C++ 情怀游戏贪吃蛇的实现流程详解

typedef struct pointXY
{
	int x;
	int y;
}MYPOINT;
HWND hwnd = NULL;
 
//蛇
struct mySnake
{
	int num;
	MYPOINT xy[MAX];
	char postion;		//表示方向，标记
}snake;
 
//食物
struct myFood
{
	MYPOINT foodxy;
	int flag;
	int eatGrade;
}food;

//1.初始化蛇
void initSnake()
{
	snake.xy[2].x = 0;
	snake.xy[2].y = 0;
 
	snake.xy[1].x = 10;
	snake.xy[1].y = 0;
 
	snake.xy[0].x = 20;
	snake.xy[0].y = 0;
 
	snake.num = 3;
	snake.postion = right;
 
	food.flag = 0;
}
//2.绘制蛇
void drawSnake()
{
	for (int i = 0; i < snake.num; i++)
	{
		setlinecolor(RED);
		setfillcolor(GREEN);
		fillrectangle(snake.xy[i].x, snake.xy[i].y, snake.xy[i].x + 10, snake.xy[i].y + 10);
	}
}
//初始化食物
void  initFood()
{
	//0,63    630   640  
	//0,47    470   480
	food.foodxy.x = rand() % 64 * 10;  //只能是10的整数倍，蛇头才能对齐食物
	food.foodxy.y = rand() % 48 * 10;
	food.flag = 1;
	//食物不能出现在蛇身上
	for (int i = 0; i < snake.num; i++)
	{
		if (food.foodxy.x == snake.xy[i].x&&food.foodxy.y == snake.xy[i].y)
		{
			food.foodxy.x = rand() % 64 * 10;  //只能是10的整数倍，蛇头才能对齐食物
			food.foodxy.y = rand() % 48 * 10;
		}
	}
}
//绘制食物
void drawFood()
{
	fillrectangle(food.foodxy.x, food.foodxy.y, food.foodxy.x + 10, food.foodxy.y + 10);
}

//3.移动蛇
void moveSnake()
{
	//除了第一节之外，后面的坐标都是前一节坐标
	for (int i = snake.num - 1; i > 0; i--)
	{
		snake.xy[i].x = snake.xy[i - 1].x;
		snake.xy[i].y = snake.xy[i - 1].y;
	}
	//蛇头怎么走，要根据方向标志去做移动
	switch (snake.postion)
	{
	case right:
		snake.xy[0].x += 10;
		break;
	case left:
		snake.xy[0].x -= 10;
		break;
	case down:
		snake.xy[0].y += 10;
		break;
	case up:
		snake.xy[0].y -= 10;
		break;
	}
 
 
}

//4.按键用户：人玩蛇
void keyDown()
{
	static char userkey = '\0';    //VC  getch不需要加下划线
	//userkey=_getch();		//不可见输入
	//自己生成按键
	switch (snake.postion)
	{
	case right:
	case left:
		if (food.foodxy.y >= snake.xy[0].y)
		{
			userkey = 80;
		}
		else  if (food.foodxy.y<snake.xy[0].y)
		{
			userkey = 72;
		}
		break;
	case up:
	case down:
		if (food.foodxy.x >= snake.xy[0].x)
		{
			userkey = 77;
		}
		else  if (food.foodxy.x < snake.xy[0].x)
		{
			userkey = 75;
		}
		break;
	}
	switch (userkey)
	{
	case 'w':
	case 'W':
	case 72:	//上
		if (snake.postion != down)
		{
			//蛇往上走，你要排除掉蛇本来是朝下
			snake.postion = up;
		}
		break;
	case 's':
	case 'S':
	case 80:	//下
		if (snake.postion != up)
		{
			snake.postion = down;
		}
		break;
	case 'a':
	case 'A':
	case 75:	//左
		if (snake.postion != right)
		{
			snake.postion = left;
		}
		break;
	case 'd':
	case 'D':
	case 77:	//右
		if (snake.postion != left)
		{
			snake.postion = right;
		}
	}
}

//蛇吃食物
void eatFood()
{
	if (snake.xy[0].x == food.foodxy.x && snake.xy[0].y == food.foodxy.y)
	{
		snake.num++;
		food.eatGrade += 10;
		food.flag = 0;
	}
}
//蛇死亡判断
int snakeDie()
{
	//显示分数
	char grade[100] = { 0 };
	sprintf(grade, "%d", food.eatGrade);
	setbkmode(TRANSPARENT);
	settextcolor(RED);
	outtextxy(580, 20, "分数:");		//loadimage   
	outtextxy(620, 20, grade);		//
	//判断蛇是否死亡
 
	//撞墙
	if (snake.xy[0].x > 640 || snake.xy[0].x<0 || snake.xy[0].y>480 || snake.xy[0].y < 0)
	{
		MessageBox(hwnd, "游戏结束!", "撞墙死亡!", 0);
		return 1;
	}
	//撞自己
	for (int i = 1; i < snake.num; i++)
	{
		if (snake.xy[0].x == snake.xy[i].x&&snake.xy[0].y == snake.xy[i].y)
		{
			MessageBox(hwnd, "游戏结束!", "撞自己!", 0);
			return 1;
		}
	}
	return 0;
}

int main()
{
	srand((unsigned int)time(NULL));
	hwnd=initgraph(640, 480);
	setbkcolor(WHITE);
	cleardevice();
	initSnake();
	while (1)
	{
		cleardevice();		//刷掉路径
		if (food.flag == 0)
		{
			initFood();
		}
		drawFood();
		drawSnake();
		if (snakeDie())
		{
			break;
		}
		eatFood();
		moveSnake();
		Sleep(100);			//控制速度
		//while (_kbhit())	//kbhit() 存在按键操作，返回非零
		//{
		//	keyDown();
		//}
		keyDown();
	}
	closegraph();
	printf("GameOver!!!");
	system("pause");
	return 0;
}