ControlTemplate not working as intended

Question

I am creating some custom SimpleMarkerSymbol to be displayed on a GraphicsLayer. All I want is to display a marker with a black stroke (like shown in the attached shot) and indifferent shapes ("X", arrows, squares, rectangles and so on). I worked out the part of the black stroke in the ControlTemplate, so that is good. For the different shapes, I extended the "Shape" class from Microsoft and created my stuff. That all looks good except for one part. Our application has a slider that allows the user to increase/decrease the size of these Markers. My solution works well when I use the out of the box Ellipse; meaning that I can see the resizing happening and the bubbles increase/decrease in size and stay at the location defined by the MapPoint. However, when I do one of my Custom shapes and move the slider the Marker moves positions and does not changes size until I get it out of the viewing area and back in. Here is what I have for the Ellipse ControlTemplate (the one that WORKS fine): And this is what I have for my Arrow custom shape (the one that DOES NOT work). Basically the same thing but instead of the ellipse I have my Arrow class: And this is the extension of the Shape class, simply called Arrow:public class Arrow : Shape { public Arrow() { } public static readonly DependencyProperty SizeProperty = DependencyProperty.Register("Size", typeof(Double), typeof(Arrow)); public static readonly DependencyProperty RotationAngleProperty = DependencyProperty.Register("RotationAngle", typeof(Double), typeof(Arrow), new PropertyMetadata(0.0d)); public double Size { get { return (double)this.GetValue(SizeProperty); } set { this.SetValue(SizeProperty, value); } } public double RotationAngle { get { return (double)this.GetValue(RotationAngleProperty); } set { this.SetValue(RotationAngleProperty, value); } } protected override Geometry DefiningGeometry { get { double oneThird = this.Size / 3; double twoThirds = (this.Size * 2) / 3; double oneHalf = this.Size / 2; Point p1 = new Point(0.0d, oneThird); Point p2 = new Point(0.0d, twoThirds); Point p3 = new Point(oneHalf, twoThirds); Point p4 = new Point(oneHalf, this.Size); Point p5 = new Point(this.Size, oneHalf); Point p6 = new Point(oneHalf, 0); Point p7 = new Point(oneHalf, oneThird); List segments = new List(3); segments.Add(new LineSegment(p1, true)); segments.Add(new LineSegment(p2, true)); segments.Add(new LineSegment(p3, true)); segments.Add(new LineSegment(p4, true)); segments.Add(new LineSegment(p5, true)); segments.Add(new LineSegment(p6, true)); segments.Add(new LineSegment(p7, true)); List figures = new List(1); PathFigure pf = new PathFigure(p1, segments, true); figures.Add(pf); RotateTransform rt = new RotateTransform(this.RotationAngle); Geometry g = new PathGeometry(figures, FillRule.EvenOdd, rt); return g; } } } I already changed the RenderTransformOrigin="0.5,0.5" position in the ControlTemplate and it still looks like it is moving to a different position. I also tried setting up the RotateTransform CenterX and CenterY variables to fixed points and did not work either. What am I missing? a Listener for the size? Marker.jpg Cropped_Brass.jpg

DanielWalton · Accepted Answer

I don't see how your Size DP connects to your DefiningGeometry. You should define the Size change handler to update it.