縮放影像

下列範例會延展視訊剪輯的影像。 它會使用 MCIWndPutDest 宏來增加目的矩形的維度。 播放區域的大小會保持不變，因此結果是扭曲、放大的影像。 這些範例會使用 MCIWndPutDest 函式來重新置放與播放區域相關的目的地矩形，並提供一種方式來檢視延伸影像的不同部分。

extern RECT rCurrent, rDest; 
 
case WM_COMMAND: 
   switch (wParam) 
   { 
       case IDM_CREATEMCIWND: 
           g_hwndMCIWnd = MCIWndCreate(hwnd, 
               g_hinst, 
               WS_CHILD | WS_VISIBLE, 
               "sample.avi"); 
           break; 
 
       case  IDM_STRETCHIMAGE:      // stretch destination RECT 3:2, 
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT 
           rDest.top = rCurrent.top;               // new boundaries 
           rDest.right = rCurrent.right; 
           rDest.left = rCurrent.left + 
               ((rCurrent.left - rCurrent.right) * 3); 
           rDest.bottom = rCurrent.top + 
               ((rCurrent.bottom - rCurrent.top) * 2); 
           MCIWndPutDest(g_hwndMCIWnd, &rDest); // new destination 
           break; 
       case IDM_MOVEDOWN:           // move toward bottom of image 
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT 
           rCurrent.top -= 100;                    // new boundaries 
           rCurrent.bottom -= 100; 
           MCIWndPutDest(g_hwndMCIWnd, &rCurrent); // new destination
           break; 
       case IDM_MOVEUP:             // move toward top of image 
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT 
           rCurrent.top += 100;                    // new boundaries 
           rCurrent.bottom += 100; 
           MCIWndPutDest(g_hwndMCIWnd, &rCurrent); // new destination 
           break; 
       case IDM_MOVELEFT:           // move toward left edge of image
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT 
           rCurrent.right += 100;                  // new boundaries 
           rCurrent.left += 100; 
           MCIWndPutDest(g_hwndMCIWnd, &rCurrent); // new destination 
           break; 
       case  IDM_MOVERIGHT:         // move toward right edge of image
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT
           rCurrent.right -= 100;                  // new boundaries 
           rCurrent.left -= 100; 
           MCIWndPutDest(g_hwndMCIWnd, &rCurrent); // new destination 
           break; 
   } 
   break; 
 
   // Handle other messages here.