2PCntE86

1#include <vector>
2#include <iostream>
3#include <conio.h>
4#include <cmath>
5#include <windows.h>
6#include <cstdlib>
7#include <ctime>
8#include <string>
9
10const int WIDTH = 40;
11const int HEIGHT = 20;
12const size_t MAX_SIZE = 1000;
13
14const int DELAY_MS = 800;
15enum MoveResult
16{
17    GotCollision = 2,
18    GotFruit = 1,
19    NothingHappens = 0
20};
21
22struct Point
23{
24    int x;
25    int y;
26};
27
28
29std::vector<Point> snake(MAX_SIZE);
30size_t head;
31size_t tail;
32
33Point direction;
34Point fruit;
35
36void GotoXY(const int y, const int x);
37void GotoXY(const Point& p);
38void PutCharAt(const int y, const int x, const int c);
39void PutCharAt(const Point& p, const int c);
40void Delay(const int t);
41int GetKey();
42void DrawBorders();
43bool PointOnSnake(const Point& p);
44void NextInSnake(size_t& idx);
45int Move(Point& p);
46void GenerateFruit(Point& fruit);
47void SetupDirectionFromKeyboard(Point& dir);
48void Init();
49void PlayGame();
50void GotoXY(const int y, const int x)
51{
52    
53    COORD position{static_cast<short int>(x), static_cast<short int>(y)};
54    HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
55    SetConsoleCursorPosition(hConsole, position);
56}
57
58void GotoXY(const Point& p)
59{
60    GotoXY(p.y, p.x);
61}
62
63void PutCharAt(const int y, const int x, const int c)
64{
65    GotoXY(y, x);
66    putch(c);
67}
68
69void PutCharAt(const Point& p, const int c)
70{
71    PutCharAt(p.y, p.x, c);
72}
73
74void Delay(int t)
75{
76    // тоже windows API
77    Sleep(100);
78}
79
80int GetKey()
81{
82    
83    if (kbhit())
84        return getch();
85    return 0;
86}
87
88void DrawBorders()
89{
90    
91    for (int i = 0; i < WIDTH; ++i)
92    {
93        PutCharAt(0, i, '#');
94        PutCharAt(HEIGHT - 1, i, '#');
95    }
96    
97    for (int i = 0; i < HEIGHT; ++i)
98    {
99        PutCharAt(i, 0, '#');
100        PutCharAt(i, WIDTH - 1, '#');
101    }
102}
103
104void NextInSnake(size_t& idx)
105{
106    
107    idx = (idx + 1) % snake.size();
108}
109
110bool PointOnSnake(const Point& p)
111{
112    
113    
114    size_t e = head;
115    NextInSnake(e);
116    
117    for (size_t t = tail; t != e; NextInSnake(t))
118    {
119        if (snake[t].x == p.x && snake[t].y == p.y)
120            return true;
121    }
122    return false;
123}
124
125int Move(Point& p)
126{
127    
128    p.x += direction.x;
129    p.y += direction.y;
130    
131    p.x = (p.x - 1 + (WIDTH - 2)) % (WIDTH - 2) + 1;
132    p.y = (p.y - 1 + (HEIGHT - 2)) % (HEIGHT - 2) + 1;
133    if (fruit.x == p.x && fruit.y == p.y)
134        return MoveResult::GotFruit;
135    if (PointOnSnake(p))
136        return MoveResult::GotCollision;
137    if (p.x == 0 || p.x == WIDTH - 1 || p.y == 0 || p.y == HEIGHT - 1)
138        return MoveResult::GotCollision;
139    return MoveResult::NothingHappens;
140}
141
142void GenerateFruit(Point& fruit)
143{
144    fruit.x = 1 + rand() % (WIDTH - 2);
145    fruit.y = 1 + rand() % (HEIGHT - 2);
146    PutCharAt(fruit, '$');
147}
148
149void SetupDirectionFromKeyboard(Point& dir)
150{
151    switch (GetKey())
152    {
153    case 'w':
154    case 'W':
155        dir = Point{0, -1};
156        break;
157    case 's':
158    case 'S':
159        dir = Point{0, 1};
160        break;
161    case 'd':
162    case 'D':
163        dir = Point{1, 0};
164        break;
165    case 'a':
166    case 'A':
167        dir = Point{-1, 0};
168        break;
169    }
170}
171
172
173void TextGameOver()
174{
175    system("cls");
176    int HEIGHT = 30;
177    int WIDH = 60;
178    GotoXY(HEIGHT / 2, (WIDTH - 10) / 2);
179    std::cout << "Game Over";
180}
181
182
183
184void INTRO()
185{
186    system("cls");
187    int HEIGHT = 30;
188    int WIDH = 60;
189    GotoXY(HEIGHT / 2, (WIDTH - 6) / 2);
190    std::cout << "SNAKE";
191}
192
193
194
195void Init()
196{
197    tail = head = 0;
198    snake[head] = Point{5, 5};
199    direction = Point{1, 0};
200    GenerateFruit(fruit);
201    DrawBorders();
202}
203
204void PlayGame()
205{
206    
207    while (true)
208    {
209        SetupDirectionFromKeyboard(direction);
210        Delay(DELAY_MS);
211        Point p = snake[head];
212        PutCharAt(p, 'o');
213                              
214        int moveResult = Move(p);
215        if (moveResult == MoveResult::GotCollision)
216        {
217            TextGameOver();
218            break;
219        }
220        NextInSnake(head);
221        snake[head] = p;
222        PutCharAt(p, 'O');
223        if (moveResult == MoveResult::NothingHappens)
224        {
225            PutCharAt(snake[tail], ' ');
226            NextInSnake(tail);
227        }
228        if (moveResult == MoveResult::GotFruit)
229        {
230            GenerateFruit(fruit);
231        }
232    }
233}
234
235
236void Test()
237{
238    int count = 100;
239    for (int second = 0; second < count; second++){
240        Delay(100);
241        GotoXY(0, 0);
242        puts("    ");
243        GotoXY(0, 0);
244        std::cout << second;
245        GotoXY(1, 0);
246        int key = GetKey();
247        if (key > 0)
248        {
249            GotoXY(2, 0);
250            std::cout << "Key code " << key << "was pressed.     ";
251        }
252        else
253        {
254            std::cout << "No key was pressed       ";
255        }
256    }
257}
258
259
260int main()
261{
262    Init();
263    PlayGame();
264    return 0;
265}