Method extentZoom

modules/core/MapSystem.js:902–920

* extentZoom * Returns the maximum zoom that will fit the given extent in the map viewport. * @param extent Extent Object to fit * @param dimensions? Array [width, height] to fit it in (defaults to viewport) * @return zoom

(extent, dimensions)

   * @return zoom
   */
  extentZoom(extent, dimensions) {
    const viewport = this.context.viewport;
    const [w, h] = dimensions || viewport.dimensions;

    const tl = viewport.project([extent.min[0], extent.max[1]]);
    const br = viewport.project([extent.max[0], extent.min[1]]);

    // Calculate maximum zoom that fits extent
    const hFactor = (br[0] - tl[0]) / w;
    const vFactor = (br[1] - tl[1]) / h;
    const hZoomDiff = Math.log(Math.abs(hFactor)) / Math.LN2;
    const vZoomDiff = Math.log(Math.abs(vFactor)) / Math.LN2;
    const zoomDiff = Math.max(hZoomDiff, vZoomDiff);

    const currZoom = viewport.transform.zoom;
    const defaultZoom = Math.max(currZoom, 19);

    return isFinite(zoomDiff) ? (currZoom - zoomDiff) : defaultZoom;
  }


  /**