Visual Application Launcher

namespace VAL.ColorPicker
{
    using System;
    using System.Collections;
    using System.Drawing;

    /// <summary>
    ///   Abstract ColorComparer class used for sorting colors.
    /// </summary>
    internal abstract class ColorComparer : IComparer
    {
        public abstract int Compare(Color c1, Color c2);
        int IComparer.Compare(object obj1, object obj2)
        {
            return Compare((Color)obj1, (Color)obj2);
        }
    }

    /// <summary>
    ///   Class used to compare colors by hue, saturation & brightness.
    /// </summary>
    internal class HSBColorComparer : ColorComparer
    {
        public override int Compare(Color c1, Color c2)
        {
            int alphaDiff = c1.A - c2.A;
            float hueDiff = c1.GetHue() - c2.GetHue();
            float saturationDiff = c1.GetSaturation() - c2.GetSaturation();
            float brightnessDiff = c1.GetBrightness() - c2.GetBrightness();
            return (int)(((alphaDiff * 360 + hueDiff + saturationDiff) * 255 + brightnessDiff) * 255);
        }
    }

    /// <summary>
    ///   Class used to compare colors by name.
    /// </summary>
    internal class NameColorComparer : ColorComparer
    {
        public override int Compare(Color c1, Color c2)
        {
            return c1.Name.CompareTo(c2.Name);
        }
    }
}