protected Cairo.Color CalcValueColor(float val)
{
double factor = (val - valuesMin) / (valuesMax - valuesMin);
// should be able to handle division by zero (NaN)
return(coloring.GetColor(factor));
}
// must be able to handle double.NaN !
public System.Drawing.Color GetColor(double prop)
{
// can handle NaN, returns Cairo.Color, must convert to Drawing.Color
return(coloring.GetColor(prop).ToWinformsColor());
}