void Canvas_Draw(CanvasControl sender, CanvasDrawEventArgs args)
{
if (CanvasImage.IsHistogramSupported(sender.Device))
{
SetEffectProperties();
// Draw the image.
if (!ThumbnailGenerator.IsDrawingThumbnail)
{
args.DrawingSession.DrawImage(hueEffect, (sender.Size.ToVector2() - bitmap.Size.ToVector2()) * new Vector2(0.5f, 0.25f));
}
// Overlay a histogram for each color channel.
args.DrawingSession.Blend = CanvasBlend.Add;
DrawHistogram(args.DrawingSession, sender.Size, EffectChannelSelect.Red, redBrush);
DrawHistogram(args.DrawingSession, sender.Size, EffectChannelSelect.Green, greenBrush);
DrawHistogram(args.DrawingSession, sender.Size, EffectChannelSelect.Blue, blueBrush);
}
else
{
DrawNotSupported(args.DrawingSession, sender.Size);
}
}