361 lines
12 KiB
TypeScript
361 lines
12 KiB
TypeScript
import {TagsFilter, TagUtils} from "./Tags";
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import {UIEventSource} from "./UIEventSource";
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import * as L from "leaflet"
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import {Layer} from "leaflet"
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import {GeoOperations} from "./GeoOperations";
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import {UIElement} from "../UI/UIElement";
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import State from "../State";
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import LayerConfig from "../Customizations/JSON/LayerConfig";
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/***
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* A filtered layer is a layer which offers a 'set-data' function
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* It is initialized with a tagfilter.
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*
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* When geojson-data is given to 'setData', all the geojson matching the filter, is rendered on this layer.
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* If it is not rendered, it is returned in a 'leftOver'-geojson; which can be consumed by the next layer.
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*
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* This also makes sure that no objects are rendered twice if they are applicable on two layers
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*/
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export class FilteredLayer {
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public readonly name: string | UIElement;
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public readonly filters: TagsFilter;
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public readonly isDisplayed: UIEventSource<boolean> = new UIEventSource(true);
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private readonly combinedIsDisplayed: UIEventSource<boolean>;
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public readonly layerDef: LayerConfig;
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private readonly _maxAllowedOverlap: number;
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private readonly _style: (properties) => { color: string, weight?: number, icon: { iconUrl: string, iconSize?: [number, number], popupAnchor?: [number, number], iconAnchor?: [number, number] } };
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/** The featurecollection from overpass
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*/
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private _dataFromOverpass: any[];
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private readonly _wayHandling: number;
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/** List of new elements, geojson features
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*/
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private _newElements = [];
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/**
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* The leaflet layer object which should be removed on rerendering
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*/
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private _geolayer;
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private _showOnPopup: (tags: UIEventSource<any>, feature: any) => UIElement;
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constructor(
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layerDef: LayerConfig,
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showOnPopup: ((tags: UIEventSource<any>, feature: any) => UIElement)
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) {
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this.layerDef = layerDef;
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this._wayHandling = layerDef.wayHandling;
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this._showOnPopup = showOnPopup;
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this._style = (tags) => {
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const iconUrl = layerDef.icon?.GetRenderValue(tags)?.txt;
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const iconSize = (layerDef.iconSize?.GetRenderValue(tags)?.txt ?? "40,40,center").split(",");
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const dashArray = layerDef.dashArray.GetRenderValue(tags)?.txt.split(" ").map(Number);
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function num(str, deflt = 40) {
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const n = Number(str);
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if (isNaN(n)) {
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return deflt;
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}
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return n;
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}
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const iconW = num(iconSize[0]);
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const iconH = num(iconSize[1]);
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const mode = iconSize[2] ?? "center"
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let anchorW = iconW / 2;
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let anchorH = iconH / 2;
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if (mode === "left") {
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anchorW = 0;
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}
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if (mode === "right") {
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anchorW = iconW;
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}
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if (mode === "top") {
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anchorH = 0;
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}
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if (mode === "bottom") {
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anchorH = iconH;
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}
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const color = layerDef.color?.GetRenderValue(tags)?.txt ?? "#00f";
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let weight = num(layerDef.width?.GetRenderValue(tags)?.txt, 5);
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return {
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icon:
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{
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iconUrl: iconUrl,
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iconSize: [iconW, iconH],
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iconAnchor: [anchorW, anchorH],
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popupAnchor: [0, 3 - anchorH]
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},
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color: color,
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weight: weight,
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dashArray: dashArray
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};
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};
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this.name = name;
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this.filters = layerDef.overpassTags;
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this._maxAllowedOverlap = layerDef.hideUnderlayingFeaturesMinPercentage;
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const self = this;
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this.combinedIsDisplayed = this.isDisplayed.map<boolean>(isDisplayed => {
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return isDisplayed && State.state.locationControl.data.zoom >= self.layerDef.minzoom
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},
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[State.state.locationControl]
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);
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this.combinedIsDisplayed.addCallback(function (isDisplayed) {
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const map = State.state.bm.map;
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if (self._geolayer !== undefined && self._geolayer !== null) {
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if (isDisplayed) {
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self._geolayer.addTo(map);
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} else {
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map.removeLayer(self._geolayer);
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}
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}
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})
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}
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static fromDefinition(
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definition,
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showOnPopup: (tags: UIEventSource<any>, feature: any) => UIElement):
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FilteredLayer {
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return new FilteredLayer(
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definition, showOnPopup);
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}
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/**
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* The main function to load data into this layer.
