Show Radius of Ellipse - WPF

Question

I have an ellipse geometry. I want to show the radius of the ellipse by a line drawn from the center to the edge of the circle using C#. How can I achieve this?

Note: The center of the ellipse and the radius are not fixed and are defined by the user.

Answer 1

Suppose you have an ellipse with known center and radius:

        Path path = new Path();
        EllipseGeometry eg = new EllipseGeometry();
        eg.Center = new Point(left + side / 2, top + side / 2);
        eg.RadiusX = side / 2;
        eg.RadiusY = side / 2;
        path.Data = eg;
        paths.Add(path);
        canvas1.Children.Add(paths[paths.Count - 1]);
        .
        .
        path = new Path();
        borderColor.Color = Colors.Red;
        path.Stroke = borderColor;
        path.StrokeThickness = 2;
        LineGeometry r = new LineGeometry();
        r.StartPoint = eg.Center;
        r.EndPoint = new Point(eg.Center.X + eg.RadiusX, eg.Center.Y);
        path.Data = r;
        paths.Add(path);
        canvas1.Children.Add(paths[paths.Count - 1]);