GDI+: GdipGetImageThumbnail

[José Roca]

The following example creates a rotation matrix and passes the address of that matrix to the GdipSetWorldTransform function. The code calls the GdipDrawRectangle function to draw a rotated rectangle.

C++

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VOID Example_GetThumbnail(HDC hdc)
{
   Graphics graphics(hdc);

   // Create an image and a thumbnail of the image.
   Image image(L"Crayons.jpg");
   Image* pThumbnail = image.GetThumbnailImage(40, 40, NULL, NULL);

   // Draw the original and the thumbnail images.
   graphics.DrawImage(&image, 10, 10, image.GetWidth(), image.GetHeight());
   graphics.DrawImage(
      pThumbnail,
      150,
      10,
      pThumbnail->GetWidth(),
      pThumbnail->GetHeight());

   delete pThumbnail;

}


PowerBASIC

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SUB GDIP_GetImageThumbnail (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL strFileName AS STRING
   LOCAL pImage AS DWORD
   LOCAL nWidth AS DWORD
   LOCAL nHeight AS DWORD
   LOCAL pThumbnail AS DWORD
   LOCAL nThumbnailWidth AS DWORD
   LOCAL nThumbnailHeight AS DWORD

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   ' // Create an image and a thumbnail of the image.
   strFileName = UCODE$("climber.jpg")
   hStatus = GdipLoadImageFromFile(STRPTR(strFileName), pImage)
   hStatus = GdipGetImageThumbnail(pImage, 40, 40, pThumbnail, %NULL, %NULL)

   ' // Draw the original and the thumbnail images.
   hStatus = GdipGetImageWidth(pImage, nWidth)
   hStatus = GdipGetImageHeight(pImage, nHeight)
   hStatus = GdipDrawImageRect(pGraphics, pImage, 10, 10, nWidth, nHeight)

   hStatus = GdipGetImageWidth(pThumbnail, nThumbnailWidth)
   hStatus = GdipGetImageHeight(pThumbnail, nThumbnailHeight)
   hStatus = GdipDrawImageRect(pGraphics, pThumbnail, 200, 10, nThumbnailWidth, nThumbnailHeight)

   ' // Cleanup
   IF pThumbnail THEN GdipDisposeImage(pThumbnail)
   IF pImage THEN GdipDisposeImage(pImage)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB