metafile.c

图形基础 GDI 的例子

/*----------------------------------------------
   METAFILE.C -- Metafile Demonstration Program
                 (c) Charles Petzold, 1996
  ----------------------------------------------*/

#include <windows.h>

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
     {
     static char szAppName [] = "Metafile" ;
     HWND        hwnd ;
     MSG         msg ;
     WNDCLASSEX  wndclass ;

     wndclass.cbSize        = sizeof (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 ;
     wndclass.hIconSm       = LoadIcon (NULL, IDI_APPLICATION) ;

     RegisterClassEx (&wndclass) ;

     hwnd = CreateWindow (szAppName, "Metafile Demonstration",
                          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 WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
     {
     static HMETAFILE hmf ;
     static int       cxClient, cyClient ;
     HBRUSH           hBrush ;
     HDC              hdc, hdcMeta ;
     int              x, y ;
     PAINTSTRUCT      ps ;

     switch (iMsg)
          {
          case WM_CREATE:
               hdcMeta = CreateMetaFile (NULL) ;
               hBrush  = CreateSolidBrush (RGB (0, 0, 255)) ;

               Rectangle (hdcMeta, 0, 0, 100, 100) ;

               MoveToEx (hdcMeta,   0,   0, NULL) ;
               LineTo   (hdcMeta, 100, 100) ;
               MoveToEx (hdcMeta,   0, 100, NULL) ;
               LineTo   (hdcMeta, 100,   0) ;

               SelectObject (hdcMeta, hBrush) ;
               Ellipse (hdcMeta, 20, 20, 80, 80) ;

               hmf = CloseMetaFile (hdcMeta) ;

               DeleteObject (hBrush) ;
               return 0 ;

          case WM_SIZE:
               cxClient = LOWORD (lParam) ;
               cyClient = HIWORD (lParam) ;
               return 0 ;

          case WM_PAINT:
               hdc = BeginPaint (hwnd, &ps) ;

               SetMapMode (hdc, MM_ANISOTROPIC) ;
               SetWindowExtEx (hdc, 1000, 1000, NULL) ;
               SetViewportExtEx (hdc, cxClient, cyClient, NULL) ;

               for (x = 0 ; x < 10 ; x++)
                    for (y = 0 ; y < 10 ; y++)
                         {
                         SetWindowOrgEx (hdc, -100 * x, -100 * y, NULL) ;
                         PlayMetaFile (hdc, hmf) ;
                         }

               EndPaint (hwnd, &ps) ;
               return 0 ;

          case WM_DESTROY:
               DeleteMetaFile (hmf) ;
               PostQuitMessage (0) ;
               return 0 ;
          }
     return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
     }