forked from MapComplete/MapComplete
84 lines
3.2 KiB
TypeScript
84 lines
3.2 KiB
TypeScript
/**
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* Applies geometry changes from 'Changes' onto every feature of a featureSource
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*/
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import { Changes } from "../../Osm/Changes"
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import { UIEventSource } from "../../UIEventSource"
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import { FeatureSource, IndexedFeatureSource } from "../FeatureSource"
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import { ChangeDescription, ChangeDescriptionTools } from "../../Osm/Actions/ChangeDescription"
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import { Feature } from "geojson"
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export default class ChangeGeometryApplicator implements FeatureSource {
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public readonly features: UIEventSource<Feature[]> = new UIEventSource<Feature[]>([])
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private readonly source: IndexedFeatureSource
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private readonly changes: Changes
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constructor(source: IndexedFeatureSource, changes: Changes) {
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this.source = source
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this.changes = changes
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this.features = new UIEventSource<Feature[]>(undefined)
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const self = this
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source.features.addCallbackAndRunD((_) => self.update())
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changes.allChanges.addCallbackAndRunD((_) => self.update())
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}
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private update() {
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const upstreamFeatures = this.source.features.data
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const upstreamIds = this.source.featuresById.data
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const changesToApply = this.changes.allChanges.data?.filter(
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(ch) =>
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// Does upstream have this element? If not, we skip
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upstreamIds.has(ch.type + "/" + ch.id) &&
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// Are any (geometry) changes defined?
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ch.changes !== undefined &&
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// Ignore new elements, they are handled by the NewGeometryFromChangesFeatureSource
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ch.id > 0
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)
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if (changesToApply === undefined || changesToApply.length === 0) {
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// No changes to apply!
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// Pass the original feature and lets continue our day
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this.features.setData(upstreamFeatures)
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return
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}
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const changesPerId = new Map<string, ChangeDescription[]>()
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for (const ch of changesToApply) {
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const key = ch.type + "/" + ch.id
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if (changesPerId.has(key)) {
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changesPerId.get(key).push(ch)
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} else {
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changesPerId.set(key, [ch])
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}
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}
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const newFeatures: Feature[] = []
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for (const feature of upstreamFeatures) {
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const changesForFeature = changesPerId.get(feature.properties.id)
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if (changesForFeature === undefined) {
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// No changes for this element - simply pass it along to downstream
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newFeatures.push(feature)
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continue
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}
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// Allright! We have a feature to rewrite!
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const copy = {
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...feature,
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}
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// We only apply the last change as that one'll have the latest geometry
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const change = changesForFeature[changesForFeature.length - 1]
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copy.geometry = ChangeDescriptionTools.getGeojsonGeometry(change)
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console.log(
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"Applying a geometry change onto:",
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feature,
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"The change is:",
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change,
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"which becomes:",
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copy
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)
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newFeatures.push(copy)
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}
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this.features.setData(newFeatures)
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}
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}
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