import {TagsFilter, TagUtils} from "./Tags"; import {UIEventSource} from "./UIEventSource"; import * as L from "leaflet" import {Layer} from "leaflet" import {GeoOperations} from "./GeoOperations"; import {UIElement} from "../UI/UIElement"; import State from "../State"; import LayerConfig from "../Customizations/JSON/LayerConfig"; import Hash from "./Web/Hash"; /*** * A filtered layer is a layer which offers a 'set-data' function * It is initialized with a tagfilter. * * When geojson-data is given to 'setData', all the geojson matching the filter, is rendered on this layer. * If it is not rendered, it is returned in a 'leftOver'-geojson; which can be consumed by the next layer. * * This also makes sure that no objects are rendered twice if they are applicable on two layers */ export class FilteredLayer { public readonly name: string | UIElement; public readonly filters: TagsFilter; public readonly isDisplayed: UIEventSource = new UIEventSource(true); private readonly combinedIsDisplayed: UIEventSource; public readonly layerDef: LayerConfig; private readonly _maxAllowedOverlap: number; /** The featurecollection from overpass */ private _dataFromOverpass: any[]; /** List of new elements, geojson features */ private _newElements = []; /** * The leaflet layer object which should be removed on rerendering */ private _geolayer; private _showOnPopup: (tags: UIEventSource, feature: any) => UIElement; constructor( layerDef: LayerConfig, showOnPopup: ((tags: UIEventSource, feature: any) => UIElement) ) { this.layerDef = layerDef; this._showOnPopup = showOnPopup; this.name = name; this.filters = layerDef.overpassTags; this._maxAllowedOverlap = layerDef.hideUnderlayingFeaturesMinPercentage; const self = this; this.combinedIsDisplayed = this.isDisplayed.map(isDisplayed => { return isDisplayed && State.state.locationControl.data.zoom >= self.layerDef.minzoom }, [State.state.locationControl] ); this.combinedIsDisplayed.addCallback(function (isDisplayed) { const map = State.state.bm.map; if (self._geolayer !== undefined && self._geolayer !== null) { if (isDisplayed) { self._geolayer.addTo(map); } else { map.removeLayer(self._geolayer); } } }) } /** * The main function to load data into this layer. * The data that is NOT used by this layer, is returned as a geojson object; the other data is rendered */ public SetApplicableData(geojson: any): any { const leftoverFeatures = []; const selfFeatures = []; for (let feature of geojson.features) { const tags = TagUtils.proprtiesToKV(feature.properties); const matches = this.filters.matches(tags); if (matches) { selfFeatures.push(feature); } if (!matches || this.layerDef.passAllFeatures) { leftoverFeatures.push(feature); } } this.RenderLayer(selfFeatures) const notShadowed = []; for (const feature of leftoverFeatures) { if (this._maxAllowedOverlap !== undefined && this._maxAllowedOverlap > 0) { if (GeoOperations.featureIsContainedInAny(feature, selfFeatures, this._maxAllowedOverlap)) { // This feature is filtered away continue; } } notShadowed.push(feature); } return { type: "FeatureCollection", features: notShadowed }; } public AddNewElement(element) { this._newElements.push(element); this.RenderLayer( this._dataFromOverpass); // Update the layer } private RenderLayer(features) { if (this._geolayer !== undefined && this._geolayer !== null) { // Remove the old geojson layer from the map - we'll reshow all the elements later on anyway State.state.bm.map.removeLayer(this._geolayer); } // We fetch all the data we have to show: let fusedFeatures = this.ApplyWayHandling(this.FuseData(features)); // And we copy some features as points - if needed const data = { type: "FeatureCollection", features: fusedFeatures } let self = this; this._geolayer = L.geoJSON(data, { style: feature => self.layerDef.GenerateLeafletStyle(feature.properties, self._showOnPopup !== undefined), pointToLayer: function (feature, latLng) { // Point to layer converts the 'point' to a layer object - as the geojson layer natively cannot handle points // Click handling is done in the next step const style = self.layerDef.GenerateLeafletStyle(feature.properties, self._showOnPopup !== undefined); let marker; if (style.icon === undefined) { marker = L.circle(latLng, { radius: 25, color: style.color }); } else if (style.icon.iconUrl.startsWith("$circle")) { marker = L.circle(latLng, { radius: 25, color: style.color }); } else { marker = L.marker(latLng, { icon: L.divIcon(style.icon) }); } return marker; }, onEachFeature: function (feature, layer: Layer) { if (self._showOnPopup === undefined) { // No popup contents defined -> don't do anything return; } const popup = L.popup({ autoPan: true, closeOnEscapeKey: true, }, layer); let uiElement: UIElement; const eventSource = State.state.allElements.addOrGetElement(feature); uiElement = self._showOnPopup(eventSource, feature); popup.setContent(uiElement.Render()); layer.bindPopup(popup); // We first render the UIelement (which'll still need an update later on...) // But at least it'll be visible already layer.on("click", (e) => { // We set the element as selected... State.state.selectedElement.setData(feature); uiElement.Update(); }); if (feature.properties.id.replace(/\//g, "_") === Hash.Get().data) { const center = GeoOperations.centerpoint(feature).geometry.coordinates; popup.setLatLng({lat: center[1], lng: center[0]}); popup.openOn(State.state.bm.map); State.state.selectedElement.setData(feature); uiElement.Update(); } } }); if (this.combinedIsDisplayed.data) { this._geolayer.addTo(State.state.bm.map); } } private ApplyWayHandling(fusedFeatures: any[]) { if (this.layerDef.wayHandling === LayerConfig.WAYHANDLING_DEFAULT) { // We don't have to do anything special return fusedFeatures; } // We have to convert all the ways into centerpoints const existingPoints = []; const newPoints = []; const existingWays = []; for (const feature of fusedFeatures) { if (feature.geometry.type === "Point") { existingPoints.push(feature); continue; } existingWays.push(feature); const centerPoint = GeoOperations.centerpoint(feature); newPoints.push(centerPoint); } fusedFeatures = existingPoints.concat(newPoints); if (this.layerDef.wayHandling === LayerConfig.WAYHANDLING_CENTER_AND_WAY) { fusedFeatures = fusedFeatures.concat(existingWays) } return fusedFeatures; } //*Fuses the old and the new datasets*/ private FuseData(data: any[]) { const oldData = this._dataFromOverpass ?? []; // We keep track of all the ids that are freshly loaded in order to avoid adding duplicates const idsFromOverpass: Set = new Set(); // A list of all the features to show const fusedFeatures = []; // First, we add all the fresh data: for (const feature of data) { idsFromOverpass.add(feature.properties.id); fusedFeatures.push(feature); } // Now we add all the stale data for (const feature of oldData) { if (idsFromOverpass.has(feature.properties.id)) { continue; // Feature already loaded and a fresher version is available } idsFromOverpass.add(feature.properties.id); fusedFeatures.push(feature); } this._dataFromOverpass = fusedFeatures; for (const feature of this._newElements) { if (!idsFromOverpass.has(feature.properties.id)) { // This element is not yet uploaded or not yet visible in overpass // We include it in the layer fusedFeatures.push(feature); } } return fusedFeatures; } }