code: function ScrollZoomControlMethod(element, opts) {
    this._opts = defaults(opts || {}, defaultOptions);
  
    this._dynamics = new Dynamics();
  
    this._eventList = [];
  
    var fn = this._opts.frictionTime ? this.withSmoothing : this.withoutSmoothing;
    this._wheelListener = new WheelListener(element, fn.bind(this));
  }
docs: @class ScrollZoomControlMethod
  @implements ControlMethod
  @classdesc
  
  Controls the fov/zoom through the mouse wheel.
  
  @param {Element} element Element to listen for events.
  @param {Object} opts
  @param {number} [opts.frictionTime=0.2]
  @param {number} [opts.zoomDelta=0.001]