Class: Geometry::SizeZero

Inherits:
Object
  • Object
show all
Defined in:
lib/geometry/size_zero.rb

Overview

An object repesenting a zero Size in N-dimensional space

A SizeZero object is a Size that will always compare equal to zero and unequal to everything else, regardless of dimensionality. You can think of it as an application of the Null Object Pattern.

Unary operators collapse

Instance Method Summary collapse

Instance Method Details

#*(other) ⇒ Object 



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# File 'lib/geometry/size_zero.rb', line 57

def *(other)
    self
end

#+(other) ⇒ Object 



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# File 'lib/geometry/size_zero.rb', line 45

def +(other)
    other
end

#+@ ⇒ Object 



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# File 'lib/geometry/size_zero.rb', line 36

def +@
    self
end

#-(other) ⇒ Object 



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# File 'lib/geometry/size_zero.rb', line 49

def -(other)
    if other.respond_to? :-@
	-other
    elsif other.respond_to? :map
	other.map {|a| -a }
    end
end

#-@ ⇒ Object 



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# File 'lib/geometry/size_zero.rb', line 40

def -@
    self
end

#/(other) ⇒ Object

Raises:



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# File 'lib/geometry/size_zero.rb', line 61

def /(other)
    raise OperationNotDefined unless other.is_a? Numeric
    raise ZeroDivisionError if 0 == other
    self
end

#coerce(other) ⇒ Object 



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# File 'lib/geometry/size_zero.rb', line 21

def coerce(other)
    if other.is_a? Numeric
	[other, 0]
    elsif other.is_a? Array
	[other, Array.new(other.size,0)]
    elsif other.is_a? Vector
	[other, Vector[*Array.new(other.size,0)]]
    else
	[Size[other], Size[Array.new(other.size,0)]]
    end
end

#eql?(other) ⇒ Boolean Also known as: ==

Returns:

  • (Boolean) 


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# File 'lib/geometry/size_zero.rb', line 12

def eql?(other)
    if other.respond_to? :all?
	other.all? {|e| e.eql? 0}
    else
	other == 0
    end
end