Xamarin如何绑定Arcsegment StartPoint

Question

我想为观察日期时间制作简单的圆图，但我无法将 arcsegment 的 StartPoint 绑定到自定义点。怎么绑定？

 private Point startPointer;
    public Point StartPointer
    {
        get { return startPointer; }
        set { startPointer = value; OnPropertyChanged("StartPointer"); }
    }
    private bool isTrue;

    public bool IsTrue
    {
        get { return isTrue; }
        set { isTrue = value; OnPropertyChanged("IsTrue"); }
    }

这些是我在 ViewModel 中的属性。

  <Path StrokeThickness="10">
                    <Path.Data>
                        <PathGeometry>
                           
                            <PathFigure StartPoint="{Binding  StartPointer, Mode=OneWay}">
                                <ArcSegment IsLargeArc="{Binding IsTrue}"  RotationAngle="-90" SweepDirection="Clockwise"
                       
                        Point="{Binding StartPointer,Mode=OneWay}" 
                        Size="40, 40">
                                </ArcSegment>
                            </PathFigure>
                        </PathGeometry>
                    </Path.Data>
                    <Path.Stroke>
                        <Color>blue</Color>
                    </Path.Stroke>
                </Path>

这是我需要绑定属性的 Arcsegment..

Answer 1

添加这个：

Source = {x:Reference viewmodel}