Stretching an Image

The following example stretches the images of a video clip. It increases the dimensions of the destination rectangle by using the MCIWndPutDest macro. The size of the playback area remains unchanged, so the result is a distorted, magnified image. The examples uses the MCIWndPutDest function to reposition the destination rectangle with respect to the playback area, providing a way to view different portions of the stretched image.



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. 


 

 

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