I have arc in a canvas drawn from Path with the following details. I want to get Point(115,225). Please see screenshot to get more details. Please help me getting the formula to get to point (115,225).
startX=250
startY=250
ArcSegment Size (70,70)
ArcSegment Point (250,200)
Computation
var meanX=(startX+startX)/2-rX;//(250+250)/2-70=180
var meanY=(startY+ArcSegment.Point.Y)/2-rY;//(250+200)/2-70=225
//center Point (180,225)
//What is the formula if I want to get Point(115,225)
XAML
<Canvas Name="canvas" Background="White" Opacity="99">
<Path Stroke="Blue" MouseLeftButtonDown="Path_MouseLeftButtonDown" >
<Path.Data>
<PathGeometry>
<PathFigureCollection>
<PathFigure StartPoint="250,250" IsClosed="True">
<ArcSegment Size="70,70" IsLargeArc="True" SweepDirection="Clockwise" Point="250,200"/>
</PathFigure>
</PathFigureCollection>
</PathGeometry>
</Path.Data>
</Path>
</Canvas>
C#
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 startX = figure.StartPoint.X;
var yStart = figure.StartPoint.Y;
var startAngle = arcSegment.Point.X;
var sweepAngle = arcSegment.Point.Y;
var rX = arcSegment.Size.Width;
var rY = arcSegment.Size.Height;
var endAngle = startAngle + sweepAngle;
var meanX = (startX + startAngle) / 2 - rX;
var meanY = (yStart + sweepAngle) / 2 - rY;
}
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