GDI+: GdipGetTextureTransform

[José Roca]

The following example creates a texture brush and sets the transformation of the brush. The code then gets the brush's transformation matrix and proceeds to inspect or use the elements.

C++

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VOID Example_GetTransform(HDC hdc)
{
   Graphics graphics(hdc);
 
   // Create a texture brush, and set its transform.
   Image image(L"marble.jpg");
   TextureBrush textureBrush(&image);
   textureBrush.ScaleTransform(3, 2);

   // Obtain information about the texture brush.
   Matrix matrix;
   REAL elements[6];

   textureBrush.GetTransform(&matrix);
   matrix.GetElements(elements);

   for(INT j = 0; j <=5; ++j)
   {
      // Inspect or use the value in elements[j].
   }
}


PowerBASIC

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SUB GDIP_GetTextureTransform (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pImage AS DWORD
   LOCAL pTextureBrush AS DWORD
   LOCAL pMatrix AS DWORD
   LOCAL strFileName AS STRING

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   ' // Create a texture brush, and set its transform.
   strFileName = UCODE$("houseandtree.gif")
   hStatus = GdipLoadImageFromFile(STRPTR(strFileName), pImage)
   hStatus = GdipCreateTexture(pImage, %WrapModeTile, pTextureBrush)
   hStatus = GdipScaleTextureTransform(pTextureBrush, 3, 2, %MatrixOrderPrepend)

   ' // Obtain information about the texture brush.
   hStatus = GdipCreateMatrix(pMatrix)
   DIM elements(23) AS SINGLE   ' 6 * SIZEOF(SINGLE), i.e. 24 elements

   hStatus = GdipGetTextureTransform(pTextureBrush, pMatrix)
   hStatus = GdipGetMatrixElements(pMatrix, elements(0))

   LOCAL j AS LONG
   FOR j = 0 TO 23
      ' // Inspect or use the value in elements[j].
      OutputDebugString STR$(elements(j))
   NEXT

   ' // Cleanup
   IF pMatrix THEN GdipDeleteMatrix(pMatrix)
   IF pImage THEN GdipDisposeImage(pImage)
   IF pTextureBrush THEN GdipDeleteBrush(pTextureBrush)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB