import {Or, TagsFilter} from "./TagsFilter"; import {UIEventSource} from "../UI/UIEventSource"; import {FilteredLayer} from "./FilteredLayer"; import {Bounds} from "./Bounds"; import {Overpass} from "./Osm/Overpass"; import {Basemap} from "./Leaflet/Basemap"; 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: Bounds; 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(); }); self.update(); } private handleData(geojson: any) { const self = this; function renderLayers(layers: FilteredLayer[]) { if (layers.length === 0) { self.runningQuery.setData(false); if (geojson.features.length > 0) { console.log("Got some leftovers: ", geojson) } return; } window.setTimeout(() => { const layer = layers[0]; const rest = layers.slice(1, layers.length); geojson = layer.SetApplicableData(geojson); renderLayers(rest); }, 50) } renderLayers(this._layers); } private _failCount = 0; private handleFail(reason: any) { console.log("QUERY FAILED (retrying in 5 sec)", reason); this.previousBounds = undefined; const self = this; this._failCount++; window?.setTimeout( function(){self.update()}, this._failCount * 5000 ) } private update(): void { if (this.IsInBounds()) { return; } console.log("Zoom level: ",this._map.map.getZoom(), "Least needed zoom:", this._minzoom) if (this._map.map.getZoom() < this._minzoom || this._map.Location.data.zoom < this._minzoom) { return; } if (this.runningQuery.data) { console.log("Still running a query, skip"); } const bounds = this._map.map.getBounds(); const diff =0.07; const n = bounds.getNorth() + diff; const e = bounds.getEast() + diff; const s = bounds.getSouth() - diff; const w = bounds.getWest() - diff; this.previousBounds = {north: n, east: e, south: s, west: w}; this.runningQuery.setData(true); const self = this; this._overpass.queryGeoJson(this.previousBounds, function (data) { self.handleData(data) }, function (reason) { self.handleFail(reason) } ); } 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; } }