth = 0;
10467				} else {
10468					// use lineSpace for consistency with horizontal axis
10469					// tickPadding is not implemented for horizontal
10470					largestTextWidth += tickPadding + lineSpace;
10471				}
10472
10473				minSize.width = Math.min(me.maxWidth, minSize.width + largestTextWidth);
10474
10475				me.paddingTop = tickFont.size / 2;
10476				me.paddingBottom = tickFont.size / 2;
10477			}
10478		}
10479
10480		me.handleMargins();
10481
10482		me.width = minSize.width;
10483		me.height = minSize.height;
10484	},
10485
10486	/**
10487	 * Handle margins and padding interactions
10488	 * @private
10489	 */
10490	handleMargins: function() {
10491		var me = this;
10492		if (me.margins) {
10493			me.paddingLeft = Math.max(me.paddingLeft - me.margins.left, 0);
10494			me.paddingTop = Math.max(me.paddingTop - me.margins.top, 0);
10495			me.paddingRight = Math.max(me.paddingRight - me.margins.right, 0);
10496			me.paddingBottom = Math.max(me.paddingBottom - me.margins.bottom, 0);
10497		}
10498	},
10499
10500	afterFit: function() {
10501		helpers$1.callback(this.options.afterFit, [this]);
10502	},
10503
10504	// Shared Methods
10505	isHorizontal: function() {
10506		return this.options.position === 'top' || this.options.position === 'bottom';
10507	},
10508	isFullWidth: function() {
10509		return (this.options.fullWidth);
10510	},
10511
10512	// Get the correct value. NaN bad inputs, If the value type is object get the x or y based on whether we are horizontal or not
10513	getRightValue: function(rawValue) {
10514		// Null and undefined values first
10515		if (helpers$1.isNullOrUndef(rawValue)) {
10516			return NaN;
10517		}
10518		// isNaN(object) returns true, so make sure NaN is checking for a number; Discard Infinite values
10519		if ((typeof rawValue === 'number' || rawValue instanceof Number) && !isFinite(rawValue)) {
10520			return NaN;
10521		}
10522		// If it is in fact an object, dive in one more level
10523		if (rawValue) {
10524			if (this.isHorizontal()) {
10525				if (rawValue.x !== undefined) {
10526					return this.getRightValue(rawValue.x);
10527				}
10528			} else if (rawValue.y !== undefined) {
10529				return this.getRightValue(rawValue.y);
10530			}
10531		}
10532
10533		// Value is good, return it
10534		return rawValue;
10535	},
10536
10537	/**
10538	 * Used to get the value to display in the tooltip for the data at the given index
10539	 * @param index
10540	 * @param datasetIndex
10541	 */
10542	getLabelForIndex: helpers$1.noop,
10543
10544	/**
10545	 * Returns the location of the given data point. Value can either be an index or a numerical value
10546	 * The coordinate (0, 0) is at the upper-left corner of the canvas
10547	 * @param value
10548	 * @param index
10549	 * @param datasetIndex
10550	 */
10551	getPixelForValue: helpers$1.noop,
10552
10553	/**
10554	 * Used to get the data value from a given pixel. This is the inverse of getPixelForValue
10555	 * The coordinate (0, 0) is at the upper-left corner of the canvas
10556	 * @param pixel
10557	 */
10558	getValueForPixel: helpers$1.noop,
10559
10560	/**
10561	 * Returns the location of the tick at the given index
10562	 * The coordinate (0, 0) is at the upper-left corner of the canvas
10563	 */
10564	getPixelForTick: function(index) {
10565		var me = this;
10566		var offset = me.options.offset;
10567		if (me.isHorizontal()) {
10568			var innerWidth = me.width - (me.paddingLeft + me.paddingRight);
10569			var tickWidth = innerWidth / Math.max((me._ticks.length - (offset ? 0 : 1)), 1);
10570			var pixel = (tickWidth * index) + me.paddingLeft;
10571
10572			if (offset) {
10573				pixel += tickWidth / 2;
10574			}
10575
10576			var finalVal = me.left + pixel;
10577			finalVal += me.isFullWidth() ? me.margins.left : 0;
10578			return finalVal;
10579		}
10580		var innerHeight = me.height - (me.paddingTop + me.paddingBottom);
10581		return me.top + (index * (innerHeight / (me._ticks.length - 1)));
10582	},
10583
10584	/**
10585	 * Utility for getting the pixel location of a percentage of scale
10586	 * The coordinate (0, 0) is at the upper-left corner of the canvas
10587	 */
10588	getPixelForDecimal: function(decimal) {
10589		var me = this;
10590		if (me.isHorizontal()) {
10591			var innerWidth = me.width - (me.paddingLeft + me.paddingRight);
10592			var valueOffset = (innerWidth * decimal) + me.paddingLeft;
10593
10594			var finalVal = me.left + valueOffset;
10595			finalVal += me.isFullWidth() ? me.margins.left : 0;
10596			return finalVal;
10597		}
10598		return me.top + (decimal * me.height);
10599	},
10600
10601	/**
10602	 * Returns the pixel for the minimum chart value
10603	 * The coordinate (0, 0) is at the upper-left corner of the canvas
10604	 */
10605	getBasePixel: function() {
10606		return this.getPixelForValue(this.getBaseValue());
10607	},
10608
10609	getBaseValue: function() {
10610		var me = this;
10611		var min = me.min;
10612		var max = me.max;
10613
10614		return me.beginAtZero ? 0 :
10615			min < 0 && max < 0 ? max :
10616			min > 0 && max > 0 ? min :
10617			0;
10618	},
10619
10620	/**
10621	 * Returns a subset of ticks to be plotted to avoid overlapping labels.
10622	 * @private
10623	 */
10624	_autoSkip: function(ticks) {
10625		var skipRatio;
10626		var me = this;
10627		var isHorizontal = me.isHorizontal();
10628		var optionTicks = me.options.ticks.minor;
10629		var tickCount = ticks.length;
10630
10631		// Calculate space needed by label in axis direction.
10632		var rot = helpers$1.toRadians(me.labelRotation);
10633		var cos = Math.abs(Math.cos(rot));
10634		var sin = Math.abs(Math.sin(rot));
10635
10636		var padding = optionTicks.autoSkipPadding;
10637		var w = me.longestLabelWidth + padding || 0;
10638
10639		var tickFont = helpers$1.options._parseFont(optionTicks);
10640		var h = me._maxLabelLines * tickFont.lineHeight + padding;
10641
10642		// Calculate space needed for 1 tick in axis direction.
10643		var tickSize = isHorizontal
10644			? h * cos > w * sin ? w / cos : h / sin
10645			: h * sin < w * cos ? h / cos : w / sin;
10646
10647		// Total space needed to display all ticks. First and last ticks are
10648		// drawn as their center at end of axis, so tickCount-1
10649		var ticksLength = tickSize * (tickCount - 1);
10650
10651		// Axis length
10652		var axisLength = isHorizontal
10653			? me.width - (me.paddingLeft + me.paddingRight)
10654			: me.height - (me.paddingTop + me.PaddingBottom);
10655
10656		var result = [];
10657		var i, tick;
10658
10659		// figure out the maximum number of gridlines to show
10660		var maxTicks;
10661		if (optionTicks.maxTicksLimit) {
10662			maxTicks = optionTicks.maxTicksLimit;
10663		}
10664
10665		skipRatio = false;
10666
10667		if (ticksLength > axisLength) {
10668			skipRatio = 1 + Math.floor(ticksLength / axisLength);
10669		}
10670
10671		// if they defined a max number of optionTicks,
10672		// increase skipRatio until that number is met
10673		if (maxTicks && tickCount > maxTicks) {
10674			skipRatio = Math.max(skipRatio, 1 + Math.floor(tickCount / maxTicks));
10675		}
10676
10677		for (i = 0; i < tickCount; i++) {
10678			tick = ticks[i];
10679
10680			if (skipRatio > 1 && i % skipRatio > 0) {
10681				// leave tick in place but make sure it's not displayed (#4635)
10682				delete tick.label;
10683			}
10684			result.push(tick);
10685		}
10686		return result;
10687	},
10688
10689	/**
10690	 * @private
10691	 */
10692	_isVisible: function() {
10693		var me = this;
10694		var chart = me.chart;
10695		var display = me.options.display;
10696		var i, ilen, meta;
10697
10698		if (display !== 'auto') {
10699			return !!display;
10700		}
10701
10702		// When 'auto', the scale is visible if at least one associated dataset is visible.
10703		for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
10704			if (chart.isDatasetVisible(i)) {
10705				meta = chart.getDatasetMeta(i);
10706				if (meta.xAxisID === me.id || meta.yAxisID === me.id) {
10707					return true;
10708				}
10709			}
10710		}
10711
10712		return false;
10713	},
10714
10715	// Actually draw the scale on the canvas
10716	// @param {rectangle} chartArea : the area of the chart to draw full grid lines on
10717	draw: function(chartArea) {
10718		var me = this;
10719		var options = me.options;
10720
10721		if (!me._isVisible()) {
10722			return;
10723		}
10724
10725		var chart = me.chart;
10726		var context = me.ctx;
10727		var globalDefaults = core_defaults.global;
10728		var defaultFontColor = globalDefaults.defaultFontColor;
10729		var optionTicks = options.ticks.minor;
10730		var optionMajorTicks = options.ticks.major || optionTicks;
10731		var gridLines = options.gridLines;
10732		var scaleLabel = options.scaleLabel;
10733		var position = options.position;
10734
10735		var isRotated = me.labelRotation !== 0;
10736		var isMirrored = optionTicks.mirror;
10737		var isHorizontal = me.isHorizontal();
10738
10739		var parseFont = helpers$1.options._parseFont;
10740		var ticks = optionTicks.autoSkip ? me._autoSkip(me.getTicks()) : me.getTicks();
10741		var tickFontColor = valueOrDefault$7(optionTicks.fontColor, defaultFontColor);
10742		var tickFont = parseFont(optionTicks);
10743		var lineHeight = tickFont.lineHeight;
10744		var majorTickFontColor = valueOrDefault$7(optionMajorTicks.fontColor, defaultFontColor);
10745		var majorTickFont = parseFont(optionMajorTicks);
10746		var tickPadding = optionTicks.padding;
10747		var labelOffset = optionTicks.labelOffset;
10748
10749		var tl = gridLines.drawTicks ? gridLines.tickMarkLength : 0;
10750
10751		var scaleLabelFontColor = valueOrDefault$7(scaleLabel.fontColor, defaultFontColor);
10752		var scaleLabelFont = parseFont(scaleLabel);
10753		var scaleLabelPadding = helpers$1.options.toPadding(scaleLabel.padding);
10754		var labelRotationRadians = helpers$1.toRadians(me.labelRotation);
10755
10756		var itemsToDraw = [];
10757
10758		var axisWidth = gridLines.drawBorder ? valueAtIndexOrDefault(gridLines.lineWidth, 0, 0) : 0;
10759		var alignPixel = helpers$1._alignPixel;
10760		var borderValue, tickStart, tickEnd;
10761
10762		if (position === 'top') {
10763			borderValue = alignPixel(chart, me.bottom, axisWidth);
10764			tickStart = me.bottom - tl;
10765			tickEnd = borderValue - axisWidth / 2;
10766		} else if (position === 'bottom') {
10767			borderValue = alignPixel(chart, me.top, axisWidth);
10768			tickStart = borderValue + axisWidth / 2;
10769			tickEnd = me.top + tl;
10770		} else if (position === 'left') {
10771			borderValue = alignPixel(chart, me.right, axisWidth);
10772			tickStart = me.right - tl;
10773			tickEnd = borderValue - axisWidth / 2;
10774		} else {
10775			borderValue = alignPixel(chart, me.left, axisWidth);
10776			tickStart = borderValue + axisWidth / 2;
10777			tickEnd = me.left + tl;
10778		}
10779
10780		var epsilon = 0.0000001; // 0.0000001 is margin in pixels for Accumulated error.
10781
10782		helpers$1.each(ticks, function(tick, index) {
10783			// autoskipper skipped this tick (#4635)
10784			if (helpers$1.isNullOrUndef(tick.label)) {
10785				return;
10786			}
10787
10788			var label = tick.label;
10789			var lineWidth, lineColor, borderDash, borderDashOffset;
10790			if (index === me.zeroLineIndex && options.offset === gridLines.offsetGridLines) {
10791				// Draw the first index specially
10792				lineWidth = gridLines.zeroLineWidth;
10793				lineColor = gridLines.zeroLineColor;
10794				borderDash = gridLines.zeroLineBorderDash || [];
10795				borderDashOffset = gridLines.zeroLineBorderDashOffset || 0.0;
10796			} else {
10797				lineWidth = valueAtIndexOrDefault(gridLines.lineWidth, index);
10798				lineColor = valueAtIndexOrDefault(gridLines.color, index);
10799				borderDash = gridLines.borderDash || [];
10800				borderDashOffset = gridLines.borderDashOffset || 0.0;
10801			}
10802
10803			// Common properties
10804			var tx1, ty1, tx2, ty2, x1, y1, x2, y2, labelX, labelY, textOffset, textAlign;
10805			var labelCount = helpers$1.isArray(label) ? label.length : 1;
10806			var lineValue = getPixelForGridLine(me, index, gridLines.offsetGridLines);
10807
10808			if (isHorizontal) {
10809				var labelYOffset = tl + tickPadding;
10810
10811				if (lineValue < me.left - epsilon) {
10812					lineColor = 'rgba(0,0,0,0)';
10813				}
10814
10815				tx1 = tx2 = x1 = x2 = alignPixel(chart, lineValue, lineWidth);
10816				ty1 = tickStart;
10817				ty2 = tickEnd;
10818				labelX = me.getPixelForTick(index) + labelOffset; // x values for optionTicks (need to consider offsetLabel option)
10819
10820				if (position === 'top') {
10821					y1 = alignPixel(chart, chartArea.top, axisWidth) + axisWidth / 2;
10822					y2 = chartArea.bottom;
10823					textOffset = ((!isRotated ? 0.5 : 1) - labelCount) * lineHeight;
10824					textAlign = !isRotated ? 'center' : 'left';
10825					labelY = me.bottom - labelYOffset;
10826				} else {
10827					y1 = chartArea.top;
10828					y2 = alignPixel(chart, chartArea.bottom, axisWidth) - axisWidth / 2;
10829					textOffset = (!isRotated ? 0.5 : 0) * lineHeight;
10830					textAlign = !isRotated ? 'center' : 'right';
10831					labelY = me.top + labelYOffset;
10832				}
10833			} else {
10834				var labelXOffset = (isMirrored ? 0 : tl) + tickPadding;
10835
10836				if (lineValue < me.top - epsilon) {
10837					lineColor = 'rgba(0,0,0,0)';
10838				}
10839
10840				tx1 = tickStart;
10841				tx2 = tickEnd;
10842				ty1 = ty2 = y1 = y2 = alignPixel(chart, lineValue, lineWidth);
10843				labelY = me.getPixelForTick(index) + labelOffset;
10844				textOffset = (1 - labelCount) * lineHeight / 2;
10845
10846				if (position === 'left') {
10847					x1 = alignPixel(chart, chartArea.left, axisWidth) + axisWidth / 2;
10848					x2 = chartArea.right;
10849					textAlign = isMirrored ? 'left' : 'right';
10850					labelX = me.right - labelXOffset;
10851				} else {
10852					x1 = chartArea.left;
10853					x2 = alignPixel(chart, chartArea.right, axisWidth) - axisWidth / 2;
10854					textAlign = isMirrored ? 'right' : 'left';
10855					labelX = me.left + labelXOffset;
10856				}
10857			}
10858
10859			itemsToDraw.push({
10860				tx1: tx1,
10861				ty1: ty1,
10862				tx2: tx2,
10863				ty2: ty2,
10864				x1: x1,
10865				y1: y1,
10866				x2: x2,
10867				y2: y2,
10868				labelX: labelX,
10869				labelY: labelY,
10870				glWidth: lineWidth,
10871				glColor: lineColor,
10872				glBorderDash: borderDash,
10873				glBorderDashOffset: borderDashOffset,
10874				rotation: -1 * labelRotationRadians,
10875				label: label,
10876				major: tick.major,
10877				textOffset: textOffset,
10878				textAlign: textAlign
10879			});
10880		});
10881
10882		// Draw all of the tick labels, tick marks, and grid lines at the correct places
10883		helpers$1.each(itemsToDraw, function(itemToDraw) {
10884			var glWidth = itemToDraw.glWidth;
10885			var glColor = itemToDraw.glColor;
10886
10887			if (gridLines.display && glWidth && glColor) {
10888				context.save();
10889				context.lineWidth = glWidth;
10890				context.strokeStyle = glColor;
10891				if (context.setLineDash) {
10892					context.setLineDash(itemToDraw.glBorderDash);
10893					context.lineDashOffset = itemToDraw.glBorderDashOffset;
10894				}
10895
10896				context.beginPath();
10897
10898				if (gridLines.drawTicks) {
10899					context.moveTo(itemToDraw.tx1, itemToDraw.ty1);
10900					context.lineTo(itemToDraw.tx2, itemToDraw.ty2);
10901				}
10902
10903				if (gridLines.drawOnChartArea) {
10904					context.moveTo(itemToDraw.x1, itemToDraw.y1);
10905					context.lineTo(itemToDraw.x2, itemToDraw.y2);
10906				}
10907
10908				context.stroke();
10909				context.restore();
10910			}
10911
10912			if (optionTicks.display) {
10913				// Make sure we draw text in the correct color and font
10914				context.save();
10915				context.translate(itemToDraw.labelX, itemToDraw.labelY);
10916				context.rotate(itemToDraw.rotation);
10917				context.font = itemToDraw.major ? majorTickFont.string : tickFont.string;
10918				context.fillStyle = itemToDraw.major ? majorTickFontColor : tickFontColor;
10919				context.textBaseline = 'middle';
10920				context.textAlign = itemToDraw.textAlign;
10921
10922				var label = itemToDraw.label;
10923				var y = itemToDraw.textOffset;
10924				if (helpers$1.isArray(label)) {
10925					for (var i = 0; i < label.length; ++i) {
10926						// We just make sure the multiline element is a string here..
