中心绘制椭圆原点

设置 RenderTransformOrigin 属性,而不设置 RenderTransform 这没有任何效果。

您可能想要做的是使用 EllipseGeometry 而不是椭圆:

var impact = new Path
{
    Data = new EllipseGeometry(new Point(25, 25), 25, 25),
    StrokeThickness = 1.5,
    Stroke = Brushes.Black
};

MainCanvas.Children.Add(impact);

Storyboard story = new Storyboard();
DoubleAnimation anim1 = new DoubleAnimation(0, 30, TimeSpan.FromSeconds(0.9));
DoubleAnimation anim2 = new DoubleAnimation(0, 30, TimeSpan.FromSeconds(0.9));
DoubleAnimation anim3 = new DoubleAnimation(1, 0, TimeSpan.FromSeconds(0.9));

Storyboard.SetTargetProperty(anim1, new PropertyPath("Data.RadiusX"));
Storyboard.SetTargetProperty(anim2, new PropertyPath("Data.RadiusY"));
Storyboard.SetTargetProperty(anim3, new PropertyPath("Opacity"));

story.Children.Add(anim1);
story.Children.Add(anim2);
story.Children.Add(anim3);

impact.BeginStoryboard(story);

现在可以调整椭圆几何的中心和半径,以获得所需效果。也不清楚为什么圆以半径25开始,以便立即从0到30设置动画。