public class ColorArray
    {
        public Color[] Colors { get; set; }

        public int Width { get; set; }
        public int Height { get; set; }

        public ColorArray()
        {
        }

        public ColorArray(int width, int height)
        {
            Width = width;
            Height = height;
            Colors = new Color[width * height];
        }
        public Color this[int index]
        {
            get
            {
                return Colors[index];
            }
            set
            {
                Colors[index] = value;
            }
        }

        public Color this[int x, int y]
        {
            get
            {
                if (x < 0 || x >= Width || y < 0 || y >= Height)
                {
                    throw new IndexOutOfRangeException();
                }
                return Colors[x + y * Height];
            }
            set
            {
                if (x < 0 || x >= Width || y < 0 || y >= Height)
                {
                    throw new IndexOutOfRangeException();
                }
                Colors[x + y * Height] = value;
            }
        }
    }