spirit.cpp

精灵动画的实现

#include <windows.h>

int iCarX=-200,iCarY=200;
HINSTANCE hInstance;
HDC hdcSrc,hdcBack,hdcMem;
HBITMAP hBitmapSrc,hBitmapBack,hBitmapMem;
/*
void CALLBACK TimerProc(
HWND hwnd, 
UINT uMsg, 
UINT idEvent, 
DWORD dwTime )
{
	MessageBox(NULL,"Hello!","Caption",0);} 
*/
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:
		// Obtain the window's client rectangle 
/*
GetClientRect(hwnd, &rect); 
 
// THE FIX: by setting the background mode 
// to transparent, the region is the text itself 
// SetBkMode(hdc, TRANSPARENT); 
 
// Bracket begin a path 
BeginPath(hdc); 
 
// Send some text out into the world 
TextOut(hdc, rect.left, rect.top, "Defenestration can be hazardous", 4); 
 
// Bracket end a path 
EndPath(hdc); 
 
// Derive a region from that path 
SelectClipPath(hdc, RGN_AND); 
 
// This generates the same result as SelectClipPath() 
// SelectClipRgn(hdc, PathToRegion(hdc)); 
 
// Fill the region with grayness 
FillRect(hdc, &rect, (HBRUSH)GetStockObject(GRAY_BRUSH)); 

*/

		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;
		}
		rect.right=300; rect.bottom=300;
		InvalidateRect(hwnd,NULL,FALSE); //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
//		TextOut(hdcMem,100,100,"Hello!",6);

	BitBlt(hdc,0,0,388,517,hdcMem,0,0,SRCCOPY);          //画到屏幕上的窗口的DC
	return 0;
}