10927						context.fillText('' + label[i], 0, y);
10928						y += lineHeight;
10929					}
10930				} else {
10931					context.fillText(label, 0, y);
10932				}
10933				context.restore();
10934			}
10935		});
10936
10937		if (scaleLabel.display) {
10938			// Draw the scale label
10939			var scaleLabelX;
10940			var scaleLabelY;
10941			var rotation = 0;
10942			var halfLineHeight = scaleLabelFont.lineHeight / 2;
10943
10944			if (isHorizontal) {
10945				scaleLabelX = me.left + ((me.right - me.left) / 2); // midpoint of the width
10946				scaleLabelY = position === 'bottom'
10947					? me.bottom - halfLineHeight - scaleLabelPadding.bottom
10948					: me.top + halfLineHeight + scaleLabelPadding.top;
10949			} else {
10950				var isLeft = position === 'left';
10951				scaleLabelX = isLeft
10952					? me.left + halfLineHeight + scaleLabelPadding.top
10953					: me.right - halfLineHeight - scaleLabelPadding.top;
10954				scaleLabelY = me.top + ((me.bottom - me.top) / 2);
10955				rotation = isLeft ? -0.5 * Math.PI : 0.5 * Math.PI;
10956			}
10957
10958			context.save();
10959			context.translate(scaleLabelX, scaleLabelY);
10960			context.rotate(rotation);
10961			context.textAlign = 'center';
10962			context.textBaseline = 'middle';
10963			context.fillStyle = scaleLabelFontColor; // render in correct colour
10964			context.font = scaleLabelFont.string;
10965			context.fillText(scaleLabel.labelString, 0, 0);
10966			context.restore();
10967		}
10968
10969		if (axisWidth) {
10970			// Draw the line at the edge of the axis
10971			var firstLineWidth = axisWidth;
10972			var lastLineWidth = valueAtIndexOrDefault(gridLines.lineWidth, ticks.length - 1, 0);
10973			var x1, x2, y1, y2;
10974
10975			if (isHorizontal) {
10976				x1 = alignPixel(chart, me.left, firstLineWidth) - firstLineWidth / 2;
10977				x2 = alignPixel(chart, me.right, lastLineWidth) + lastLineWidth / 2;
10978				y1 = y2 = borderValue;
10979			} else {
10980				y1 = alignPixel(chart, me.top, firstLineWidth) - firstLineWidth / 2;
10981				y2 = alignPixel(chart, me.bottom, lastLineWidth) + lastLineWidth / 2;
10982				x1 = x2 = borderValue;
10983			}
10984
10985			context.lineWidth = axisWidth;
10986			context.strokeStyle = valueAtIndexOrDefault(gridLines.color, 0);
10987			context.beginPath();
10988			context.moveTo(x1, y1);
10989			context.lineTo(x2, y2);
10990			context.stroke();
10991		}
10992	}
10993});
10994
10995var defaultConfig = {
10996	position: 'bottom'
10997};
10998
10999var scale_category = core_scale.extend({
11000	/**
11001	* Internal function to get the correct labels. If data.xLabels or data.yLabels are defined, use those
11002	* else fall back to data.labels
11003	* @private
11004	*/
11005	getLabels: function() {
11006		var data = this.chart.data;
11007		return this.options.labels || (this.isHorizontal() ? data.xLabels : data.yLabels) || data.labels;
11008	},
11009
11010	determineDataLimits: function() {
11011		var me = this;
11012		var labels = me.getLabels();
11013		me.minIndex = 0;
11014		me.maxIndex = labels.length - 1;
11015		var findIndex;
11016
11017		if (me.options.ticks.min !== undefined) {
11018			// user specified min value
11019			findIndex = labels.indexOf(me.options.ticks.min);
11020			me.minIndex = findIndex !== -1 ? findIndex : me.minIndex;
11021		}
11022
11023		if (me.options.ticks.max !== undefined) {
11024			// user specified max value
11025			findIndex = labels.indexOf(me.options.ticks.max);
11026			me.maxIndex = findIndex !== -1 ? findIndex : me.maxIndex;
11027		}
11028
11029		me.min = labels[me.minIndex];
11030		me.max = labels[me.maxIndex];
11031	},
11032
11033	buildTicks: function() {
11034		var me = this;
11035		var labels = me.getLabels();
11036		// If we are viewing some subset of labels, slice the original array
11037		me.ticks = (me.minIndex === 0 && me.maxIndex === labels.length - 1) ? labels : labels.slice(me.minIndex, me.maxIndex + 1);
11038	},
11039
11040	getLabelForIndex: function(index, datasetIndex) {
11041		var me = this;
11042		var data = me.chart.data;
11043		var isHorizontal = me.isHorizontal();
11044
11045		if (data.yLabels && !isHorizontal) {
11046			return me.getRightValue(data.datasets[datasetIndex].data[index]);
11047		}
11048		return me.ticks[index - me.minIndex];
11049	},
11050
11051	// Used to get data value locations.  Value can either be an index or a numerical value
11052	getPixelForValue: function(value, index) {
11053		var me = this;
11054		var offset = me.options.offset;
11055		// 1 is added because we need the length but we have the indexes
11056		var offsetAmt = Math.max((me.maxIndex + 1 - me.minIndex - (offset ? 0 : 1)), 1);
11057
11058		// If value is a data object, then index is the index in the data array,
11059		// not the index of the scale. We need to change that.
11060		var valueCategory;
11061		if (value !== undefined && value !== null) {
11062			valueCategory = me.isHorizontal() ? value.x : value.y;
11063		}
11064		if (valueCategory !== undefined || (value !== undefined && isNaN(index))) {
11065			var labels = me.getLabels();
11066			value = valueCategory || value;
11067			var idx = labels.indexOf(value);
11068			index = idx !== -1 ? idx : index;
11069		}
11070
11071		if (me.isHorizontal()) {
11072			var valueWidth = me.width / offsetAmt;
11073			var widthOffset = (valueWidth * (index - me.minIndex));
11074
11075			if (offset) {
11076				widthOffset += (valueWidth / 2);
11077			}
11078
11079			return me.left + widthOffset;
11080		}
11081		var valueHeight = me.height / offsetAmt;
11082		var heightOffset = (valueHeight * (index - me.minIndex));
11083
11084		if (offset) {
11085			heightOffset += (valueHeight / 2);
11086		}
11087
11088		return me.top + heightOffset;
11089	},
11090
11091	getPixelForTick: function(index) {
11092		return this.getPixelForValue(this.ticks[index], index + this.minIndex, null);
11093	},
11094
11095	getValueForPixel: function(pixel) {
11096		var me = this;
11097		var offset = me.options.offset;
11098		var value;
11099		var offsetAmt = Math.max((me._ticks.length - (offset ? 0 : 1)), 1);
11100		var horz = me.isHorizontal();
11101		var valueDimension = (horz ? me.width : me.height) / offsetAmt;
11102
11103		pixel -= horz ? me.left : me.top;
11104
11105		if (offset) {
11106			pixel -= (valueDimension / 2);
11107		}
11108
11109		if (pixel <= 0) {
11110			value = 0;
11111		} else {
11112			value = Math.round(pixel / valueDimension);
11113		}
11114
11115		return value + me.minIndex;
11116	},
11117
11118	getBasePixel: function() {
11119		return this.bottom;
11120	}
11121});
11122
11123// INTERNAL: static default options, registered in src/chart.js
11124var _defaults = defaultConfig;
11125scale_category._defaults = _defaults;
11126
11127var noop = helpers$1.noop;
11128var isNullOrUndef = helpers$1.isNullOrUndef;
11129
11130/**
11131 * Generate a set of linear ticks
11132 * @param generationOptions the options used to generate the ticks
11133 * @param dataRange the range of the data
11134 * @returns {Array<Number>} array of tick values
11135 */
11136function generateTicks(generationOptions, dataRange) {
11137	var ticks = [];
11138	// To get a "nice" value for the tick spacing, we will use the appropriately named
11139	// "nice number" algorithm. See https://stackoverflow.com/questions/8506881/nice-label-algorithm-for-charts-with-minimum-ticks
11140	// for details.
11141
11142	var MIN_SPACING = 1e-14;
11143	var stepSize = generationOptions.stepSize;
11144	var unit = stepSize || 1;
11145	var maxNumSpaces = generationOptions.maxTicks - 1;
11146	var min = generationOptions.min;
11147	var max = generationOptions.max;
11148	var precision = generationOptions.precision;
11149	var rmin = dataRange.min;
11150	var rmax = dataRange.max;
11151	var spacing = helpers$1.niceNum((rmax - rmin) / maxNumSpaces / unit) * unit;
11152	var factor, niceMin, niceMax, numSpaces;
11153
11154	// Beyond MIN_SPACING floating point numbers being to lose precision
11155	// such that we can't do the math necessary to generate ticks
11156	if (spacing < MIN_SPACING && isNullOrUndef(min) && isNullOrUndef(max)) {
11157		return [rmin, rmax];
11158	}
11159
11160	numSpaces = Math.ceil(rmax / spacing) - Math.floor(rmin / spacing);
11161	if (numSpaces > maxNumSpaces) {
11162		// If the calculated num of spaces exceeds maxNumSpaces, recalculate it
11163		spacing = helpers$1.niceNum(numSpaces * spacing / maxNumSpaces / unit) * unit;
11164	}
11165
11166	if (stepSize || isNullOrUndef(precision)) {
11167		// If a precision is not specified, calculate factor based on spacing
11168		factor = Math.pow(10, helpers$1.decimalPlaces(spacing));
11169	} else {
11170		// If the user specified a precision, round to that number of decimal places
11171		factor = Math.pow(10, precision);
11172		spacing = Math.ceil(spacing * factor) / factor;
11173	}
11174
11175	niceMin = Math.floor(rmin / spacing) * spacing;
11176	niceMax = Math.ceil(rmax / spacing) * spacing;
11177
11178	// If min, max and stepSize is set and they make an evenly spaced scale use it.
11179	if (stepSize) {
11180		// If very close to our whole number, use it.
11181		if (!isNullOrUndef(min) && helpers$1.almostWhole(min / spacing, spacing / 1000)) {
11182			niceMin = min;
11183		}
11184		if (!isNullOrUndef(max) && helpers$1.almostWhole(max / spacing, spacing / 1000)) {
11185			niceMax = max;
11186		}
11187	}
11188
11189	numSpaces = (niceMax - niceMin) / spacing;
11190	// If very close to our rounded value, use it.
11191	if (helpers$1.almostEquals(numSpaces, Math.round(numSpaces), spacing / 1000)) {
11192		numSpaces = Math.round(numSpaces);
11193	} else {
11194		numSpaces = Math.ceil(numSpaces);
11195	}
11196
11197	niceMin = Math.round(niceMin * factor) / factor;
11198	niceMax = Math.round(niceMax * factor) / factor;
11199	ticks.push(isNullOrUndef(min) ? niceMin : min);
11200	for (var j = 1; j < numSpaces; ++j) {
11201		ticks.push(Math.round((niceMin + j * spacing) * factor) / factor);
11202	}
11203	ticks.push(isNullOrUndef(max) ? niceMax : max);
11204
11205	return ticks;
11206}
11207
11208var scale_linearbase = core_scale.extend({
11209	getRightValue: function(value) {
11210		if (typeof value === 'string') {
11211			return +value;
11212		}
11213		return core_scale.prototype.getRightValue.call(this, value);
11214	},
11215
11216	handleTickRangeOptions: function() {
11217		var me = this;
11218		var opts = me.options;
11219		var tickOpts = opts.ticks;
11220
11221		// If we are forcing it to begin at 0, but 0 will already be rendered on the chart,
11222		// do nothing since that would make the chart weird. If the user really wants a weird chart
11223		// axis, they can manually override it
11224		if (tickOpts.beginAtZero) {
11225			var minSign = helpers$1.sign(me.min);
11226			var maxSign = helpers$1.sign(me.max);
11227
11228			if (minSign < 0 && maxSign < 0) {
11229				// move the top up to 0
11230				me.max = 0;
11231			} else if (minSign > 0 && maxSign > 0) {
11232				// move the bottom down to 0
11233				me.min = 0;
11234			}
11235		}
11236
11237		var setMin = tickOpts.min !== undefined || tickOpts.suggestedMin !== undefined;
11238		var setMax = tickOpts.max !== undefined || tickOpts.suggestedMax !== undefined;
11239
11240		if (tickOpts.min !== undefined) {
11241			me.min = tickOpts.min;
11242		} else if (tickOpts.suggestedMin !== undefined) {
11243			if (me.min === null) {
11244				me.min = tickOpts.suggestedMin;
11245			} else {
11246				me.min = Math.min(me.min, tickOpts.suggestedMin);
11247			}
11248		}
11249
11250		if (tickOpts.max !== undefined) {
11251			me.max = tickOpts.max;
11252		} else if (tickOpts.suggestedMax !== undefined) {
11253			if (me.max === null) {
11254				me.max = tickOpts.suggestedMax;
11255			} else {
11256				me.max = Math.max(me.max, tickOpts.suggestedMax);
11257			}
11258		}
11259
11260		if (setMin !== setMax) {
11261			// We set the min or the max but not both.
