GDI+: GdipBitmapGetPixel

[José Roca]

The following example creates a Bitmap object based on a JPEG file. The code calls the GdipBitmapGetPixel function to obtain the color of a pixel in the bitmap and then fills a rectangle with the retrieved color.

C++

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VOID Example_GetPixel(HDC hdc)

{

   Graphics graphics(hdc);

   // Create a Bitmap object from a JPEG file.
   Bitmap myBitmap(L"Climber.jpg");

   // Get the value of a pixel from myBitmap.
   Color pixelColor;
   myBitmap.GetPixel(25, 25, &pixelColor);

   // Fill a rectangle with the pixel color.
   SolidBrush brush(pixelColor);
   graphics.FillRectangle(&brush, Rect(0, 0, 100, 100));
}


PowerBASIC

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SUB GDIP_GetPixel (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pBitmap AS DWORD
   LOCAL pSolidBrush AS DWORD
   LOCAL strFileName AS STRING
   LOCAL pixelColor AS DWORD

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   '  // Create a Bitmap object from a JPEG file.
   strFileName = UCODE$("climber.jpg")
   hStatus = GdipCreateBitmapFromFile(STRPTR(strFileName), pBitmap)

   ' // Get the value of a pixel from myBitmap.
   hStatus = GdipBitmapGetPixel(pBitmap, 10, 10, pixelColor)

   ' // Fill a rectangle with the pixel color.
   hStatus = GdipCreateSolidFill(pixelColor, pSolidBrush)
   hStatus = GdipFillRectangleI(pGraphics, pSolidBrush, 0, 0, 100, 100)

   ' // Cleanup
   IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
   IF pBitmap THEN GdipDisposeImage(pBitmap)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB