WPF中从中心点到特定点的路径，ArcSegment计算

问题描述

我在XAML中定义了ArcSegment，在后面的代码中，我需要进行计算以从圆弧的中心点到特定的Y点获取Y值。请查看图片以更好地了解。

XAML

 <Canvas Name="canvas" Background="White" Opacity="99">
        <Path Stroke="Red" MouseLeftButtonDown="Path_MouseLeftButtonDown">
            <Path.Data>
                <PathGeometry>
                    <PathFigureCollection>
                        <PathFigure StartPoint="250,250">
                            <ArcSegment Size="70,70" IsLargeArc="True" SweepDirection="Counterclockwise" Point="250,200"/>
                        </PathFigure>
                    </PathFigureCollection>
                </PathGeometry>
            </Path.Data>
        </Path>
       
    </Canvas>

C＃

//I got this from StackOverflow maybe someone can figure out for the correct computation.
     private void Path_MouseLeftButtonDown(object sender,MouseButtonEventArgs e)
            {
                var curve = sender as Path;
                var geometry = curve.Data as PathGeometry;
                var figure = geometry.Figures.FirstOrDefault();
                var arcSegment = figure.Segments.FirstOrDefault() as ArcSegment;
                var xStart = figure.StartPoint.X;
                var yStart = figure.StartPoint.Y;
                var startAngle = arcSegment.Point.X;
                var sweepAngle = arcSegment.Point.Y;
                var Rx = arcSegment.Size.Width; // this is radius width
                var Ry = arcSegment.Size.Height;  // this is radius height
                var centerX = xStart - Rx * Math.Cos(startAngle);
                var centerY = yStart - Ry * Math.Sin(startAngle);
                var endAngle = startAngle + sweepAngle;
                var xEnd = centerX + Rx * Math.Cos(endAngle);
                var yEnd = centerY + Ry * Math.Sin(endAngle);
            }

屏幕截图

Output screenshot

解决方法

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wpf wpf wpf-controls