code: function() {
  			var barEl = this.get(BAR_EL);
  
  			switch (this.get(DIRECTION)) {
  				case DIRECTION_LTR:
  				case DIRECTION_RTL:
  					this._barSpace = parseInt(this.get(WIDTH),10) - 
  						(parseInt(Dom.getStyle(barEl,'marginLeft'),10) || 0) -
  						(parseInt(Dom.getStyle(barEl,'marginRight'),10) || 0);
  					break;
  				case DIRECTION_TTB:
  				case DIRECTION_BTT:
  					this._barSpace = parseInt(this.get(HEIGHT),10) -
  						(parseInt(Dom.getStyle(barEl,'marginTop'),10) || 0)-
  						(parseInt(Dom.getStyle(barEl,'marginBottom'),10) || 0); 
  					break;
  			}
  			this._barFactor = this._barSpace / (this.get(MAX_VALUE) - (this.get(MIN_VALUE) || 0))  || 1;
  		}
docs: Calculates some auxiliary values to make the rendering faster
  @method _recalculateConstants
  @return  void
  @private