mapcomplete/Logic/LayerUpdater.ts
2020-07-31 16:17:16 +02:00

171 lines
No EOL
4.5 KiB
TypeScript

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";
import {State} from "../State";
export class LayerUpdater {
public readonly sufficentlyZoomed: UIEventSource<boolean> = new UIEventSource<boolean>(false);
public readonly runningQuery: UIEventSource<boolean> = new UIEventSource<boolean>(false);
public readonly retries: UIEventSource<number> = new UIEventSource<number>(0);
/**
* The previous bounds for which the query has been run
*/
private previousBounds: Bounds;
/**
* The most important layer should go first, as that one gets first pick for the questions
* @param map
* @param minzoom
* @param layers
*/
constructor(state: State) {
const self = this;
state.locationControl.addCallback(() => {
self.update(state)
});
state.layoutToUse.addCallback(() => {
self.update(state)
});
self.update(state);
}
private GetFilter(state: State) {
var filters: TagsFilter[] = [];
state = state ?? State.state;
for (const layer of state.layoutToUse.data.layers) {
if (state.locationControl.data.zoom < layer.minzoom) {
return undefined;
}
filters.push(layer.overpassFilter);
}
if (filters.length === 0) {
return undefined;
}
return new Or(filters);
}
private handleData(geojson: any) {
const self = this;
self.retries.setData(0);
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(State.state.filteredLayers.data);
}
private handleFail(state: State, reason: any) {
this.retries.data++;
this.ForceRefresh();
console.log(`QUERY FAILED (retrying in ${5 * this.retries.data} sec)`, reason);
this.retries.ping();
const self = this;
window?.setTimeout(
function () {
self.update(state)
}, this.retries.data * 5000
)
}
private update(state: State): void {
if (this.IsInBounds(state)) {
return;
}
const filter = this.GetFilter(state);
this.sufficentlyZoomed.setData(filter !== undefined);
if (filter === undefined) {
console.log("Zoom insufficient to run query")
return;
}
if (this.runningQuery.data) {
console.log("Still running a query, skip");
return;
}
const bounds = state.bm.map.getBounds();
const diff = state.layoutToUse.data.widenFactor;
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;
const overpass = new Overpass(filter);
overpass.queryGeoJson(this.previousBounds,
function (data) {
self.handleData(data)
},
function (reason) {
self.handleFail(state, reason)
}
);
}
private IsInBounds(state: State): boolean {
if (this.previousBounds === undefined) {
return false;
}
const b = state.bm.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;
}
public ForceRefresh(){
this.previousBounds = undefined;
}
}