用easyx写一个贪吃蛇游戏

好的，以下是使用EasyX库实现贪吃蛇游戏的示例代码：

#include <graphics.h>
#include <conio.h>
#include <time.h>
#include <stdlib.h>

#define MAX_LENGTH 100 // 贪吃蛇最大长度
#define BLOCK_SIZE 20 // 每个方块的大小
#define WIDTH 800 // 窗口宽度
#define HEIGHT 600 // 窗口高度

// 方向枚举
enum Direction {
    UP,
    DOWN,
    LEFT,
    RIGHT
};

// 食物结构体
struct Food {
    int x; // x轴坐标
    int y; // y轴坐标
};

// 贪吃蛇结构体
struct Snake {
    int length; // 长度
    int x[MAX_LENGTH]; // x轴坐标数组
    int y[MAX_LENGTH]; // y轴坐标数组
    Direction direction; // 当前方向
};

// 初始化贪吃蛇
void initSnake(Snake &snake) {
    snake.length = 3;
    snake.x[0] = BLOCK_SIZE * 5;
    snake.y[0] = BLOCK_SIZE * 5;
    snake.x[1] = BLOCK_SIZE * 4;
    snake.y[1] = BLOCK_SIZE * 5;
    snake.x[2] = BLOCK_SIZE * 3;
    snake.y[2] = BLOCK_SIZE * 5;
    snake.direction = RIGHT;
}

// 初始化食物
void initFood(Food &food) {
    srand((unsigned)time(NULL));
    food.x = (rand() % (WIDTH / BLOCK_SIZE)) * BLOCK_SIZE;
    food.y = (rand() % (HEIGHT / BLOCK_SIZE)) * BLOCK_SIZE;
}

// 绘制方块
void drawBlock(int x, int y, COLORREF color) {
    setfillcolor(color);
    setlinecolor(RGB(255, 255, 255));
    fillrectangle(x, y, x + BLOCK_SIZE, y + BLOCK_SIZE);
}

// 绘制贪吃蛇
void drawSnake(Snake &snake) {
    for (int i = 0; i < snake.length; i++) {
        drawBlock(snake.x[i], snake.y[i], RGB(0, 255, 0));
    }
}

// 绘制食物
void drawFood(Food &food) {
    drawBlock(food.x, food.y, RGB(255, 0, 0));
}

// 贪吃蛇移动
void moveSnake(Snake &snake) {
    for (int i = snake.length - 1; i > 0; i--) {
        snake.x[i] = snake.x[i - 1];
        snake.y[i] = snake.y[i - 1];
    }
    switch (snake.direction) {
    case UP:
        snake.y[0] -= BLOCK_SIZE;
        break;
    case DOWN:
        snake.y[0] += BLOCK_SIZE;
        break;
    case LEFT:
        snake.x[0] -= BLOCK_SIZE;
        break;
    case RIGHT:
        snake.x[0] += BLOCK_SIZE;
        break;
    }
}

// 判断贪吃蛇是否吃到食物
bool isEatFood(Snake &snake, Food &food) {
    return snake.x[0] == food.x && snake.y[0] == food.y;
}

// 判断贪吃蛇是否撞墙或自撞
bool isGameOver(Snake &snake) {
    if (snake.x[0] < 0 || snake.x[0] >= WIDTH || snake.y[0] < 0 || snake.y[0] >= HEIGHT) {
        return true;
    }
    for (int i = 1; i < snake.length; i++) {
        if (snake.x[i] == snake.x[0] && snake.y[i] == snake.y[0]) {
            return true;
        }
    }
    return false;
}

int main() {
    // 初始化窗口
    initgraph(WIDTH, HEIGHT);
    setbkcolor(RGB(255, 255, 255));

    // 初始化贪吃蛇和食物
    Snake snake;
    Food food;
    initSnake(snake);
    initFood(food);

    // 游戏循环
    while (true) {
        // 绘制贪吃蛇和食物
        cleardevice();
        drawSnake(snake);
        drawFood(food);

        // 贪吃蛇移动
        moveSnake(snake);

        // 判断是否吃到食物
        if (isEatFood(snake, food)) {
            snake.length++;
            initFood(food);
        }

        // 判断游戏是否结束
        if (isGameOver(snake)) {
            MessageBox(NULL, _T("游戏结束！"), _T("提示"), MB_OK);
            break;
        }

        // 监听键盘方向键
        if (_kbhit()) {
            switch (_getch()) {
            case 'w':
            case 'W':
            case VK_UP:
                if (snake.direction != DOWN) {
                    snake.direction = UP;
                }
                break;
            case 's':
            case 'S':
            case VK_DOWN:
                if (snake.direction != UP) {
                    snake.direction = DOWN;
                }
                break;
            case 'a':
            case 'A':
            case VK_LEFT:
                if (snake.direction != RIGHT) {
                    snake.direction = LEFT;
                }
                break;
            case 'd':
            case 'D':
            case VK_RIGHT:
                if (snake.direction != LEFT) {
                    snake.direction = RIGHT;
                }
                break;
            }
        }

        // 刷新画面
        Sleep(100);
    }

    // 关闭窗口
    closegraph();

    return 0;
}

运行示意图如下：