Method determineExtent

src/staticmaps.js:149–213

* calculate common extent of all current map features

(zoom)

    * calculate common extent of all current map features
    */
  determineExtent(zoom) {
    const extents = [];

    // Add bbox to extent
    if (this.center && this.center.length >= 4) extents.push(this.center);

    // add bounds to extent
    if (this.bounds.length) {
      this.bounds.forEach((bound) => extents.push(bound.extent()));
    }

    // Add polylines and polygons to extent
    if (this.lines.length) {
      this.lines.forEach((line) => {
        extents.push(line.extent());
      });
    }
    if (this.multipolygons.length) {
      this.multipolygons.forEach((multipolygon) => {
        extents.push(multipolygon.extent());
      });
    }

    // Add circles to extent
    if (this.circles.length) {
      this.circles.forEach((circle) => {
        extents.push(circle.extent());
      });
    }

    // Add marker to extent
    for (let i = 0; i < this.markers.length; i++) {
      const marker = this.markers[i];
      const e = [marker.coord[0], marker.coord[1]];

      if (!zoom) {
        extents.push([
          marker.coord[0],
          marker.coord[1],
          marker.coord[0],
          marker.coord[1],
        ]);
        continue;
      }

      // # consider dimension of marker
      const ePx = marker.extentPx();
      const x = geoutils.lonToX(e[0], zoom);
      const y = geoutils.latToY(e[1], zoom);

      extents.push([
        geoutils.xToLon(x - parseFloat(ePx[0]) / this.tileSize, zoom),
        geoutils.yToLat(y + parseFloat(ePx[1]) / this.tileSize, zoom),
        geoutils.xToLon(x + parseFloat(ePx[2]) / this.tileSize, zoom),
        geoutils.yToLat(y - parseFloat(ePx[3]) / this.tileSize, zoom),
      ]);
    }