11262			// So ensure that our range is good
11263			// Inverted or 0 length range can happen when
11264			// ticks.min is set, and no datasets are visible
11265			if (me.min >= me.max) {
11266				if (setMin) {
11267					me.max = me.min + 1;
11268				} else {
11269					me.min = me.max - 1;
11270				}
11271			}
11272		}
11273
11274		if (me.min === me.max) {
11275			me.max++;
11276
11277			if (!tickOpts.beginAtZero) {
11278				me.min--;
11279			}
11280		}
11281	},
11282
11283	getTickLimit: function() {
11284		var me = this;
11285		var tickOpts = me.options.ticks;
11286		var stepSize = tickOpts.stepSize;
11287		var maxTicksLimit = tickOpts.maxTicksLimit;
11288		var maxTicks;
11289
11290		if (stepSize) {
11291			maxTicks = Math.ceil(me.max / stepSize) - Math.floor(me.min / stepSize) + 1;
11292		} else {
11293			maxTicks = me._computeTickLimit();
11294			maxTicksLimit = maxTicksLimit || 11;
11295		}
11296
11297		if (maxTicksLimit) {
11298			maxTicks = Math.min(maxTicksLimit, maxTicks);
11299		}
11300
11301		return maxTicks;
11302	},
11303
11304	_computeTickLimit: function() {
11305		return Number.POSITIVE_INFINITY;
11306	},
11307
11308	handleDirectionalChanges: noop,
11309
11310	buildTicks: function() {
11311		var me = this;
11312		var opts = me.options;
11313		var tickOpts = opts.ticks;
11314
11315		// Figure out what the max number of ticks we can support it is based on the size of
11316		// the axis area. For now, we say that the minimum tick spacing in pixels must be 40
11317		// We also limit the maximum number of ticks to 11 which gives a nice 10 squares on
11318		// the graph. Make sure we always have at least 2 ticks
11319		var maxTicks = me.getTickLimit();
11320		maxTicks = Math.max(2, maxTicks);
11321
11322		var numericGeneratorOptions = {
11323			maxTicks: maxTicks,
11324			min: tickOpts.min,
11325			max: tickOpts.max,
11326			precision: tickOpts.precision,
11327			stepSize: helpers$1.valueOrDefault(tickOpts.fixedStepSize, tickOpts.stepSize)
11328		};
11329		var ticks = me.ticks = generateTicks(numericGeneratorOptions, me);
11330
11331		me.handleDirectionalChanges();
11332
11333		// At this point, we need to update our max and min given the tick values since we have expanded the
11334		// range of the scale
11335		me.max = helpers$1.max(ticks);
11336		me.min = helpers$1.min(ticks);
11337
11338		if (tickOpts.reverse) {
11339			ticks.reverse();
11340
11341			me.start = me.max;
11342			me.end = me.min;
11343		} else {
11344			me.start = me.min;
11345			me.end = me.max;
11346		}
11347	},
11348
11349	convertTicksToLabels: function() {
11350		var me = this;
11351		me.ticksAsNumbers = me.ticks.slice();
11352		me.zeroLineIndex = me.ticks.indexOf(0);
11353
11354		core_scale.prototype.convertTicksToLabels.call(me);
11355	}
11356});
11357
11358var defaultConfig$1 = {
11359	position: 'left',
11360	ticks: {
11361		callback: core_ticks.formatters.linear
11362	}
11363};
11364
11365var scale_linear = scale_linearbase.extend({
11366	determineDataLimits: function() {
11367		var me = this;
11368		var opts = me.options;
11369		var chart = me.chart;
11370		var data = chart.data;
11371		var datasets = data.datasets;
11372		var isHorizontal = me.isHorizontal();
11373		var DEFAULT_MIN = 0;
11374		var DEFAULT_MAX = 1;
11375
11376		function IDMatches(meta) {
11377			return isHorizontal ? meta.xAxisID === me.id : meta.yAxisID === me.id;
11378		}
11379
11380		// First Calculate the range
11381		me.min = null;
11382		me.max = null;
11383
11384		var hasStacks = opts.stacked;
11385		if (hasStacks === undefined) {
11386			helpers$1.each(datasets, function(dataset, datasetIndex) {
11387				if (hasStacks) {
11388					return;
11389				}
11390
11391				var meta = chart.getDatasetMeta(datasetIndex);
11392				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta) &&
11393					meta.stack !== undefined) {
11394					hasStacks = true;
11395				}
11396			});
11397		}
11398
11399		if (opts.stacked || hasStacks) {
11400			var valuesPerStack = {};
11401
11402			helpers$1.each(datasets, function(dataset, datasetIndex) {
11403				var meta = chart.getDatasetMeta(datasetIndex);
11404				var key = [
11405					meta.type,
11406					// we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
11407					((opts.stacked === undefined && meta.stack === undefined) ? datasetIndex : ''),
11408					meta.stack
11409				].join('.');
11410
11411				if (valuesPerStack[key] === undefined) {
11412					valuesPerStack[key] = {
11413						positiveValues: [],
11414						negativeValues: []
11415					};
11416				}
11417
11418				// Store these per type
11419				var positiveValues = valuesPerStack[key].positiveValues;
11420				var negativeValues = valuesPerStack[key].negativeValues;
11421
11422				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
11423					helpers$1.each(dataset.data, function(rawValue, index) {
11424						var value = +me.getRightValue(rawValue);
11425						if (isNaN(value) || meta.data[index].hidden) {
11426							return;
11427						}
11428
11429						positiveValues[index] = positiveValues[index] || 0;
11430						negativeValues[index] = negativeValues[index] || 0;
11431
11432						if (opts.relativePoints) {
11433							positiveValues[index] = 100;
11434						} else if (value < 0) {
11435							negativeValues[index] += value;
11436						} else {
11437							positiveValues[index] += value;
11438						}
11439					});
11440				}
11441			});
11442
11443			helpers$1.each(valuesPerStack, function(valuesForType) {
11444				var values = valuesForType.positiveValues.concat(valuesForType.negativeValues);
11445				var minVal = helpers$1.min(values);
11446				var maxVal = helpers$1.max(values);
11447				me.min = me.min === null ? minVal : Math.min(me.min, minVal);
11448				me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
11449			});
11450
11451		} else {
11452			helpers$1.each(datasets, function(dataset, datasetIndex) {
11453				var meta = chart.getDatasetMeta(datasetIndex);
11454				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
11455					helpers$1.each(dataset.data, function(rawValue, index) {
11456						var value = +me.getRightValue(rawValue);
11457						if (isNaN(value) || meta.data[index].hidden) {
11458							return;
11459						}
11460
11461						if (me.min === null) {
11462							me.min = value;
11463						} else if (value < me.min) {
11464							me.min = value;
11465						}
11466
11467						if (me.max === null) {
11468							me.max = value;
11469						} else if (value > me.max) {
11470							me.max = value;
11471						}
11472					});
11473				}
11474			});
11475		}
11476
11477		me.min = isFinite(me.min) && !isNaN(me.min) ? me.min : DEFAULT_MIN;
11478		me.max = isFinite(me.max) && !isNaN(me.max) ? me.max : DEFAULT_MAX;
11479
11480		// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
11481		this.handleTickRangeOptions();
11482	},
11483
11484	// Returns the maximum number of ticks based on the scale dimension
11485	_computeTickLimit: function() {
11486		var me = this;
11487		var tickFont;
11488
11489		if (me.isHorizontal()) {
11490			return Math.ceil(me.width / 40);
11491		}
11492		tickFont = helpers$1.options._parseFont(me.options.ticks);
11493		return Math.ceil(me.height / tickFont.lineHeight);
11494	},
11495
11496	// Called after the ticks are built. We need
11497	handleDirectionalChanges: function() {
11498		if (!this.isHorizontal()) {
11499			// We are in a vertical orientation. The top value is the highest. So reverse the array
11500			this.ticks.reverse();
11501		}
11502	},
11503
11504	getLabelForIndex: function(index, datasetIndex) {
11505		return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
11506	},
11507
11508	// Utils
11509	getPixelForValue: function(value) {
11510		// This must be called after fit has been run so that
11511		// this.left, this.top, this.right, and this.bottom have been defined
11512		var me = this;
11513		var start = me.start;
11514
11515		var rightValue = +me.getRightValue(value);
11516		var pixel;
11517		var range = me.end - start;
11518
11519		if (me.isHorizontal()) {
11520			pixel = me.left + (me.width / range * (rightValue - start));
11521		} else {
11522			pixel = me.bottom - (me.height / range * (rightValue - start));
11523		}
11524		return pixel;
11525	},
11526
11527	getValueForPixel: function(pixel) {
11528		var me = this;
11529		var isHorizontal = me.isHorizontal();
11530		var innerDimension = isHorizontal ? me.width : me.height;
11531		var offset = (isHorizontal ? pixel - me.left : me.bottom - pixel) / innerDimension;
11532		return me.start + ((me.end - me.start) * offset);
11533	},
11534
11535	getPixelForTick: function(index) {
11536		return this.getPixelForValue(this.ticksAsNumbers[index]);
11537	}
11538});
11539
11540// INTERNAL: static default options, registered in src/chart.js
11541var _defaults$1 = defaultConfig$1;
11542scale_linear._defaults = _defaults$1;
11543
11544var valueOrDefault$8 = helpers$1.valueOrDefault;
11545
11546/**
11547 * Generate a set of logarithmic ticks
11548 * @param generationOptions the options used to generate the ticks
11549 * @param dataRange the range of the data
11550 * @returns {Array<Number>} array of tick values
11551 */
11552function generateTicks$1(generationOptions, dataRange) {
11553	var ticks = [];
11554
11555	var tickVal = valueOrDefault$8(generationOptions.min, Math.pow(10, Math.floor(helpers$1.log10(dataRange.min))));
11556
11557	var endExp = Math.floor(helpers$1.log10(dataRange.max));
11558	var endSignificand = Math.ceil(dataRange.max / Math.pow(10, endExp));
11559	var exp, significand;
11560
11561	if (tickVal === 0) {
11562		exp = Math.floor(helpers$1.log10(dataRange.minNotZero));
11563		significand = Math.floor(dataRange.minNotZero / Math.pow(10, exp));
11564
11565		ticks.push(tickVal);
11566		tickVal = significand * Math.pow(10, exp);
11567	} else {
11568		exp = Math.floor(helpers$1.log10(tickVal));
11569		significand = Math.floor(tickVal / Math.pow(10, exp));
11570	}
11571	var precision = exp < 0 ? Math.pow(10, Math.abs(exp)) : 1;
11572
11573	do {
11574		ticks.push(tickVal);
11575
11576		++significand;
11577		if (significand === 10) {
11578			significand = 1;
11579			++exp;
11580			precision = exp >= 0 ? 1 : precision;
11581		}
11582
11583		tickVal = Math.round(significand * Math.pow(10, exp) * precision) / precision;
11584	} while (exp < endExp || (exp === endExp && significand < endSignificand));
11585
11586	var lastTick = valueOrDefault$8(generationOptions.max, tickVal);
11587	ticks.push(lastTick);
11588
11589	return ticks;
11590}
11591
11592var defaultConfig$2 = {
11593	position: 'left',
11594
11595	// label settings
11596	ticks: {
11597		callback: core_ticks.formatters.logarithmic
11598	}
11599};
11600
11601var scale_logarithmic = core_scale.extend({
11602	determineDataLimits: function() {
11603		var me = this;
11604		var opts = me.options;
11605		var chart = me.chart;
11606		var data = chart.data;
11607		var datasets = data.datasets;
11608		var isHorizontal = me.isHorizontal();
11609		function IDMatches(meta) {
11610			return isHorizontal ? meta.xAxisID === me.id : meta.yAxisID === me.id;
11611		}
11612
11613		// Calculate Range
11614		me.min = null;
11615		me.max = null;
11616		me.minNotZero = null;
11617
11618		var hasStacks = opts.stacked;
11619		if (hasStacks === undefined) {
11620			helpers$1.each(datasets, function(dataset, datasetIndex) {
11621				if (hasStacks) {
11622					return;
11623				}
11624
11625				var meta = chart.getDatasetMeta(datasetIndex);
11626				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta) &&
11627					meta.stack !== undefined) {
11628					hasStacks = true;
11629				}
11630			});
11631		}
11632
11633		if (opts.stacked || hasStacks) {
11634			var valuesPerStack = {};
11635
11636			helpers$1.each(datasets, function(dataset, datasetIndex) {
11637				var meta = chart.getDatasetMeta(datasetIndex);
11638				var key = [
11639					meta.type,
11640					// we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
11641					((opts.stacked === undefined && meta.stack === undefined) ? datasetIndex : ''),
11642					meta.stack
11643				].join('.');
11644
11645				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
11646					if (valuesPerStack[key] === undefined) {
11647						valuesPerStack[key] = [];
11648					}
11649
11650					helpers$1.each(dataset.data, function(rawValue, index) {
11651						var values = valuesPerStack[key];
11652						var value = +me.getRightValue(rawValue);
11653						// invalid, hidden and negative values are ignored
11654						if (isNaN(value) || meta.data[index].hidden || value < 0) {
11655							return;
11656						}
11657						values[index] = values[index] || 0;
11658						values[index] += value;
11659					});
11660				}
11661			});
11662
11663			helpers$1.each(valuesPerStack, function(valuesForType) {
11664				if (valuesForType.length > 0) {
11665					var minVal = helpers$1.min(valuesForType);
11666					var maxVal = helpers$1.max(valuesForType);
11667					me.min = me.min === null ? minVal : Math.min(me.min, minVal);
11668					me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
11669				}
11670			});
11671
11672		} else {
11673			helpers$1.each(datasets, function(dataset, datasetIndex) {
11674				var meta = chart.getDatasetMeta(datasetIndex);
11675				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
11676					helpers$1.each(dataset.data, function(rawValue, index) {
11677						var value = +me.getRightValue(rawValue);
11678						// invalid, hidden and negative values are ignored
11679						if (isNaN(value) || meta.data[index].hidden || value < 0) {
11680							return;
11681						}
11682
11683						if (me.min === null) {
11684							me.min = value;
11685						} else if (value < me.min) {
11686							me.min = value;
11687						}
11688
11689						if (me.max === null) {
11690							me.max = value;
11691						} else if (value > me.max) {
11692							me.max = value;
11693						}
11694
11695						if (value !== 0 && (me.minNotZero === null || value < me.minNotZero)) {
11696							me.minNotZero = value;
11697						}
11698					});
11699				}
11700			});
11701		}
11702
11703		// Common base implementation to handle ticks.min, ticks.max
11704		this.handleTickRangeOptions();
11705	},
11706
11707	handleTickRangeOptions: function() {
11708		var me = this;
11709		var tickOpts = me.options.ticks;
11710		var DEFAULT_MIN = 1;
11711		var DEFAULT_MAX = 10;
11712
11713		me.min = valueOrDefault$8(tickOpts.min, me.min);
11714		me.max = valueOrDefault$8(tickOpts.max, me.max);
11715
11716		if (me.min === me.max) {
11717			if (me.min !== 0 && me.min !== null) {
11718				me.min = Math.pow(10, Math.floor(helpers$1.log10(me.min)) - 1);
11719				me.max = Math.pow(10, Math.floor(helpers$1.log10(me.max)) + 1);
11720			} else {
11721				me.min = DEFAULT_MIN;
11722				me.max = DEFAULT_MAX;
11723			}
11724		}
11725		if (me.min === null) {
11726			me.min = Math.pow(10, Math.floor(helpers$1.log10(me.max)) - 1);
11727		}
11728		if (me.max === null) {
11729			me.max = me.min !== 0
11730				? Math.pow(10, Math.floor(helpers$1.log10(me.min)) + 1)
11731				: DEFAULT_MAX;
11732		}
11733		if (me.minNotZero === null) {
11734			if (me.min > 0) {
11735				me.minNotZero = me.min;
11736			} else if (me.max < 1) {
11737				me.minNotZero = Math.pow(10, Math.floor(helpers$1.log10(me.max)));
11738			} else {
11739				me.minNotZero = DEFAULT_MIN;
11740			}
11741		}
11742	},
11743
11744	buildTicks: function() {
11745		var me = this;
11746		var tickOpts = me.options.ticks;
11747		var reverse = !me.isHorizontal();
11748
11749		var generationOptions = {
11750			min: tickOpts.min,
11751			max: tickOpts.max
11752		};
11753		var ticks = me.ticks = generateTicks$1(generationOptions, me);
11754
11755		// At this point, we need to update our max and min given the tick values since we have expanded the
11756		// range of the scale
11757		me.max = helpers$1.max(ticks);
11758		me.min = helpers$1.min(ticks);
11759
11760		if (tickOpts.reverse) {
11761			reverse = !reverse;
11762			me.start = me.max;
11763			me.end = me.min;
11764		} else {
11765			me.start = me.min;
11766			me.end = me.max;
11767		}
11768		if (reverse) {
11769			ticks.reverse();
11770		}
11771	},
11772
11773	convertTicksToLabels: function() {
11774		this.tickValues = this.ticks.slice();
11775
11776		core_scale.prototype.convertTicksToLabels.call(this);
11777	},
11778
11779	// Get the correct tooltip label
11780	getLabelForIndex: function(index, datasetIndex) {
11781		return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
11782	},
11783
11784	getPixelForTick: function(index) {
11785		return this.getPixelForValue(this.tickValues[index]);
11786	},
11787
11788	/**
11789	 * Returns the value of the first tick.
11790	 * @param {Number} value - The minimum not zero value.
11791	 * @return {Number} The first tick value.
11792	 * @private
11793	 */
11794	_getFirstTickValue: function(value) {
11795		var exp = Math.floor(helpers$1.log10(value));
11796		var significand = Math.floor(value / Math.pow(10, exp));
11797
11798		return significand * Math.pow(10, exp);
11799	},
11800
11801	getPixelForValue: function(value) {
11802		var me = this;
11803		var tickOpts = me.options.ticks;
11804		var reverse = tickOpts.reverse;
11805		var log10 = helpers$1.log10;
11806		var firstTickValue = me._getFirstTickValue(me.minNotZero);
11807		var offset = 0;
11808		var innerDimension, pixel, start, end, sign;
11809
11810		value = +me.getRightValue(value);
11811		if (reverse) {
11812			start = me.end;
11813			end = me.start;
11814			sign = -1;
11815		} else {
11816			start = me.start;
11817			end = me.end;
11818			sign = 1;
11819		}
11820		if (me.isHorizontal()) {
11821			innerDimension = me.width;
11822			pixel = reverse ? me.right : me.left;
11823		} else {
11824			innerDimension = me.height;
11825			sign *= -1; // invert, since the upper-left corner of the canvas is at pixel (0, 0)
11826			pixel = reverse ? me.top : me.bottom;
11827		}
11828		if (value !== start) {
11829			if (start === 0) { // include zero tick
11830				offset = valueOrDefault$8(tickOpts.fontSize, core_defaults.global.defaultFontSize);
11831				innerDimension -= offset;
11832				start = firstTickValue;
11833			}
11834			if (value !== 0) {
11835				offset += innerDimension / (log10(end) - log10(start)) * (log10(value) - log10(start));
11836			}
11837			pixel += sign * offset;
11838		}
11839		return pixel;
11840	},
11841
11842	getValueForPixel: function(pixel) {
11843		var me = this;
11844		var tickOpts = me.options.ticks;
11845		var reverse = tickOpts.reverse;
11846		var log10 = helpers$1.log10;
11847		var firstTickValue = me._getFirstTickValue(me.minNotZero);
11848		var innerDimension, start, end, value;
11849
11850		if (reverse) {
11851			start = me.end;
11852			end = me.start;
11853		} else {
11854			start = me.start;
11855			end = me.end;
11856		}
11857		if (me.isHorizontal()) {
11858			innerDimension = me.width;
11859			value = reverse ? me.right - pixel : pixel - me.left;
11860		} else {
11861			innerDimension = me.height;
11862			value = reverse ? pixel - me.top : me.bottom - pixel;
11863		}
11864		if (value !== start) {
11865			if (start === 0) { // include zero tick
11866				var offset = valueOrDefault$8(tickOpts.fontSize, core_defaults.global.defaultFontSize);
11867				value -= offset;
11868				innerDimension -= offset;
11869				start = firstTickValue;
11870			}
11871			value *= log10(end) - log10(start);
11872			value /= innerDimension;
11873			value = Math.pow(10, log10(start) + value);
11874		}
11875		return value;
11876	}
11877});
11878
11879// INTERNAL: static default options, registered in src/chart.js
11880var _defaults$2 = defaultConfig$2;
11881scale_logarithmic._defaults = _defaults$2;
11882
11883var valueOrDefault$9 = helpers$1.valueOrDefault;
11884var valueAtIndexOrDefault$1 = helpers$1.valueAtIndexOrDefault;
11885var resolve$7 = helpers$1.options.resolve;
11886
11887var defaultConfig$3 = {
11888	display: true,
11889
11890	// Boolean - Whether to animate scaling the chart from the centre
11891	animate: true,
11892	position: 'chartArea',
11893
11894	angleLines: {
11895		display: true,
11896		color: 'rgba(0, 0, 0, 0.1)',
11897		lineWidth: 1,
11898		borderDash: [],
11899		borderDashOffset: 0.0
11900	},
11901
11902	gridLines: {
11903		circular: false
11904	},
11905
11906	// label settings
11907	ticks: {
11908		// Boolean - Show a backdrop to the scale label
11909		showLabelBackdrop: true,
11910
11911		// String - The colour of the label backdrop
11912		backdropColor: 'rgba(255,255,255,0.75)',
11913
11914		// Number - The backdrop padding above & below the label in pixels
11915		backdropPaddingY: 2,
11916
11917		// Number - The backdrop padding to the side of the label in pixels
11918		backdropPaddingX: 2,
11919
11920		callback: core_ticks.formatters.linear
11921	},
11922
11923	pointLabels: {
11924		// Boolean - if true, show point labels
11925		display: true,
11926
11927		// Number - Point label font size in pixels
11928		fontSize: 10,
11929
11930		// Function - Used to convert point labels
11931		callback: function(label) {
11932			return label;
11933		}
11934	}
11935};
11936
11937function getValueCount(scale) {
11938	var opts = scale.options;
11939	return opts.angleLines.display || opts.pointLabels.display ? scale.chart.data.labels.length : 0;
11940}
11941
11942function getTickBackdropHeight(opts) {
11943	var tickOpts = opts.ticks;
11944
11945	if (tickOpts.display && opts.display) {
11946		return valueOrDefault$9(tickOpts.fontSize, core_defaults.global.defaultFontSize) + tickOpts.backdropPaddingY * 2;
11947	}
11948	return 0;
11949}
11950
11951function measureLabelSize(ctx, lineHeight, label) {
11952	if (helpers$1.isArray(label)) {
11953		return {
11954			w: helpers$1.longestText(ctx, ctx.font, label),
11955			h: label.length * lineHeight
11956		};
11957	}
11958
11959	return {
11960		w: ctx.measureText(label).width,
11961		h: lineHeight
11962	};
11963}
11964
11965function determineLimits(angle, pos, size, min, max) {
11966	if (angle === min || angle === max) {
11967		return {
11968			start: pos - (size / 2),
11969			end: pos + (size / 2)
11970		};
11971	} else if (angle < min || angle > max) {
11972		return {
11973			start: pos - size,
11974			end: pos
11975		};
11976	}
11977
11978	return {
11979		start: pos,
11980		end: pos + size
11981	};
11982}
11983
11984/**
11985 * Helper function to fit a radial linear scale with point labels
11986 */
11987function fitWithPointLabels(scale) {
11988
11989	// Right, this is really confusing and there is a lot of maths going on here
11990	// The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
11991	//
11992	// Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
11993	//
11994	// Solution:
11995	//
11996	// We assume the radius of the polygon is half the size of the canvas at first
11997	// at each index we check if the text overlaps.
