polyrgn.c

C#一个实例源代码

/*--------------------------------------------------
  PolyRgn.c
  --------------------------------------------------*/
#include <windows.h>

LRESULT CALLBACK MainWndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("PolyRgn") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;
     
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = MainWndProc ;
     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 ("Program requires Windows NT!"), 
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName, TEXT ("PolyRgn"),
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;
     
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}


LRESULT CALLBACK MainWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     HDC         hdc ;
     PAINTSTRUCT ps ;

	 HRGN   rgnA;
	 int nRgnBoxResult;
     HBRUSH brA, brB;
     RECT  rectRgnBox;


POINT ptVertex[5];

ptVertex[0].x = 180;
ptVertex[0].y = 80;
ptVertex[1].x = 100;
ptVertex[1].y = 160;
ptVertex[2].x = 120;
ptVertex[2].y = 260;
ptVertex[3].x = 240;
ptVertex[3].y = 260;
ptVertex[4].x = 260;
ptVertex[4].y = 160;


     switch (message)

     {
     case WM_PAINT :
          hdc = BeginPaint (hwnd, &ps) ;
          
           rgnA=CreatePolygonRgn( ptVertex, 5, ALTERNATE);
           nRgnBoxResult = GetRgnBox(rgnA ,&rectRgnBox );
           brA=CreateSolidBrush( RGB(255, 0, 0));  // rgnA Red
           FrameRgn( hdc,rgnA, brA, 2, 2 );
           brB=CreateSolidBrush( RGB(0, 0, 255) );  // Blue
           InflateRect(&rectRgnBox,3,3);
           FrameRect( hdc,&rectRgnBox, brB );
		  		  
	       DeleteObject(rgnA);
		   DeleteObject(brA);
		   DeleteObject(brB);
		  
		  EndPaint (hwnd, &ps) ;
          return 0 ;

     case WM_DESTROY :
		  PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}