public RgbaColor(double h, double s, double b, double a = 1)
{
RgbaColor rgba = Utility.HsbaToRgba(new HsbaColor(h, s, b, a));
R = rgba.R;
G = rgba.G;
B = rgba.B;
A = rgba.A;
}
/// <summary>
/// Rgba转Hsba
/// </summary>
/// <param name="rgba"></param>
/// <returns></returns>
internal static HsbaColor RgbaToHsba(RgbaColor rgba)
{
int[] rgb = new int[] { rgba.R, rgba.G, rgba.B };
Array.Sort(rgb);
int max = rgb[2];
int min = rgb[0];
double hsbB = max / 255.0;
double hsbS = max == 0 ? 0 : (max - min) / (double)max;
double hsbH = 0;
if (rgba.R == rgba.G && rgba.R == rgba.B)
{
}
else
{
if (max == rgba.R && rgba.G >= rgba.B)
{
hsbH = (rgba.G - rgba.B) * 60.0 / (max - min) + 0.0;
}
else if (max == rgba.R && rgba.G < rgba.B)
{
hsbH = (rgba.G - rgba.B) * 60.0 / (max - min) + 360.0;
}
else if (max == rgba.G)
{
hsbH = (rgba.B - rgba.R) * 60.0 / (max - min) + 120.0;
}
else if (max == rgba.B)
{
hsbH = (rgba.R - rgba.G) * 60.0 / (max - min) + 240.0;
}
}
return(new HsbaColor(hsbH, hsbS, hsbB, rgba.A / 255.0));
}