mapcomplete/Logic/LayerUpdater.ts
2020-09-15 02:29:31 +02:00

186 lines
No EOL
6.3 KiB
TypeScript

import {Or, TagsFilter} from "./Tags";
import {UIEventSource} from "./UIEventSource";
import {FilteredLayer} from "./FilteredLayer";
import {Bounds} from "./Bounds";
import {Overpass} from "./Osm/Overpass";
import {State} from "../State";
import {LayerDefinition} from "../Customizations/LayerDefinition";
export class LayerUpdater {
public readonly sufficentlyZoomed: UIEventSource<boolean>;
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 at the given zoom level
*
* Note that some layers only activate on a certain zoom level.
* If the map location changes, we check for each layer if it is loaded:
* we start checking the bounds at the first zoom level the layer might operate. If in bounds - no reload needed, otherwise we continue walking down
*/
private readonly previousBounds: Map<number, Bounds[]> = new Map<number, Bounds[]>();
private readonly state: State;
/**
* The most important layer should go first, as that one gets first pick for the questions
*/
constructor(state: State) {
this.state = state;
const self = this;
this.sufficentlyZoomed = State.state.locationControl.map(location => {
let minzoom = Math.min(...state.layoutToUse.data.layers.map(layer => (layer as LayerDefinition).minzoom ?? 18));
return location.zoom >= minzoom;
}, [state.layoutToUse]
);
for (let i = 0; i < 25; i++) {
// This update removes all data on all layers -> erase the map on lower levels too
this.previousBounds.set(i, []);
}
state.locationControl.addCallback(() => {
self.update(state)
});
state.layoutToUse.addCallback(() => {
self.update(state)
});
self.update(state);
}
private GetFilter(state: State) {
const filters: TagsFilter[] = [];
state = state ?? State.state;
for (const layer of state.layoutToUse.data.layers) {
if(typeof(layer) === "string"){
continue;
}
if (state.locationControl.data.zoom < layer.minzoom) {
console.log("Not loading layer ", layer.id, " as it needs at least ", layer.minzoom, "zoom")
continue;
}
// Check if data for this layer has already been loaded
let previouslyLoaded = false;
for (let z = layer.minzoom; z < 25 && !previouslyLoaded; z++) {
const previousLoadedBounds = this.previousBounds.get(z);
if (previousLoadedBounds === undefined) {
continue;
}
for (const previousLoadedBound of previousLoadedBounds) {
previouslyLoaded = previouslyLoaded || this.IsInBounds(state, previousLoadedBound);
if(previouslyLoaded){
break;
}
}
}
if (previouslyLoaded) {
continue;
}
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.warn("Got some leftovers: ", geojson)
}
return;
}
// We use window.setTimeout to give JS some time to update everything and make the interface not too laggy
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 {
const filter = this.GetFilter(state);
if (filter === undefined) {
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 = Math.min(90, bounds.getNorth() + diff);
const e = Math.min(180, bounds.getEast() + diff);
const s = Math.max(-90, bounds.getSouth() - diff);
const w = Math.max(-180, bounds.getWest() - diff);
const queryBounds = {north: n, east: e, south: s, west: w};
const z = Math.floor(state.locationControl.data.zoom);
this.runningQuery.setData(true);
const self = this;
const overpass = new Overpass(filter);
overpass.queryGeoJson(queryBounds,
function (data) {
self.previousBounds.get(z).push(queryBounds);
self.handleData(data)
},
function (reason) {
self.handleFail(state, reason)
}
);
}
private IsInBounds(state: State, bounds: Bounds): boolean {
if (this.previousBounds === undefined) {
return false;
}
const b = state.bm.map.getBounds();
return b.getSouth() >= bounds.south &&
b.getNorth() <= bounds.north &&
b.getEast() <= bounds.east &&
b.getWest() >= bounds.west;
}
public ForceRefresh() {
for (let i = 0; i < 25; i++) {
this.previousBounds.set(i, []);
}
this.update(this.state);
}
}