【WIN10】WIN2D——圖層

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。