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Contents
require 'geometry/arc'
require 'geometry/edge'
module Geometry
=begin
An object representing a set of connected elements, each of which could be an
{Edge} or an {Arc}. Unlike a {Polygon}, a {Path} is not guaranteed to be closed.
=end
class Path
attr_reader :elements
# Construct a new Path from {Point}s, {Edge}s, and {Arc}s
# Successive {Point}s will be converted to {Edge}s.
def initialize(*args)
args.map! {|a| (a.is_a?(Array) or a.is_a?(Vector)) ? Point[a] : a}
args.each {|a| raise ArgumentError, "Unknown argument type #{a.class}" unless a.is_a?(Point) or a.is_a?(Edge) or a.is_a?(Arc) }
@elements = []
first = args.shift
push first if first.is_a?(Edge) or first.is_a?(Arc)
args.reduce(first) do |previous, n|
case n
when Point
case previous
when Point then push Edge.new(previous, n)
when Arc, Edge then push Edge.new(previous.last, n) unless previous.last == n
end
last
when Edge
case previous
when Point then push Edge.new(previous, n.first)
when Arc, Edge then push Edge.new(previous.last, n.first) unless previous.last == n.first
end
push(n).last
when Arc
case previous
when Point
if previous == n.first
raise ArgumentError, "Duplicated point before an Arc"
else
push Edge.new(previous, n.first)
end
when Arc, Edge
push Edge.new(previous.last, n.first) unless previous.last == n.first
end
push(n).last
else
raise ArgumentError, "Unsupported argument type: #{n}"
end
end
end
# @return [Geometry] The last element in the {Path}
def last
@elements.last
end
# Append a new geometry element to the {Path}
# @return [Path]
def push(arg)
@elements.push arg
self
end
end
end
Version data entries
15 entries across 15 versions & 3 rubygems