// Used when generating barrier XML using System; namespace JSIL.Internal { public static class HTMLColor { public const UInt16 HueUnit = 600; public const UInt16 HueMin = 0, HueMax = (HueUnit * 6) - 1; public const UInt16 SaturationMin = 0, SaturationMax = 2550; public const UInt16 ValueMin = 0, ValueMax = 2550; static byte ClampByte (int value) { if (value < 0) return 0; else if (value > 255) return 255; else return (byte)value; } public static string FromRGB (int r, int g, int b) { return String.Format( "#{0:x2}{1:x2}{2:x2}", r, g, b ); } public static string FromHSV (UInt16 hue, UInt16 saturation, UInt16 value) { if (value <= ValueMin) return FromRGB(0, 0, 0); if ((value >= ValueMax) && (saturation <= SaturationMin)) return FromRGB(255, 255, 255); if (value > ValueMax) value = ValueMax; if (saturation > SaturationMax) saturation = SaturationMax; int range = value * 255 / ValueMax; if (saturation <= SaturationMin) return FromRGB(range, range, range); int segment = hue / HueUnit; int remainder = hue - (segment * HueUnit); int colorRange = (saturation) * range / SaturationMax; int c = (SaturationMax - saturation) * range / SaturationMax; int b = (remainder * colorRange) / HueUnit + c; int rb = colorRange - b + (c * 2); int a = colorRange + c; switch (segment) { case 0: return FromRGB(ClampByte(a), ClampByte(b), ClampByte(c)); case 1: return FromRGB(ClampByte(rb), ClampByte(a), ClampByte(c)); case 2: return FromRGB(ClampByte(c), ClampByte(a), ClampByte(b)); case 3: return FromRGB(ClampByte(c), ClampByte(rb), ClampByte(a)); case 4: return FromRGB(ClampByte(b), ClampByte(c), ClampByte(a)); case 5: return FromRGB(ClampByte(a), ClampByte(c), ClampByte(rb)); default: throw new ArgumentException("Invalid color"); } } } }