MyRegisterClass(hInstance);

//初始化
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

//消息循环
GetMessage(&msg,NULL,NULL,NULL); //初始化msg
while( msg.message!=WM_QUIT )
{
if( PeekMessage( &msg, NULL, 0,0 ,PM_REMOVE) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
else
{
tNow = GetTickCount();
if(tNow-tPre >= 50)
MyPaint(hdc);
}
}

return msg.wParam;
}

//****设计一个窗口类，类似填空题，使用窗口结构体*********************
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = NULL;
wcex.hCursor = NULL;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = "maple";
wcex.hIconSm = NULL;

return RegisterClassEx(&wcex);
}

//****初始化函数*************************************
// 1.加载位图资源
// 2.取得内部窗口区域信息
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HBITMAP bmp;
hInst = hInstance;

hWnd = CreateWindow("maple", "浅墨的绘图窗口" , WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

if (!hWnd)
{
return FALSE;
}

MoveWindow(hWnd,10,10,600,450,true);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

hdc = GetDC(hWnd);
mdc = CreateCompatibleDC(hdc);
bufdc = CreateCompatibleDC(hdc);
bmp = CreateCompatibleBitmap(hdc,640,480);

SelectObject(mdc,bmp);

bg = (HBITMAP)LoadImage(NULL,"bg.bmp",IMAGE_BITMAP,640,480,LR_LOADFROMFILE);
angrybird = (HBITMAP)LoadImage(NULL,"angrybird.bmp",IMAGE_BITMAP,120,60,LR_LOADFROMFILE);

GetClientRect(hWnd,&rect);
SelectObject(bufdc,bg);
BitBlt(mdc,0,0,640,480,bufdc,0,0,SRCCOPY);
MyPaint(hdc);

return TRUE;
}

//****自定义绘图函数*********************************
// 1.窗口贴图
// 2.计算小球速度，坐标以及判断是否碰到窗口下缘
void MyPaint(HDC hdc)
{
SelectObject(bufdc,bg);
BitBlt(mdc,0,0,640,480,bufdc,0,0,SRCCOPY);

SelectObject(bufdc,angrybird);
BitBlt(mdc,x,y,60,60,bufdc,60,0,SRCAND);
BitBlt(mdc,x,y,60,60,bufdc,0,0,SRCPAINT);

BitBlt(hdc,0,0,640,480,mdc,0,0,SRCCOPY);

x += vx; //计算X轴方向贴图坐标，每调用一次MyPiant（），x坐标就加上一个恒定不变的vx，相当于匀速运动

vy = vy + gy; //计算Y轴方向速度分量，vy随着每一次MyPiant（）函数的调用就加上一个gy（重力加速度）
y += vy; //计算Y轴方向贴图坐标，每调用一次MyPiant（），y坐标就加上一个刚改变过后的vy，相当于加速运动

//判断是否触地，如果触碰到窗口边界，vy调整为相反方向
if(y >= rect.bottom-60)
{
y = rect.bottom - 60;
vy = -vy;
}

tPre = GetTickCount(); //记录上次的绘图时间
}

//****消息处理函数***********************************
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_KEYDOWN: //按键消息
if(wParam==VK_ESCAPE) //按下【Esc】键
PostQuitMessage(0);
break;
case WM_DESTROY: //窗口结束消息
DeleteDC(mdc);
DeleteDC(bufdc);
DeleteObject(bg);
DeleteObject(angrybird);
ReleaseDC(hWnd,hdc);
PostQuitMessage(0);
break;
default: //其他消息
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

该demo运行的截图如下：

作者：zhmxy555