module OoxmlParser::ColorHelper
Helper methods for color
Public Instance Methods
parse_hex_string(hex_string)
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Parse string in hex @param [String] hex_string with or without alpha-channel
# File lib/ooxml_parser/common_parser/common_data/color/color_helper.rb, line 8 def parse_hex_string(hex_string) return self if %w[auto null].include?(hex_string) char_array = hex_string.chars case char_array.length when 3 @red = char_array[0].hex @green = char_array[1].hex @blue = char_array[2].hex when 6 @red = (char_array[0] + char_array[1]).hex @green = (char_array[2] + char_array[3]).hex @blue = (char_array[4] + char_array[5]).hex when 8 @alpha_channel = (char_array[0] + char_array[1]).hex @red = (char_array[2] + char_array[3]).hex @green = (char_array[4] + char_array[5]).hex @blue = (char_array[6] + char_array[7]).hex end self end
to_hsl()
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Convert color to HSLColor
@return [HSLColor]
# File lib/ooxml_parser/common_parser/common_data/color/color_helper.rb, line 32 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