forked from MapComplete/MapComplete
56 lines
1.8 KiB
TypeScript
56 lines
1.8 KiB
TypeScript
/// Given a feature source, calculates a list of OSM-contributors who mapped the latest versions
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import { Store, UIEventSource } from "./UIEventSource"
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import FeaturePipeline from "./FeatureSource/FeaturePipeline"
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import Loc from "../Models/Loc"
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import { BBox } from "./BBox"
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export default class ContributorCount {
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public readonly Contributors: UIEventSource<Map<string, number>> = new UIEventSource<
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Map<string, number>
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>(new Map<string, number>())
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private readonly state: {
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featurePipeline: FeaturePipeline
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currentBounds: Store<BBox>
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locationControl: Store<Loc>
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}
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private lastUpdate: Date = undefined
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constructor(state: {
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featurePipeline: FeaturePipeline
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currentBounds: Store<BBox>
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locationControl: Store<Loc>
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}) {
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this.state = state
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const self = this
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state.currentBounds.map((bbox) => {
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self.update(bbox)
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})
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state.featurePipeline.runningQuery.addCallbackAndRun((_) =>
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self.update(state.currentBounds.data)
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)
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}
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private update(bbox: BBox) {
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if (bbox === undefined) {
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return
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}
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const now = new Date()
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if (
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this.lastUpdate !== undefined &&
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now.getTime() - this.lastUpdate.getTime() < 1000 * 60
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) {
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return
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}
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this.lastUpdate = now
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const featuresList = this.state.featurePipeline.GetAllFeaturesWithin(bbox)
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const hist = new Map<string, number>()
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for (const list of featuresList) {
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for (const feature of list) {
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const contributor = feature.properties["_last_edit:contributor"]
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const count = hist.get(contributor) ?? 0
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hist.set(contributor, count + 1)
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}
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}
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this.Contributors.setData(hist)
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}
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}
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