53 lines
1.8 KiB
TypeScript
53 lines
1.8 KiB
TypeScript
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import FeatureSource from "../FeatureSource"
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import { Store } from "../../UIEventSource"
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import { Feature, Point } from "geojson"
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import { GeoOperations } from "../../GeoOperations"
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export interface SnappingOptions {
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/**
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* If the distance is bigger then this amount, don't snap.
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* In meter
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*/
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maxDistance?: number
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}
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export default class SnappingFeatureSource implements FeatureSource {
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public readonly features: Store<Feature<Point>[]>
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constructor(
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snapTo: FeatureSource,
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location: Store<{ lon: number; lat: number }>,
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options?: SnappingOptions
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) {
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const simplifiedFeatures = snapTo.features.mapD((features) =>
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features
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.filter((feature) => feature.geometry.type !== "Point")
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.map((f) => GeoOperations.forceLineString(<any>f))
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)
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location.mapD(
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({ lon, lat }) => {
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const features = snapTo.features.data
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const loc: [number, number] = [lon, lat]
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const maxDistance = (options?.maxDistance ?? 1000) * 1000
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let bestSnap: Feature<Point, { "snapped-to": string; dist: number }> = undefined
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for (const feature of features) {
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const snapped = GeoOperations.nearestPoint(<any>feature, loc)
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if (snapped.properties.dist > maxDistance) {
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continue
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}
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if (
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bestSnap === undefined ||
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bestSnap.properties.dist > snapped.properties.dist
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) {
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snapped.properties["snapped-to"] = feature.properties.id
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bestSnap = <any>snapped
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}
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}
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return bestSnap
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},
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[snapTo.features]
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)
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}
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}
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