How do you get the end cap width or height values for line objects?

Does anybody know how you can get the endcap width or height values for a line object in C# WPF? Please assume we are using the round endcap (PenLineCap.Round), would like to figure this as a percentage of the line width or som开发者_开发百科e other ratio that would allow me to know the size in pixels of the endcap at any given time. Thanks all.

If you are using a PenLineCap.Round end cap on a WPF line, the line's StrokeThickness will determine the size of the end cap.