class Rainbow::Color::RGB

def self.to_ansi_domain(value)
  (6 * (value / 256.0)).to_i
end

def code_from_rgb
  16 + self.class.to_ansi_domain(r) * 36 +
       self.class.to_ansi_domain(g) * 6  +
       self.class.to_ansi_domain(b)
end

def codes
  super + [5, code_from_rgb]
end

def initialize(ground, *values)
  raise ArgumentError.new(
    "RGB value outside 0-255 range"
  ) if values.min < 0 or values.max > 255
  super(ground, 8)
  @r, @g, @b = values
end