public static HslColor FromRgb(byte R, byte G, byte B)
{
HslColor c = new HslColor();
c.A = 1;
double r = ByteToPct(R);
double g = ByteToPct(G);
double b = ByteToPct(B);
double max = Math.Max(b, Math.Max(r, g));
double min = Math.Min(b, Math.Min(r, g));
if (max == min)
{
c.H = 0;
}
else if (max == r && g >= b)
{
c.H = 60 * ((g - b) / (max - min));
}
else if (max == r && g < b)
{
c.H = 60 * ((g - b) / (max - min)) + 360;
}
else if (max == g)
{
c.H = 60 * ((b - r) / (max - min)) + 120;
}
else if (max == b)
{
c.H = 60 * ((r - g) / (max - min)) + 240;
}
c.L = .5 * (max + min);
if (max == min)
{
c.S = 0;
}
else if (c.L <= .5)
{
c.S = (max - min) / (2 * c.L);
}
else if (c.L > .5)
{
c.S = (max - min) / (2 - 2 * c.L);
}
return c;
}
public HslColor Lighten(double pct)
{
HslColor c = new HslColor();
c.A = this.A;
c.H = this.H;
c.S = this.S;
c.L = Math.Min(Math.Max(this.L + pct, 0), 1);
return c;
}
