C# 如何围绕椭圆中心旋转弧段

我有两种形状：一个椭圆和一个圆。我想绕着椭圆的中心旋转这个圆

<Path Stroke="Indigo" StrokeThickness="3" RenderTransformOrigin="0.5,0.5"
      Data="M 50 50 A 50 50 0 0 0 42.5 26.2">
      <Path.RenderTransform>
           <RotateTransform Angle="270"/>
      </Path.RenderTransform>
</Path>
<Ellipse Stroke="Black" Width="50" Height="50"/>

这是我想要的

---

首先确保两个形状使用相同的坐标系。您可以在公共画布父对象中绘制两个路径，一个为

椭圆几何体

，另一个为

路径几何体

。画布的左上角定义了坐标原点

<Canvas Margin="100">
    <Path Stroke="Black">
        <Path.Data>
            <EllipseGeometry RadiusX="50" RadiusY="50"/>
        </Path.Data>
    </Path>
    <Path Stroke="LightBlue" StrokeThickness="5">
        <Path.Data>
            <PathGeometry>
                <PathFigure StartPoint="0,-50">
                    <ArcSegment Point="42.5,-26.2" Size="50,50"
                                IsLargeArc="False" SweepDirection="Clockwise"/>
                </PathFigure>
                <PathGeometry.Transform>
                    <RotateTransform Angle="15"/>
                </PathGeometry.Transform>
            </PathGeometry>
        </Path.Data>
    </Path>
</Canvas>

或者不明确命名旋转变换：

<Path Stroke="LightBlue" StrokeThickness="5">
    <Path.Data>
        <PathGeometry>
            <PathFigure StartPoint="0,-50">
                <ArcSegment Point="42.5,-26.2" Size="50,50"
                            IsLargeArc="False" SweepDirection="Clockwise"/>
            </PathFigure>
            <PathGeometry.Transform>
                <RotateTransform/>
            </PathGeometry.Transform>
        </PathGeometry>
    </Path.Data>
    <Path.Triggers>
        <EventTrigger RoutedEvent="Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation
                        Storyboard.TargetProperty="Data.Transform.Angle"
                        To="360" Duration="0:0:2" RepeatBehavior="Forever"/>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Path.Triggers>
</Path>

您的问题不清楚您是否真的想要设置圆弧段的动画，或者可能只是将其设置为“代码隐藏”中的某个值。你只是想要一个永远运行的动画吗？是的，我知道如何从代码隐藏中完成。谢谢！我正在尝试从xaml添加故事板。.有问题。哦，我可以用Data.Transform.Angle.Awsome！我明白了

<Path Stroke="LightBlue" StrokeThickness="5">
    <Path.Data>
        <PathGeometry>
            <PathFigure StartPoint="0,-50">
                <ArcSegment Point="42.5,-26.2" Size="50,50"
                            IsLargeArc="False" SweepDirection="Clockwise"/>
            </PathFigure>
            <PathGeometry.Transform>
                <RotateTransform/>
            </PathGeometry.Transform>
        </PathGeometry>
    </Path.Data>
    <Path.Triggers>
        <EventTrigger RoutedEvent="Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation
                        Storyboard.TargetProperty="Data.Transform.Angle"
                        To="360" Duration="0:0:2" RepeatBehavior="Forever"/>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Path.Triggers>
</Path>