/* An example figure that show how one can use the CompositingMode
* to do a decent alpha blend.
* However this is a bit slower and does not blend the edges of the
* bitmap with the canvas when AntiAlias is turned on.
*
* Needs more work/thinking...
*/
protected override void PaintBody(DGraphics dg)
{
if (Width > 0 && Height > 0)
{
DBitmap bmp = GraphicsHelper.MakeBitmap(Width, Height);
DGraphics bmpGfx = GraphicsHelper.MakeGraphics(bmp);
bmpGfx.AntiAlias = dg.AntiAlias;
bmpGfx.CompositingMode = DCompositingMode.SourceCopy;
bmpGfx.FillRect(1, 1, Width - 2, Height - 2, DColor.Blue, Alpha);
bmpGfx.FillRect(1, 1, 2 * Width / 3, 2 * Height / 3, DColor.Red, Alpha);
bmpGfx.FillRect(Width / 3, Height / 3, 2 * Width / 3 - 1, 2 * Height / 3 - 1, DColor.Green, Alpha);
dg.DrawBitmap(bmp, Rect, Alpha);
bmpGfx.Dispose();
bmp.Dispose();
}
}
public override void Paint(DGraphics dg, Figure f, double scale)
{
dg.DrawBitmap(bmp, GetRect(Position, f.GetSelectRect(), scale));
}
protected override void PaintBody(DGraphics dg)
{
if (Bitmap != null)
{
dg.Save();
dg.Clip(Rect);
switch (BitmapPosition)
{
case DBitmapPosition.Stretch:
dg.DrawBitmap(Bitmap, Rect, Alpha);
break;
case DBitmapPosition.Normal:
dg.DrawBitmap(Bitmap, TopLeft, Alpha);
break;
case DBitmapPosition.Center:
dg.DrawBitmap(Bitmap, new DPoint(X + Width / 2 - Bitmap.Width / 2,
Y + Height / 2 - Bitmap.Height / 2), Alpha);
break;
case DBitmapPosition.Tile:
int xTimes = (int)Math.Ceiling(Width / Bitmap.Width);
int YTimes = (int)Math.Ceiling(Height / Bitmap.Height);
for (int i = 0; i < xTimes; i++)
for (int j = 0; j < YTimes; j++)
dg.DrawBitmap(Bitmap, new DPoint(X + i * Bitmap.Width, Y + j * Bitmap.Height), Alpha);
break;
case DBitmapPosition.StretchWithAspectRatio:
double sx = Width / Bitmap.Width;
double sy = Height / Bitmap.Height;
DRect bmpRect;
if (sx > sy)
{
double w = sy * Bitmap.Width;
bmpRect = new DRect(X + Width / 2 - w / 2, Y, w, Height);
}
else
{
double h = sx * Bitmap.Height;
bmpRect = new DRect(X, Y + Height / 2 - h / 2, Width, h);
}
dg.DrawBitmap(Bitmap, bmpRect, Alpha);
break;
}
dg.Restore();
}
}
