给一份贪吃蛇C++代码

以下是一份简单的贪吃蛇C代码：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <conio.h>
#include <windows.h>

#define WIDTH  40
#define HEIGHT 20
#define SNAKE_LENGTH 50

int head_x, head_y; // 贪吃蛇头的位置
int body_x[SNAKE_LENGTH], body_y[SNAKE_LENGTH]; // 贪吃蛇身体的位置
int body_length; // 贪吃蛇身体的长度
int food_x, food_y; // 食物的位置

void draw_border(); // 画边界
void draw_food(); // 画食物
void draw_snake(); // 画贪吃蛇
void generate_food(); // 生成食物
void move_snake(); // 移动贪吃蛇
int check_collision(); // 检查碰撞

int main()
{
    srand(time(NULL)); // 初始化随机种子
    head_x = WIDTH / 2;
    head_y = HEIGHT / 2;
    body_length = 1;
    body_x[0] = head_x;
    body_y[0] = head_y;
    generate_food();

    while (1)
    {
        draw_border();
        draw_food();
        draw_snake();
        move_snake();
        if (check_collision())
        {
            printf("Game over.\n");
            break;
        }
        Sleep(100);
    }

    return 0;
}

void draw_border()
{
    system("cls");
    for (int i = 0; i < WIDTH + 2; i++)
        printf("#");
    printf("\n");
    for (int i = 0; i < HEIGHT; i++)
    {
        printf("#");
        for (int j = 0; j < WIDTH; j++)
            printf(" ");
        printf("#\n");
    }
    for (int i = 0; i < WIDTH + 2; i++)
        printf("#");
    printf("\n");
}

void draw_food()
{
    printf("\033[%d;%dH$", food_y + 1, food_x + 1);
}

void draw_snake()
{
    printf("\033[%d;%dH@", head_y + 1, head_x + 1);
    for (int i = 0; i < body_length; i++)
        printf("\033[%d;%dH*", body_y[i] + 1, body_x[i] + 1);
}

void generate_food()
{
    while (1)
    {
        food_x = rand() % WIDTH;
        food_y = rand() % HEIGHT;
        if (food_x != head_x || food_y != head_y)
        {
            int found = 0;
            for (int i = 0; i < body_length; i++)
            {
                if (food_x == body_x[i] && food_y == body_y[i])
                {
                    found = 1;
                    break;
                }
            }
            if (!found)
                break;
        }
    }
}

void move_snake()
{
    int dx = 0, dy = 0;
    if (_kbhit())
    {
        int c = _getch();
        switch (c)
        {
            case 'w':
            case 'W':
                dy = -1;
                break;
            case 's':
            case 'S':
                dy = 1;
                break;
            case 'a':
            case 'A':
                dx = -1;
                break;
            case 'd':
            case 'D':
                dx = 1;
                break;
        }
    }

    int prev_x = head_x, prev_y = head_y;
    head_x += dx;
    head_y += dy;
    if (head_x < 0)
        head_x = WIDTH - 1;
    else if (head_x >= WIDTH)
        head_x = 0;
    if (head_y < 0)
        head_y = HEIGHT - 1;
    else if (head_y >= HEIGHT)
        head_y = 0;

    if (head_x == food_x && head_y == food_y)
    {
        body_length++;
        body_x[body_length - 1] = prev_x;
        body_y[body_length - 1] = prev_y;
        generate_food();
    }

    for (int i = body_length - 1; i > 0; i--)
    {
        body_x[i] = body_x[i - 1];
        body_y[i] = body_y[i - 1];
    }
    body_x[0] = prev_x;
    body_y[0] = prev_y;
}

int check_collision()
{
    for (int i = 0; i < body_length; i++)
    {
        if (head_x == body_x[i] && head_y == body_y[i])
            return 1;
    }
    return 0;
}