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Contents
#--
# Color
# Colour management with Ruby
# http://rubyforge.org/projects/color
# Version 1.4.0
#
# Licensed under a MIT-style licence. See Licence.txt in the main
# distribution for full licensing information.
#
# Copyright (c) 2005 - 2007 Austin Ziegler and Matt Lyon
#
# $Id: test_all.rb 55 2007-02-03 23:29:34Z austin $
#++
# A colour object representing YIQ (NTSC) colour encoding.
class Color::YIQ
# Creates a YIQ colour object from fractional values 0 .. 1.
#
# Color::YIQ.new(0.3, 0.2, 0.1)
def self.from_fraction(y = 0, i = 0, q = 0)
color = Color::YIQ.new
color.y = y
color.i = i
color.q = q
color
end
# Creates a YIQ colour object from percentages 0 .. 100.
#
# Color::YIQ.new(10, 20, 30)
def initialize(y = 0, i = 0, q = 0)
@y = y / 100.0
@i = i / 100.0
@q = q / 100.0
end
# Compares the other colour to this one. The other colour will be
# converted to YIQ before comparison, so the comparison between a YIQ
# colour and a non-YIQ colour will be approximate and based on the other
# colour's #to_yiq conversion. If there is no #to_yiq conversion, this
# will raise an exception. This will report that two YIQ values are
# equivalent if all component colours are within COLOR_TOLERANCE of each
# other.
def ==(other)
other = other.to_yiq
other.kind_of?(Color::YIQ) and
((@y - other.y).abs <= Color::COLOR_TOLERANCE) and
((@i - other.i).abs <= Color::COLOR_TOLERANCE) and
((@q - other.q).abs <= Color::COLOR_TOLERANCE)
end
def to_yiq
self
end
def brightness
@y
end
def to_grayscale
Color::GrayScale.new(@y)
end
alias to_greyscale to_grayscale
def y
@y
end
def y=(yy)
@y = Color.normalize(yy)
end
def i
@i
end
def i=(ii)
@i = Color.normalize(ii)
end
def q
@q
end
def q=(qq)
@q = Color.normalize(qq)
end
def inspect
"YIQ [%.2f%%, %.2f%%, %.2f%%]" % [ @y * 100, @i * 100, @q * 100 ]
end
end
Version data entries
5 entries across 5 versions & 3 rubygems