// Given H,S,L,A in range of 0-1
// Returns a Color (RGB struct) in range of 0-255
public static ColorRGB FromHSLA(double H, double S, double L, double A)
{
double v;
double r, g, b;
if (A > 1.0)
{
A = 1.0;
}
r = L; // default to gray
g = L;
b = L;
v = (L <= 0.5) ? (L * (1.0 + S)) : (L + S - L * S);
if (v > 0)
{
double m;
double sv;
int sextant;
double fract, vsf, mid1, mid2;
m = L + L - v;
sv = (v - m) / v;
H *= 6.0;
sextant = (int)H;
fract = H - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0:
r = v;
g = mid1;
b = m;
break;
case 1:
r = mid2;
g = v;
b = m;
break;
case 2:
r = m;
g = v;
b = mid1;
break;
case 3:
r = m;
g = mid2;
b = v;
break;
case 4:
r = mid1;
g = m;
b = v;
break;
case 5:
r = v;
g = m;
b = mid2;
break;
}
}
ColorRGB rgb = new ColorRGB();
rgb.R = Convert.ToByte(Math.Max(0, r * 255.0f));
rgb.G = Convert.ToByte(Math.Max(0, g * 255.0f));
rgb.B = Convert.ToByte(Math.Max(0, b * 255.0f));
rgb.A = Convert.ToByte(Math.Max(0, A * 255.0f));
return(rgb);
}
public static ColorF FromHSLA(double H, double S, double L, double A)
{
return((ColorF)(Color)ColorRGB.FromHSLA(H, S, L, A));
}
// Given H,S,L,A in range of 0-1
// Returns a Color (RGB struct) in range of 0-255
public static ColorRGB FromHSLA(double H, double S, double L, double A)
{
double v;
double r, g, b;
if (A > 1.0)
A = 1.0;
r = L; // default to gray
g = L;
b = L;
v = (L <= 0.5) ? (L * (1.0 + S)) : (L + S - L * S);
if (v > 0)
{
double m;
double sv;
int sextant;
double fract, vsf, mid1, mid2;
m = L + L - v;
sv = (v - m) / v;
H *= 6.0;
sextant = (int)H;
fract = H - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0:
r = v;
g = mid1;
b = m;
break;
case 1:
r = mid2;
g = v;
b = m;
break;
case 2:
r = m;
g = v;
b = mid1;
break;
case 3:
r = m;
g = mid2;
b = v;
break;
case 4:
r = mid1;
g = m;
b = v;
break;
case 5:
r = v;
g = m;
b = mid2;
break;
}
}
ColorRGB rgb = new ColorRGB();
rgb.R = Convert.ToByte(Math.Max(0, r * 255.0f));
rgb.G = Convert.ToByte(Math.Max(0, g * 255.0f));
rgb.B = Convert.ToByte(Math.Max(0, b * 255.0f));
rgb.A = Convert.ToByte(Math.Max(0, A * 255.0f));
return rgb;
}
