Class: ZPNG::Color

Inherits:
Struct
  • Object
show all
Defined in:
lib/zpng/color.rb

Constant Summary collapse

BLACK = 
Color.new(0,0,0,0xff)
WHITE = 
Color.new(0xff,0xff,0xff,0xff)

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#a ⇒ Object Also known as: alpha

Returns the value of attribute a

Returns:

  • (Object) —

    the current value of a



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# File 'lib/zpng/color.rb', line 2

def a
  @a
end

#b ⇒ Object

Returns the value of attribute b

Returns:

  • (Object) —

    the current value of b



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# File 'lib/zpng/color.rb', line 2

def b
  @b
end

#g ⇒ Object

Returns the value of attribute g

Returns:

  • (Object) —

    the current value of g



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# File 'lib/zpng/color.rb', line 2

def g
  @g
end

#r ⇒ Object

Returns the value of attribute r

Returns:

  • (Object) —

    the current value of r



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# File 'lib/zpng/color.rb', line 2

def r
  @r
end

Instance Method Details

#black? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zpng/color.rb', line 13

def black?
  r == 0 && g == 0 && b == 0
end

#to_grayscale ⇒ Object 



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# File 'lib/zpng/color.rb', line 17

def to_grayscale
  (r+g+b)/3
end

#to_s ⇒ Object 



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# File 'lib/zpng/color.rb', line 21

def to_s
  "%02X%02X%02X" % [r,g,b]
end

#white? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zpng/color.rb', line 9

def white?
  r == 0xff && g == 0xff && b == 0xff
end