HSBからRGBへ変換する (コピペ用)

GetColorFromHSB_simple.cs

/// <summary>
/// Get System.Windows.Media.Color from Hue / Saturation / Brightness of double values without "if" statements
/// </summary>
/// <param name="Hue">Hue in 0 to 360</param>
/// <param name="Saturation">Saturation in 0 to 100</param>
/// <param name="Brightness">Brightness(Value) in 0 to 100</param>
/// <returns>Color</returns>
Color GetColorFromHSB_(double Hue, double Saturation, double Brightness)
{
	List<double> colors = new List<double> { 0, 0, 0 };
	int CC = colors.Count;

	#region << Hue(色相) >>
	double RelativeInDegrees = Hue / (360 / CC);
	int WholeNoPart = (int)Math.Truncate(RelativeInDegrees);
	double FractionalPart = RelativeInDegrees % 1.0;

	int StartIndex = WholeNoPart % CC;
	int SecondIndex = (WholeNoPart + 1) % CC;

	double val = FractionalPart * 2;
	double color1 = Math.Min(2 - val, 1);
	double color2 = Math.Min(val, 1);
	colors[StartIndex] = 255 * color1;
	colors[SecondIndex] = 255 * color2;
	#endregion

	#region << Saturation(彩度) >>
	double satAs0to1 = Saturation / 100.0;
	colors = colors.Select(item => item += (255 - item) * (1.0 - satAs0to1)).ToList();
	#endregion

	#region << Brightness / Value (輝度) >>
	double brightAs0to1 = Brightness / 100.0;
	colors = colors.Select(item => item *= brightAs0to1).ToList();
	#endregion

	var col = Color.FromArgb(255, (byte)colors[0], (byte)colors[1], (byte)colors[2]);
	return col;
}