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