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  • 在WPF下快速生成线的方法

    如果线较多时,在画布中用Path或Line生成时会比较慢。用DrawingVisual可以快速生成,这个在之前我的博客中已经提到。但在类库形式下生成的无法看到,保存成Image后再加入图层后成功显示。

     

    DrawingVisual drawingVisual = new DrawingVisual();
                DrawingContext drawingContext = drawingVisual.RenderOpen();
                Pen pen = new Pen(Brushes.DarkGray, 0.5);
                pen.Freeze();
                meshLines.ForEach(line => drawingContext.DrawLine(pen, new System.Windows.Point(line.X1, line.Y1), new System.Windows.Point(line.X2, line.Y2)));
                drawingContext.Close();
    
                RenderTargetBitmap bmp = new RenderTargetBitmap(Convert.ToInt32(_ucCanvas.MainCanvas.ActualWidth), Convert.ToInt32(_ucCanvas.MainCanvas.ActualHeight), 96, 96, PixelFormats.Pbgra32);
                bmp.Render(drawingVisual);
                _floorImage = new System.Windows.Controls.Image();
                _floorImage.Source = bmp;
                _floorImage.Width = _ucCanvas.MainCanvas.ActualWidth;
                _floorImage.Height = _ucCanvas.MainCanvas.ActualHeight;
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  • 原文地址:https://www.cnblogs.com/xpvincent/p/3837940.html
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