public static System.Drawing.Color BrightnessChange(this System.Drawing.Color color, double Brightness)
{
var c = ToHSL(color);
var lc = MathTool.Map(MathTool.Constrain(Brightness, -1, 1), -1, 1, 0, 1);
c.L = lc;
return(c.ToRGB());
}
public static System.Drawing.Color BrightnessTransmit(this System.Drawing.Color color, double Brightness)
{
var c = ToHSL(color);
var lc = MathTool.Constrain(c.L * Brightness, -1, 1);
c.L = MathTool.Constrain(c.L + lc, 0, 1);
return(c.ToRGB());
}
public System.Drawing.Color ToRGB()
{
var hue = MathTool.Constrain(H, 0, 360);
var saturation = MathTool.Constrain(S, 0, 1);
var value = MathTool.Constrain(V, 0, 1);
var alpha = MathTool.Constrain(A, 0, 1);
double chroma = value * saturation;
double h1 = hue / 60.0;
double x = chroma * (1.0 - Math.Abs((h1 % 2.0) - 1.0));
double m = value - chroma;
double r1, g1, b1;
if (h1 < 1)
{
r1 = chroma;
g1 = x;
b1 = 0;
}
else if (h1 < 2)
{
r1 = x;
g1 = chroma;
b1 = 0;
}
else if (h1 < 3)
{
r1 = 0;
g1 = chroma;
b1 = x;
}
else if (h1 < 4)
{
r1 = 0;
g1 = x;
b1 = chroma;
}
else if (h1 < 5)
{
r1 = x;
g1 = 0;
b1 = chroma;
}
else
{
r1 = chroma;
g1 = 0;
b1 = x;
}
byte r = (byte)Math.Round(255.0 * (r1 + m));
byte g = (byte)Math.Round(255.0 * (g1 + m));
byte b = (byte)Math.Round(255.0 * (b1 + m));
byte a = (byte)Math.Round(255.0 * alpha);
return(System.Drawing.Color.FromArgb(a, r, g, b));
}