import {Basemap} from "./Basemap"; import {Overpass} from "./Overpass"; import {Or, TagsFilter} from "./TagsFilter"; import {UIEventSource} from "../UI/UIEventSource"; import {FilteredLayer} from "./FilteredLayer"; export class LayerUpdater { private _map: Basemap; private _layers: FilteredLayer[]; public readonly runningQuery: UIEventSource = new UIEventSource(false); /** * The previous bounds for which the query has been run */ private previousBounds: { north: number, east: number, south: number, west: number }; private _overpass: Overpass; private _minzoom: number; /** * The most important layer should go first, as that one gets first pick for the questions * @param map * @param minzoom * @param layers */ constructor(map: Basemap, minzoom: number, layers: FilteredLayer[]) { this._map = map; this._layers = layers; this._minzoom = minzoom; var filters: TagsFilter[] = []; for (const layer of layers) { filters.push(layer.filters); } this._overpass = new Overpass(new Or(filters)); const self = this; map.Location.addCallback(function () { self.update(); }); } private handleData(geojson: any) { this.runningQuery.setData(false); for (const layer of this._layers) { geojson = layer.SetApplicableData(geojson); } if (geojson.features.length > 0) { console.log("Got some leftovers: ", geojson) } } private handleFail(reason: any) { console.log("QUERY FAILED", reason); console.log("Retrying in 1s") this.previousBounds = undefined; const self = this; window.setTimeout( function(){self.update()}, 1000 ) } private update(): void { if (this.IsInBounds()) { return; } if (this._map.map.getZoom() < this._minzoom) { console.log("Not running query: zoom not sufficient"); return; } if (this.runningQuery.data) { console.log("Still running a query, skip"); } var bbox = this.buildBboxFor(); this.runningQuery.setData(true); const self = this; this._overpass.queryGeoJson(bbox, function (data) { self.handleData(data) }, function (reason) { self.handleFail(reason) } ); } private buildBboxFor(): string { const b = this._map.map.getBounds(); const diff =0.07; const n = b.getNorth() + diff; const e = b.getEast() + diff; const s = b.getSouth() - diff; const w = b.getWest() - diff; this.previousBounds = {north: n, east: e, south: s, west: w}; return "[bbox:" + s + "," + w + "," + n + "," + e + "]"; } private IsInBounds(): boolean { if (this.previousBounds === undefined) { return false; } const b = this._map.map.getBounds(); if (b.getSouth() < this.previousBounds.south) { return false; } if (b.getNorth() > this.previousBounds.north) { return false; } if (b.getEast() > this.previousBounds.east) { return false; } if (b.getWest() < this.previousBounds.west) { return false; } return true; } }