PowerBasic Museum 2020-A

The following example creates a solid brush based on a color that has an alpha component of 128. The code uses that brush to paint two ellipses. The first ellipse is painted with the compositing mode set to CompositingQualityHighSpeed, and the second ellipse is painted with the compositing mode set to CompositingQualityHighQuality.

C++


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

   // Set the smoothing mode to SmoothingModeHighSpeed, and fill an ellipse.
   graphics.SetSmoothingMode(SmoothingModeHighSpeed);
   graphics.FillEllipse(&SolidBrush(Color(255, 0, 0, 0)), 0, 0, 200, 100);

   // Set the smoothing mode to SmoothingModeHighQuality, and fill an ellipse.
   graphics.SetSmoothingMode(SmoothingModeHighQuality);
   graphics.FillEllipse(&SolidBrush(Color(255, 0, 0, 0)), 200, 0, 200, 100);
}


PowerBASIC


SUB GDIP_SetSmoothingMode (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pBrush AS DWORD

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   ' // Create a SolidBrush object with an alpha-blended color.
   hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 0, 0, 0), pBrush)

   ' // Set the smoothing mode to SmoothingModeHighSpeed, and fill an ellipse.
   hStatus = GdipSetSmoothingMode(pGraphics, %SmoothingModeHighSpeed)
   hStatus = GdipFillEllipse(pGraphics, pBrush, 0, 0, 200, 100)

   ' // Set the smoothing mode to SmoothingModeHighSpeed, and fill an ellipse.
   hStatus = GdipSetSmoothingMode(pGraphics, %SmoothingModeHighQuality)
   hStatus = GdipFillEllipse(pGraphics, pBrush, 200, 0, 200, 100)

   ' // Cleanup
   IF pBrush THEN GdipDeleteBrush(pBrush)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB


(http://www.jose.it-berater.org/captures/GdipSetSmoothingMode.png)