How to: Animate a Clip Region

How to: Animate a Clip Region

This example shows how animate a framework element's Clip region. In the following example, an EllipseGeometry is used to define an elliptical clip region for an Image element. A PointAnimation animates the ellipse geometry's Center property from (0, 0) to (200, 150). The animation starts playing after the image is loaded and repeats indefinitely.

<Image
  Source="sampleImages\Waterlilies.jpg" 
  Width="200" Height="150" HorizontalAlignment="Left">
  <Image.Clip>
    <EllipseGeometry x:Name="MyEllipseGeometry1"
      RadiusX="100"
      RadiusY="75"
      Center="100,75"/>
  </Image.Clip>
  <Image.Triggers>
    <EventTrigger RoutedEvent="Image.Loaded">
      <BeginStoryboard>
        <Storyboard>
          <PointAnimation 
            Storyboard.TargetName="MyEllipseGeometry1" 
            Storyboard.TargetProperty="(EllipseGeometry.Center)"
            From="0,0" To="200,150" Duration="0:0:3" RepeatBehavior="Forever" 
            AutoReverse="True" />
          </Storyboard>
      </BeginStoryboard>
    </EventTrigger>
  </Image.Triggers>
</Image> 

For the full sample, see the Clip Region Sample.

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