11998	//
11999	// Where it does, we store that angle and that index.
12000	//
12001	// After finding the largest index and angle we calculate how much we need to remove
12002	// from the shape radius to move the point inwards by that x.
12003	//
12004	// We average the left and right distances to get the maximum shape radius that can fit in the box
12005	// along with labels.
12006	//
12007	// Once we have that, we can find the centre point for the chart, by taking the x text protrusion
12008	// on each side, removing that from the size, halving it and adding the left x protrusion width.
12009	//
12010	// This will mean we have a shape fitted to the canvas, as large as it can be with the labels
12011	// and position it in the most space efficient manner
12012	//
12013	// https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif
12014
12015	var plFont = helpers$1.options._parseFont(scale.options.pointLabels);
12016
12017	// Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
12018	// Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
12019	var furthestLimits = {
12020		l: 0,
12021		r: scale.width,
12022		t: 0,
12023		b: scale.height - scale.paddingTop
12024	};
12025	var furthestAngles = {};
12026	var i, textSize, pointPosition;
12027
12028	scale.ctx.font = plFont.string;
12029	scale._pointLabelSizes = [];
12030
12031	var valueCount = getValueCount(scale);
12032	for (i = 0; i < valueCount; i++) {
12033		pointPosition = scale.getPointPosition(i, scale.drawingArea + 5);
12034		textSize = measureLabelSize(scale.ctx, plFont.lineHeight, scale.pointLabels[i] || '');
12035		scale._pointLabelSizes[i] = textSize;
12036
12037		// Add quarter circle to make degree 0 mean top of circle
12038		var angleRadians = scale.getIndexAngle(i);
12039		var angle = helpers$1.toDegrees(angleRadians) % 360;
12040		var hLimits = determineLimits(angle, pointPosition.x, textSize.w, 0, 180);
12041		var vLimits = determineLimits(angle, pointPosition.y, textSize.h, 90, 270);
12042
12043		if (hLimits.start < furthestLimits.l) {
12044			furthestLimits.l = hLimits.start;
12045			furthestAngles.l = angleRadians;
12046		}
12047
12048		if (hLimits.end > furthestLimits.r) {
12049			furthestLimits.r = hLimits.end;
12050			furthestAngles.r = angleRadians;
12051		}
12052
12053		if (vLimits.start < furthestLimits.t) {
12054			furthestLimits.t = vLimits.start;
12055			furthestAngles.t = angleRadians;
12056		}
12057
12058		if (vLimits.end > furthestLimits.b) {
12059			furthestLimits.b = vLimits.end;
12060			furthestAngles.b = angleRadians;
12061		}
12062	}
12063
12064	scale.setReductions(scale.drawingArea, furthestLimits, furthestAngles);
12065}
12066
12067function getTextAlignForAngle(angle) {
12068	if (angle === 0 || angle === 180) {
12069		return 'center';
12070	} else if (angle < 180) {
12071		return 'left';
12072	}
12073
12074	return 'right';
12075}
12076
12077function fillText(ctx, text, position, lineHeight) {
12078	var y = position.y + lineHeight / 2;
12079	var i, ilen;
12080
12081	if (helpers$1.isArray(text)) {
12082		for (i = 0, ilen = text.length; i < ilen; ++i) {
12083			ctx.fillText(text[i], position.x, y);
12084			y += lineHeight;
12085		}
12086	} else {
12087		ctx.fillText(text, position.x, y);
12088	}
12089}
12090
12091function adjustPointPositionForLabelHeight(angle, textSize, position) {
12092	if (angle === 90 || angle === 270) {
12093		position.y -= (textSize.h / 2);
12094	} else if (angle > 270 || angle < 90) {
12095		position.y -= textSize.h;
12096	}
12097}
12098
12099function drawPointLabels(scale) {
12100	var ctx = scale.ctx;
12101	var opts = scale.options;
12102	var angleLineOpts = opts.angleLines;
12103	var gridLineOpts = opts.gridLines;
12104	var pointLabelOpts = opts.pointLabels;
12105	var lineWidth = valueOrDefault$9(angleLineOpts.lineWidth, gridLineOpts.lineWidth);
12106	var lineColor = valueOrDefault$9(angleLineOpts.color, gridLineOpts.color);
12107	var tickBackdropHeight = getTickBackdropHeight(opts);
12108
12109	ctx.save();
12110	ctx.lineWidth = lineWidth;
12111	ctx.strokeStyle = lineColor;
12112	if (ctx.setLineDash) {
12113		ctx.setLineDash(resolve$7([angleLineOpts.borderDash, gridLineOpts.borderDash, []]));
12114		ctx.lineDashOffset = resolve$7([angleLineOpts.borderDashOffset, gridLineOpts.borderDashOffset, 0.0]);
12115	}
12116
12117	var outerDistance = scale.getDistanceFromCenterForValue(opts.ticks.reverse ? scale.min : scale.max);
12118
12119	// Point Label Font
12120	var plFont = helpers$1.options._parseFont(pointLabelOpts);
12121
12122	ctx.font = plFont.string;
12123	ctx.textBaseline = 'middle';
12124
12125	for (var i = getValueCount(scale) - 1; i >= 0; i--) {
12126		if (angleLineOpts.display && lineWidth && lineColor) {
12127			var outerPosition = scale.getPointPosition(i, outerDistance);
12128			ctx.beginPath();
12129			ctx.moveTo(scale.xCenter, scale.yCenter);
12130			ctx.lineTo(outerPosition.x, outerPosition.y);
12131			ctx.stroke();
12132		}
12133
12134		if (pointLabelOpts.display) {
12135			// Extra pixels out for some label spacing
12136			var extra = (i === 0 ? tickBackdropHeight / 2 : 0);
12137			var pointLabelPosition = scale.getPointPosition(i, outerDistance + extra + 5);
12138
12139			// Keep this in loop since we may support array properties here
12140			var pointLabelFontColor = valueAtIndexOrDefault$1(pointLabelOpts.fontColor, i, core_defaults.global.defaultFontColor);
12141			ctx.fillStyle = pointLabelFontColor;
12142
12143			var angleRadians = scale.getIndexAngle(i);
12144			var angle = helpers$1.toDegrees(angleRadians);
12145			ctx.textAlign = getTextAlignForAngle(angle);
12146			adjustPointPositionForLabelHeight(angle, scale._pointLabelSizes[i], pointLabelPosition);
12147			fillText(ctx, scale.pointLabels[i] || '', pointLabelPosition, plFont.lineHeight);
12148		}
12149	}
12150	ctx.restore();
12151}
12152
12153function drawRadiusLine(scale, gridLineOpts, radius, index) {
12154	var ctx = scale.ctx;
12155	var circular = gridLineOpts.circular;
12156	var valueCount = getValueCount(scale);
12157	var lineColor = valueAtIndexOrDefault$1(gridLineOpts.color, index - 1);
12158	var lineWidth = valueAtIndexOrDefault$1(gridLineOpts.lineWidth, index - 1);
12159	var pointPosition;
12160
12161	if ((!circular && !valueCount) || !lineColor || !lineWidth) {
12162		return;
12163	}
12164
12165	ctx.save();
12166	ctx.strokeStyle = lineColor;
12167	ctx.lineWidth = lineWidth;
12168	if (ctx.setLineDash) {
12169		ctx.setLineDash(gridLineOpts.borderDash || []);
12170		ctx.lineDashOffset = gridLineOpts.borderDashOffset || 0.0;
12171	}
12172
12173	ctx.beginPath();
12174	if (circular) {
12175		// Draw circular arcs between the points
12176		ctx.arc(scale.xCenter, scale.yCenter, radius, 0, Math.PI * 2);
12177	} else {
12178		// Draw straight lines connecting each index
12179		pointPosition = scale.getPointPosition(0, radius);
12180		ctx.moveTo(pointPosition.x, pointPosition.y);
12181
12182		for (var i = 1; i < valueCount; i++) {
12183			pointPosition = scale.getPointPosition(i, radius);
12184			ctx.lineTo(pointPosition.x, pointPosition.y);
12185		}
12186	}
12187	ctx.closePath();
12188	ctx.stroke();
12189	ctx.restore();
12190}
12191
12192function numberOrZero(param) {
12193	return helpers$1.isNumber(param) ? param : 0;
12194}
12195
12196var scale_radialLinear = scale_linearbase.extend({
12197	setDimensions: function() {
12198		var me = this;
12199
12200		// Set the unconstrained dimension before label rotation
12201		me.width = me.maxWidth;
12202		me.height = me.maxHeight;
12203		me.paddingTop = getTickBackdropHeight(me.options) / 2;
12204		me.xCenter = Math.floor(me.width / 2);
12205		me.yCenter = Math.floor((me.height - me.paddingTop) / 2);
12206		me.drawingArea = Math.min(me.height - me.paddingTop, me.width) / 2;
12207	},
12208
12209	determineDataLimits: function() {
12210		var me = this;
12211		var chart = me.chart;
12212		var min = Number.POSITIVE_INFINITY;
12213		var max = Number.NEGATIVE_INFINITY;
12214
12215		helpers$1.each(chart.data.datasets, function(dataset, datasetIndex) {
12216			if (chart.isDatasetVisible(datasetIndex)) {
12217				var meta = chart.getDatasetMeta(datasetIndex);
12218
12219				helpers$1.each(dataset.data, function(rawValue, index) {
12220					var value = +me.getRightValue(rawValue);
12221					if (isNaN(value) || meta.data[index].hidden) {
12222						return;
12223					}
12224
12225					min = Math.min(value, min);
12226					max = Math.max(value, max);
12227				});
12228			}
12229		});
12230
12231		me.min = (min === Number.POSITIVE_INFINITY ? 0 : min);
12232		me.max = (max === Number.NEGATIVE_INFINITY ? 0 : max);
12233
12234		// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
12235		me.handleTickRangeOptions();
12236	},
12237
12238	// Returns the maximum number of ticks based on the scale dimension
12239	_computeTickLimit: function() {
12240		return Math.ceil(this.drawingArea / getTickBackdropHeight(this.options));
12241	},
12242
12243	convertTicksToLabels: function() {
12244		var me = this;
12245
12246		scale_linearbase.prototype.convertTicksToLabels.call(me);
12247
12248		// Point labels
12249		me.pointLabels = me.chart.data.labels.map(me.options.pointLabels.callback, me);
12250	},
12251
12252	getLabelForIndex: function(index, datasetIndex) {
12253		return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
12254	},
12255
12256	fit: function() {
12257		var me = this;
12258		var opts = me.options;
12259
12260		if (opts.display && opts.pointLabels.display) {
12261			fitWithPointLabels(me);
12262		} else {
12263			me.setCenterPoint(0, 0, 0, 0);
12264		}
12265	},
12266
12267	/**
12268	 * Set radius reductions and determine new radius and center point
12269	 * @private
12270	 */
12271	setReductions: function(largestPossibleRadius, furthestLimits, furthestAngles) {
12272		var me = this;
12273		var radiusReductionLeft = furthestLimits.l / Math.sin(furthestAngles.l);
12274		var radiusReductionRight = Math.max(furthestLimits.r - me.width, 0) / Math.sin(furthestAngles.r);
12275		var radiusReductionTop = -furthestLimits.t / Math.cos(furthestAngles.t);
12276		var radiusReductionBottom = -Math.max(furthestLimits.b - (me.height - me.paddingTop), 0) / Math.cos(furthestAngles.b);
12277
12278		radiusReductionLeft = numberOrZero(radiusReductionLeft);
12279		radiusReductionRight = numberOrZero(radiusReductionRight);
12280		radiusReductionTop = numberOrZero(radiusReductionTop);
12281		radiusReductionBottom = numberOrZero(radiusReductionBottom);
12282
12283		me.drawingArea = Math.min(
12284			Math.floor(largestPossibleRadius - (radiusReductionLeft + radiusReductionRight) / 2),
12285			Math.floor(largestPossibleRadius - (radiusReductionTop + radiusReductionBottom) / 2));
12286		me.setCenterPoint(radiusReductionLeft, radiusReductionRight, radiusReductionTop, radiusReductionBottom);
12287	},
12288
12289	setCenterPoint: function(leftMovement, rightMovement, topMovement, bottomMovement) {
12290		var me = this;
12291		var maxRight = me.width - rightMovement - me.drawingArea;
12292		var maxLeft = leftMovement + me.drawingArea;
12293		var maxTop = topMovement + me.drawingArea;
12294		var maxBottom = (me.height - me.paddingTop) - bottomMovement - me.drawingArea;
12295
12296		me.xCenter = Math.floor(((maxLeft + maxRight) / 2) + me.left);
12297		me.yCenter = Math.floor(((maxTop + maxBottom) / 2) + me.top + me.paddingTop);
12298	},
12299
12300	getIndexAngle: function(index) {
12301		var angleMultiplier = (Math.PI * 2) / getValueCount(this);
12302		var startAngle = this.chart.options && this.chart.options.startAngle ?
12303			this.chart.options.startAngle :
12304			0;
12305
12306		var startAngleRadians = startAngle * Math.PI * 2 / 360;
12307
12308		// Start from the top instead of right, so remove a quarter of the circle
12309		return index * angleMultiplier + startAngleRadians;
12310	},
12311
12312	getDistanceFromCenterForValue: function(value) {
12313		var me = this;
12314
12315		if (value === null) {
12316			return 0; // null always in center
12317		}
12318
12319		// Take into account half font size + the yPadding of the top value
12320		var scalingFactor = me.drawingArea / (me.max - me.min);
12321		if (me.options.ticks.reverse) {
12322			return (me.max - value) * scalingFactor;
12323		}
12324		return (value - me.min) * scalingFactor;
12325	},
12326
12327	getPointPosition: function(index, distanceFromCenter) {
12328		var me = this;
12329		var thisAngle = me.getIndexAngle(index) - (Math.PI / 2);
12330		return {
12331			x: Math.cos(thisAngle) * distanceFromCenter + me.xCenter,
12332			y: Math.sin(thisAngle) * distanceFromCenter + me.yCenter
12333		};
12334	},
12335
12336	getPointPositionForValue: function(index, value) {
12337		return this.getPointPosition(index, this.getDistanceFromCenterForValue(value));
12338	},
12339
12340	getBasePosition: function() {
12341		var me = this;
12342		var min = me.min;
12343		var max = me.max;
12344
12345		return me.getPointPositionForValue(0,
12346			me.beginAtZero ? 0 :
12347			min < 0 && max < 0 ? max :
12348			min > 0 && max > 0 ? min :
12349			0);
12350	},
12351
12352	draw: function() {
12353		var me = this;
12354		var opts = me.options;
12355		var gridLineOpts = opts.gridLines;
12356		var tickOpts = opts.ticks;
12357
12358		if (opts.display) {
12359			var ctx = me.ctx;
12360			var startAngle = this.getIndexAngle(0);
12361			var tickFont = helpers$1.options._parseFont(tickOpts);
12362
12363			if (opts.angleLines.display || opts.pointLabels.display) {
12364				drawPointLabels(me);
12365			}
12366
12367			helpers$1.each(me.ticks, function(label, index) {
12368				// Don't draw a centre value (if it is minimum)
12369				if (index > 0 || tickOpts.reverse) {
12370					var yCenterOffset = me.getDistanceFromCenterForValue(me.ticksAsNumbers[index]);
12371
12372					// Draw circular lines around the scale
12373					if (gridLineOpts.display && index !== 0) {
12374						drawRadiusLine(me, gridLineOpts, yCenterOffset, index);
12375					}
12376
12377					if (tickOpts.display) {
12378						var tickFontColor = valueOrDefault$9(tickOpts.fontColor, core_defaults.global.defaultFontColor);
12379						ctx.font = tickFont.string;
12380
12381						ctx.save();
12382						ctx.translate(me.xCenter, me.yCenter);
12383						ctx.rotate(startAngle);
12384
12385						if (tickOpts.showLabelBackdrop) {
12386							var labelWidth = ctx.measureText(label).width;
12387							ctx.fillStyle = tickOpts.backdropColor;
12388							ctx.fillRect(
12389								-labelWidth / 2 - tickOpts.backdropPaddingX,
12390								-yCenterOffset - tickFont.size / 2 - tickOpts.backdropPaddingY,
12391								labelWidth + tickOpts.backdropPaddingX * 2,
12392								tickFont.size + tickOpts.backdropPaddingY * 2
12393							);
12394						}
12395
12396						ctx.textAlign = 'center';
12397						ctx.textBaseline = 'middle';
12398						ctx.fillStyle = tickFontColor;
12399						ctx.fillText(label, 0, -yCenterOffset);
12400						ctx.restore();
12401					}
12402				}
12403			});
12404		}
12405	}
12406});
12407
12408// INTERNAL: static default options, registered in src/chart.js
12409var _defaults$3 = defaultConfig$3;
12410scale_radialLinear._defaults = _defaults$3;
12411
12412var adapter = core_adapters._date;
12413
12414
12415
12416
12417var valueOrDefault$a = helpers$1.valueOrDefault;
12418
12419// Integer constants are from the ES6 spec.
