不确定我是否正确地满足了您的要求,
但这就是你要找的吗?
如果是这样,您不需要我的评论中的链接。你可以选择:
<Storyboard x:Key="SomeStoryboard"
AutoReverse="True"
RepeatBehavior="Forever">
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="textBlock"
Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)">
<EasingDoubleKeyFrame KeyTime="0:0:1"
Value="-1" />
</DoubleAnimationUsingKeyFrames>
</Storyboard>
...
<TextBlock x:Name="textBlock"
HorizontalAlignment="Left"
RenderTransformOrigin="0.5,0.5"
Text="Some random text">
<TextBlock.RenderTransform>
<TransformGroup>
<ScaleTransform />
<SkewTransform />
<RotateTransform />
<TranslateTransform />
</TransformGroup>
</TextBlock.RenderTransform>
</TextBlock>