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Editorial Team
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Asked: 2026-05-12T16:59:05+00:00

I need a way to combine multiple EllipseGeometry to make a union between them,

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I need a way to combine multiple EllipseGeometry to make a union between them, but CombineGeometry class only can combine 2 Geometries.
The ideal way is to have a class similar CombineGeometry that accepts more than Geometry1 and Geometry2 shapes.
Anyone knows an object that makes such a behaviour?

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1 Answer

  1. Editorial Team

    EllipseGeometry is a Geometry too so you can combine like this:

      <CombinedGeometry GeometryCombineMode="Union">
       <CombinedGeometry.Geometry1>
            <EllipseGeometry RadiusX="70" RadiusY="30" Center="100,150"  />
       </CombinedGeometry.Geometry1>
       <CombinedGeometry.Geometry2>
            <EllipseGeometry RadiusX="70" RadiusY="30" Center="200,150" />
       </CombinedGeometry.Geometry2>
  </CombinedGeometry>

    EDIT
    To combine three or more EllipseGeometries you could use this mechanism

    <CombinedGeometry   GeometryCombineMode="Union">
    <CombinedGeometry.Geometry1>
        <CombinedGeometry GeometryCombineMode="Union">
              <CombinedGeometry.Geometry1>
                    <EllipseGeometry RadiusX="70" RadiusY="30" Center="100,150"  />
              </CombinedGeometry.Geometry1>
              <CombinedGeometry.Geometry2>
                    <EllipseGeometry RadiusX="70" RadiusY="30" Center="200,150" />
              </CombinedGeometry.Geometry2>
        </CombinedGeometry>
    </CombinedGeometry.Geometry1>
    <CombinedGeometry.Geometry2>
           <EllipseGeometry RadiusX="70" RadiusY="30" Center="100,150"  />
    </CombinedGeometry.Geometry2>
</CombinedGeometry>

    You can create a new class that is derived from Geometry and have a Geometry[] in it and implement methods using above mechanism.

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