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<Ellipse Width="50" Height="50" Fill="Red" x:Name="ellipse" RenderTransformOrigin="0.5,0.5">
<Ellipse.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="0.5" ScaleY="0.5"/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</Ellipse.RenderTransform>
</Ellipse>
<Window.Resources>
<Storyboard x:Key="Storyboard">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="ellipse"
Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)">
<EasingDoubleKeyFrame KeyTime="00:00:05" Value="2"/>
<EasingDoubleKeyFrame KeyTime="00:00:10" Value="1"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="ellipse"
Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)">
<EasingDoubleKeyFrame KeyTime="00:00:05" Value="2"/>
<EasingDoubleKeyFrame KeyTime="00:00:10" Value="1"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</Window.Resources>
嫌写xaml麻烦就用blend画。