public static Color AdjustHSL(this Color c, int h, int s, int l, bool colorize = false)
{
var cc = (ColorRGB)c;
float hh = cc.H * 360, ss = cc.S * 100, ll = cc.L * 100;
if (colorize)
{
hh = h;
}
else
{
hh += h;
}
ss += s;
ll += l;
var hhh = clip((int)hh, 360, 0);
var sss = clip((int)ss, 100, 0);
var lll = clip((int)ll, 100, 0);
var rgb = ColorRGB.FromHSLA(hhh / 360.0, sss / 100.0, lll / 100.0, c.A);
return(rgb);
}
// 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(r * 255.0f);
rgb.G = Convert.ToByte(g * 255.0f);
rgb.B = Convert.ToByte(b * 255.0f);
rgb.A = Convert.ToByte(A * 255.0f);
return(rgb);
}
