HSB.cs

public class HSB
    {
        public static Color getHSBColor(float hue, float saturation, float brightness)
        {
            int r = 0, g = 0, b = 0;
            if (saturation == 0)
            {
                r = g = b = (int)(brightness * 255.0f + 0.5f);
            }
            else
            {
                float h = (hue - (float)Math.Floor(hue)) * 6.0f;
                float f = h - (float)Math.Floor(h);
                float p = brightness * (1.0f - saturation);
                float q = brightness * (1.0f - saturation * f);
                float t = brightness * (1.0f - (saturation * (1.0f - f)));
                switch ((int)h)
                {
                    case 0:
                        r = (int)(brightness * 255.0f + 0.5f);
                        g = (int)(t * 255.0f + 0.5f);
                        b = (int)(p * 255.0f + 0.5f);
                        break;
                    case 1:
                        r = (int)(q * 255.0f + 0.5f);
                        g = (int)(brightness * 255.0f + 0.5f);
                        b = (int)(p * 255.0f + 0.5f);
                        break;
                    case 2:
                        r = (int)(p * 255.0f + 0.5f);
                        g = (int)(brightness * 255.0f + 0.5f);
                        b = (int)(t * 255.0f + 0.5f);
                        break;
                    case 3:
                        r = (int)(p * 255.0f + 0.5f);
                        g = (int)(q * 255.0f + 0.5f);
                        b = (int)(brightness * 255.0f + 0.5f);
                        break;
                    case 4:
                        r = (int)(t * 255.0f + 0.5f);
                        g = (int)(p * 255.0f + 0.5f);
                        b = (int)(brightness * 255.0f + 0.5f);
                        break;
                    case 5:
                        r = (int)(brightness * 255.0f + 0.5f);
                        g = (int)(p * 255.0f + 0.5f);
                        b = (int)(q * 255.0f + 0.5f);
                        break;
                }
            }

            return Color.FromArgb(255, r, g, b);
        }
    }