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先看效果：
效果還是不錯滴。
這功能就有點像PS的圖層和蒙板了。
簡單的添加一個層：
private void draw_mb(CanvasControl sender, CanvasDrawingSession drawingSession) { draw_normal(sender, drawingSession); using (drawingSession.CreateLayer(1)) { drawingSession.FillRectangle(0, 0, oriImage_.SizeInPixels.Width, oriImage_.SizeInPixels.Height, Color.FromArgb(128, 255, 255, 255)); } }
注意：一定要使用using，否則會出錯！！！！
第二效果呢，先畫個模糊背景，再加一個圓就OK了，圓使用圖片填充，就可以顯示清晰的圓形圖片了~~~~~~
private void draw_mb2(CanvasControl sender, CanvasDrawingSession drawingSession) { Microsoft.Graphics.Canvas.Effects.GaussianBlurEffect gaussianEffect = new Microsoft.Graphics.Canvas.Effects.GaussianBlurEffect(); gaussianEffect.BlurAmount = 10; gaussianEffect.Source = oriImage_; drawingSession.DrawImage(gaussianEffect); float width = oriImage_.SizeInPixels.Width; float height = oriImage_.SizeInPixels.Height; using (drawingSession.CreateLayer(1)) { Microsoft.Graphics.Canvas.Brushes.CanvasImageBrush br = new Microsoft.Graphics.Canvas.Brushes.CanvasImageBrush(sender); br.Image = oriImage_; drawingSession.FillCircle(new System.Numerics.Vector2(width / 2, height / 2-60), 60, br); } }
第三個效果，也是相當簡單啦，第二個效果都出來了，第三個效果簡直就是複製粘貼那麼簡單：
private void draw_mosaic(CanvasControl sender, CanvasDrawingSession drawingSession) { draw_normal(sender, drawingSession); float width = oriImage_.SizeInPixels.Width; float height = oriImage_.SizeInPixels.Height; using (drawingSession.CreateLayer(1f)) { Microsoft.Graphics.Canvas.Effects.GaussianBlurEffect gaussianEffect = new Microsoft.Graphics.Canvas.Effects.GaussianBlurEffect(); gaussianEffect.BlurAmount = 5; gaussianEffect.Source = oriImage_; Microsoft.Graphics.Canvas.Brushes.CanvasImageBrush br = new Microsoft.Graphics.Canvas.Brushes.CanvasImageBrush(sender); br.Image = gaussianEffect; br.SourceRectangle = new Rect(0, 0, width, height); drawingSession.FillCircle(new System.Numerics.Vector2(width / 2, height / 2 - 60), 60, br); } }
PS：本來想用微軟的“微軟牛津計劃”的面部識別技術進行動態識別人臉。。。但是那個庫需要連網，而且不牆的話，網速不是很理想，所以就放棄了，使用固定的座標好了。
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原文地址：http://www.cnblogs.com/lin277541/p/5074697.html
