Contents

# frozen_string_literal: true

module OoxmlParser
  # Helper methods for color
  module ColorHelper
    # @return [String] value for auto string
    AUTO_STRING_VALUE = 'auto'
    # @return [Regexp] regexp for hex string with 3 digits
    REGEXP_THREE_DIGITS = /(.)(.)(.)/.freeze
    # @return [Regexp] regexp for hex string with 6 digits
    REGEXP_SIX_DIGITS = /(..)(..)(..)/.freeze
    # @return [Regexp] regexp for hex string with 8 digits
    REGEXP_EIGHT_DIGITS = /(..)(..)(..)(..)/.freeze

    # Parse string in hex
    # @param [String] hex_string with or without alpha-channel
    def parse_hex_string(hex_string)
      return self if AUTO_STRING_VALUE == hex_string

      case hex_string.length
      when 3
        @red, @green, @blue = hex_string.match(REGEXP_THREE_DIGITS).captures.map(&:hex)
      when 6
        @red, @green, @blue = hex_string.match(REGEXP_SIX_DIGITS).captures.map(&:hex)
      when 8
        @alpha_channel, @red, @green, @blue = hex_string.match(REGEXP_EIGHT_DIGITS).captures.map(&:hex)
      end
      self
    end

    # Convert color to HSLColor
    # @return [HSLColor]
    def to_hsl
      hls_color = HSLColor.new

      min = [red, green, blue].min.to_f
      max = [red, green, blue].max.to_f

      delta = (max - min).to_f
      hls_color.l = (min + max) / 255.0 / 2.0
      hls_color.alpha_channel = alpha_channel.to_f / 255.0

      unless max == min
        hls_color.s = delta / (255.0 - (255.0 - max - min).abs)

        hls_color.h = if max == red && green >= blue
                        60.0 * (green - blue) / delta
                      elsif max == red && green < blue
                        (60.0 * (green - blue) / delta) + 360.0
                      elsif max == green
                        (60.0 * (blue - red) / delta) + 120.0
                      else
                        (60.0 * (red - green) / delta) + 240.0
                      end
      end

      hls_color
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
ooxml_parser-0.34.2	lib/ooxml_parser/common_parser/common_data/color/color_helper.rb
ooxml_parser-0.34.1	lib/ooxml_parser/common_parser/common_data/color/color_helper.rb
ooxml_parser-0.34.0	lib/ooxml_parser/common_parser/common_data/color/color_helper.rb