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* The data that is NOT used by this layer, is returned as a geojson object; the other data is rendered
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*/
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public SetApplicableData(geojson: any): any {
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const leftoverFeatures = [];
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const selfFeatures = [];
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for (let feature of geojson.features) {
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// feature.properties contains all the properties
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const tags = TagUtils.proprtiesToKV(feature.properties);
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if (!this.filters.matches(tags)) {
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leftoverFeatures.push(feature);
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continue;
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}
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if (feature.geometry.type !== "Point") {
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const centerPoint = GeoOperations.centerpoint(feature);
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if (this._wayHandling === LayerConfig.WAYHANDLING_CENTER_AND_WAY) {
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selfFeatures.push(centerPoint);
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} else if (this._wayHandling === LayerConfig.WAYHANDLING_CENTER_ONLY) {
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feature = centerPoint;
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}
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}
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selfFeatures.push(feature);
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}
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this.RenderLayer({
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type: "FeatureCollection",
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features: selfFeatures
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})
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const notShadowed = [];
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for (const feature of leftoverFeatures) {
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if (this._maxAllowedOverlap !== undefined && this._maxAllowedOverlap > 0) {
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if (GeoOperations.featureIsContainedInAny(feature, selfFeatures, this._maxAllowedOverlap)) {
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// This feature is filtered away
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continue;
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}
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}
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notShadowed.push(feature);
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}
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return {
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type: "FeatureCollection",
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features: notShadowed
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};
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}
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public AddNewElement(element) {
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this._newElements.push(element);
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this.RenderLayer({features: this._dataFromOverpass}, element); // Update the layer
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}
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private RenderLayer(data, openPopupOf = undefined) {
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let self = this;
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if (this._geolayer !== undefined && this._geolayer !== null) {
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// Remove the old geojson layer from the map - we'll reshow all the elements later on anyway
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State.state.bm.map.removeLayer(this._geolayer);
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}
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const oldData = this._dataFromOverpass ?? [];
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// We keep track of all the ids that are freshly loaded in order to avoid adding duplicates
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const idsFromOverpass: Set<number> = new Set<number>();
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// A list of all the features to show
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const fusedFeatures = [];
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// First, we add all the fresh data:
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for (const feature of data.features) {
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idsFromOverpass.add(feature.properties.id);
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fusedFeatures.push(feature);
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}
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// Now we add all the stale data
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for (const feature of oldData) {
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if (idsFromOverpass.has(feature.properties.id)) {
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continue; // Feature already loaded and a fresher version is available
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}
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idsFromOverpass.add(feature.properties.id);
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fusedFeatures.push(feature);
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}
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this._dataFromOverpass = fusedFeatures;
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for (const feature of this._newElements) {
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if (!idsFromOverpass.has(feature.properties.id)) {
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// This element is not yet uploaded or not yet visible in overpass
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// We include it in the layer
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fusedFeatures.push(feature);
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}
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}
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// We use a new, fused dataset
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data = {
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type: "FeatureCollection",
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features: fusedFeatures
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}
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// The data is split in two parts: the poinst and the rest
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// The points get a special treatment in order to render them properly
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// Note that some features might get a point representation as well
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const runWhenAdded: (() => void)[] = []
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this._geolayer = L.geoJSON(data, {
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style: function (feature) {
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return self._style(feature.properties);
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},
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pointToLayer: function (feature, latLng) {
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const style = self._style(feature.properties);
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let marker;
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if (style.icon === undefined) {
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marker = L.circle(latLng, {
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radius: 25,
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color: style.color
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});
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} else if (style.icon.iconUrl.startsWith("$circle")) {
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marker = L.circle(latLng, {
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radius: 25,
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color: style.color
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});
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} else {
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if (style.icon.iconSize === undefined) {
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style.icon.iconSize = [50, 50]
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}
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// @ts-ignore
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marker = L.marker(latLng, {
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icon: L.icon(style.icon),
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});
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}
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let eventSource = State.state.allElements.addOrGetElement(feature);
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const popup = L.popup({}, marker);
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let uiElement: UIElement;
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let content = undefined;
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let p = marker.bindPopup(popup)
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.on("popupopen", () => {
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if (content === undefined) {
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uiElement = self._showOnPopup(eventSource, feature);
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// Lazily create the content
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content = uiElement.Render();
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}
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popup.setContent(content);
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uiElement.Update();
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});
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if (feature === openPopupOf) {
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runWhenAdded.push(() => {
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p.openPopup();
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})
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}
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return marker;
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},
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onEachFeature: function (feature, layer:Layer) {
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// We monky-patch the feature element with an update-style
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function updateStyle () {
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// @ts-ignore
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if (layer.setIcon) {
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const style = self._style(feature.properties);
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const icon = style.icon;
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if (icon.iconUrl) {
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if (icon.iconUrl.startsWith("$circle")) {
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// pass
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} else {
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// @ts-ignore
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layer.setIcon(L.icon(icon))
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}
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}
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} else {
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self._geolayer.setStyle(function (featureX) {
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return self._style(featureX.properties);
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});
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}
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}
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let eventSource = State.state.allElements.addOrGetElement(feature);
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eventSource.addCallback(updateStyle);
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function openPopup(e) {
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State.state.selectedElement.setData({feature: feature});
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updateStyle()
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if (feature.geometry.type === "Point") {
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return; // Points bind there own popups
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}
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const uiElement = self._showOnPopup(eventSource, feature);
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L.popup({
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autoPan: true,
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}).setContent(uiElement.Render())
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.setLatLng(e.latlng)
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.openOn(State.state.bm.map);
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uiElement.Update();
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if (e) {
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L.DomEvent.stop(e); // Marks the event as consumed
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}
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}
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layer.on("click", openPopup);
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}
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});
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if (this.combinedIsDisplayed.data) {
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this._geolayer.addTo(State.state.bm.map);
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for (const f of runWhenAdded) {
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f();
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}
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}
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}
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} |