public static IRGB hsv2rgb(float h, float s, float v)
{
s = s / 100f;
v = v / 100f;
float[] rgb;
float c = v * s;
float hh = h / 60;
float x = c * (1 - Math.Abs((hh % 2) - 1));
float m = v - c;
switch (Math.Floor(hh))
{
case 0:
rgb = new[] { c, x, 0 };
break;
case 1:
rgb = new[] { x, c, 0 };
break;
case 2:
rgb = new[] { 0, c, x };
break;
case 3:
rgb = new[] { 0, x, c };
break;
case 4:
rgb = new[] { x, 0, c };
break;
case 5:
rgb = new[] { c, 0, x };
break;
default:
throw new NotSupportedException();
}
return(new Color
{
r = (int)Shades.Round(MAX_COLOR_RGBA * (rgb[0] + m)),
g = (int)Shades.Round(MAX_COLOR_RGBA * (rgb[1] + m)),
b = (int)Shades.Round(MAX_COLOR_RGBA * (rgb[2] + m))
});
}
public static IHSV rgb2hsv(int r, int g, int b)
{
float h = float.NaN;
float s;
float v;
float max = Math.Max(Math.Max(r, g), b);
float min = Math.Min(Math.Min(r, g), b);
float delta = max - min;
// hue
if (delta == 0)
{
h = 0;
}
else if (r == max)
{
h = ((g - b) / delta) % 6;
}
else if (g == max)
{
h = (b - r) / delta + 2;
}
else if (b == max)
{
h = (r - g) / delta + 4;
}
h = Shades.Round(h * 60);
if (h < 0)
{
h += 360;
}
// saturation
s = Shades.Round((max == 0 ? 0 : delta / max) * 100);
// value
v = Shades.Round((max / 255) * 100);
return(new Color
{
h = h,
s = s,
v = v
});
}