Sha256: 37763750e3bd85d9e1d42f468ebd52a13e5bbba3415f5daf5b595a33c2d282ba
Contents?: true
Size: 1.21 KB
Versions: 11
Compression:
Stored size: 1.21 KB
Contents
require_relative 'point'
module Geometry
=begin rdoc
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
{http://en.wikipedia.org/wiki/Null_Object_pattern Null Object Pattern}.
=end
class SizeZero
def eql?(other)
if other.respond_to? :all?
other.all? {|e| e.eql? 0}
else
other == 0
end
end
alias == eql?
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
# @group Arithmetic
# @group Unary operators
def +@
self
end
def -@
self
end
# @endgroup
def +(other)
other
end
def -(other)
if other.respond_to? :-@
-other
elsif other.respond_to? :map
other.map {|a| -a }
end
end
def *(other)
self
end
def /(other)
raise OperationNotDefined unless other.is_a? Numeric
raise ZeroDivisionError if 0 == other
self
end
# @endgroup
end
end
Version data entries
11 entries across 11 versions & 3 rubygems