code: function(factor, animate, originLeft, originTop, callback) {
  
        let self = this
  
        self.zoomTo(self.__zoomLevel * factor, animate, originLeft, originTop, callback)
  
      }
docs: Zooms the content by the given factor.
  
  @param factor {Number} Zoom by given factor
  @param animate {Boolean ? false} Whether to use animation
  @param originLeft {Number ? 0} Zoom in at given left coordinate
  @param originTop {Number ? 0} Zoom in at given top coordinate
  @param callback {Function ? null} A callback that gets fired when the zoom is complete.