public static ColorARGB ToARGB(this ColorHSL hsl)
{
var rgb = new ColorARGB();
//shade of gray
if (hsl.S == 0)
{
rgb.R = (byte)(hsl.L * (double)byte.MaxValue);
rgb.G = (byte)(hsl.L * (double)byte.MaxValue);
rgb.B = (byte)(hsl.L * (double)byte.MaxValue);
return(rgb);
}
var temp1 = hsl.L < 0.5d
? hsl.L * (1d + hsl.S)
: hsl.L + hsl.S - hsl.L * hsl.S;
var temp2 = 2d * hsl.L - temp1;
var tempHue = hsl.H / 360d;
var tempR = tempHue + ONE_THIRD;
var tempG = tempHue;
var tempB = tempHue - ONE_THIRD;
tempR = tempR < 0 ? tempR + 1 : tempR > 1 ? tempR - 1 : tempR;
tempG = tempG < 0 ? tempG + 1 : tempG > 1 ? tempG - 1 : tempG;
tempB = tempB < 0 ? tempB + 1 : tempB > 1 ? tempB - 1 : tempB;
rgb.R = ColorChannelCalculation(temp1, temp2, tempR);
rgb.G = ColorChannelCalculation(temp1, temp2, tempG);
rgb.B = ColorChannelCalculation(temp1, temp2, tempB);
return(rgb);
}
public static ColorHSL ToHSL(this ColorARGB rgb)
{
var hsl = new ColorHSL();
var r = (double)rgb.R / (double)byte.MaxValue;
var g = (double)rgb.G / (double)byte.MaxValue;
var b = (double)rgb.B / (double)byte.MaxValue;
var max = new[] { r, g, b }.Max();
var min = new[] { r, g, b }.Min();
hsl.L = (max + min) / 2.0d;
//shade of gray
if (min == max)
{
return(hsl);
}
if (hsl.L <= 0.5d)
{
hsl.S = (double)(max - min) / (double)(max + min);
}
if (hsl.L > 0.5d)
{
hsl.S = (double)(max - min) / (double)(2d - max - min);
}
if (max == r)
{
hsl.H = (double)(g - b) / (double)(max - min);
}
if (max == g)
{
hsl.H = 2d + (double)(b - r) / (double)(max - min);
}
if (max == b)
{
hsl.H = 4d + (double)(r - g) / (double)(max - min);
}
hsl.H *= 60;
if (hsl.H < 0)
{
hsl.H += 360d;
}
return(hsl);
}