12420var MIN_INTEGER = Number.MIN_SAFE_INTEGER || -9007199254740991;
12421var MAX_INTEGER = Number.MAX_SAFE_INTEGER || 9007199254740991;
12422
12423var INTERVALS = {
12424	millisecond: {
12425		common: true,
12426		size: 1,
12427		steps: [1, 2, 5, 10, 20, 50, 100, 250, 500]
12428	},
12429	second: {
12430		common: true,
12431		size: 1000,
12432		steps: [1, 2, 5, 10, 15, 30]
12433	},
12434	minute: {
12435		common: true,
12436		size: 60000,
12437		steps: [1, 2, 5, 10, 15, 30]
12438	},
12439	hour: {
12440		common: true,
12441		size: 3600000,
12442		steps: [1, 2, 3, 6, 12]
12443	},
12444	day: {
12445		common: true,
12446		size: 86400000,
12447		steps: [1, 2, 5]
12448	},
12449	week: {
12450		common: false,
12451		size: 604800000,
12452		steps: [1, 2, 3, 4]
12453	},
12454	month: {
12455		common: true,
12456		size: 2.628e9,
12457		steps: [1, 2, 3]
12458	},
12459	quarter: {
12460		common: false,
12461		size: 7.884e9,
12462		steps: [1, 2, 3, 4]
12463	},
12464	year: {
12465		common: true,
12466		size: 3.154e10
12467	}
12468};
12469
12470var UNITS = Object.keys(INTERVALS);
12471
12472function sorter(a, b) {
12473	return a - b;
12474}
12475
12476function arrayUnique(items) {
12477	var hash = {};
12478	var out = [];
12479	var i, ilen, item;
12480
12481	for (i = 0, ilen = items.length; i < ilen; ++i) {
12482		item = items[i];
12483		if (!hash[item]) {
12484			hash[item] = true;
12485			out.push(item);
12486		}
12487	}
12488
12489	return out;
12490}
12491
12492/**
12493 * Returns an array of {time, pos} objects used to interpolate a specific `time` or position
12494 * (`pos`) on the scale, by searching entries before and after the requested value. `pos` is
12495 * a decimal between 0 and 1: 0 being the start of the scale (left or top) and 1 the other
12496 * extremity (left + width or top + height). Note that it would be more optimized to directly
12497 * store pre-computed pixels, but the scale dimensions are not guaranteed at the time we need
12498 * to create the lookup table. The table ALWAYS contains at least two items: min and max.
12499 *
12500 * @param {Number[]} timestamps - timestamps sorted from lowest to highest.
12501 * @param {String} distribution - If 'linear', timestamps will be spread linearly along the min
12502 * and max range, so basically, the table will contains only two items: {min, 0} and {max, 1}.
12503 * If 'series', timestamps will be positioned at the same distance from each other. In this
12504 * case, only timestamps that break the time linearity are registered, meaning that in the
12505 * best case, all timestamps are linear, the table contains only min and max.
12506 */
12507function buildLookupTable(timestamps, min, max, distribution) {
12508	if (distribution === 'linear' || !timestamps.length) {
12509		return [
12510			{time: min, pos: 0},
12511			{time: max, pos: 1}
12512		];
12513	}
12514
12515	var table = [];
12516	var items = [min];
12517	var i, ilen, prev, curr, next;
12518
12519	for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
12520		curr = timestamps[i];
12521		if (curr > min && curr < max) {
12522			items.push(curr);
12523		}
12524	}
12525
12526	items.push(max);
12527
12528	for (i = 0, ilen = items.length; i < ilen; ++i) {
12529		next = items[i + 1];
12530		prev = items[i - 1];
12531		curr = items[i];
12532
12533		// only add points that breaks the scale linearity
12534		if (prev === undefined || next === undefined || Math.round((next + prev) / 2) !== curr) {
12535			table.push({time: curr, pos: i / (ilen - 1)});
12536		}
12537	}
12538
12539	return table;
12540}
12541
12542// @see adapted from https://www.anujgakhar.com/2014/03/01/binary-search-in-javascript/
12543function lookup(table, key, value) {
12544	var lo = 0;
12545	var hi = table.length - 1;
12546	var mid, i0, i1;
12547
12548	while (lo >= 0 && lo <= hi) {
12549		mid = (lo + hi) >> 1;
12550		i0 = table[mid - 1] || null;
12551		i1 = table[mid];
12552
12553		if (!i0) {
12554			// given value is outside table (before first item)
12555			return {lo: null, hi: i1};
12556		} else if (i1[key] < value) {
12557			lo = mid + 1;
12558		} else if (i0[key] > value) {
12559			hi = mid - 1;
12560		} else {
12561			return {lo: i0, hi: i1};
12562		}
12563	}
12564
12565	// given value is outside table (after last item)
12566	return {lo: i1, hi: null};
12567}
12568
12569/**
12570 * Linearly interpolates the given source `value` using the table items `skey` values and
12571 * returns the associated `tkey` value. For example, interpolate(table, 'time', 42, 'pos')
12572 * returns the position for a timestamp equal to 42. If value is out of bounds, values at
12573 * index [0, 1] or [n - 1, n] are used for the interpolation.
12574 */
12575function interpolate$1(table, skey, sval, tkey) {
12576	var range = lookup(table, skey, sval);
12577
12578	// Note: the lookup table ALWAYS contains at least 2 items (min and max)
12579	var prev = !range.lo ? table[0] : !range.hi ? table[table.length - 2] : range.lo;
12580	var next = !range.lo ? table[1] : !range.hi ? table[table.length - 1] : range.hi;
12581
12582	var span = next[skey] - prev[skey];
12583	var ratio = span ? (sval - prev[skey]) / span : 0;
12584	var offset = (next[tkey] - prev[tkey]) * ratio;
12585
12586	return prev[tkey] + offset;
12587}
12588
12589function toTimestamp(input, options) {
12590	var parser = options.parser;
12591	var format = parser || options.format;
12592	var value = input;
12593
12594	if (typeof parser === 'function') {
12595		value = parser(value);
12596	}
12597
12598	// Only parse if its not a timestamp already
12599	if (!helpers$1.isFinite(value)) {
12600		value = typeof format === 'string'
12601			? adapter.parse(value, format)
12602			: adapter.parse(value);
12603	}
12604
12605	if (value !== null) {
12606		return +value;
12607	}
12608
12609	// Labels are in an incompatible format and no `parser` has been provided.
12610	// The user might still use the deprecated `format` option for parsing.
12611	if (!parser && typeof format === 'function') {
12612		value = format(input);
12613
12614		// `format` could return something else than a timestamp, if so, parse it
12615		if (!helpers$1.isFinite(value)) {
12616			value = adapter.parse(value);
12617		}
12618	}
12619
12620	return value;
12621}
12622
12623function parse(input, scale) {
12624	if (helpers$1.isNullOrUndef(input)) {
12625		return null;
12626	}
12627
12628	var options = scale.options.time;
12629	var value = toTimestamp(scale.getRightValue(input), options);
12630	if (value === null) {
12631		return value;
12632	}
12633
12634	if (options.round) {
12635		value = +adapter.startOf(value, options.round);
12636	}
12637
12638	return value;
12639}
12640
12641/**
12642 * Returns the number of unit to skip to be able to display up to `capacity` number of ticks
12643 * in `unit` for the given `min` / `max` range and respecting the interval steps constraints.
12644 */
12645function determineStepSize(min, max, unit, capacity) {
12646	var range = max - min;
12647	var interval = INTERVALS[unit];
12648	var milliseconds = interval.size;
12649	var steps = interval.steps;
12650	var i, ilen, factor;
12651
12652	if (!steps) {
12653		return Math.ceil(range / (capacity * milliseconds));
12654	}
12655
12656	for (i = 0, ilen = steps.length; i < ilen; ++i) {
12657		factor = steps[i];
12658		if (Math.ceil(range / (milliseconds * factor)) <= capacity) {
12659			break;
12660		}
12661	}
12662
12663	return factor;
12664}
12665
12666/**
12667 * Figures out what unit results in an appropriate number of auto-generated ticks
12668 */
12669function determineUnitForAutoTicks(minUnit, min, max, capacity) {
12670	var ilen = UNITS.length;
12671	var i, interval, factor;
12672
12673	for (i = UNITS.indexOf(minUnit); i < ilen - 1; ++i) {
12674		interval = INTERVALS[UNITS[i]];
12675		factor = interval.steps ? interval.steps[interval.steps.length - 1] : MAX_INTEGER;
12676
12677		if (interval.common && Math.ceil((max - min) / (factor * interval.size)) <= capacity) {
12678			return UNITS[i];
12679		}
12680	}
12681
12682	return UNITS[ilen - 1];
12683}
12684
12685/**
12686 * Figures out what unit to format a set of ticks with
12687 */
12688function determineUnitForFormatting(ticks, minUnit, min, max) {
12689	var ilen = UNITS.length;
12690	var i, unit;
12691
12692	for (i = ilen - 1; i >= UNITS.indexOf(minUnit); i--) {
12693		unit = UNITS[i];
12694		if (INTERVALS[unit].common && adapter.diff(max, min, unit) >= ticks.length) {
12695			return unit;
12696		}
12697	}
12698
12699	return UNITS[minUnit ? UNITS.indexOf(minUnit) : 0];
12700}
12701
12702function determineMajorUnit(unit) {
12703	for (var i = UNITS.indexOf(unit) + 1, ilen = UNITS.length; i < ilen; ++i) {
12704		if (INTERVALS[UNITS[i]].common) {
12705			return UNITS[i];
12706		}
12707	}
12708}
12709
12710/**
12711 * Generates a maximum of `capacity` timestamps between min and max, rounded to the
12712 * `minor` unit, aligned on the `major` unit and using the given scale time `options`.
12713 * Important: this method can return ticks outside the min and max range, it's the
12714 * responsibility of the calling code to clamp values if needed.
12715 */
12716function generate(min, max, capacity, options) {
12717	var timeOpts = options.time;
12718	var minor = timeOpts.unit || determineUnitForAutoTicks(timeOpts.minUnit, min, max, capacity);
12719	var major = determineMajorUnit(minor);
12720	var stepSize = valueOrDefault$a(timeOpts.stepSize, timeOpts.unitStepSize);
12721	var weekday = minor === 'week' ? timeOpts.isoWeekday : false;
12722	var majorTicksEnabled = options.ticks.major.enabled;
12723	var interval = INTERVALS[minor];
12724	var first = min;
12725	var last = max;
12726	var ticks = [];
12727	var time;
12728
12729	if (!stepSize) {
12730		stepSize = determineStepSize(min, max, minor, capacity);
12731	}
12732
12733	// For 'week' unit, handle the first day of week option
12734	if (weekday) {
12735		first = +adapter.startOf(first, 'isoWeek', weekday);
12736		last = +adapter.startOf(last, 'isoWeek', weekday);
12737	}
12738
12739	// Align first/last ticks on unit
12740	first = +adapter.startOf(first, weekday ? 'day' : minor);
12741	last = +adapter.startOf(last, weekday ? 'day' : minor);
12742
12743	// Make sure that the last tick include max
12744	if (last < max) {
12745		last = +adapter.add(last, 1, minor);
12746	}
12747
12748	time = first;
12749
12750	if (majorTicksEnabled && major && !weekday && !timeOpts.round) {
12751		// Align the first tick on the previous `minor` unit aligned on the `major` unit:
12752		// we first aligned time on the previous `major` unit then add the number of full
12753		// stepSize there is between first and the previous major time.
12754		time = +adapter.startOf(time, major);
12755		time = +adapter.add(time, ~~((first - time) / (interval.size * stepSize)) * stepSize, minor);
12756	}
12757
12758	for (; time < last; time = +adapter.add(time, stepSize, minor)) {
12759		ticks.push(+time);
12760	}
12761
12762	ticks.push(+time);
12763
12764	return ticks;
12765}
12766
12767/**
12768 * Returns the start and end offsets from edges in the form of {start, end}
12769 * where each value is a relative width to the scale and ranges between 0 and 1.
12770 * They add extra margins on the both sides by scaling down the original scale.
12771 * Offsets are added when the `offset` option is true.
12772 */
12773function computeOffsets(table, ticks, min, max, options) {
12774	var start = 0;
12775	var end = 0;
12776	var first, last;
12777
12778	if (options.offset && ticks.length) {
12779		if (!options.time.min) {
12780			first = interpolate$1(table, 'time', ticks[0], 'pos');
12781			if (ticks.length === 1) {
12782				start = 1 - first;
12783			} else {
12784				start = (interpolate$1(table, 'time', ticks[1], 'pos') - first) / 2;
12785			}
12786		}
12787		if (!options.time.max) {
12788			last = interpolate$1(table, 'time', ticks[ticks.length - 1], 'pos');
12789			if (ticks.length === 1) {
12790				end = last;
12791			} else {
12792				end = (last - interpolate$1(table, 'time', ticks[ticks.length - 2], 'pos')) / 2;
12793			}
12794		}
12795	}
12796
12797	return {start: start, end: end};
12798}
12799
12800function ticksFromTimestamps(values, majorUnit) {
12801	var ticks = [];
12802	var i, ilen, value, major;
12803
12804	for (i = 0, ilen = values.length; i < ilen; ++i) {
12805		value = values[i];
12806		major = majorUnit ? value === +adapter.startOf(value, majorUnit) : false;
12807
12808		ticks.push({
12809			value: value,
12810			major: major
12811		});
12812	}
12813
12814	return ticks;
12815}
12816
12817/**
12818 * Return the time format for the label with the most parts (milliseconds, second, etc.)
12819 */
12820function determineLabelFormat(timestamps) {
12821	var presets = adapter.presets();
12822	var ilen = timestamps.length;
12823	var i, ts, hasTime;
12824
12825	for (i = 0; i < ilen; i++) {
12826		ts = timestamps[i];
12827		if (ts % INTERVALS.second.size !== 0) {
12828			return presets.full;
12829		}
12830		if (!hasTime && adapter.startOf(ts, 'day') !== ts) {
12831			hasTime = true;
12832		}
12833	}
12834	if (hasTime) {
12835		return presets.time;
12836	}
12837	return presets.date;
12838}
12839
12840var defaultConfig$4 = {
12841	position: 'bottom',
12842
12843	/**
12844	 * Data distribution along the scale:
12845	 * - 'linear': data are spread according to their time (distances can vary),
12846	 * - 'series': data are spread at the same distance from each other.
12847	 * @see https://github.com/chartjs/Chart.js/pull/4507
12848	 * @since 2.7.0
12849	 */
12850	distribution: 'linear',
12851
12852	/**
12853	 * Scale boundary strategy (bypassed by min/max time options)
12854	 * - `data`: make sure data are fully visible, ticks outside are removed
12855	 * - `ticks`: make sure ticks are fully visible, data outside are truncated
12856	 * @see https://github.com/chartjs/Chart.js/pull/4556
12857	 * @since 2.7.0
12858	 */
12859	bounds: 'data',
12860
12861	time: {
12862		parser: false, // false == a pattern string from https://momentjs.com/docs/#/parsing/string-format/ or a custom callback that converts its argument to a moment
12863		format: false, // DEPRECATED false == date objects, moment object, callback or a pattern string from https://momentjs.com/docs/#/parsing/string-format/
12864		unit: false, // false == automatic or override with week, month, year, etc.
12865		round: false, // none, or override with week, month, year, etc.
12866		displayFormat: false, // DEPRECATED
12867		isoWeekday: false, // override week start day - see https://momentjs.com/docs/#/get-set/iso-weekday/
12868		minUnit: 'millisecond',
12869		displayFormats: {}
12870	},
12871	ticks: {
12872		autoSkip: false,
12873
12874		/**
12875		 * Ticks generation input values:
12876		 * - 'auto': generates "optimal" ticks based on scale size and time options.
12877		 * - 'data': generates ticks from data (including labels from data {t|x|y} objects).
12878		 * - 'labels': generates ticks from user given `data.labels` values ONLY.
