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Contents
# Encoding: UTF-8
module Hue
module Colors
class ColorTemperature < Color
MEGA = 1e6
KELVIN_MIN = 2000
KELVIN_MAX = 6500
MIRED_MIN = 153
MIRED_MAX = 500
public
def initialize(temperature)
if scale = Hue.percent_to_unit_interval(temperature)
self.mired = unit_to_mired_interval(scale)
else
# Assume an integer value
temperature = temperature.to_i
if temperature >= KELVIN_MIN
self.kelvin = temperature
else
self.mired = temperature
end
end
end
def mired
@mired.floor
end
def mired=(t)
@mired = ranged(MIRED_MIN, t.to_f, MIRED_MAX)
end
def kelvin
ranged(KELVIN_MIN, MEGA / @mired, KELVIN_MAX).round
end
def kelvin=(t)
self.mired = (MEGA / ranged(KELVIN_MIN, t.to_f, KELVIN_MAX))
end
def to_hash
{ct: mired}
end
def to_s
"Temperature=#{self.kelvin.to_i}°K (#{self.mired} mired)"
end
def to_rgb
# using method described at
# http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/
temp = kelvin / 100
red = temp <= 66 ? 255 : 329.698727446 * ((temp - 60) ** -0.1332047592)
green = if temp <= 66
99.4708025861 * Math.log(temp) - 161.1195681661
else
288.1221695283 * ((temp - 60) ** -0.0755148492)
end
blue = if temp >= 66
255
elsif temp <= 19
0
else
138.5177312231 * Math.log(temp - 10) - 305.0447927307
end
RGB.new(red, green, blue)
end
private
def unit_to_mired_interval(unit_interval)
unit_interval * (MIRED_MAX - MIRED_MIN) + MIRED_MIN
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems