How to convert a System.Drawing.Drawing2D.LinearGradientBrush to a System.Windows.Media.LinearGradientBrush ?

Question

I trying to port System.Drawing: public LinearGradientBrush( Rectangle rect, Color color1, Color color2, float angle ) to System.Windows.Media . I can get the angle to be correct but I can't get the start and end to be at the corners. I have tried scaling the brush's transform but that ends up messing the angle.

System.Drawing.Drawing2D.LinearGradientBrush: http://msdn.microsoft.com/en-us/library/ms142563.aspx

System.Windows.Media.LinearGradientBrush: http://msdn.microsoft.com/en-us/library/ms602517.aspx

Answer 1

The corners are good, the gamma correction looks different. The WPF LinearGradientBrush indeed has a GammaCorrection property. Play with it.

Answer 2

I am calculating my start and end points using the intersection of the gradient axis (red line) and the line (blue) perpendicular to the gradient axis that also intersects a corner of the rectangle.