Method loadTiles

modules/services/VectorTileService.js:151–182

* loadTiles * Schedule any data requests needed to cover the current map view * @param {string} template - template to load tiles for

(template)

   * @param   {string}  template - template to load tiles for
   */
  loadTiles(template) {
    this._getSourceAsync(template)
      .then(source => {
        const header = source.header;
        if (header) {  // pmtiles - set up allowable zoom range
          this._tiler.zoomRange(header.minZoom, header.maxZoom);
          if (header.tileType !== 1) {
            throw new Error(`Unsupported tileType ${header.tileType}. Only Type 1 (MVT) is supported`);
          }
        }

        const viewport = this.context.viewport;
        if (source.lastv === viewport.v) return;  // exit early if the view is unchanged
        source.lastv = viewport.v;

        // Determine the tiles needed to cover the view..
        const tiles = this._tiler.getTiles(viewport).tiles;

        // Abort inflight requests that are no longer needed..
        for (const [tileID, controller] of source.inflight) {
          const needed = tiles.find(tile => tile.id === tileID);
          if (!needed) {
            controller.abort();
          }
        }

        // Issue new requests..
        const fetches = tiles.map(tile => this._loadTileAsync(source, tile));
        return Promise.all(fetches)
          .then(() => this._processMergeQueue(source));
      });
  }


  /**