GDI+: GdipSetImageAttributesWrapMode

[José Roca]

The following example calls GdipDrawImageRectRectI twice. In both calls, the specified source rectangle is four times as large as the image itself. In the first call to GdipDrawImageRectRectI, the ImageAttributes object has its wrap mode set to WrapModeClamp, so the portion of the source rectangle outside the image is filled with red according to the second argument passed to SetWrapMode. In the second call to GdipDrawImageRectRectI, the ImageAttributes object has its wrap mode set to WrapModeTile, so the portion of the source rectangle outside the image is filled with repeated copies of the image.

C++

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VOID Example_SetWrapMode(HDC hdc)
{
   Graphics graphics(hdc);
   Image image(L"Climber.jpg");
   ImageAttributes imAtt;

   imAtt.SetWrapMode(WrapModeClamp);
   graphics.DrawImage(&image,
      Rect(10, 10, image.GetWidth(), image.GetHeight()),  // dest rect
      0, 0, 2*image.GetWidth(), 2*image.GetHeight(),      // source rect
      UnitPixel,
      &imAtt);

   imAtt.SetWrapMode(WrapModeTile);
   graphics.DrawImage(&image,
      Rect(200, 10, image.GetWidth(), image.GetHeight()),  // dest rect
      0, 0, 2*image.GetWidth(), 2*image.GetHeight(),       // source rect
      UnitPixel,
      &imAtt);
}


PowerBASIC

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SUB GDIP_SetImageAttributesWrapMode (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pImage AS DWORD
   LOCAL pImgAttr AS DWORD
   LOCAL strFileName AS STRING
   LOCAL nWidth AS LONG
   LOCAL nHeight AS LONG

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   strFileName = UCODE$("climber.jpg")
   hStatus = GdipLoadImageFromFile(STRPTR(strFileName), pImage)
   hStatus = GdipCreateImageAttributes(pImgAttr)

   GdipSetImageAttributesWrapMode(pImgAttr, %WrapModeClamp, GDIP_ARGB(255, 255, 0, 0), %FALSE)
   hStatus = GdipGetImageWidth(pImage, nWidth)
   hStatus = GdipGetImageHeight(pImage, nHeight)
   hStatus = GdipDrawImageRectRectI(pGraphics, pImage, _
             10, 10, nWidth, nHeight, _     ' dest rect
             0, 0, 2*nWidth, 2*nHeight, _   ' source dest
             %UnitPixel, pImgAttr, %NULL, %NULL)
   GdipSetImageAttributesWrapMode(pImgAttr, %WrapModeTile, GDIP_ARGB(255, 255, 0, 0), %FALSE)
   hStatus = GdipDrawImageRectRectI(pGraphics, pImage, _
             200, 10, nWidth, nHeight, _     ' dest rect
             0, 0, 2*nWidth, 2*nHeight, _   ' source dest
             %UnitPixel, pImgAttr, %NULL, %NULL)

   ' // Cleanup
   IF pImgAttr THEN GdipDisposeImageAttributes(pImgAttr)
   IF pImage THEN GdipDisposeImage(pImage)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB


The following illustration shows the output of the preceding code.