# -*- coding: utf-8 -*-


require 'rays/ext'


module Rays


  class Point

    include Comparable

    def move_to! (*args)
      case args.size
      when 1 then self.x = self.y = args[0]
      when 2 then self.x, self.y = args
      when 3 then self.x, self.y, self.z = args
      else raise ArgumentError
      end
      self
    end

    def move_to (*args)
      dup.move_to! *args
    end

    def move_by! (*args)
      case args.size
      when 1 then self.x += args[0]; self.y += args[0]
      when 2 then self.x += args[0]; self.y += args[1]
      when 3 then self.x += args[0]; self.y += args[1]; self.z += args[2]
      else raise ArgumentError
      end
      self
    end

    def move_by (*args)
      dup.move_by! *args
    end

    def to_a (dimension = 2)
      case dimension
      when 1 then [x]
      when 2 then [x, y]
      when 3 then [x, y, z]
      else raise ArgumentError
      end
    end

    def [] (index)
      case index
      when 0 then x
      when 1 then y
      when 2 then z
      else raise IndexError
      end
    end

    def []= (index, val)
      case index
      when 0 then self.x = val
      when 1 then self.y = val
      when 2 then self.z = val
      else raise IndexError
      end
    end

    def <=> (o)
      ret = x <=> o.x; return ret if ret != 0
      ret = y <=> o.y; return ret if ret != 0
            z <=> o.z
    end

    def inspect ()
      "#<Rays::Point x=#{self.x}, y=#{self.y}, z=#{self.z}>"
    end

  end# Point


end# Rays