WPF Color interpolation

Question

I am trying to paint a WPF control\'s background based on a palette where each color has been assigned with values (e.g. Red = 0, DarkGreen = 10, Green = 20,LightGreen =30)

Answer 1

Thanks for all the replies guys. It seems there is no way to get the "value" of a GradientBrush at a specified point. I hope this is corrected at some later version of the framework. So I guess the only option for now is to implement an interpolation algorithm as Mikko suggested.