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POStreamGeometry not getting rasterized when the Pen has DashStyle other than Null
 

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  1. POStreamGeometry not getting rasterized when the Pen has DashStyle other than Null
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    <p>I was trying to create a brush that draws a geometry. Everything worked fine until I tried to add Dashing to the shape.</p> <p>I found that when I create the geometry using Geometry.Parse, the dashed line appears correctly, but when I create it directly using StreamGeometryContext, nothing gets rendered. </p> <p>This is the code I'm using:</p> <pre><code>private void RenderGeometryAndSetAsBackground() { Point startPoint = new Point(3505961.52400725, 3281436.57325874); Point[] points = new Point[] { new Point(3503831.75515445,3278705.9649394), new Point(3503905.74802898,3278449.37713916), new Point(3507242.57331039,3276518.41148474), new Point(3507700.6914325,3276536.23547958), new Point(3510146.73449577,3277964.12812859), new Point(3509498.96473447,3278678.60178448), new Point(3507412.1889951,3277215.64022219), new Point(3504326.22698001,3278682.85514017), new Point(3506053.34789057,3281390.66371786)}; string geom = "M3505961.52400725,3281436.57325874L3503831.75515445,3278705.9649394 3503905.74802898,3278449.37713916 3507242.57331039,3276518.41148474 3507700.6914325,3276536.23547958 3510146.73449577,3277964.12812859 3509498.96473447,3278678.60178448 3507412.1889951,3277215.64022219 3504326.22698001,3278682.85514017 3506053.34789057,3281390.66371786"; //Geometry geometry = StreamGeometry.Parse(geom); StreamGeometry geometry = new StreamGeometry(); using (StreamGeometryContext sgc = geometry.Open()) { sgc.BeginFigure(startPoint, false, true); foreach (Point p in points) { sgc.LineTo(p, true, true); } } Pen pen = new Pen(Brushes.Yellow, 3); pen.DashStyle = new DashStyle(new double[] { 30, 30 }, 0); //GeometryDrawing gd = new GeometryDrawing(null, pen, path.RenderedGeometry); GeometryDrawing gd = new GeometryDrawing(null, pen, geometry); DrawingBrush drawingBrush = new DrawingBrush(gd); DrawingBrush tile = drawingBrush.Clone(); tile.Viewbox = new Rect(0.5, 0, 0.25, 0.25); RenderTargetBitmap rtb = new RenderTargetBitmap(256, 256, 96, 96, PixelFormats.Pbgra32); var drawingVisual = new DrawingVisual(); using (DrawingContext context = drawingVisual.RenderOpen()) { context.DrawRectangle(tile, null, new Rect(0, 0, 256, 256)); } rtb.Render(drawingVisual); ImageBrush bgBrush = new ImageBrush(rtb); Background = bgBrush; } </code></pre> <p>When done that way, nothing is getting drawn. If I don't use dashing (or set the dashing to null) it works fine. It also works if I use the <code>StreamGeometry.Parse(geom)</code> and keeps the dashing.</p> <p>Trying to call <code>sgc.Close()</code> didn't help. Currently my only workaround is to call:</p> <pre><code>geometry = Geometry.Parse(geometry.ToString()); </code></pre> <p>which is not very nice...</p> <p>What am I missing? </p>
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