code: function mxRhombus(bounds, fill, stroke, strokewidth)
  {
  	mxShape.call(this);
  	this.bounds = bounds;
  	this.fill = fill;
  	this.stroke = stroke;
  	this.strokewidth = (strokewidth != null) ? strokewidth : 1;
  }
docs: Copyright (c) 2006-2015, JGraph Ltd
  Copyright (c) 2006-2015, Gaudenz Alder
   
  Class: mxRhombus
  
  Extends <mxShape> to implement a rhombus (aka diamond) shape.
  This shape is registered under <mxConstants.SHAPE_RHOMBUS>
  in <mxCellRenderer>.
  
  Constructor: mxRhombus
  
  Constructs a new rhombus shape.
  
  Parameters:
  
  bounds - <mxRectangle> that defines the bounds. This is stored in
  <mxShape.bounds>.
  fill - String that defines the fill color. This is stored in <fill>.
  stroke - String that defines the stroke color. This is stored in <stroke>.
  strokewidth - Optional integer that defines the stroke width. Default is
  1. This is stored in <strokewidth>.