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Editorial Team
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Asked: 2026-05-17T03:06:22+00:00

Here’s an example image of what I mean: example The gray rectangle is the

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Here’s an example image of what I mean: example

The gray rectangle is the bounding box of a control that draws the blue lines and dots in it’s OnRender(...) method. The red ovals mark places where it happens.

  • Why is that possible?
  • How can it be avoided?
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1 Answer

  1. Editorial Team

    https://msdn.microsoft.com/en-us/library/ms750441(v=vs.100).aspx has detailed information about the architectural design of WPF to answer why it is possible.

    To avoid it you want to use the clip property of your element.

     <Rectangle Fill="Yellow" Height="100" Width="200" StrokeThickness="2" Stroke="Black">
   <Rectangle.Clip>
     <EllipseGeometry Center="200,100" RadiusX="50" RadiusY="50" />
   </Rectangle.Clip>
 </Rectangle>

    Check out http://msdn.microsoft.com/en-us/library/cc189065%28v=VS.95%29.aspx for more details.

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