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Contents
# frozen_string_literal: true
module OoxmlParser
# Helper methods for color
module ColorHelper
# Parse string in hex
# @param [String] hex_string with or without alpha-channel
def parse_hex_string(hex_string)
return self if %w[auto null].include?(hex_string)
char_array = hex_string.split(//)
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
# 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
7 entries across 7 versions & 1 rubygems