public static Color HslToRgb(HSL hsl)
{
hsl.H = hsl.H / 360d;
Color rgb = new Color();
double hue = hsl.H;
double saturation = hsl.S;
double lightness = hsl.L;
rgb.A = 255;
if (saturation == 0)
{
rgb.R = rgb.G = rgb.B = (byte)(lightness * 255);
}
else
{
double tmp1, tmp2;
if (lightness < 0.5)
{
tmp2 = lightness * (1d + saturation);
}
else
{
tmp2 = (lightness + saturation) - (saturation * lightness);
}
tmp1 = 2 * lightness - tmp2;
rgb.R = (byte)Math.Round(255 * Hue2Rgb(tmp1, tmp2, hue + (1d / 3d)));
rgb.G = (byte)Math.Round(255 * Hue2Rgb(tmp1, tmp2, hue));
rgb.B = (byte)Math.Round(255 * Hue2Rgb(tmp1, tmp2, hue - (1d / 3d)));
}
return(rgb);
}
public static HSL RgbToHsl(Color color)
{
double r = color.R;
double g = color.G;
double b = color.B;
double hue = 0;
if ((r >= g) && (g >= b))
{
hue = 60 * (g - b) / (r - b);
}
else if ((g > r) && (r >= b))
{
hue = 60 * (2 - (r - b) / (g - b));
}
else if ((g >= b) && (b > r))
{
hue = 60 * (2 + (b - r) / (g - r));
}
else if ((b > g) && (g > r))
{
hue = 60 * (4 - (g - r) / (b - r));
}
else if ((b > r) && (r >= g))
{
hue = 60 * (4 + (r - g) / (b - g));
}
else if ((r >= b) && (b > g))
{
hue = 60 * (6 - (b - g) / (r - g));
}
r = r / 255d;
g = g / 255d;
b = b / 255d;
double var_Min = Math.Min(Math.Min(r, g), b);
double var_Max = Math.Max(Math.Max(r, g), b);
double del_Max = var_Max - var_Min;
double l = ((var_Max + var_Min) / 2.0);
double s;
if (del_Max == 0)
{
hue = s = 0;
}
else
{
if (l < 0.5)
{
s = del_Max / (var_Max + var_Min);
}
else
{
s = (del_Max / (2.0 - var_Max - var_Min));
}
}
HSL result = new HSL(hue, s, l);
return(result);
}