Class: ColorConversion::ColorConverter

Inherits:
Object
  • Object
show all
Defined in:
lib/color_conversion/color_converter.rb

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(color) ⇒ ColorConverter

Returns a new instance of ColorConverter.



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# File 'lib/color_conversion/color_converter.rb', line 23

def initialize(color)
  @rgba = to_rgba(color)
end

Class Attribute Details

.converters ⇒ Object (readonly)

Returns the value of attribute converters.



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# File 'lib/color_conversion/color_converter.rb', line 7

def converters
  @converters
end

Instance Attribute Details

#rgba ⇒ Object (readonly)

Returns the value of attribute rgba.



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# File 'lib/color_conversion/color_converter.rb', line 3

def rgba
  @rgba
end

Class Method Details

.factory(color) ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 16

def self.factory(color)
  converter = ColorConverter.converters.find do |klass| 
    klass.matches?(color)
  end
  converter.new(color) if converter
end

.inherited(subclass) ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 12

def self.inherited(subclass)
  ColorConverter.converters << subclass
end

Instance Method Details

#alpha ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 119

def alpha
  @rgba[:a]
end

#cmyk ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 103

def cmyk
  r = @rgba[:r] / 255.0
  g = @rgba[:g] / 255.0
  b = @rgba[:b] / 255.0

  k = [1.0 - r, 1.0 - g, 1.0 - b].min
  c = (1.0 - r - k) / (1.0 - k)
  m = (1.0 - g - k) / (1.0 - k)
  y = (1.0 - b - k) / (1.0 - k)

  {c: (c * 100).round, 
   m: (m * 100).round, 
   y: (y * 100).round, 
   k: (k * 100).round}
end

#hex ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 31

def hex      
  "#" + ("%02x" % @rgba[:r] + "%02x" % @rgba[:g] + "%02x" % @rgba[:b])
end

#hsb ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 97

def hsb
  hsb = hsv
  hsb[:b] = hsb.delete(:v)
  hsb
end

#hsl ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 35

def hsl
  r = @rgba[:r] / 255.0
  g = @rgba[:g] / 255.0
  b = @rgba[:b] / 255.0
  min = [r, g, b].min
  max = [r, g, b].max
  delta = max - min

  h = if max == min
    0
  elsif r == max
    (g - b) / delta 
  elsif g == max
    2 + (b - r) / delta 
  elsif b == max
    4 + (r - g) / delta
  end
  
  h = [h * 60, 360].min
  h += 360 if h < 0
  l = (min + max) / 2.0

  s = if (max == min)
    0
  elsif (l <= 0.5)
    delta / (max + min)
  else
    delta / (2.0 - max - min)
  end

  {h: h.round, s: (s * 100).round, l: (l * 100).round}
end

#hsv ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 68

def hsv
  r = @rgba[:r].to_f
  g = @rgba[:g].to_f
  b = @rgba[:b].to_f
  min = [r, g, b].min
  
  max = [r, g, b].max
  delta = (max - min).to_f
  
  s = max == 0 ? 0 : (delta / max * 1000) / 10.0
  
  h = if max == min
    0
  elsif r == max
    (g - b) / delta
  elsif g == max
    2 + (b - r) / delta 
  elsif b == max
    4 + (r - g) / delta
  end
  
  h = [h * 60, 360].min      
  h += 360 if h < 0

  v = ((max / 255.0) * 1000) / 10.0

  {h: h.round, s: s.round, v: v.round}
end

#rgb ⇒ Object 



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# File 'lib/color_conversion/color_converter.rb', line 27

def rgb
  {r: @rgba[:r], g: @rgba[:g], b: @rgba[:b]}
end