Method extent

modules/core/MapSystem.js:859–865

* extent * Set/Get the map extent * @param extent? Extent Object to fit the map to * @return map extent -or- this

(extent)

   * @return map extent -or- this
   */
  extent(extent) {
    if (extent === undefined) {
      return this.context.viewport.visibleExtent();
    } else {
      return this.setMapParams(extent.center(), this.extentZoom(extent));
    }
  }


  /**