精灵动画，一个很有趣的工程

#include <windows.h> int iCarX=-200,iCarY=200; HINSTANCE hInstance; HDC hdcSrc,hdcBack,hdcMem; HBITMAP hBitmapSrc,hBitmapBack,hBitmapMem; LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; int Render(HDC hdc); int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("Spirit") ; HWND hwnd ; MSG msg ; WNDCLASS wndclass ; wndclass.style = CS_HREDRAW | CS_VREDRAW ; wndclass.lpfnWndProc = WndProc ; wndclass.cbClsExtra = 0 ; wndclass.cbWndExtra = 0 ; wndclass.hInstance = hInstance ; wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ; wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ; wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = NULL ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass)) { MessageBox ( NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow( szAppName, TEXT ("Spirit Demo 精灵动画演示"), WS_OVERLAPPEDWINDOW ^ WS_MAXIMIZEBOX, CW_USEDEFAULT, CW_USEDEFAULT, 388, 517, NULL, NULL, hInstance, NULL) ; ShowWindow (hwnd, iCmdShow) ; UpdateWindow (hwnd) ; while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg) ; DispatchMessage (&msg) ; } return msg.wParam ; } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; PAINTSTRUCT ps; RECT rect; switch (message){ case WM_CREATE: hInstance=((LPCREATESTRUCT)lParam)->hInstance; hdc=GetDC(hwnd); hdcSrc=CreateCompatibleDC(hdc); //源图像DC hdcBack=CreateCompatibleDC(hdc); //目标图像DC hdcMem=CreateCompatibleDC(hdc); //内存DC hBitmapSrc=LoadBitmap(hInstance,TEXT("CARS")); //读图像 hBitmapBack=LoadBitmap(hInstance,TEXT("SCENE")); hBitmapMem=CreateCompatibleBitmap(hdc,388,517); //为内存DC建立一个位图 SelectObject(hdcSrc,hBitmapSrc); //将位图分别选入DC SelectObject(hdcBack,hBitmapBack); SelectObject(hdcMem,hBitmapMem); SetTimer(hwnd,1,10,NULL); //定时器，间隔10ms return 0 ; case WM_PAINT: hdc = BeginPaint (hwnd, &ps) ; GetClientRect (hwnd, &rect) ; Render(hdc); //我们的渲染函数 EndPaint (hwnd, &ps) ; return 0 ; case WM_TIMER: iCarX+=1; //移动 if (iCarX>389) { KillTimer(hwnd,1); return 0; } InvalidateRect(hwnd,NULL,NULL); //这两句使窗口内容更新，即调用我们的渲染函数 UpdateWindow(hwnd); return 0; case WM_DESTROY: DeleteDC(hdcSrc); DeleteDC(hdcBack); DeleteObject(hBitmapSrc); DeleteObject(hBitmapBack); PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; } int Render(HDC hdc){ BitBlt(hdcMem,0,0,388,517,hdcBack,0,0,SRCCOPY); //将背景拷贝到内存DC上 BitBlt(hdcMem,iCarX,iCarY,220,133,hdcSrc,220,0,SRCAND); //处理掩码图 BitBlt(hdcMem,iCarX,iCarY,220,133,hdcSrc,0,0,SRCPAINT); //处理目标图像 BitBlt(hdc,0,0,388,517,hdcMem,0,0,SRCCOPY); //画到屏幕上的窗口的DC return 0; }