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Contents
# A colour object representing YIQ (NTSC) colour encoding.
class Color::YIQ
include Color
# 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, &block)
new(y, i, q, 1.0, &block)
end
# Creates a YIQ colour object from percentages 0 .. 100.
#
# Color::YIQ.new(10, 20, 30)
def initialize(y = 0, i = 0, q = 0, radix = 100.0, &block) # :yields self:
@y, @i, @q = [ y, i, q ].map { |v| Color.normalize(v / radix) }
block.call if block
end
def coerce(other)
other.to_yiq
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
def to_a
[ y, i, q ]
end
end
Version data entries
109 entries across 109 versions & 2 rubygems