Class: Geometry::SizeOne

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

Overview

An object repesenting a Size of 1, in N-dimensional space

A SizeOne object is a Size that will always compare equal to one and unequal to everything else, regardless of dimensionality. It’s similar to the Null Object Pattern, but for ones.

Unary operators collapse

Enumerable collapse

Instance Method Summary collapse

Instance Method Details

#*(other) ⇒ Object

Raises:



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# File 'lib/geometry/size_one.rb', line 63

def *(other)
    raise OperationNotDefined unless other.is_a? Numeric
    other
end

#+(other) ⇒ Object 



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

def +(other)
    if other.respond_to?(:map)
	other.map {|a| a + 1 }
    else
	other + 1
    end
end

#+@ ⇒ Object 



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

def +@
    self
end

#-(other) ⇒ Object 



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# File 'lib/geometry/size_one.rb', line 53

def -(other)
    if other.is_a? Numeric
	1 - other
    elsif other.respond_to? :map
	other.map {|a| 1 - a }
    else
	1 - other
    end
end

#-@ ⇒ Object 



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

def -@
    -1
end

#/(other) ⇒ Object

Raises:



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# File 'lib/geometry/size_one.rb', line 68

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

#coerce(other) ⇒ Object 



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

def coerce(other)
    if other.is_a? Numeric
	[other, 1]
    elsif other.is_a? Array
	[other, Array.new(other.size,1)]
    elsif other.is_a? Vector
	[other, Vector[*Array.new(other.size,1)]]
    else
	[Size[other], Size[Array.new(other.size,1)]]
    end
end

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

Returns:

  • (Boolean) 


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

def eql?(other)
    if other.respond_to? :all?
	other.all? {|e| e.eql? 1}
    else
	other == 1
    end
end

#first(n = nil) ⇒ Object

Return the first, or first n, elements (always 0)

Parameters:

  • n (Number) (defaults to: nil) —

    the number of elements to return



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# File 'lib/geometry/size_one.rb', line 79

def first(n=nil)
    Array.new(n, 1) rescue 1
end