ColorPalette.cs

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namespace IDSImaging.Peak.ICV.Painting;
 
public class ColorPalette : Color
{
    private readonly Color[] _palette;
    private int _index;
 
    public ColorPalette(params Color[] colors)
        : base(0, 0, 0)
    {
        if (colors == null || colors.Length == 0)
        {
            throw new IcvNotPossibleException(
                "The given array is empty or null. Please provide an array with at least one element.");
        }
 
        ColorCode = colors[0].ColorCode;
        _palette = colors;
    }
 
    public ColorPalette(ColorPaletteConstant constant, byte numBitsPerPixel = 8)
        : base(0, 0, 0)
    {
        _palette = constant switch
        {
            ColorPaletteConstant.Colored3 => new Color[]
            {
                new(ColorConstant.Red, numBitsPerPixel),
                new(ColorConstant.Green, numBitsPerPixel),
                new(ColorConstant.Blue, numBitsPerPixel)
            },
            ColorPaletteConstant.Colored6 => new Color[]
            {
                new(ColorConstant.Red, numBitsPerPixel),
                new(ColorConstant.Green, numBitsPerPixel),
                new(ColorConstant.Blue, numBitsPerPixel),
                new(ColorConstant.Yellow, numBitsPerPixel),
                new(ColorConstant.Magenta, numBitsPerPixel),
                new(ColorConstant.Cyan, numBitsPerPixel)
            },
            _ => throw new IcvNotSupportedException("The given color palette constant is not supported.")
        };
 
        ColorCode = _palette[0].ColorCode;
    }
 
    public new (int r, int g, int b) RGB
    {
        get
        {
            (ushort r, ushort g, ushort b) rgb = base.RGB;
            NextColor();
            return (rgb.r, rgb.g, rgb.b);
        }
    }
 
    private void NextColor()
    {
        _index = (_index + 1) % _palette.Length;
        ColorCode = _palette[_index].ColorCode;
    }
}