GDI+: GdipMultiplyTextureTransform

[José Roca]

The following example creates a texture brush and sets the transformation of the brush. The code then uses the transformed brush to fill a rectangle.

C++

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

   Matrix matrix(3, 0, 0, 1, 0, 0); // Horizontal stretch

   Image image(L"HouseAndTree.Gif");
   TextureBrush textureBrush(&image);
   textureBrush.RotateTransform(30);                            // rotate
   textureBrush.MultiplyTransform(&matrix, MatrixOrderAppend);  // stretch
   graphics.FillRectangle(&textureBrush, 0, 0, 400, 200);
}


PowerBASIC

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SUB GDIP_MultiplyTextureTransform (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)

   hStatus = GdipCreateMatrix2(3, 0, 0, 1, 0, 0, pMatrix)   ' // Horizontal stretch

   ' // Create a texture brush, and set its wrap mode.
   strFileName = UCODE$("HouseAndTree.gif")
   hStatus = GdipLoadImageFromFile(STRPTR(strFileName), pImage)
   hStatus = GdipCreateTexture(pImage, %WrapModeTile, pTextureBrush)
   hStatus = GdipRotateTextureTransform(pTextureBrush, 30, %MatrixOrderPrepend)         ' rotate
   hStatus = GdipMultiplyTextureTransform(pTextureBrush, pMatrix, %MatrixOrderAppend)   ' stretch
   hStatus = GdipFillRectangleI(pGraphics, pTextureBrush, 0, 0, 400, 200)

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

END SUB


The following illustration shows the output of the preceding code.