/// <summary>
/// RGB转换HSV
/// </summary>
/// <param name="rgb"></param>
/// <returns></returns>
internal static ColorHSV RgbToHsv(ColorRGB rgb)
{
float min, max, tmp, H, S, V;
float R = rgb.R * 1.0f / 255, G = rgb.G * 1.0f / 255, B = rgb.B * 1.0f / 255;
tmp = Math.Min(R, G);
min = Math.Min(tmp, B);
tmp = Math.Max(R, G);
max = Math.Max(tmp, B);
// H
H = 0;
if (max == min)
{
H = 0;
}
else if (max == R && G > B)
{
H = 60 * (G - B) * 1.0f / (max - min) + 0;
}
else if (max == R && G < B)
{
H = 60 * (G - B) * 1.0f / (max - min) + 360;
}
else if (max == G)
{
H = H = 60 * (B - R) * 1.0f / (max - min) + 120;
}
else if (max == B)
{
H = H = 60 * (R - G) * 1.0f / (max - min) + 240;
}
// S
if (max == 0)
{
S = 0;
}
else
{
S = (max - min) * 1.0f / max;
}
// V
V = max;
return(new ColorHSV((int)H, (int)(S * 255), (int)(V * 255)));
}