class Colors::Xterm256

Attributes

code[R]

Public Class Methods

new(code) click to toggle source
# File lib/colors/xterm256.rb, line 5
def initialize(code)
  unless 16 <= code && code <= 255
    raise ArgumentError, "code should be in 16..255, but #{code} is given"
  end
  @code = code
end

Public Instance Methods

==(other) click to toggle source
Calls superclass method
# File lib/colors/xterm256.rb, line 14
def ==(other)
  case other
  when Xterm256
    code == other.code
  else
    super
  end
end
to_grey_level() click to toggle source
# File lib/colors/xterm256.rb, line 42
def to_grey_level
  if code < 232
    r, g, b = to_rgb_components
    y = Convert.rgb_to_greyscale(r, g, b)
    canonicalize_component_to_rational(y, :grey)
  else
    grey = 10*(code - 232) + 8
    canonicalize_component_from_integer(grey, :grey)
  end
end
to_rgb() click to toggle source
# File lib/colors/xterm256.rb, line 53
def to_rgb
  RGB.new(*to_rgb_components)
end
to_rgb_components() click to toggle source
# File lib/colors/xterm256.rb, line 23
def to_rgb_components
  if code < 232
    x = code - 16
    x, b = x.divmod(6)
    r, g = x.divmod(6)
    r = 40*r + 55 if r > 0
    g = 40*g + 55 if g > 0
    b = 40*b + 55 if b > 0
    [
      canonicalize_component_from_integer(r, :r),
      canonicalize_component_from_integer(g, :r),
      canonicalize_component_from_integer(b, :r)
    ]
  else
    grey = to_grey_level
    [grey, grey, grey]
  end
end