Class: OoxmlParser::HSLColor

Inherits:
Object
  • Object
show all
Defined in:
lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hue = 0, saturation = 0, lightness = 0, a = nil) ⇒ HSLColor

Hue - The “attribute of a visual sensation according to which an area appears to be similar to one of the perceived colors: red, yellow, green, and blue, or to a combination of two of them”. Saturation - The “colorfulness of a stimulus relative to its own brightness”. Lightness - The “brightness relative to the brightness of a similarly illuminated white”.



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 11

def initialize(hue = 0, saturation = 0, lightness = 0, a = nil)
  @a = a
  @h = hue
  @s = saturation
  @l = lightness
end

Instance Attribute Details

#a ⇒ Object

Returns the value of attribute a.



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 5

def a
  @a
end

#h ⇒ Object

Returns the value of attribute h.



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 5

def h
  @h
end

#l ⇒ Object

Returns the value of attribute l.



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 5

def l
  @l
end

#s ⇒ Object

Returns the value of attribute s.



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 5

def s
  @s
end

Class Method Details

.rgb_to_hsl(rgb_color) ⇒ Object 



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 18

def self.rgb_to_hsl(rgb_color)
  hls_color = HSLColor.new
  red = rgb_color.red.to_f # / 255.0
  green = rgb_color.green.to_f # / 255.0
  blue = rgb_color.blue.to_f # / 255.0

  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.a = rgb_color.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

Instance Method Details

#calculate_lum_value(tint, lum) ⇒ Object 



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 72

def calculate_lum_value(tint, lum)
  if tint.nil?
    lum
  else
    tint < 0 ? lum * (1.0 + tint) : lum * (1.0 - tint) + (255 - 255 * (1.0 - tint))
  end
end

#calculate_rgb_with_tint(tint) ⇒ Object 



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 80

def calculate_rgb_with_tint(tint)
  self.l = calculate_lum_value(tint, @l * 255.0) / 255.0
  to_rgb
end

#to_rgb ⇒ Object

Chroma - The “colorfulness relative to the brightness of a similarly illuminated white”.



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# File 'lib/ooxml_parser/common_parser/common_data/colors/hsl_color.rb', line 49

def to_rgb
  chroma = (1 - (2 * @l - 1).abs) * @s
  x = chroma * (1 - ((@h / 60.0) % 2.0 - 1).abs)
  m = @l - chroma / 2.0

  rgb = if @h.zero?
          Color.new(0, 0, 0)
        elsif @h > 0 && @h < 60
          Color.new(chroma, x, 0)
        elsif @h > 60 && @h < 120
          Color.new(x, chroma, 0)
        elsif @h > 120 && @h < 180
          Color.new(0, chroma, x)
        elsif @h > 180 && @h < 240
          Color.new(0, x, chroma)
        elsif @h > 240 && @h < 300
          Color.new(x, 0, chroma)
        else
          Color.new(chroma, 0, x)
        end
  Color.new(((rgb.red + m) * 255.0).round, ((rgb.green + m) * 255.0).round, ((rgb.blue + m) * 255.0).round)
end