public static HSVColor RGBtoHSV(RGBColor rgb)
{
float max, min;
HSVColor hsv = new HSVColor();
min = Math.Min(Math.Min(rgb.R, rgb.G), rgb.B);
max = Math.Max(Math.Max(rgb.R, rgb.G), rgb.B);
hsv.V = max;
if (hsv.V < .0001f)
{
hsv.H = hsv.S = 0;
return hsv;
}
rgb.R /= hsv.V;
rgb.G /= hsv.V;
rgb.B /= hsv.V;
min = Math.Min(Math.Min(rgb.R, rgb.G), rgb.B);
max = Math.Max(Math.Max(rgb.R, rgb.G), rgb.B);
hsv.S = max - min;
if (hsv.S < .0001f)
{
hsv.H = 0;
return hsv;
}
rgb.R = (rgb.R - min) / (max - min);
rgb.G = (rgb.G - min) / (max - min);
rgb.B = (rgb.B - min) / (max - min);
min = Math.Min(Math.Min(rgb.R, rgb.G), rgb.B);
max = Math.Max(Math.Max(rgb.R, rgb.G), rgb.B);
if (Math.Abs(max - rgb.R) < .0001f)
{
hsv.H = 1f/6f * (rgb.G - rgb.B);
if (hsv.H < 0)
{
hsv.H += 1f;
}
}
else if (Math.Abs(max - rgb.G) < .0001f)
{
hsv.H = 2f/6f + 1f/6f * (rgb.B - rgb.R);
}
else /* rgb_max == rgb.b */
{
hsv.H = 4f/6f + 1f/6f * (rgb.R - rgb.G);
}
hsv.Alpha = rgb.Alpha;
return hsv;
}
public static RGBColor HSVtoRGB(HSVColor hsv)
{
float r, g, b;
float h, s, v;
r = g = b = 0;
h = hsv.H;
s = hsv.S;
v = hsv.V;
if (hsv.H > 1)
{
hsv.H = hsv.H - (float)Math.Floor(hsv.H); //Rounds down and gives us the remander
}
float chroma = hsv.V * hsv.S;
float hdash = hsv.H * 6f;
float x = chroma * (1f - Math.Abs((hdash % 2) - 1f));
if (hdash < 1f)
{
r = chroma;
g = x;
}
else if (hdash < 2f)
{
g = chroma;
r = x;
}
else if (hdash < 3f)
{
g = chroma;
b = x;
}
else if (hdash < 4f)
{
b = chroma;
g = x;
}
else if (hdash < 5f)
{
b = chroma;
r = x;
}
else if (hdash < 6f)
{
r = chroma;
b = x;
}
float min = hsv.V - chroma;
r += min;
g += min;
b += min;
return new RGBColor(r,g,b,hsv.Alpha);
}
