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Contents
module Sickill
module Rainbow
# Retrieve ANSI color code from RGB color.
class AnsiRgb
# +ground+ is one of :foreground, :background
# +rgb+ is an array of 3 values between 0 and 255.
def initialize(ground, rgb)
if RGB.outside_range?(rgb)
raise ArgumentError.new("RGB value outside 0-255 range")
end
@ground_code = { :foreground => 38, :background => 48 }[ground]
@red, @green, @blue = rgb[0], rgb[1], rgb[2]
end
# Get the ANSI color code for this RGB color.
def code
index = 16 +
RGB.to_ansi_domain(@red) * 36 +
RGB.to_ansi_domain(@green) * 6 +
RGB.to_ansi_domain(@blue)
"#{@ground_code};5;#{index}"
end
end
# Helper class for RGB color format.
class RGB
def self.outside_range?(rgb)
rgb.min < 0 or rgb.max > 255
end
# Change domain of color value from 0-255 to 0-5
def self.to_ansi_domain(value)
(6 * (value / 256.0)).to_i
end
end
end
end
Version data entries
15 entries across 15 versions & 4 rubygems