Class: ColorFun::HSL

Inherits:
Object
  • Object
show all
Defined in:
lib/color_fun/hsl.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(h, s, l) ⇒ HSL

Returns a new instance of HSL.



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# File 'lib/color_fun/hsl.rb', line 6

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

Instance Attribute Details

#hue ⇒ Object

Returns the value of attribute hue.



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# File 'lib/color_fun/hsl.rb', line 4

def hue
  @hue
end

#lightness ⇒ Object

Returns the value of attribute lightness.



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# File 'lib/color_fun/hsl.rb', line 4

def lightness
  @lightness
end

#saturation ⇒ Object

Returns the value of attribute saturation.



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# File 'lib/color_fun/hsl.rb', line 4

def saturation
  @saturation
end

Class Method Details

.from_rbg(r, g, b) ⇒ Object

Create a new HSL object based on the RGB values



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# File 'lib/color_fun/hsl.rb', line 40

def self.from_rbg(r,g,b)
  colors    = [r / 255.0, g / 255.0, b / 255.0]
  max       = colors.max
  min       = colors.min
  d         = max - min
  v         = max * 100

  s = max != 0.0 ? d / max *100 : 0.0

  if s == 0.0
    h = 0.0
  else
    case max
    when colors[0]
      h = (colors[1] - colors[2]) / d
    when colors[1]
      h = 2 + (colors[2] - colors[0]) / d
    when colors[2]
      h = 4 + (colors[0] - colors[1]) / d
    end
    h *= 60.0
    h += 360.0 if (h < 0)
  end
  self.new(h, s, v)
end

Instance Method Details

#name ⇒ Object

Return a name for this colour



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# File 'lib/color_fun/hsl.rb', line 11

def name
  Array.new.tap do |s|
    if @saturation == 0 && @lightness == 0
      s << "Black"
    elsif @saturation == 0 && @lightness == 100
      s << "White"
    elsif @saturation <= 15 && @saturation > 0
      s << "Light"
    elsif @lightness < 40 && @saturation > 0
      s << "Dark"
    end
    
    if @saturation > 0
      s << case @hue
      when 0..8, 347..360 then 'Red'
      when 9..42          then 'Orange'
      when 43..61         then 'Yellow'
      when 62..158        then 'Green'
      when 159..264       then 'Blue'
      when 265..285       then 'Purple'
      when 286..346       then 'Pink'
      end
    else
      s << "Grey"
    end
  end.join(' ')
end