code: function mxPoint(x, y)
  {
  	this.x = (x != null) ? x : 0;
  	this.y = (y != null) ? y : 0;
  }
docs: Copyright (c) 2006-2015, JGraph Ltd
  Copyright (c) 2006-2015, Gaudenz Alder
   
  Class: mxPoint
  
  Implements a 2-dimensional vector with double precision coordinates.
  
  Constructor: mxPoint
  
  Constructs a new point for the optional x and y coordinates. If no
  coordinates are given, then the default values for <x> and <y> are used.