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r7kamura/WikiHubのコミュニティでヘッダの背景色が暗めか明るめか判断するやつ.rb

Created April 30, 2016 10:01
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WikiHubのコミュニティでヘッダの背景色が暗めか明るめか判断するやつ.rb
class Community < ActiveRecord::Base
# @note https://www.w3.org/TR/AERT#color-contrast
# @return [false, true]
def has_dark_header_background_color?
red, green, blue = header_background_color_hex.scan(/../).map { |hex| hex.to_i(16) }
(red * 299 + green * 587 + blue * 114) < 125_000
end
end
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