internal static (double Hue, double Saturation, double Value) RgbToHsv(double red, double green, double blue)
{
var max = (red, green, blue).Max();
var min = (red, green, blue).Min();
var h = 0.0;
var s = 0.0;
var v = max;
if (NumberHelper.AreClose(max, min) == false)
{
if (NumberHelper.AreClose(max, red))
{
h = 60.0 / 360 * (green - blue) / (max - min);
}
else if (NumberHelper.AreClose(max, green))
{
h = 60.0 / 360 * (blue - red) / (max - min) + 120.0 / 360;
}
else if (NumberHelper.AreClose(max, blue))
{
h = 60.0 / 360 * (red - green) / (max - min) + 240.0 / 360;
}
s = (max - min) / max;
}
if (h < 0)
{
h += 1;
}
return(h, s, v);
}
internal static (double Red, double Green, double Blue) HsvToRgb(double hue, double saturation, double value)
{
var h = NumberHelper.AreClose(hue, 1) ? 0 : hue;
var s = saturation;
var v = value;
if (NumberHelper.AreCloseZero(s))
{
return(v, v, v);
}
var dh = Math.Floor(h / (60.0 / 360));
var p = v * (1 - s);
var q = v * (1 - s * (h / (60.0 / 360) - dh));
var t = v * (1 - s * (1 - (h / (60.0 / 360) - dh)));
return(dh switch
{
0 => (v, t, p),
1 => (q, v, p),
2 => (p, v, t),
3 => (p, q, v),
4 => (t, p, v),
5 => (v, p, q),
_ => throw new Exception()
});
internal static (double Red, double Green, double Blue) HsvToRgb(double hue, double saturation, double value)
{
var h = NumberHelper.AreClose(hue, 1)
? 0
: hue;
var s = saturation;
var v = value;
double r, g, b;
if (NumberHelper.AreCloseZero(s))
{
r = v;
g = v;
b = v;
}
else
{
var dh = Math.Floor(h / (60.0 / 360));
var p = v * (1 - s);
var q = v * (1 - s * (h / (60.0 / 360) - dh));
var t = v * (1 - s * (1 - (h / (60.0 / 360) - dh)));
switch (dh)
{
case 0:
r = v;
g = t;
b = p;
break;
case 1:
r = q;
g = v;
b = p;
break;
case 2:
r = p;
g = v;
b = t;
break;
case 3:
r = p;
g = q;
b = v;
break;
case 4:
r = t;
g = p;
b = v;
break;
case 5:
r = v;
g = p;
b = q;
break;
default:
throw new Exception();
}
}
return(r, g, b);
}
