自己寫的貪喫蛇

#include<Windows.h>
#include<stdio.h>
#include<time.h>
const UINT WM_RESTART=WM_USER+100;
const int M(1),Max_Len(30),MaxN(100),size(20),Time(1000);
POINT pt[Max_Len],food;
char used[MaxN][MaxN];
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int nCmdShow)
{
	srand(time(NULL));
	static TCHAR szAppName[]=TEXT("Snake");
	HWND hwnd;
	MSG msg;
	WNDCLASS wndclass;
	wndclass.cbClsExtra=0;
	wndclass.cbWndExtra=0;
	wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
	wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
	wndclass.hInstance=hInstance;
	wndclass.lpfnWndProc=WndProc;
	wndclass.lpszClassName=szAppName;
	wndclass.lpszMenuName=NULL;
	wndclass.style=CS_HREDRAW|CS_VREDRAW;
	RegisterClass(&wndclass);
	hwnd=CreateWindow(szAppName,
		TEXT("Snake"),
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		NULL,
		NULL,
		hInstance,
		NULL);
	ShowWindow(hwnd,nCmdShow);
	UpdateWindow(hwnd);
	while(GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.lParam;
}
POINT randFood(int Max_x,int Max_y)
{
	POINT p;
	do
	{
		p.x=rand()%(Max_x)+1;
		p.y=rand()%(Max_y)+1;
	}while(used[p.x][p.y]);
	used[p.x][p.y]=2;
	return p;
}
void restart(HWND hwnd,int &Length,BOOL &bStart,POINT &food,int Max_x,int Max_y,POINT pt[],UINT &Next)
{
	Next=VK_RIGHT;
	bStart=0;
	Length=1;
	memset(used,0,sizeof(used));
	used[1][1]=1;
	food=randFood(Max_x,Max_y);
	used[food.x][food.y]=2;
	pt[0].x=pt[0].y=size;
	SetTimer(hwnd,M,Time+10,NULL);
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
	static int xCount,yCount,hight,width;
	static int Length(1);
	static UINT Next(VK_RIGHT);
	static BOOL bStart(0),bWin(0);
	HDC hdc;
	PAINTSTRUCT ps;
//	HPEN hPen=CreatePen(PS_INSIDEFRAME,2,RGB(0,0,255));
	HBRUSH hBrush=(HBRUSH)GetStockObject(BLACK_BRUSH);
	HBRUSH hBrush2=(HBRUSH)GetStockObject(GRAY_BRUSH);
	switch(message)
	{
	case WM_TIMER:
		if(bStart)
			SendMessage(hwnd,WM_KEYDOWN,Next,0);
		break;
	case WM_SIZE:
		hight=HIWORD(lParam);
		width=LOWORD(lParam);
		xCount=width/size;
		yCount=hight/size;
		if(xCount==0||yCount==0)
			bStart=false;
		else
		restart(hwnd,Length,bStart,food,xCount,yCount,pt,Next);
		break;
	case WM_PAINT:
		hdc=BeginPaint(hwnd,&ps);
		SelectObject(hdc,hBrush);
		for(int i=0;i<=width;i+=size)
		{
			MoveToEx(hdc,i,0,NULL);
			LineTo(hdc,i,yCount*size);
		}
		for(int j=0;j<=hight;j+=size)
		{
			MoveToEx(hdc,0,j,NULL);
			LineTo(hdc,xCount*size,j);
		}
		for(int i=0;i<Length;i++)
		Rectangle(hdc,pt[i].x-size,pt[i].y-size,pt[i].x,pt[i].y);
		DeleteObject(hBrush);
		SelectObject(hdc,hBrush2);
		Rectangle(hdc,(food.x-1)*size,(food.y-1)*size,food.x*size,food.y*size);
		DeleteObject(hBrush2);
		EndPaint(hwnd,&ps);
		break;
	case WM_KEYDOWN:
		{
		int x,y;
		switch(wParam)
		{
			case VK_UP:
				if(Next==VK_DOWN)
				{
					SendMessage(hwnd,WM_RESTART,0,0);
					return 0;
				}
				y=pt[Length-1].y-size;
				x=pt[Length-1].x;
				break;
			case VK_DOWN:
				if(Next==VK_UP)
				{
					SendMessage(hwnd,WM_RESTART,0,0);
					return 0;
				}
				y=pt[Length-1].y+size;
				x=pt[Length-1].x;
				break;
			case VK_LEFT:
				if(Next==VK_RIGHT)
				{
					SendMessage(hwnd,WM_RESTART,0,0);
					return 0;
				}
				y=pt[Length-1].y;
				x=pt[Length-1].x-size;
				break;
			case VK_RIGHT:
				if(Next==VK_LEFT)
				{
					SendMessage(hwnd,WM_RESTART,0,0);
					return 0;
				}
				y=pt[Length-1].y;
				x=pt[Length-1].x+size;
				break;
			default :
				return 0;
		}
		if(x>xCount*size||y>yCount*size||x<size||y<size)
		{
			SendMessage(hwnd,WM_RESTART,0,0);
			return 0;
		}
		if(used[x/size][y/size]==1&&!(pt[0].x==x&&pt[0].y==y))
		{
			SendMessage(hwnd,WM_RESTART,0,0);
			return 0;
		}
		else
		{
			bStart=true;
			if(used[x/size][y/size]==2)
			{
				pt[Length].x=x;
				pt[Length].y=y;
				used[x/size][y/size]=1;
				Length++;
				if(Length==Max_Len)
				{
					bWin=true;
					SendMessage(hwnd,WM_RESTART,0,0);
					bWin=false;
					return 0;
				}
				SetTimer(hwnd,M,Time-Time*Length/Max_Len+10,NULL);
				food=randFood(xCount,yCount);
			}
			else
			{
				used[pt[0].x/size][pt[0].y/size]=0;
				for(int i=1;i<Length;i++)
					pt[i-1]=pt[i];
				used[x/size][y/size]=1;
				pt[Length-1].x=x;
				pt[Length-1].y=y;
			}
			InvalidateRect(hwnd,NULL,TRUE);
			Next=wParam;
		}
		break;
		}
	case WM_RESTART:
		restart(hwnd,Length,bStart,food,xCount,yCount,pt,Next);
		if(MessageBox(hwnd,bWin?TEXT("你贏了！\n要繼續嗎？"):TEXT("你輸了！\n要繼續嗎？"),TEXT("消息"),MB_YESNO)==IDNO)
		{
			SendMessage(hwnd,WM_DESTROY,0,0);
			return 0;
		}
		InvalidateRect(hwnd,NULL,TRUE);
		break;
	case WM_DESTROY:
		KillTimer(hwnd,M);
		PostQuitMessage(0);
		break;
	}
	return DefWindowProc(hwnd,message,wParam,lParam);
}