C++贪吃蛇游戏

自学C++,勉强实现了初步功能

正在学习中

#include<stdio.h>
#include<graphics.h>
#include<conio.h>
#define WIN_WIDTH  640  //窗口宽度
#define WIN_HEIGHT 480  //窗口高度
#define MAX_SNAKE  100   //蛇的最大长度
bool isGameRunning = true;
bool IsKeyDown(int key)
{
    return (GetAsyncKeyState(key) & 0x8000 ? 1 : 0);
}


enum Direction    //蛇的方向
{
    Up,
    Down,
    Left,
    Right,
};


void KeyboardControl()
{
    if (IsKeyDown(VK_ESCAPE)) // esc键按下则退出循环结束游戏
    {
        isGameRunning = false;
        return;
    }
}
struct Snake_flg   //定义蛇的属性结构
{
    int num; //蛇的长度
    int dir;  //蛇的方向
    int scor;   //分数
    int size;
    POINT coor[MAX_SNAKE];
}snake;

struct Food_flg   //定义蛇的食物
{
    POINT sit;
    int flge;
    DWORD color;
}food;

void GameInit()
{   
    srand(GetTickCount());
    //初始化蛇
    snake.num = 3;
    snake.dir = Right;
    snake.scor = 0;
    snake.size = 10;
    snake.coor[2].x = 0;
    snake.coor[2].y = 0;
    snake.coor[1].x = 0 + snake.size;
    snake.coor[1].y = 0;
    snake.coor[0].x = 2 * snake.size;;
    snake.coor[0].y = 0;
    //初始化食物
    food.sit.x = rand() % (WIN_WIDTH/10)*10;
    food.sit.y = rand() % (WIN_HEIGHT/10)*10;
    food.flge = 1;
    food.color = RGB(rand() % 256, rand() % 256, rand() % 256);

}

void GameDraw()
{
    setbkcolor(RGB(192, 192, 192));  //设置背景颜色
    cleardevice();
    /*画蛇*/
    setfillcolor(RGB(255, 128, 0));
    for (int i = 0; i < snake.num; i++)
    {    
        setlinecolor(BLACK);
        solidrectangle(snake.coor[i].x, snake.coor[i].y, snake.coor[i].x + snake.size, snake.coor[i].y + snake.size);
        printf("%d%d
", snake.coor[i].x, snake.coor[i].y);
    }
    /*画食物*/
    if (food.flge == 1)
    {
        setfillcolor(food.color);
        fillellipse(food.sit.x, food.sit.y, food.sit.x + 10, food.sit.y + 10);
    }
    
    /*显示分数*/
    
    char temp[20] = "";
    sprintf(temp, "分数:%d", snake.scor);
    //setbkmode(TRANSPARENT);
    outtextxy(20, 20, temp);
    

}

void SnakeMOVE()
{
    for (int i = snake.num - 1; i > 0; i--)  //从最后一节蛇开始，每一节都等于上一节蛇的上一次坐标位置
    {
        snake.coor[i].x = snake.coor[i - 1].x;
        snake.coor[i].y = snake.coor[i - 1].y;
    }

    switch (snake.dir)
    {
    case Up:
        snake.coor[0].y -= 10;
        if (snake.coor[0].y <= 0)
        {
            snake.coor[0].y = WIN_HEIGHT;
        }
        break;
    case Down:
        snake.coor[0].y += 10;
        if (snake.coor[0].y >= 480)
        {
            snake.coor[0].y = 0;
        }
        break;
    case Left:
        snake.coor[0].x -= 10;
        if (snake.coor[0].x <= 0)
        {
            snake.coor[0].x = WIN_WIDTH;
        }
        break;
    case Right:
        snake.coor[0].x += 10;
        if (snake.coor[0].x >= WIN_WIDTH)
        {
            snake.coor[0].x = 0;
        }
        break;
    default:
        break;
    }
}

void KeyControl()
{
    /*使用win32的API来获取键盘信息*/
    if (GetAsyncKeyState(VK_UP) && snake.dir != Down)
    {
        snake.dir = Up;
    }
    if (GetAsyncKeyState(VK_DOWN) && snake.dir != Up)
    {
        snake.dir = Down;
    }
    if (GetAsyncKeyState(VK_LEFT) && snake.dir != Right)
    {
        snake.dir = Left;
    }
    if (GetAsyncKeyState(VK_RIGHT) && snake.dir != Left)
    {
        snake.dir = Right; 
        snake.coor[0].x += 10;
    }
}

void EatFood()
{
    if (snake.coor[0].x == food.sit.x && snake.coor[0].y == food.sit.y && food.flge ==1)
    {
        snake.num ++;
        snake.scor += 10;
        food.flge = 0;
    }

    if (food.flge == 0)
    {
        food.sit.x = rand() % (WIN_WIDTH / 10) * 10;
        food.sit.y = rand() % (WIN_HEIGHT / 10) * 10;
        food.flge = 1;
        food.color = RGB(rand() % 256, rand() % 256, rand() % 256);

    }
}
void Died()
{
    for (int i = 2; i < snake.num; i++)
    {
        if (snake.coor[0].x == snake.coor[i].x && snake.coor[0].y == snake.coor[i].y)
        {
            outtextxy(320, 240, "Game Over!  Please go to study");
            _getch();
            exit(233333333);
        }
    }
}

int main()
{
    initgraph(WIN_WIDTH, WIN_HEIGHT, SHOWCONSOLE);  // 初始化一个图形窗口

    GameInit();
    while (isGameRunning)
    {
        KeyboardControl(); // 处理键盘操作
        
        SnakeMOVE();
        KeyControl();
        GameDraw();                  // 处理所有绘制
        EatFood();
        Died();
        Sleep(100);                // 等待30毫秒，控制帧率
    }
    closegraph();
    return 0;
}