forked from MapComplete/MapComplete
74 lines
2.6 KiB
TypeScript
74 lines
2.6 KiB
TypeScript
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import { FeatureSourceForTile } from "../FeatureSource"
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import { Store } from "../../UIEventSource"
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import { BBox } from "../../BBox"
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import { Utils } from "../../../Utils"
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import { Feature } from "geojson"
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import { GeoOperations } from "../../GeoOperations"
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import DynamicTileSource from "./DynamicTileSource"
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/**
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* The PolygonSourceMerger receives various small pieces of bigger polygons and stitches them together.
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* This is used to reconstruct polygons of vector tiles
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*/
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export class PolygonSourceMerger extends DynamicTileSource<FeatureSourceForTile> {
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constructor(
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zoomlevel: Store<number>,
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minzoom: number,
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constructSource: (tileIndex: number) => FeatureSourceForTile,
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mapProperties: {
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bounds: Store<BBox>
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zoom: Store<number>
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},
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options?: {
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isActive?: Store<boolean>
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},
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) {
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super(zoomlevel, minzoom, constructSource, mapProperties, options)
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}
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protected addDataFromSources(sources: FeatureSourceForTile[]) {
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sources = Utils.NoNull(sources)
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const all: Map<string, Feature> = new Map()
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const zooms: Map<string, number> = new Map()
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for (const source of sources) {
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let z = source.z
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for (const f of source.features.data) {
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const id = f.properties.id
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if (id.endsWith("146616907")) {
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console.log("Horeca totaal")
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}
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if (!all.has(id)) {
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// No other parts of this polygon have been seen before, simply add it
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all.set(id, f)
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zooms.set(id, z)
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continue
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}
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// A part of this object has been seen before, eventually from a different zoom level
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const oldV = all.get(id)
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const oldZ = zooms.get(id)
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if (oldZ > z) {
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// The store contains more detailed information, so we ignore this part which has a lower accuraccy
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continue
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}
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if (oldZ < z) {
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// The old value has worse accuracy then what we receive now, we throw it away
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all.set(id, f)
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zooms.set(id, z)
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continue
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}
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const merged = GeoOperations.union(f, oldV)
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merged.properties = oldV.properties
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all.set(id, merged)
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zooms.set(id, z)
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}
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}
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const newList = Array.from(all.values())
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this.features.setData(newList)
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this._featuresById.setData(all)
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}
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}
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