12879		 * @see https://github.com/chartjs/Chart.js/pull/4507
12880		 * @since 2.7.0
12881		 */
12882		source: 'auto',
12883
12884		major: {
12885			enabled: false
12886		}
12887	}
12888};
12889
12890var scale_time = core_scale.extend({
12891	initialize: function() {
12892		this.mergeTicksOptions();
12893		core_scale.prototype.initialize.call(this);
12894	},
12895
12896	update: function() {
12897		var me = this;
12898		var options = me.options;
12899		var time = options.time || (options.time = {});
12900
12901		// DEPRECATIONS: output a message only one time per update
12902		if (time.format) {
12903			console.warn('options.time.format is deprecated and replaced by options.time.parser.');
12904		}
12905
12906		// Backward compatibility: before introducing adapter, `displayFormats` was
12907		// supposed to contain *all* unit/string pairs but this can't be resolved
12908		// when loading the scale (adapters are loaded afterward), so let's populate
12909		// missing formats on update
12910		helpers$1.mergeIf(time.displayFormats, adapter.formats());
12911
12912		return core_scale.prototype.update.apply(me, arguments);
12913	},
12914
12915	/**
12916	 * Allows data to be referenced via 't' attribute
12917	 */
12918	getRightValue: function(rawValue) {
12919		if (rawValue && rawValue.t !== undefined) {
12920			rawValue = rawValue.t;
12921		}
12922		return core_scale.prototype.getRightValue.call(this, rawValue);
12923	},
12924
12925	determineDataLimits: function() {
12926		var me = this;
12927		var chart = me.chart;
12928		var timeOpts = me.options.time;
12929		var unit = timeOpts.unit || 'day';
12930		var min = MAX_INTEGER;
12931		var max = MIN_INTEGER;
12932		var timestamps = [];
12933		var datasets = [];
12934		var labels = [];
12935		var i, j, ilen, jlen, data, timestamp;
12936		var dataLabels = chart.data.labels || [];
12937
12938		// Convert labels to timestamps
12939		for (i = 0, ilen = dataLabels.length; i < ilen; ++i) {
12940			labels.push(parse(dataLabels[i], me));
12941		}
12942
12943		// Convert data to timestamps
12944		for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
12945			if (chart.isDatasetVisible(i)) {
12946				data = chart.data.datasets[i].data;
12947
12948				// Let's consider that all data have the same format.
12949				if (helpers$1.isObject(data[0])) {
12950					datasets[i] = [];
12951
12952					for (j = 0, jlen = data.length; j < jlen; ++j) {
12953						timestamp = parse(data[j], me);
12954						timestamps.push(timestamp);
12955						datasets[i][j] = timestamp;
12956					}
12957				} else {
12958					for (j = 0, jlen = labels.length; j < jlen; ++j) {
12959						timestamps.push(labels[j]);
12960					}
12961					datasets[i] = labels.slice(0);
12962				}
12963			} else {
12964				datasets[i] = [];
12965			}
12966		}
12967
12968		if (labels.length) {
12969			// Sort labels **after** data have been converted
12970			labels = arrayUnique(labels).sort(sorter);
12971			min = Math.min(min, labels[0]);
12972			max = Math.max(max, labels[labels.length - 1]);
12973		}
12974
12975		if (timestamps.length) {
12976			timestamps = arrayUnique(timestamps).sort(sorter);
12977			min = Math.min(min, timestamps[0]);
12978			max = Math.max(max, timestamps[timestamps.length - 1]);
12979		}
12980
12981		min = parse(timeOpts.min, me) || min;
12982		max = parse(timeOpts.max, me) || max;
12983
12984		// In case there is no valid min/max, set limits based on unit time option
12985		min = min === MAX_INTEGER ? +adapter.startOf(+new Date(), unit) : min;
12986		max = max === MIN_INTEGER ? +adapter.endOf(+new Date(), unit) + 1 : max;
12987
12988		// Make sure that max is strictly higher than min (required by the lookup table)
12989		me.min = Math.min(min, max);
12990		me.max = Math.max(min + 1, max);
12991
12992		// PRIVATE
12993		me._horizontal = me.isHorizontal();
12994		me._table = [];
12995		me._timestamps = {
12996			data: timestamps,
12997			datasets: datasets,
12998			labels: labels
12999		};
13000	},
13001
13002	buildTicks: function() {
13003		var me = this;
13004		var min = me.min;
13005		var max = me.max;
13006		var options = me.options;
13007		var timeOpts = options.time;
13008		var timestamps = [];
13009		var ticks = [];
13010		var i, ilen, timestamp;
13011
13012		switch (options.ticks.source) {
13013		case 'data':
13014			timestamps = me._timestamps.data;
13015			break;
13016		case 'labels':
13017			timestamps = me._timestamps.labels;
13018			break;
13019		case 'auto':
13020		default:
13021			timestamps = generate(min, max, me.getLabelCapacity(min), options);
13022		}
13023
13024		if (options.bounds === 'ticks' && timestamps.length) {
13025			min = timestamps[0];
13026			max = timestamps[timestamps.length - 1];
13027		}
13028
13029		// Enforce limits with user min/max options
13030		min = parse(timeOpts.min, me) || min;
13031		max = parse(timeOpts.max, me) || max;
13032
13033		// Remove ticks outside the min/max range
13034		for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
13035			timestamp = timestamps[i];
13036			if (timestamp >= min && timestamp <= max) {
13037				ticks.push(timestamp);
13038			}
13039		}
13040
13041		me.min = min;
13042		me.max = max;
13043
13044		// PRIVATE
13045		me._unit = timeOpts.unit || determineUnitForFormatting(ticks, timeOpts.minUnit, me.min, me.max);
13046		me._majorUnit = determineMajorUnit(me._unit);
13047		me._table = buildLookupTable(me._timestamps.data, min, max, options.distribution);
13048		me._offsets = computeOffsets(me._table, ticks, min, max, options);
13049		me._labelFormat = determineLabelFormat(me._timestamps.data);
13050
13051		if (options.ticks.reverse) {
13052			ticks.reverse();
13053		}
13054
13055		return ticksFromTimestamps(ticks, me._majorUnit);
13056	},
13057
13058	getLabelForIndex: function(index, datasetIndex) {
13059		var me = this;
13060		var data = me.chart.data;
13061		var timeOpts = me.options.time;
13062		var label = data.labels && index < data.labels.length ? data.labels[index] : '';
13063		var value = data.datasets[datasetIndex].data[index];
13064
13065		if (helpers$1.isObject(value)) {
13066			label = me.getRightValue(value);
13067		}
13068		if (timeOpts.tooltipFormat) {
13069			return adapter.format(toTimestamp(label, timeOpts), timeOpts.tooltipFormat);
13070		}
13071		if (typeof label === 'string') {
13072			return label;
13073		}
13074
13075		return adapter.format(toTimestamp(label, timeOpts), me._labelFormat);
13076	},
13077
13078	/**
13079	 * Function to format an individual tick mark
13080	 * @private
13081	 */
13082	tickFormatFunction: function(time, index, ticks, format) {
13083		var me = this;
13084		var options = me.options;
13085		var formats = options.time.displayFormats;
13086		var minorFormat = formats[me._unit];
13087		var majorUnit = me._majorUnit;
13088		var majorFormat = formats[majorUnit];
13089		var majorTime = +adapter.startOf(time, majorUnit);
13090		var majorTickOpts = options.ticks.major;
13091		var major = majorTickOpts.enabled && majorUnit && majorFormat && time === majorTime;
13092		var label = adapter.format(time, format ? format : major ? majorFormat : minorFormat);
13093		var tickOpts = major ? majorTickOpts : options.ticks.minor;
13094		var formatter = valueOrDefault$a(tickOpts.callback, tickOpts.userCallback);
13095
13096		return formatter ? formatter(label, index, ticks) : label;
13097	},
13098
13099	convertTicksToLabels: function(ticks) {
13100		var labels = [];
13101		var i, ilen;
13102
13103		for (i = 0, ilen = ticks.length; i < ilen; ++i) {
13104			labels.push(this.tickFormatFunction(ticks[i].value, i, ticks));
13105		}
13106
13107		return labels;
13108	},
13109
13110	/**
13111	 * @private
13112	 */
13113	getPixelForOffset: function(time) {
13114		var me = this;
13115		var isReverse = me.options.ticks.reverse;
13116		var size = me._horizontal ? me.width : me.height;
13117		var start = me._horizontal ? isReverse ? me.right : me.left : isReverse ? me.bottom : me.top;
13118		var pos = interpolate$1(me._table, 'time', time, 'pos');
13119		var offset = size * (me._offsets.start + pos) / (me._offsets.start + 1 + me._offsets.end);
13120
13121		return isReverse ? start - offset : start + offset;
13122	},
13123
13124	getPixelForValue: function(value, index, datasetIndex) {
13125		var me = this;
13126		var time = null;
13127
13128		if (index !== undefined && datasetIndex !== undefined) {
13129			time = me._timestamps.datasets[datasetIndex][index];
13130		}
13131
13132		if (time === null) {
13133			time = parse(value, me);
13134		}
13135
13136		if (time !== null) {
13137			return me.getPixelForOffset(time);
13138		}
13139	},
13140
13141	getPixelForTick: function(index) {
13142		var ticks = this.getTicks();
13143		return index >= 0 && index < ticks.length ?
13144			this.getPixelForOffset(ticks[index].value) :
13145			null;
13146	},
13147
13148	getValueForPixel: function(pixel) {
13149		var me = this;
13150		var size = me._horizontal ? me.width : me.height;
13151		var start = me._horizontal ? me.left : me.top;
13152		var pos = (size ? (pixel - start) / size : 0) * (me._offsets.start + 1 + me._offsets.start) - me._offsets.end;
13153		var time = interpolate$1(me._table, 'pos', pos, 'time');
13154
13155		// DEPRECATION, we should return time directly
13156		return adapter._create(time);
13157	},
13158
13159	/**
13160	 * Crude approximation of what the label width might be
13161	 * @private
13162	 */
13163	getLabelWidth: function(label) {
13164		var me = this;
13165		var ticksOpts = me.options.ticks;
13166		var tickLabelWidth = me.ctx.measureText(label).width;
13167		var angle = helpers$1.toRadians(ticksOpts.maxRotation);
13168		var cosRotation = Math.cos(angle);
13169		var sinRotation = Math.sin(angle);
13170		var tickFontSize = valueOrDefault$a(ticksOpts.fontSize, core_defaults.global.defaultFontSize);
13171
13172		return (tickLabelWidth * cosRotation) + (tickFontSize * sinRotation);
13173	},
13174
13175	/**
13176	 * @private
13177	 */
13178	getLabelCapacity: function(exampleTime) {
13179		var me = this;
13180
13181		// pick the longest format (milliseconds) for guestimation
13182		var format = me.options.time.displayFormats.millisecond;
13183		var exampleLabel = me.tickFormatFunction(exampleTime, 0, [], format);
13184		var tickLabelWidth = me.getLabelWidth(exampleLabel);
13185		var innerWidth = me.isHorizontal() ? me.width : me.height;
13186		var capacity = Math.floor(innerWidth / tickLabelWidth);
13187
13188		return capacity > 0 ? capacity : 1;
13189	}
13190});
13191
13192// INTERNAL: static default options, registered in src/chart.js
13193var _defaults$4 = defaultConfig$4;
13194scale_time._defaults = _defaults$4;
13195
13196var scales = {
13197	category: scale_category,
13198	linear: scale_linear,
13199	logarithmic: scale_logarithmic,
13200	radialLinear: scale_radialLinear,
13201	time: scale_time
13202};
13203
13204var adapter$1 = core_adapters._date;
13205
13206
13207var FORMATS = {
13208	millisecond: 'h:mm:ss.SSS a',
13209	second: 'h:mm:ss a',
13210	minute: 'h:mm a',
13211	hour: 'hA',
13212	day: 'MMM D',
13213	week: 'll',
13214	month: 'MMM YYYY',
13215	quarter: '[Q]Q - YYYY',
13216	year: 'YYYY'
13217};
13218
13219var PRESETS = {
13220	full: 'MMM D, YYYY h:mm:ss.SSS a',
13221	time: 'MMM D, YYYY h:mm:ss a',
13222	date: 'MMM D, YYYY'
13223};
13224
13225helpers_core.merge(adapter$1, moment ? {
13226	_id: 'moment', // DEBUG ONLY
13227
13228	formats: function() {
13229		return FORMATS;
13230	},
13231
13232	presets: function() {
13233		return PRESETS;
13234	},
13235
13236	parse: function(value, format) {
13237		if (typeof value === 'string' && typeof format === 'string') {
13238			value = moment(value, format);
13239		} else if (!(value instanceof moment)) {
13240			value = moment(value);
13241		}
13242		return value.isValid() ? +value : null;
13243	},
13244
13245	format: function(time, format) {
13246		return moment(time).format(format);
13247	},
13248
13249	add: function(time, amount, unit) {
13250		return +moment(time).add(amount, unit);
13251	},
13252
13253	diff: function(max, min, unit) {
13254		return moment.duration(moment(max).diff(moment(min))).as(unit);
13255	},
13256
13257	startOf: function(time, unit, weekday) {
13258		time = moment(time);
13259		if (unit === 'isoWeek') {
13260			return +time.isoWeekday(weekday);
13261		}
13262		return +time.startOf(unit);
13263	},
13264
13265	endOf: function(time, unit) {
13266		return +moment(time).endOf(unit);
13267	},
13268
13269	// DEPRECATIONS
13270
13271	/**
13272	 * Provided for backward compatibility with scale.getValueForPixel().
13273	 * @deprecated since version 2.8.0
13274	 * @todo remove at version 3
13275	 * @private
13276	 */
13277	_create: function(time) {
13278		return moment(time);
13279	},
13280} : {});
13281
13282core_defaults._set('global', {
13283	plugins: {
13284		filler: {
13285			propagate: true
13286		}
13287	}
13288});
13289
13290var mappers = {
13291	dataset: function(source) {
13292		var index = source.fill;
13293		var chart = source.chart;
13294		var meta = chart.getDatasetMeta(index);
13295		var visible = meta && chart.isDatasetVisible(index);
13296		var points = (visible && meta.dataset._children) || [];
13297		var length = points.length || 0;
13298
13299		return !length ? null : function(point, i) {
13300			return (i < length && points[i]._view) || null;
13301		};
13302	},
13303
13304	boundary: function(source) {
13305		var boundary = source.boundary;
13306		var x = boundary ? boundary.x : null;
13307		var y = boundary ? boundary.y : null;
13308
13309		return function(point) {
13310			return {
13311				x: x === null ? point.x : x,
13312				y: y === null ? point.y : y,
13313			};
13314		};
13315	}
13316};
13317
13318// @todo if (fill[0] === '#')
13319function decodeFill(el, index, count) {
13320	var model = el._model || {};
13321	var fill = model.fill;
13322	var target;
13323
13324	if (fill === undefined) {
13325		fill = !!model.backgroundColor;
13326	}
13327
13328	if (fill === false || fill === null) {
13329		return false;
13330	}
13331
13332	if (fill === true) {
13333		return 'origin';
13334	}
13335
13336	target = parseFloat(fill, 10);
13337	if (isFinite(target) && Math.floor(target) === target) {
13338		if (fill[0] === '-' || fill[0] === '+') {
13339			target = index + target;
13340		}
13341
13342		if (target === index || target < 0 || target >= count) {
13343			return false;
13344		}
13345
13346		return target;
13347	}
13348
13349	switch (fill) {
13350	// compatibility
13351	case 'bottom':
13352		return 'start';
13353	case 'top':
13354		return 'end';
13355	case 'zero':
13356		return 'origin';
13357	// supported boundaries
13358	case 'origin':
13359	case 'start':
13360	case 'end':
13361		return fill;
13362	// invalid fill values
13363	default:
13364		return false;
13365	}
13366}
13367
13368function computeBoundary(source) {
13369	var model = source.el._model || {};
13370	var scale = source.el._scale || {};
13371	var fill = source.fill;
13372	var target = null;
13373	var horizontal;
13374
13375	if (isFinite(fill)) {
13376		return null;
13377	}
13378
13379	// Backward compatibility: until v3, we still need to support boundary values set on
13380	// the model (scaleTop, scaleBottom and scaleZero) because some external plugins and
13381	// controllers might still use it (e.g. the Smith chart).
