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POHow to properly refresh a custom shape in WPF?
 

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  1. POHow to properly refresh a custom shape in WPF?
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    <p>I created a custom line with some text next to it. The shape is a subclass of <code>System.Windows.Shapes.Shape</code>. For some reason the text does not refresh when I change the coordinates for the line. I know about the <code>InvalidateVisual()</code> approach, but then every time I move elements around I would have to call it to redraw the shape. I am sure there is a better way of doing it. What am I doing wrong? ATM I am out of ideas.</p> <pre><code>public class MyShape : Shape { LineGeometry line; FormattedText text; public MyShape() { line = new LineGeometry(); text = new FormattedText( Edge.Length.ToString(), Thread.CurrentThread.CurrentCulture, System.Windows.FlowDirection.LeftToRight, new Typeface("Verdana"), 10, Brushes.Black); } // Specify the X1 dependency property: public static readonly DependencyProperty X1Property = DependencyProperty.Register("X1", typeof(double), typeof(MyShape), new FrameworkPropertyMetadata(0.0, FrameworkPropertyMetadataOptions.AffectsMeasure)); public double X1 { set { SetValue(X1Property, value); } get { return (double)GetValue(X1Property); } } // Specify the Y1 dependency property: public static readonly DependencyProperty Y1Property = DependencyProperty.Register("Y1", typeof(double), typeof(MyShape), new FrameworkPropertyMetadata(0.0, FrameworkPropertyMetadataOptions.AffectsMeasure)); public double Y1 { set { SetValue(Y1Property, value); } get { return (double)GetValue(Y1Property); } } /*Some other Dependency Properties.... and*/ protected override Geometry DefiningGeometry { get { GeometryGroup geometryGroup = new GeometryGroup(); line.StartPoint = new Point(X1, Y1); line.EndPoint = new Point(X2, Y2); text.SetFontWeight(FontWeights.ExtraLight); Geometry geometry = text.BuildGeometry(new Point((X1 + X2) / 2, (Y1 + Y2) / 2)); geometryGroup.Children.Add(geometry); geometryGroup.Children.Add(line); return geometryGroup; } } } </code></pre>
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