module OoxmlParser::ColorHelper
Helper methods for color
Constants
- AUTO_STRING_VALUE
@return [String] value for auto string
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 11 def parse_hex_string(hex_string) return self if hex_string == AUTO_STRING_VALUE case hex_string.length when 3 @red, @green, @blue = hex_string.chars.map(&:hex) when 6 @red, @green, @blue = hex_string.unpack('A2A2A2').map(&:hex) when 8 @alpha_channel, @red, @green, @blue = hex_string.unpack('A2A2A2A2').map(&: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 27 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