class Colors::Xterm256
Attributes
Public Class Methods
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
Source
# File lib/colors/xterm256.rb, line 14 def ==(other) case other when Xterm256 code == other.code else super end end
Calls superclass method
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
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