13382
13383	if (fill === 'start') {
13384		target = model.scaleBottom === undefined ? scale.bottom : model.scaleBottom;
13385	} else if (fill === 'end') {
13386		target = model.scaleTop === undefined ? scale.top : model.scaleTop;
13387	} else if (model.scaleZero !== undefined) {
13388		target = model.scaleZero;
13389	} else if (scale.getBasePosition) {
13390		target = scale.getBasePosition();
13391	} else if (scale.getBasePixel) {
13392		target = scale.getBasePixel();
13393	}
13394
13395	if (target !== undefined && target !== null) {
13396		if (target.x !== undefined && target.y !== undefined) {
13397			return target;
13398		}
13399
13400		if (helpers$1.isFinite(target)) {
13401			horizontal = scale.isHorizontal();
13402			return {
13403				x: horizontal ? target : null,
13404				y: horizontal ? null : target
13405			};
13406		}
13407	}
13408
13409	return null;
13410}
13411
13412function resolveTarget(sources, index, propagate) {
13413	var source = sources[index];
13414	var fill = source.fill;
13415	var visited = [index];
13416	var target;
13417
13418	if (!propagate) {
13419		return fill;
13420	}
13421
13422	while (fill !== false && visited.indexOf(fill) === -1) {
13423		if (!isFinite(fill)) {
13424			return fill;
13425		}
13426
13427		target = sources[fill];
13428		if (!target) {
13429			return false;
13430		}
13431
13432		if (target.visible) {
13433			return fill;
13434		}
13435
13436		visited.push(fill);
13437		fill = target.fill;
13438	}
13439
13440	return false;
13441}
13442
13443function createMapper(source) {
13444	var fill = source.fill;
13445	var type = 'dataset';
13446
13447	if (fill === false) {
13448		return null;
13449	}
13450
13451	if (!isFinite(fill)) {
13452		type = 'boundary';
13453	}
13454
13455	return mappers[type](source);
13456}
13457
13458function isDrawable(point) {
13459	return point && !point.skip;
13460}
13461
13462function drawArea(ctx, curve0, curve1, len0, len1) {
13463	var i;
13464
13465	if (!len0 || !len1) {
13466		return;
13467	}
13468
13469	// building first area curve (normal)
13470	ctx.moveTo(curve0[0].x, curve0[0].y);
13471	for (i = 1; i < len0; ++i) {
13472		helpers$1.canvas.lineTo(ctx, curve0[i - 1], curve0[i]);
13473	}
13474
13475	// joining the two area curves
13476	ctx.lineTo(curve1[len1 - 1].x, curve1[len1 - 1].y);
13477
13478	// building opposite area curve (reverse)
13479	for (i = len1 - 1; i > 0; --i) {
13480		helpers$1.canvas.lineTo(ctx, curve1[i], curve1[i - 1], true);
13481	}
13482}
13483
13484function doFill(ctx, points, mapper, view, color, loop) {
13485	var count = points.length;
13486	var span = view.spanGaps;
13487	var curve0 = [];
13488	var curve1 = [];
13489	var len0 = 0;
13490	var len1 = 0;
13491	var i, ilen, index, p0, p1, d0, d1;
13492
13493	ctx.beginPath();
13494
13495	for (i = 0, ilen = (count + !!loop); i < ilen; ++i) {
13496		index = i % count;
13497		p0 = points[index]._view;
13498		p1 = mapper(p0, index, view);
13499		d0 = isDrawable(p0);
13500		d1 = isDrawable(p1);
13501
13502		if (d0 && d1) {
13503			len0 = curve0.push(p0);
13504			len1 = curve1.push(p1);
13505		} else if (len0 && len1) {
13506			if (!span) {
13507				drawArea(ctx, curve0, curve1, len0, len1);
13508				len0 = len1 = 0;
13509				curve0 = [];
13510				curve1 = [];
13511			} else {
13512				if (d0) {
13513					curve0.push(p0);
13514				}
13515				if (d1) {
13516					curve1.push(p1);
13517				}
13518			}
13519		}
13520	}
13521
13522	drawArea(ctx, curve0, curve1, len0, len1);
13523
13524	ctx.closePath();
13525	ctx.fillStyle = color;
13526	ctx.fill();
13527}
13528
13529var plugin_filler = {
13530	id: 'filler',
13531
13532	afterDatasetsUpdate: function(chart, options) {
13533		var count = (chart.data.datasets || []).length;
13534		var propagate = options.propagate;
13535		var sources = [];
13536		var meta, i, el, source;
13537
13538		for (i = 0; i < count; ++i) {
13539			meta = chart.getDatasetMeta(i);
13540			el = meta.dataset;
13541			source = null;
13542
13543			if (el && el._model && el instanceof elements.Line) {
13544				source = {
13545					visible: chart.isDatasetVisible(i),
13546					fill: decodeFill(el, i, count),
13547					chart: chart,
13548					el: el
13549				};
13550			}
13551
13552			meta.$filler = source;
13553			sources.push(source);
13554		}
13555
13556		for (i = 0; i < count; ++i) {
13557			source = sources[i];
13558			if (!source) {
13559				continue;
13560			}
13561
13562			source.fill = resolveTarget(sources, i, propagate);
13563			source.boundary = computeBoundary(source);
13564			source.mapper = createMapper(source);
13565		}
13566	},
13567
13568	beforeDatasetDraw: function(chart, args) {
13569		var meta = args.meta.$filler;
13570		if (!meta) {
13571			return;
13572		}
13573
13574		var ctx = chart.ctx;
13575		var el = meta.el;
13576		var view = el._view;
13577		var points = el._children || [];
13578		var mapper = meta.mapper;
13579		var color = view.backgroundColor || core_defaults.global.defaultColor;
13580
13581		if (mapper && color && points.length) {
13582			helpers$1.canvas.clipArea(ctx, chart.chartArea);
13583			doFill(ctx, points, mapper, view, color, el._loop);
13584			helpers$1.canvas.unclipArea(ctx);
13585		}
13586	}
13587};
13588
13589var noop$1 = helpers$1.noop;
13590var valueOrDefault$b = helpers$1.valueOrDefault;
13591
13592core_defaults._set('global', {
13593	legend: {
13594		display: true,
13595		position: 'top',
13596		fullWidth: true,
13597		reverse: false,
13598		weight: 1000,
13599
13600		// a callback that will handle
13601		onClick: function(e, legendItem) {
13602			var index = legendItem.datasetIndex;
13603			var ci = this.chart;
13604			var meta = ci.getDatasetMeta(index);
13605
13606			// See controller.isDatasetVisible comment
13607			meta.hidden = meta.hidden === null ? !ci.data.datasets[index].hidden : null;
13608
13609			// We hid a dataset ... rerender the chart
13610			ci.update();
13611		},
13612
13613		onHover: null,
13614
13615		labels: {
13616			boxWidth: 40,
13617			padding: 10,
13618			// Generates labels shown in the legend
13619			// Valid properties to return:
13620			// text : text to display
13621			// fillStyle : fill of coloured box
13622			// strokeStyle: stroke of coloured box
13623			// hidden : if this legend item refers to a hidden item
13624			// lineCap : cap style for line
13625			// lineDash
13626			// lineDashOffset :
13627			// lineJoin :
13628			// lineWidth :
13629			generateLabels: function(chart) {
13630				var data = chart.data;
13631				return helpers$1.isArray(data.datasets) ? data.datasets.map(function(dataset, i) {
13632					return {
13633						text: dataset.label,
13634						fillStyle: (!helpers$1.isArray(dataset.backgroundColor) ? dataset.backgroundColor : dataset.backgroundColor[0]),
13635						hidden: !chart.isDatasetVisible(i),
13636						lineCap: dataset.borderCapStyle,
13637						lineDash: dataset.borderDash,
13638						lineDashOffset: dataset.borderDashOffset,
13639						lineJoin: dataset.borderJoinStyle,
13640						lineWidth: dataset.borderWidth,
13641						strokeStyle: dataset.borderColor,
13642						pointStyle: dataset.pointStyle,
13643
13644						// Below is extra data used for toggling the datasets
13645						datasetIndex: i
13646					};
13647				}, this) : [];
13648			}
13649		}
13650	},
13651
13652	legendCallback: function(chart) {
13653		var text = [];
13654		text.push('<ul class="' + chart.id + '-legend">');
13655		for (var i = 0; i < chart.data.datasets.length; i++) {
13656			text.push('<li><span style="background-color:' + chart.data.datasets[i].backgroundColor + '"></span>');
13657			if (chart.data.datasets[i].label) {
13658				text.push(chart.data.datasets[i].label);
13659			}
13660			text.push('</li>');
13661		}
13662		text.push('</ul>');
13663		return text.join('');
13664	}
13665});
13666
13667/**
13668 * Helper function to get the box width based on the usePointStyle option
13669 * @param labelopts {Object} the label options on the legend
13670 * @param fontSize {Number} the label font size
13671 * @return {Number} width of the color box area
13672 */
13673function getBoxWidth(labelOpts, fontSize) {
13674	return labelOpts.usePointStyle ?
13675		fontSize * Math.SQRT2 :
13676		labelOpts.boxWidth;
13677}
13678
13679/**
13680 * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
13681 */
13682var Legend = core_element.extend({
13683
13684	initialize: function(config) {
13685		helpers$1.extend(this, config);
13686
13687		// Contains hit boxes for each dataset (in dataset order)
13688		this.legendHitBoxes = [];
13689
13690		// Are we in doughnut mode which has a different data type
13691		this.doughnutMode = false;
13692	},
13693
13694	// These methods are ordered by lifecycle. Utilities then follow.
13695	// Any function defined here is inherited by all legend types.
13696	// Any function can be extended by the legend type
13697
13698	beforeUpdate: noop$1,
13699	update: function(maxWidth, maxHeight, margins) {
13700		var me = this;
13701
13702		// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
13703		me.beforeUpdate();
13704
13705		// Absorb the master measurements
13706		me.maxWidth = maxWidth;
13707		me.maxHeight = maxHeight;
13708		me.margins = margins;
13709
13710		// Dimensions
13711		me.beforeSetDimensions();
13712		me.setDimensions();
13713		me.afterSetDimensions();
13714		// Labels
13715		me.beforeBuildLabels();
13716		me.buildLabels();
13717		me.afterBuildLabels();
13718
13719		// Fit
13720		me.beforeFit();
13721		me.fit();
13722		me.afterFit();
13723		//
13724		me.afterUpdate();
13725
13726		return me.minSize;
13727	},
13728	afterUpdate: noop$1,
13729
13730	//
13731
13732	beforeSetDimensions: noop$1,
13733	setDimensions: function() {
13734		var me = this;
13735		// Set the unconstrained dimension before label rotation
13736		if (me.isHorizontal()) {
13737			// Reset position before calculating rotation
13738			me.width = me.maxWidth;
13739			me.left = 0;
13740			me.right = me.width;
13741		} else {
13742			me.height = me.maxHeight;
13743
13744			// Reset position before calculating rotation
13745			me.top = 0;
13746			me.bottom = me.height;
13747		}
13748
13749		// Reset padding
13750		me.paddingLeft = 0;
13751		me.paddingTop = 0;
13752		me.paddingRight = 0;
13753		me.paddingBottom = 0;
13754
13755		// Reset minSize
13756		me.minSize = {
13757			width: 0,
13758			height: 0
13759		};
13760	},
13761	afterSetDimensions: noop$1,
13762
13763	//
13764
13765	beforeBuildLabels: noop$1,
13766	buildLabels: function() {
13767		var me = this;
13768		var labelOpts = me.options.labels || {};
13769		var legendItems = helpers$1.callback(labelOpts.generateLabels, [me.chart], me) || [];
13770
13771		if (labelOpts.filter) {
13772			legendItems = legendItems.filter(function(item) {
13773				return labelOpts.filter(item, me.chart.data);
13774			});
13775		}
13776
13777		if (me.options.reverse) {
13778			legendItems.reverse();
13779		}
13780
13781		me.legendItems = legendItems;
13782	},
13783	afterBuildLabels: noop$1,
13784
13785	//
13786
13787	beforeFit: noop$1,
13788	fit: function() {
13789		var me = this;
13790		var opts = me.options;
13791		var labelOpts = opts.labels;
13792		var display = opts.display;
13793
13794		var ctx = me.ctx;
13795
13796		var labelFont = helpers$1.options._parseFont(labelOpts);
13797		var fontSize = labelFont.size;
13798
13799		// Reset hit boxes
13800		var hitboxes = me.legendHitBoxes = [];
13801
13802		var minSize = me.minSize;
13803		var isHorizontal = me.isHorizontal();
13804
13805		if (isHorizontal) {
13806			minSize.width = me.maxWidth; // fill all the width
13807			minSize.height = display ? 10 : 0;
13808		} else {
13809			minSize.width = display ? 10 : 0;
13810			minSize.height = me.maxHeight; // fill all the height
13811		}
13812
13813		// Increase sizes here
13814		if (display) {
13815			ctx.font = labelFont.string;
13816
13817			if (isHorizontal) {
13818				// Labels
13819
13820				// Width of each line of legend boxes. Labels wrap onto multiple lines when there are too many to fit on one
13821				var lineWidths = me.lineWidths = [0];
13822				var totalHeight = 0;
13823
13824				ctx.textAlign = 'left';
13825				ctx.textBaseline = 'top';
13826
13827				helpers$1.each(me.legendItems, function(legendItem, i) {
13828					var boxWidth = getBoxWidth(labelOpts, fontSize);
13829					var width = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
13830
13831					if (i === 0 || lineWidths[lineWidths.length - 1] + width + labelOpts.padding > minSize.width) {
13832						totalHeight += fontSize + labelOpts.padding;
13833						lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = labelOpts.padding;
13834					}
13835
13836					// Store the hitbox width and height here. Final position will be updated in `draw`
13837					hitboxes[i] = {
13838						left: 0,
13839						top: 0,
13840						width: width,
13841						height: fontSize
13842					};
13843
13844					lineWidths[lineWidths.length - 1] += width + labelOpts.padding;
13845				});
13846
13847				minSize.height += totalHeight;
13848
13849			} else {
13850				var vPadding = labelOpts.padding;
13851				var columnWidths = me.columnWidths = [];
13852				var totalWidth = labelOpts.padding;
13853				var currentColWidth = 0;
13854				var currentColHeight = 0;
13855				var itemHeight = fontSize + vPadding;
13856
13857				helpers$1.each(me.legendItems, function(legendItem, i) {
13858					var boxWidth = getBoxWidth(labelOpts, fontSize);
13859					var itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
13860
13861					// If too tall, go to new column
13862					if (i > 0 && currentColHeight + itemHeight > minSize.height - vPadding) {
13863						totalWidth += currentColWidth + labelOpts.padding;
13864						columnWidths.push(currentColWidth); // previous column width
13865
13866						currentColWidth = 0;
13867						currentColHeight = 0;
13868					}
13869
13870					// Get max width
13871					currentColWidth = Math.max(currentColWidth, itemWidth);
13872					currentColHeight += itemHeight;
13873
13874					// Store the hitbox width and height here. Final position will be updated in `draw`
13875					hitboxes[i] = {
13876						left: 0,
13877						top: 0,
13878						width: itemWidth,
13879						height: fontSize
13880					};
13881				});
13882
13883				totalWidth += currentColWidth;
13884				columnWidths.push(currentColWidth);
13885				minSize.width += totalWidth;
13886			}
13887		}
13888
13889		me.width = minSize.width;
13890		me.height = minSize.height;
13891	},
13892	afterFit: noop$1,
13893
13894	// Shared Methods
13895	isHorizontal: function() {
13896		return this.options.position === 'top' || this.options.position === 'bottom';
13897	},
13898
13899	// Actually draw the legend on the canvas
13900	draw: function() {
13901		var me = this;
13902		var opts = me.options;
13903		var labelOpts = opts.labels;
13904		var globalDefaults = core_defaults.global;
13905		var defaultColor = globalDefaults.defaultColor;
13906		var lineDefault = globalDefaults.elements.line;
13907		var legendWidth = me.width;
13908		var lineWidths = me.lineWidths;
13909
13910		if (opts.display) {
13911			var ctx = me.ctx;
13912			var fontColor = valueOrDefault$b(labelOpts.fontColor, globalDefaults.defaultFontColor);
13913			var labelFont = helpers$1.options._parseFont(labelOpts);
13914			var fontSize = labelFont.size;
13915			var cursor;
13916
13917			// Canvas setup
13918			ctx.textAlign = 'left';
13919			ctx.textBaseline = 'middle';
13920			ctx.lineWidth = 0.5;
13921			ctx.strokeStyle = fontColor; // for strikethrough effect
13922			ctx.fillStyle = fontColor; // render in correct colour
13923			ctx.font = labelFont.string;
13924
13925			var boxWidth = getBoxWidth(labelOpts, fontSize);
13926			var hitboxes = me.legendHitBoxes;
13927
13928			// current position
13929			var drawLegendBox = function(x, y, legendItem) {
13930				if (isNaN(boxWidth) || boxWidth <= 0) {
13931					return;
13932				}
13933
13934				// Set the ctx for the box
13935				ctx.save();
13936
13937				var lineWidth = valueOrDefault$b(legendItem.lineWidth, lineDefault.borderWidth);
13938				ctx.fillStyle = valueOrDefault$b(legendItem.fillStyle, defaultColor);
13939				ctx.lineCap = valueOrDefault$b(legendItem.lineCap, lineDefault.borderCapStyle);
13940				ctx.lineDashOffset = valueOrDefault$b(legendItem.lineDashOffset, lineDefault.borderDashOffset);
13941				ctx.lineJoin = valueOrDefault$b(legendItem.lineJoin, lineDefault.borderJoinStyle);
13942				ctx.lineWidth = lineWidth;
13943				ctx.strokeStyle = valueOrDefault$b(legendItem.strokeStyle, defaultColor);
13944
13945				if (ctx.setLineDash) {
13946					// IE 9 and 10 do not support line dash
13947					ctx.setLineDash(valueOrDefault$b(legendItem.lineDash, lineDefault.borderDash));
13948				}
13949
13950				if (opts.labels && opts.labels.usePointStyle) {
13951					// Recalculate x and y for drawPoint() because its expecting
13952					// x and y to be center of figure (instead of top left)
13953					var radius = fontSize * Math.SQRT2 / 2;
13954					var offSet = radius / Math.SQRT2;
13955					var centerX = x + offSet;
13956					var centerY = y + offSet;
13957
13958					// Draw pointStyle as legend symbol
13959					helpers$1.canvas.drawPoint(ctx, legendItem.pointStyle, radius, centerX, centerY);
13960				} else {
13961					// Draw box as legend symbol
13962					if (lineWidth !== 0) {
13963						ctx.strokeRect(x, y, boxWidth, fontSize);
13964					}
13965					ctx.fillRect(x, y, boxWidth, fontSize);
13966				}
13967
13968				ctx.restore();
13969			};
13970			var fillText = function(x, y, legendItem, textWidth) {
13971				var halfFontSize = fontSize / 2;
13972				var xLeft = boxWidth + halfFontSize + x;
13973				var yMiddle = y + halfFontSize;
13974
13975				ctx.fillText(legendItem.text, xLeft, yMiddle);
13976
13977				if (legendItem.hidden) {
13978					// Strikethrough the text if hidden
13979					ctx.beginPath();
13980					ctx.lineWidth = 2;
13981					ctx.moveTo(xLeft, yMiddle);
13982					ctx.lineTo(xLeft + textWidth, yMiddle);
13983					ctx.stroke();
13984				}
13985			};
13986
13987			// Horizontal
13988			var isHorizontal = me.isHorizontal();
13989			if (isHorizontal) {
13990				cursor = {
13991					x: me.left + ((legendWidth - lineWidths[0]) / 2) + labelOpts.padding,
13992					y: me.top + labelOpts.padding,
13993					line: 0
13994				};
13995			} else {
13996				cursor = {
13997					x: me.left + labelOpts.padding,
13998					y: me.top + labelOpts.padding,
13999					line: 0
14000				};
14001			}
14002
14003			var itemHeight = fontSize + labelOpts.padding;
14004			helpers$1.each(me.legendItems, function(legendItem, i) {
14005				var textWidth = ctx.measureText(legendItem.text).width;
14006				var width = boxWidth + (fontSize / 2) + textWidth;
14007				var x = cursor.x;
14008				var y = cursor.y;
14009
14010				// Use (me.left + me.minSize.width) and (me.top + me.minSize.height)
14011				// instead of me.right and me.bottom because me.width and me.height
14012				// may have been changed since me.minSize was calculated
14013				if (isHorizontal) {
14014					if (i > 0 && x + width + labelOpts.padding > me.left + me.minSize.width) {
14015						y = cursor.y += itemHeight;
14016						cursor.line++;
14017						x = cursor.x = me.left + ((legendWidth - lineWidths[cursor.line]) / 2) + labelOpts.padding;
14018					}
14019				} else if (i > 0 && y + itemHeight > me.top + me.minSize.height) {
14020					x = cursor.x = x + me.columnWidths[cursor.line] + labelOpts.padding;
14021					y = cursor.y = me.top + labelOpts.padding;
14022					cursor.line++;
14023				}
14024
14025				drawLegendBox(x, y, legendItem);
14026
14027				hitboxes[i].left = x;
14028				hitboxes[i].top = y;
14029
14030				// Fill the actual label
14031				fillText(x, y, legendItem, textWidth);
14032
14033				if (isHorizontal) {
14034					cursor.x += width + labelOpts.padding;
14035				} else {
14036					cursor.y += itemHeight;
14037				}
14038
14039			});
14040		}
14041	},
14042
14043	/**
14044	 * Handle an event
14045	 * @private
14046	 * @param {IEvent} event - The event to handle
14047	 * @return {Boolean} true if a change occured
14048	 */
14049	handleEvent: function(e) {
14050		var me = this;
14051		var opts = me.options;
14052		var type = e.type === 'mouseup' ? 'click' : e.type;
14053		var changed = false;
14054
14055		if (type === 'mousemove') {
14056			if (!opts.onHover) {
14057				return;
14058			}
14059		} else if (type === 'click') {
14060			if (!opts.onClick) {
14061				return;
14062			}
14063		} else {
14064			return;
14065		}
14066
14067		// Chart event already has relative position in it
14068		var x = e.x;
14069		var y = e.y;
14070
14071		if (x >= me.left && x <= me.right && y >= me.top && y <= me.bottom) {
14072			// See if we are touching one of the dataset boxes
14073			var lh = me.legendHitBoxes;
14074			for (var i = 0; i < lh.length; ++i) {
14075				var hitBox = lh[i];
14076
14077				if (x >= hitBox.left && x <= hitBox.left + hitBox.width && y >= hitBox.top && y <= hitBox.top + hitBox.height) {
14078					// Touching an element
14079					if (type === 'click') {
14080						// use e.native for backwards compatibility
14081						opts.onClick.call(me, e.native, me.legendItems[i]);
14082						changed = true;
14083						break;
14084					} else if (type === 'mousemove') {
14085						// use e.native for backwards compatibility
14086						opts.onHover.call(me, e.native, me.legendItems[i]);
14087						changed = true;
14088						break;
14089					}
14090				}
14091			}
14092		}
14093
14094		return changed;
14095	}
14096});
14097
14098function createNewLegendAndAttach(chart, legendOpts) {
14099	var legend = new Legend({
14100		ctx: chart.ctx,
14101		options: legendOpts,
14102		chart: chart
14103	});
14104
14105	core_layouts.configure(chart, legend, legendOpts);
14106	core_layouts.addBox(chart, legend);
14107	chart.legend = legend;
14108}
14109
14110var plugin_legend = {
14111	id: 'legend',
14112
14113	/**
14114	 * Backward compatibility: since 2.1.5, the legend is registered as a plugin, making
14115	 * Chart.Legend obsolete. To avoid a breaking change, we export the Legend as part of
14116	 * the plugin, which one will be re-exposed in the chart.js file.
