C/C++小游戏，贪吃蛇

游戏效果图

源代码

#include <stdio.h>
#include <graphics.h>        
#include <easyx.h>
#include <conio.h>

/*
贪吃蛇，小游戏
*/

#define HEIGHT  480
#define WIDTH 640
#define SNAKE_SIZE  500        //蛇的最大节数
#define DEFAULT_LOW_SPEED 5    //

enum Direction { LEFT, RIGHT, UP, DOWN }; //方向枚举
Direction snake_direction = RIGHT;//默认蛇向右移动

//定义蛇的结构
struct Snake {
    int size;                //初始节数
    int speed;                //蛇的速度
    Direction direction;    //蛇的方向
    POINT coor[SNAKE_SIZE];    //蛇的坐标
} snake;

//食物结构属性
struct Food
{
    int x;
    int y;
    int radius;    //食物半径
    bool flag;    //标记是否被吃
    DWORD color;    //食物颜色
}food;

void game_init() {
    snake.size = 3;
    snake.speed = 10;
    snake.direction = snake_direction;
    for (int i = 0; i < snake.size; i++) {
        snake.coor[i].x = 40 - i * snake.speed;
        snake.coor[i].y = 10;

    }
    //初始化窗口
    initgraph(WIDTH, HEIGHT);

    //设置随机数种子
    srand(GetTickCount());
    //初始化食物
    food.x = rand() % WIDTH;
    food.y = rand() % HEIGHT;
    food.color = RGB(rand() % 256, rand() % 256, rand() % 256);
    food.radius = rand() % 10 + 5;
    food.flag = true;
}

void snake_move() {

    //记录移动前的坐标 
    for (int i = snake.size - 1; i > 0; i--) {
        snake.coor[i] = snake.coor[i - 1];
    }

    switch (snake.direction)
    {
    case UP:
        snake.coor[0].y -= snake.speed;
        if (snake.coor[0].y + 10 <= 0) {
            snake.coor[0].y = HEIGHT;
        }
        break;

    case DOWN:
        snake.coor[0].y += snake.speed;
        if (snake.coor[0].y - 10 >= HEIGHT) {
            snake.coor[0].y = 0;
        }
        break;

    case RIGHT:

        snake.coor[0].x += snake.speed;
        if (snake.coor[0].x + 10 >= WIDTH) {
            snake.coor[0].x = 0;
        }
        break;
    case LEFT:
        snake.coor[0].x -= snake.speed;
        if (snake.coor[0].x - 10 <= 0) {
            snake.coor[0].x = WIDTH;
        }
        break;
    }
}

void key_control() {

    //_kbhit() ,非阻塞监听键盘按键，有按下返回真 
    if (_kbhit()) {
        //72 80 75 77 上下左右方向键码

        int keycode = _getch(); switch (keycode)
        {

        case 'w':
        case 'W':
        case 72:
            if (snake.direction != DOWN)
                snake.direction = UP;
            break;

        case 's':
        case 'S':
        case 80:

            if (snake.direction != UP)
                snake.direction = DOWN;
            break;

        case 'a':
        case 'A':
        case 75:

            if (snake.direction != RIGHT)
                snake.direction = LEFT;
            break;

        case 'd':
        case 'D':
        case 77:

            if (snake.direction != LEFT)
                snake.direction = RIGHT;
            break;
            //小键盘＋- 调节蛇的速度 + = 107, - = 109

        case 45:
            snake.speed++;
            break;
        case 43:
            if (snake.speed > DEFAULT_LOW_SPEED) {
                snake.speed++;
            }
            break;
            //空格键 32  暂停控制
        case 32:
            while (true)
            {
                 keycode = _getch();
                if (keycode == 32) {
                    break;
                }
            }
            break;
        }

    }
}

void game_draw() {
    BeginBatchDraw();                    //双缓冲绘图
    setbkcolor(RGB(192, 192, 192));        //设置背景颜色
    cleardevice();                        //清空设备上下文
    setfillcolor(RGB(128, 42, 42));
    //绘制蛇
    for (int i = 0; i < snake.size; i++) {
        solidcircle(snake.coor[i].x, snake.coor[i].y, 5);
    }
    //绘制食物
    if (food.flag) {
        solidcircle(food.x, food.y, food.radius);
    }
    EndBatchDraw();
}

void eat_food() {
    int moveX = abs(snake.coor[0].x - food.x);
    int moveY = abs(snake.coor[0].y - food.y);
    if (food.flag && moveX < food.radius && moveY < food.radius) {
        food.flag = false;
        snake.size++;
    }
    if (!food.flag) {
        food.x = rand() % WIDTH;
        food.y = rand() % HEIGHT;
        food.color = RGB(rand() % 256, rand() % 256, rand() % 256);
        food.radius = rand() % 10 + 5;
        food.flag = true;
    }
}
int main() {
    game_init();


    while (1) {
         
        game_draw();
        snake_move();
        key_control();
        eat_food();
        Sleep(100);
    }
    return 0;
}