Class: Colorable::RGB

Inherits:
ColorSpace show all
Defined in:
lib/colorable/color_space.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from ColorSpace

#<=>, #coerce, #move_to_top, #to_s

Methods included from Converter

#hex2rgb, #hsb2rgb, #name2rgb, #rgb2hex, #rgb2hsb, #rgb2hsl, #rgb2name

Constructor Details

#initialize(r = 0, g = 0, b = 0) ⇒ RGB

Returns a new instance of RGB.



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# File 'lib/colorable/color_space.rb', line 45

def initialize(r=0,g=0,b=0)
  @r, @g, @b = @rgb = validate_rgb([r, g, b])
end

Instance Attribute Details

#b ⇒ Object Also known as: blue

Returns the value of attribute b.



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# File 'lib/colorable/color_space.rb', line 44

def b
  @b
end

#g ⇒ Object Also known as: green

Returns the value of attribute g.



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# File 'lib/colorable/color_space.rb', line 44

def g
  @g
end

#r ⇒ Object Also known as: red

Returns the value of attribute r.



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# File 'lib/colorable/color_space.rb', line 44

def r
  @r
end

#rgb ⇒ Object Also known as: to_a

Returns the value of attribute rgb.



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# File 'lib/colorable/color_space.rb', line 44

def rgb
  @rgb
end

Instance Method Details

#*(other) ⇒ Object

Color multiplication

other should be a Color object. It applies multiply compositing.

Raises:

  • (ArgumentError) 


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# File 'lib/colorable/color_space.rb', line 95

def *(other)
  raise ArgumentError, "Invalid argument given" unless other.is_a?(RGB)
  rgb = compound_by(other.rgb) { |a, b| [(a*b/255.0).round, 0].max }
  self.class.new *rgb
end

#+(other) ⇒ Object

Color addition

other can be:

RGB object: apply minimum compositing.
Array of RGB values: each values added to each of RGBs.
Fixnum: other number added to all of RGBs.



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# File 'lib/colorable/color_space.rb', line 59

def +(other)
  rgb =
    case other
    when RGB
      compound_by(other.rgb) { |a, b| [a+b, 255].min }
    when Array
      raise ArgumentError, "Invalid size of Array given" unless other.size==3
      compound_by(other) { |a, b| (a + b) % 256 }
    when Fixnum
      compound_by([other] * 3) { |a, b| (a + b) % 256 }
    else
      raise ArgumentError, "Invalid argument given"
    end
  self.class.new *rgb
end

#-(other) ⇒ Object

Color subtruction

other can be:

RGB object: apply maximum compositing.
Array of RGB values: each values added to each of RGBs.
Fixnum: other number added to all of RGBs.



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# File 'lib/colorable/color_space.rb', line 81

def -(other)
  case other
  when RGB
    rgb = compound_by(other.rgb) { |a, b| [a+b-255, 0].max }
    self.class.new *rgb
  else
    super
  end
end

#/(other) ⇒ Object

Color division

other should be a Color object. It applies screen compositing.

Raises:

  • (ArgumentError) 


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# File 'lib/colorable/color_space.rb', line 105

def /(other)
  raise ArgumentError, "Invalid argument given" unless other.is_a?(RGB)
  rgb = compound_by(other.rgb) { |a, b| [a+b-(a*b/255.0).round, 255].min }
  self.class.new *rgb
end

#to_hex ⇒ Object 



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# File 'lib/colorable/color_space.rb', line 119

def to_hex
  rgb2hex(self.to_a)
end

#to_hsb ⇒ Object 



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# File 'lib/colorable/color_space.rb', line 115

def to_hsb
  rgb2hsb(self.to_a)
end

#to_name ⇒ Object 



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# File 'lib/colorable/color_space.rb', line 111

def to_name
  rgb2name(self.to_a)
end