14117	 * https://github.com/chartjs/Chart.js/pull/2640
14118	 * @private
14119	 */
14120	_element: Legend,
14121
14122	beforeInit: function(chart) {
14123		var legendOpts = chart.options.legend;
14124
14125		if (legendOpts) {
14126			createNewLegendAndAttach(chart, legendOpts);
14127		}
14128	},
14129
14130	beforeUpdate: function(chart) {
14131		var legendOpts = chart.options.legend;
14132		var legend = chart.legend;
14133
14134		if (legendOpts) {
14135			helpers$1.mergeIf(legendOpts, core_defaults.global.legend);
14136
14137			if (legend) {
14138				core_layouts.configure(chart, legend, legendOpts);
14139				legend.options = legendOpts;
14140			} else {
14141				createNewLegendAndAttach(chart, legendOpts);
14142			}
14143		} else if (legend) {
14144			core_layouts.removeBox(chart, legend);
14145			delete chart.legend;
14146		}
14147	},
14148
14149	afterEvent: function(chart, e) {
14150		var legend = chart.legend;
14151		if (legend) {
14152			legend.handleEvent(e);
14153		}
14154	}
14155};
14156
14157var noop$2 = helpers$1.noop;
14158
14159core_defaults._set('global', {
14160	title: {
14161		display: false,
14162		fontStyle: 'bold',
14163		fullWidth: true,
14164		padding: 10,
14165		position: 'top',
14166		text: '',
14167		weight: 2000         // by default greater than legend (1000) to be above
14168	}
14169});
14170
14171/**
14172 * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
14173 */
14174var Title = core_element.extend({
14175	initialize: function(config) {
14176		var me = this;
14177		helpers$1.extend(me, config);
14178
14179		// Contains hit boxes for each dataset (in dataset order)
14180		me.legendHitBoxes = [];
14181	},
14182
14183	// These methods are ordered by lifecycle. Utilities then follow.
14184
14185	beforeUpdate: noop$2,
14186	update: function(maxWidth, maxHeight, margins) {
14187		var me = this;
14188
14189		// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
14190		me.beforeUpdate();
14191
14192		// Absorb the master measurements
14193		me.maxWidth = maxWidth;
14194		me.maxHeight = maxHeight;
14195		me.margins = margins;
14196
14197		// Dimensions
14198		me.beforeSetDimensions();
14199		me.setDimensions();
14200		me.afterSetDimensions();
14201		// Labels
14202		me.beforeBuildLabels();
14203		me.buildLabels();
14204		me.afterBuildLabels();
14205
14206		// Fit
14207		me.beforeFit();
14208		me.fit();
14209		me.afterFit();
14210		//
14211		me.afterUpdate();
14212
14213		return me.minSize;
14214
14215	},
14216	afterUpdate: noop$2,
14217
14218	//
14219
14220	beforeSetDimensions: noop$2,
14221	setDimensions: function() {
14222		var me = this;
14223		// Set the unconstrained dimension before label rotation
14224		if (me.isHorizontal()) {
14225			// Reset position before calculating rotation
14226			me.width = me.maxWidth;
14227			me.left = 0;
14228			me.right = me.width;
14229		} else {
14230			me.height = me.maxHeight;
14231
14232			// Reset position before calculating rotation
14233			me.top = 0;
14234			me.bottom = me.height;
14235		}
14236
14237		// Reset padding
14238		me.paddingLeft = 0;
14239		me.paddingTop = 0;
14240		me.paddingRight = 0;
14241		me.paddingBottom = 0;
14242
14243		// Reset minSize
14244		me.minSize = {
14245			width: 0,
14246			height: 0
14247		};
14248	},
14249	afterSetDimensions: noop$2,
14250
14251	//
14252
14253	beforeBuildLabels: noop$2,
14254	buildLabels: noop$2,
14255	afterBuildLabels: noop$2,
14256
14257	//
14258
14259	beforeFit: noop$2,
14260	fit: function() {
14261		var me = this;
14262		var opts = me.options;
14263		var display = opts.display;
14264		var minSize = me.minSize;
14265		var lineCount = helpers$1.isArray(opts.text) ? opts.text.length : 1;
14266		var fontOpts = helpers$1.options._parseFont(opts);
14267		var textSize = display ? (lineCount * fontOpts.lineHeight) + (opts.padding * 2) : 0;
14268
14269		if (me.isHorizontal()) {
14270			minSize.width = me.maxWidth; // fill all the width
14271			minSize.height = textSize;
14272		} else {
14273			minSize.width = textSize;
14274			minSize.height = me.maxHeight; // fill all the height
14275		}
14276
14277		me.width = minSize.width;
14278		me.height = minSize.height;
14279
14280	},
14281	afterFit: noop$2,
14282
14283	// Shared Methods
14284	isHorizontal: function() {
14285		var pos = this.options.position;
14286		return pos === 'top' || pos === 'bottom';
14287	},
14288
14289	// Actually draw the title block on the canvas
14290	draw: function() {
14291		var me = this;
14292		var ctx = me.ctx;
14293		var opts = me.options;
14294
14295		if (opts.display) {
14296			var fontOpts = helpers$1.options._parseFont(opts);
14297			var lineHeight = fontOpts.lineHeight;
14298			var offset = lineHeight / 2 + opts.padding;
14299			var rotation = 0;
14300			var top = me.top;
14301			var left = me.left;
14302			var bottom = me.bottom;
14303			var right = me.right;
14304			var maxWidth, titleX, titleY;
14305
14306			ctx.fillStyle = helpers$1.valueOrDefault(opts.fontColor, core_defaults.global.defaultFontColor); // render in correct colour
14307			ctx.font = fontOpts.string;
14308
14309			// Horizontal
14310			if (me.isHorizontal()) {
14311				titleX = left + ((right - left) / 2); // midpoint of the width
14312				titleY = top + offset;
14313				maxWidth = right - left;
14314			} else {
14315				titleX = opts.position === 'left' ? left + offset : right - offset;
14316				titleY = top + ((bottom - top) / 2);
14317				maxWidth = bottom - top;
14318				rotation = Math.PI * (opts.position === 'left' ? -0.5 : 0.5);
14319			}
14320
14321			ctx.save();
14322			ctx.translate(titleX, titleY);
14323			ctx.rotate(rotation);
14324			ctx.textAlign = 'center';
14325			ctx.textBaseline = 'middle';
14326
14327			var text = opts.text;
14328			if (helpers$1.isArray(text)) {
14329				var y = 0;
14330				for (var i = 0; i < text.length; ++i) {
14331					ctx.fillText(text[i], 0, y, maxWidth);
14332					y += lineHeight;
14333				}
14334			} else {
14335				ctx.fillText(text, 0, 0, maxWidth);
14336			}
14337
14338			ctx.restore();
14339		}
14340	}
14341});
14342
14343function createNewTitleBlockAndAttach(chart, titleOpts) {
14344	var title = new Title({
14345		ctx: chart.ctx,
14346		options: titleOpts,
14347		chart: chart
14348	});
14349
14350	core_layouts.configure(chart, title, titleOpts);
14351	core_layouts.addBox(chart, title);
14352	chart.titleBlock = title;
14353}
14354
14355var plugin_title = {
14356	id: 'title',
14357
14358	/**
14359	 * Backward compatibility: since 2.1.5, the title is registered as a plugin, making
14360	 * Chart.Title obsolete. To avoid a breaking change, we export the Title as part of
14361	 * the plugin, which one will be re-exposed in the chart.js file.
14362	 * https://github.com/chartjs/Chart.js/pull/2640
14363	 * @private
14364	 */
14365	_element: Title,
14366
14367	beforeInit: function(chart) {
14368		var titleOpts = chart.options.title;
14369
14370		if (titleOpts) {
14371			createNewTitleBlockAndAttach(chart, titleOpts);
14372		}
14373	},
14374
14375	beforeUpdate: function(chart) {
14376		var titleOpts = chart.options.title;
14377		var titleBlock = chart.titleBlock;
14378
14379		if (titleOpts) {
14380			helpers$1.mergeIf(titleOpts, core_defaults.global.title);
14381
14382			if (titleBlock) {
14383				core_layouts.configure(chart, titleBlock, titleOpts);
14384				titleBlock.options = titleOpts;
14385			} else {
14386				createNewTitleBlockAndAttach(chart, titleOpts);
14387			}
14388		} else if (titleBlock) {
14389			core_layouts.removeBox(chart, titleBlock);
14390			delete chart.titleBlock;
14391		}
14392	}
14393};
14394
14395var plugins = {};
14396var filler = plugin_filler;
14397var legend = plugin_legend;
14398var title = plugin_title;
14399plugins.filler = filler;
14400plugins.legend = legend;
14401plugins.title = title;
14402
14403/**
14404 * @namespace Chart
14405 */
14406
14407
14408core_controller.helpers = helpers$1;
14409
14410// @todo dispatch these helpers into appropriated helpers/helpers.* file and write unit tests!
14411core_helpers(core_controller);
14412
14413core_controller._adapters = core_adapters;
14414core_controller.Animation = core_animation;
14415core_controller.animationService = core_animations;
14416core_controller.controllers = controllers;
14417core_controller.DatasetController = core_datasetController;
14418core_controller.defaults = core_defaults;
14419core_controller.Element = core_element;
14420core_controller.elements = elements;
14421core_controller.Interaction = core_interaction;
14422core_controller.layouts = core_layouts;
14423core_controller.platform = platform;
14424core_controller.plugins = core_plugins;
14425core_controller.Scale = core_scale;
14426core_controller.scaleService = core_scaleService;
14427core_controller.Ticks = core_ticks;
14428core_controller.Tooltip = core_tooltip;
14429
14430// Register built-in scales
14431
14432core_controller.helpers.each(scales, function(scale, type) {
14433	core_controller.scaleService.registerScaleType(type, scale, scale._defaults);
14434});
14435
14436// Load to register built-in adapters (as side effects)
14437
14438
14439// Loading built-in plugins
14440
14441for (var k in plugins) {
14442	if (plugins.hasOwnProperty(k)) {
14443		core_controller.plugins.register(plugins[k]);
14444	}
14445}
14446
14447core_controller.platform.initialize();
14448
14449var chart = core_controller;
14450if (typeof window !== 'undefined') {
14451	window.Chart = core_controller;
14452}
14453
14454// DEPRECATIONS
14455
14456/**
14457 * Provided for backward compatibility, not available anymore
14458 * @namespace Chart.Legend
14459 * @deprecated since version 2.1.5
14460 * @todo remove at version 3
14461 * @private
14462 */
14463core_controller.Legend = plugins.legend._element;
14464
14465/**
14466 * Provided for backward compatibility, not available anymore
14467 * @namespace Chart.Title
14468 * @deprecated since version 2.1.5
14469 * @todo remove at version 3
14470 * @private
14471 */
14472core_controller.Title = plugins.title._element;
14473
14474/**
14475 * Provided for backward compatibility, use Chart.plugins instead
14476 * @namespace Chart.pluginService
14477 * @deprecated since version 2.1.5
14478 * @todo remove at version 3
14479 * @private
14480 */
14481core_controller.pluginService = core_controller.plugins;
14482
14483/**
14484 * Provided for backward compatibility, inheriting from Chart.PlugingBase has no
14485 * effect, instead simply create/register plugins via plain JavaScript objects.
14486 * @interface Chart.PluginBase
14487 * @deprecated since version 2.5.0
14488 * @todo remove at version 3
14489 * @private
14490 */
14491core_controller.PluginBase = core_controller.Element.extend({});
14492
14493/**
14494 * Provided for backward compatibility, use Chart.helpers.canvas instead.
14495 * @namespace Chart.canvasHelpers
14496 * @deprecated since version 2.6.0
14497 * @todo remove at version 3
14498 * @private
14499 */
14500core_controller.canvasHelpers = core_controller.helpers.canvas;
14501
14502/**
14503 * Provided for backward compatibility, use Chart.layouts instead.
14504 * @namespace Chart.layoutService
14505 * @deprecated since version 2.7.3
14506 * @todo remove at version 3
14507 * @private
14508 */
14509core_controller.layoutService = core_controller.layouts;
14510
14511/**
14512 * Provided for backward compatibility, not available anymore.
14513 * @namespace Chart.LinearScaleBase
14514 * @deprecated since version 2.8
14515 * @todo remove at version 3
14516 * @private
14517 */
14518core_controller.LinearScaleBase = scale_linearbase;
14519
14520/**
14521 * Provided for backward compatibility, instead we should create a new Chart
14522 * by setting the type in the config (`new Chart(id, {type: '{chart-type}'}`).
14523 * @deprecated since version 2.8.0
14524 * @todo remove at version 3
14525 */
14526core_controller.helpers.each(
14527	[
14528		'Bar',
14529		'Bubble',
14530		'Doughnut',
14531		'Line',
14532		'PolarArea',
14533		'Radar',
14534		'Scatter'
14535	],
14536	function(klass) {
14537		core_controller[klass] = function(ctx, cfg) {
14538			return new core_controller(ctx, core_controller.helpers.merge(cfg || {}, {
14539				type: klass.charAt(0).toLowerCase() + klass.slice(1)
14540			}));
14541		};
14542	}
14543);
14544
14545return chart;
14546
14547})));