133 lines
3.9 KiB
Ruby
133 lines
3.9 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module ColorMath
|
|
# Equivalent to dc-color-brightness() in variables.scss
|
|
def self.brightness(color)
|
|
rgb = Converters.hex_to_rgb(color)
|
|
(rgb[0].to_i * 299 + rgb[1].to_i * 587 + rgb[2].to_i * 114) / 1000.0
|
|
end
|
|
|
|
# Equivalent to dark-light-diff() in variables.scss
|
|
def self.dark_light_diff(adjusted_color, comparison_color, lightness, darkness)
|
|
if brightness(adjusted_color) < brightness(comparison_color)
|
|
scale_color_lightness(adjusted_color, lightness)
|
|
else
|
|
scale_color_lightness(adjusted_color, darkness)
|
|
end
|
|
end
|
|
|
|
# Equivalent to scale_color(color, lightness: ) in sass
|
|
def self.scale_color_lightness(color, adjustment)
|
|
rgb = Converters.hex_to_rgb(color)
|
|
h, s, l = Converters.rgb_to_hsl(*rgb)
|
|
|
|
l =
|
|
if adjustment > 0
|
|
l + (100 - l) * adjustment
|
|
else
|
|
l + l * adjustment
|
|
end
|
|
|
|
rgb = Converters.hsl_to_rgb(h, s, l)
|
|
Converters.rgb_to_hex(rgb)
|
|
end
|
|
|
|
module Converters
|
|
# Adapted from https://github.com/anilyanduri/color_math
|
|
#
|
|
# The MIT License (MIT)
|
|
#
|
|
# Copyright (c) 2016 Anil Yanduri
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in all
|
|
# copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
# SOFTWARE.
|
|
|
|
def self.hex_to_rgb(color)
|
|
color = color.gsub(/(.)/, '\1\1') if color.length == 3
|
|
raise new RuntimeError("Hex color must be 6 characters") if color.length != 6
|
|
color.scan(/../).map { |c| c.to_i(16) }
|
|
end
|
|
|
|
def self.rgb_to_hex(rgb)
|
|
rgb.map { |c| c.to_s(16).rjust(2, "0") }.join("")
|
|
end
|
|
|
|
def self.rgb_to_hsl(r, g, b)
|
|
r /= 255.0
|
|
g /= 255.0
|
|
b /= 255.0
|
|
max = [r, g, b].max
|
|
min = [r, g, b].min
|
|
h = (max + min) / 2.0
|
|
s = (max + min) / 2.0
|
|
l = (max + min) / 2.0
|
|
|
|
if (max == min)
|
|
h = 0
|
|
s = 0 # achromatic
|
|
else
|
|
d = max - min
|
|
s = l >= 0.5 ? d / (2.0 - max - min) : d / (max + min)
|
|
case max
|
|
when r
|
|
h = (g - b) / d + (g < b ? 6.0 : 0)
|
|
when g
|
|
h = (b - r) / d + 2.0
|
|
when b
|
|
h = (r - g) / d + 4.0
|
|
end
|
|
h /= 6.0
|
|
end
|
|
[(h * 360).round, (s * 100).round, (l * 100).round]
|
|
end
|
|
|
|
def self.hsl_to_rgb(h, s, l)
|
|
h = h / 360.0
|
|
s = s / 100.0
|
|
l = l / 100.0
|
|
|
|
r = 0.0
|
|
g = 0.0
|
|
b = 0.0
|
|
|
|
if (s == 0.0)
|
|
r = l.to_f
|
|
g = l.to_f
|
|
b = l.to_f #achromatic
|
|
else
|
|
q = l < 0.5 ? l * (1 + s) : l + s - l * s
|
|
p = 2 * l - q
|
|
r = hue_to_rgb(p, q, h + 1 / 3.0)
|
|
g = hue_to_rgb(p, q, h)
|
|
b = hue_to_rgb(p, q, h - 1 / 3.0)
|
|
end
|
|
|
|
[(r * 255).round, (g * 255).round, (b * 255).round]
|
|
end
|
|
|
|
def self.hue_to_rgb(p, q, t)
|
|
t += 1 if (t < 0)
|
|
t -= 1 if (t > 1)
|
|
return(p + (q - p) * 6 * t) if (t < 1 / 6.0)
|
|
return q if (t < 1 / 2.0)
|
|
return(p + (q - p) * (2 / 3.0 - t) * 6) if (t < 2 / 3.0)
|
|
p
|
|
end
|
|
end
|
|
end
|