public ColorD GetColor(double index, double maximum)
{
double z = index / maximum;
GradientColour(z, Grad, out double r, out double g, out double b, out double a);
return(ColorD.FromArgb(a, r, g, b));
}
static ColorD FindColorFromRange(double min, double max, double val)
{
//iterate HSL L=[0 to 1] S=1 H[0 to 360]
double range = max - min;
double spacemax = 256.0 * 360.0; //L * H
double pos = (val - min) / range * spacemax;
//basically map 2D HxL space into one dimension
double s = 1.0;
//double l = (pos / spacemax) * 0.9 + 0.05; //clip the edges by 5%
double l = pos / spacemax;
double h = (pos % (360.0 * 4)) / (360.0 * 4); //4 slows down the cycle 4x
ColorHelpers.HSLToRGB(h, s, l, out double r, out double g, out double b);
return(ColorD.FromArgb(1.0, r, g, b));
}
public ColorD GetColor(double index, double maximum)
{
double pct = Math.Log(1 + index) / Math.Log(1 + maximum);
return(ColorD.FromArgb(1.0, pct, pct, pct));
}