code: function updateBounds() {
           if (!this._bounds) {
             this._bounds = new me.Rect(0, 0, 0, 0);
           }
  
           this._bounds.setPoints(this.points);
  
           this._bounds.translateV(this.pos);
  
           return this._bounds;
         }
docs: update the bounding box for this shape.
  @name updateBounds
  @memberOf me.Polygon.prototype
  @function
  @return {me.Rect} this shape bounding box Rectangle object