Method getTiles

src/staticmaps.js:579–608

* Fetching tiles and limit concurrent connections

(baseLayers)

   *  Fetching tiles and limit concurrent connections
   */
  async getTiles(baseLayers) {
    const limit = this.tileRequestLimit;

    // Limit concurrent connections to tiles server
    // https://operations.osmfoundation.org/policies/tiles/#technical-usage-requirements
    if (Number(limit)) {
      const aQueue = [];
      const tiles = [];
      for (let i = 0, j = baseLayers.length; i < j; i += limit) {
        const chunks = baseLayers.slice(i, i + limit);
        const sQueue = [];
        aQueue.push(async () => {
          chunks.forEach((r) => {
            sQueue.push((async () => {
              const tile = await this.getTile(r);
              tiles.push(tile);
            })());
          });
          await Promise.all(sQueue);
        });
      }
      await asyncQueue(aQueue);
      return tiles;
    }

    // Do not limit concurrent connections at all
    const tilePromises = [];
    baseLayers.forEach((r) => { tilePromises.push(this.getTile(r)); });
    return Promise.all(tilePromises);
  }
}

export default StaticMaps;