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require_relative 'point'
module Geometry
=begin rdoc
An object repesenting a {Point} at the origin in N-dimensional space
A {PointZero} object is a {Point} that will always compare equal to zero and unequal to
everything else, regardless of size. You can think of it as an application of the
{http://en.wikipedia.org/wiki/Null_Object_pattern Null Object Pattern}.
=end
class PointZero
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
[Point[other], Point[Array.new(other.size,0)]]
end
end
# This is a hack to get Array#== to work properly. It works on ruby 2.0 and 1.9.3.
def to_ary
[]
end
# @group Accessors
# @param [Integer] i Index into the {Point}'s elements
# @return [Numeric] Element i (starting at 0)
def [](i)
0
end
# @attribute [r] x
# @return [Numeric] X-component
def x
0
end
# @attribute [r] y
# @return [Numeric] Y-component
def y
0
end
# @attribute [r] z
# @return [Numeric] Z-component
def z
0
end
# @endgroup
# @group Arithmetic
# @group Unary operators
def +@
self
end
def -@
self
end
# @endgroup
def +(other)
case other
when Array, Numeric then other
else
Point[other]
end
end
def -(other)
if other.is_a? Size
-Point[other]
elsif 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