C# 如何将偏移设置为SpringVector3NaturalMotionAnimation？

如何设置SpringVector3自然运动动画的偏移点？使用以下代码，动画效果良好，但我无法将偏移点设置为FrameworkElement的中间。现在偏移位于左上角

       private static void ScaleAnimation_Internal(FrameworkElement TargetFrameworkElement, int ScaleInProsents, TimeSpan Duration, TimeSpan Delay, int DampingRatioProsent)
        {
            AnimationClass TargetAnimationClass = AddScaleAnimation(TargetFrameworkElement);
            Compositor TargetCompositor = Window.Current.Compositor;
            //UPDATE
            TargetAnimationClass.TargetSpringVector3NaturalMotionAnimation.FinalValue = new Vector3((float)ScaleInProsents / 100);
            if (Duration != TimeSpan.Zero) TargetAnimationClass.TargetSpringVector3NaturalMotionAnimation.Period = Duration;
            if (Delay != TimeSpan.Zero) TargetAnimationClass.TargetSpringVector3NaturalMotionAnimation.DelayTime = Delay;
            if (DampingRatioProsent >= 0) TargetAnimationClass.TargetSpringVector3NaturalMotionAnimation.DampingRatio = (float)DampingRatioProsent / 100;
            //START ANIMATION
            TargetFrameworkElement.StartAnimation(TargetAnimationClass.TargetSpringVector3NaturalMotionAnimation);
        }

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正如@Johnny Westlake所说，您只需在调用StartAnimation之前设置中心点。比如说

Compositor _compositor = Window.Current.Compositor;
SpringVector3NaturalMotionAnimation _springAnimation;

private void Btn_PointerEntered(object sender, PointerRoutedEventArgs e)
{
    CreateOrUpdateSpringAnimation(1.5f);
    (sender as UIElement).CenterPoint = new Vector3((float)(Btn.ActualWidth / 2.0), (float)(Btn.ActualHeight / 2.0), 1f);
    (sender as UIElement).StartAnimation(_springAnimation);

}

private void Btn_PointerExited(object sender, PointerRoutedEventArgs e)
{
    CreateOrUpdateSpringAnimation(1.0f);
    (sender as UIElement).CenterPoint = new Vector3((float)(Btn.ActualWidth / 2.0), (float)(Btn.ActualHeight / 2.0), 1f);
    (sender as UIElement).StartAnimation(_springAnimation);


}
private void CreateOrUpdateSpringAnimation(float finalValue)
{
    if (_springAnimation == null)
    {
        _springAnimation = _compositor.CreateSpringVector3Animation();
        _springAnimation.Target = "Scale";

    }

    _springAnimation.FinalValue = new Vector3(finalValue);
}

Xaml代码

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我检查了SpringVector3NaturalMotionAnimation类，没有这样的api设置偏移点。这是一个全新的api。对于相同的方法，您可以使用社区工具包缩放。在与TargetFrameworkElementThanx、Nico Zhu关联的视觉上设置中心点！您的代码示例简单明了，并且可以正常工作！我试图解决这个问题太难了，就像火箭科学一样。我只是没有意识到要使用CentrePoint。。。

<Grid>
    <Button Name="Btn" Content="ClickMe" 
            PointerEntered="Btn_PointerEntered"
            PointerExited="Btn_PointerExited"
           VerticalAlignment="Center" HorizontalAlignment="Center" >

    </Button>
</Grid>