C语言贪吃蛇游戏

/*
	项目名称：贪吃蛇
	作者：	  微凉秋意
	开发环境：VS2022+easyx
*/
#include<time.h>		 //辅助生成随机数种子
#include<stdio.h>		 //C语言标准输入输出库
#include<conio.h>		 //键盘输入
#include<graphics.h>	//easyx图像库，提供函数，绘图和贴图
#define MAX_SNAKE 500	//蛇的最大节数
#define WIN_WIDTH 640	//游戏窗口的宽度
#define WIN_HEIGHT 480  //游戏窗口的高度

//枚举
enum Dir
{
	//枚举，从上往下代表0，1，2，3
	UP,
	DOWN,
	LEFT,
	RIGHT
};
//食物结构体
struct Food
{
	int x;
	int y;
	DWORD color;
	bool flag;	//是否被吃掉，决定是否重新生成
}food;
//蛇每个节点的位置和颜色
struct P 
{
	int x;
	int y;
	DWORD color;//DWORD是数据类型，可包含字符串
};
//设计蛇的结构体
struct Snake         
{
	int num;	//当前节数
	int dir;	//方向
	int score;	//得分
	int size;	//蛇的宽和高
	int speed;	//移动速度
	struct P coor[MAX_SNAKE]; //表示每节蛇的坐标,数组表示
}snake;
//初始化游戏函数
void GameInit()
{
	//设置随机数种子
	srand((unsigned int)time(NULL));
	snake.num = 3;
	snake.dir = RIGHT;//初识移动方向为右
	snake.score = 0;
	snake.size = 10;
	snake.speed = 10;
	//初始化蛇有三个节点
	snake.coor[0].x = 320;
	snake.coor[0].y = 240;
	snake.coor[0].color = (RGB(rand()%256, rand() % 256, rand() % 256));//随机生成颜色
	snake.coor[1].x = 310;
	snake.coor[1].y = 240;
	snake.coor[1].color = (RGB(rand()%256, rand() % 256, rand() % 256));//随机生成颜色
	snake.coor[2].x = 300;
	snake.coor[2].y = 240;
	snake.coor[2].color = (RGB(rand()%256, rand() % 256, rand() % 256));//随机生成颜色
	//初始化食物
	food.x = rand() % (WIN_WIDTH/10)*10;//这样写的目的是让食物坐标为10的倍数
	food.y = rand() % (WIN_HEIGHT/10)*10;
	food.color = RGB(rand() % 256, rand() % 256, rand() % 256);//随机生成食物颜色
	food.flag = true;
}
//绘制游戏所需资源
void DrawGame()
{
	cleardevice();//刷新窗口
	//绘制蛇
	for (int i = 0; i < snake.num; i++) {
		//设置图形填充颜色
		setfillcolor(snake.coor[i].color);
		//画矩形
		fillrectangle(snake.coor[i].x, snake.coor[i].y, snake.coor[i].x + 10, snake.coor[i].y+10);
	}
	//绘制食物(椭圆)
	if (food.flag) {
		setfillcolor(food.color);
		solidellipse(food.x, food.y, food.x + 10, food.y + 10);
	}
	//绘制分数
	char temp[20] = " ";
	sprintf(temp, "分数：%d", snake.score);
	outtextxy(10, 10, temp);//报错的话是因为字符集问题
	/*解决方案如下:
	* 1、打开项目属性，把常规改为多字节
	* 2、打开项目属性，C/C++常规设置里把SDL检查关掉
	*/
}
//蛇移动
void MoveSnake()
{
	//从尾部开始移动
	for (int i =snake.num-1 ;i > 0;i--) {
		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 -= snake.speed;
		if (snake.coor[0].y < 0) {
			snake.coor[0].y = WIN_HEIGHT;
		}
		break;
	case DOWN:
		snake.coor[0].y += snake.speed;
		if (snake.coor[0].y > WIN_HEIGHT) {
			snake.coor[0].y = 0;
		}
		break;
	case LEFT:
		snake.coor[0].x -= snake.speed;
		if (snake.coor[0].x < 0) {
			snake.coor[0].x = WIN_WIDTH;
		}
		break;
	case RIGHT:
		snake.coor[0].x += snake.speed;
		if (snake.coor[0].x > WIN_WIDTH) {
			snake.coor[0].x = 0;
		}
		break;
	}
}
void GameControl()
{
	//获取键盘输入，_getch();不回显函数：
	char key = _getch();
	
	switch (key)
	{
	//72代表上，80代表下，75代表左，77代表右
	case 72:
		if (snake.dir!=DOWN)//如果正在往下，则不能掉头往上
		{
			snake.dir = UP;
		}
		break;
	case 80:
		if (snake.dir != UP)//如果正在往上，则不能掉头往下
		{
			snake.dir = DOWN;
		}
		break;
	case 75:
		if (snake.dir !=RIGHT)//如果正在往右，则不能掉头往左
		{
			snake.dir = LEFT;
		}
		break;
	case 77:
		if (snake.dir != LEFT)//如果正在往左，则不能掉头往右
		{
			snake.dir = RIGHT;
		}
		break;
	}
}
//吃食物
void CreatFood()
{
	if (!food.flag) {
		food.x = rand() % (WIN_WIDTH / 10) * 10;//这样写的目的是让食物坐标为10的倍数
		food.y = rand() % (WIN_HEIGHT / 10) * 10;
		food.color = RGB(rand() % 256, rand() % 256, rand() % 256);//随机生成食物颜色
		food.flag = true;
	}
}
void EatFood()
{
	//食物存在且坐标对应,吃掉后节数加一，食物变为不存在
	if (food.flag && snake.coor[0].x == food.x && snake.coor[0].y == food.y)
	{
		food.flag = false;
		snake.num++;
		snake.score += 10;
		snake.coor[snake.num].color = food.color;
		CreatFood();
	}
}
int main(void)
{
	//1.创建窗口，initgraoh初始化 graphics 图形窗口
	initgraph(WIN_WIDTH,WIN_HEIGHT);
	setbkcolor(RGB(190,190,190));//设置颜色
	cleardevice();				 //刷新窗口
	GameInit();				     //调用初始化

	while (1)
	{
		DrawGame();
		MoveSnake();
		if (_kbhit()) {
			//_kbhit检测是否有键盘输入
			GameControl();
		}
		EatFood();
		Sleep(75);
	} 
	getchar();//防止闪退
	return 0;
}