void DrawSample(Graphics graphics)
{
using (graphics.Platform.Context)
{
graphics.FillRectangle(Brushes.Green, 0, 0, 200, 200);
if (UseGraphicsPathClip)
{
var path = GraphicsPath.GetRoundRect(new RectangleF(10, 10, 180, 180), 20);
graphics.SetClip(path);
}
else
graphics.SetClip(new RectangleF(10, 10, 180, 180));
if (UseClearColor)
graphics.Clear(new SolidBrush(new Color(Colors.Red, 0.5f)));
else
graphics.Clear();
graphics.FillEllipse(Brushes.Blue, 25, 25, 150, 150);
}
}
protected sealed override void OnPaint(PaintEventArgs e)
{
if (EnableDoubleBuffering)
{
var screen = ParentWindow.Screen;
var scale = screen.RealScale / screen.Scale;
renderSize = Size.Round(e.ClipRectangle.Size * scale);
if (bitmap == null ||
bitmap.Size.Width < renderSize.Width ||
bitmap.Size.Height < renderSize.Height)
{
if (bitmap != null)
bitmap.Dispose();
bitmap = new Bitmap(renderSize, PixelFormat.Format32bppRgba);
}
var bitmapGraphics = new Graphics(bitmap);
bitmapGraphics.Clear(Brushes.Cached(BackgroundColor));
bitmapGraphics.ScaleTransform(scale);
bitmapGraphics.TranslateTransform(-e.ClipRectangle.Location);
bitmapGraphics.SetClip(e.ClipRectangle * scale); // should be affected by transform
var childArgs = new PaintEventArgs(bitmapGraphics, e.ClipRectangle);
base.OnPaint(childArgs);
OnBufferedPaint(childArgs);
bitmapGraphics.Dispose();
bitmapGraphics = null;
e.Graphics.DrawImage(bitmap, new RectangleF(renderSize), e.ClipRectangle);
if (Platform.IsWpf)
{
// wpf runs out of resources fast here, so we garbage collect
GC.Collect();
}
}
else
{
base.OnPaint(e);
OnBufferedPaint(e);
}
}
public Graphics BeginDraw(PaintEventArgs e)
{
if (UseOffScreenBitmap)
{
if (OffscreenBitmap == null ||
OffscreenBitmap.Size.Width < e.ClipRectangle.Width ||
OffscreenBitmap.Size.Height < e.ClipRectangle.Height)
{
if (OffscreenBitmap != null)
OffscreenBitmap.Dispose();
OffscreenBitmap = new Bitmap(Size.Round(e.ClipRectangle.Size), PixelFormat.Format32bppRgba);
}
bitmapGraphics = new Graphics(OffscreenBitmap);
bitmapGraphics.TranslateTransform(-e.ClipRectangle.Location);
bitmapGraphics.SetClip(e.ClipRectangle);
bitmapGraphics.Clear(Brushes.Cached(drawable.BackgroundColor));
return bitmapGraphics;
}
return e.Graphics;
}