/// <summary>
/// Converts a color into a HSV object
/// </summary>
/// <param name="rgb"></param>
/// <returns></returns>
public static HSV FromColor(Color rgb)
{
HSV hsl = new HSV();
hsl.H = 0; // default to black
hsl.S = 0;
hsl.V = 0;
hsl.A = (double)rgb.A / 255.0;
double deg1 = 1.0 / 360.0;
double h = 0.0;
ColorPair r = new ColorPair()
{
val = (double)rgb.R / 255.0, channel = "R"
};
ColorPair g = new ColorPair()
{
val = (double)rgb.G / 255.0, channel = "G"
};
ColorPair b = new ColorPair()
{
val = (double)rgb.B / 255.0, channel = "B"
};
ColorPair[] values = new ColorPair[] { r, g, b };
ColorPair max = values.OrderByDescending(v => v.val).First();
ColorPair min = values.OrderBy(v => v.val).First();
if (min.channel == max.channel)
{
h = 0;
}
else
{
switch (max.channel)
{
case "R":
h = 60 * deg1 * (0 + (g.val - b.val) / (max.val - min.val));
break;
case "G":
h = 60 * deg1 * (2 + (b.val - r.val) / (max.val - min.val));
break;
case "B":
h = 60 * deg1 * (4 + (r.val - g.val) / (max.val - min.val));
break;
default:
h = 0;
break;
}
}
if (h < 0)
{
h += 1;
}
hsl.H = h;
if (max.val == 0)
{
hsl.S = 0;
}
else
{
hsl.S = (max.val - min.val) / max.val;
}
hsl.V = max.val;
return(hsl);
}
