forked from MapComplete/MapComplete
85 lines
3 KiB
TypeScript
85 lines
3 KiB
TypeScript
import DynamicTileSource from "./DynamicTileSource"
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import { Store, UIEventSource } from "../../UIEventSource"
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import { BBox } from "../../BBox"
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import StaticFeatureSource from "../Sources/StaticFeatureSource"
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import { Feature, Point } from "geojson"
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import { Utils } from "../../../Utils"
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import { Tiles } from "../../../Models/TileRange"
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/**
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* Provides features summarizing the total amount of features at a given location
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*/
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export class SummaryTileSource extends DynamicTileSource {
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private static readonly empty = []
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constructor(
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cacheserver: string,
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layers: string[],
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zoomRounded: Store<number>,
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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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const layersSummed = layers.join("+")
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super(
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zoomRounded,
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0, // minzoom
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(tileIndex) => {
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const [z, x, y] = Tiles.tile_from_index(tileIndex)
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const coordinates = Tiles.centerPointOf(z, x, y)
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const count = UIEventSource.FromPromiseWithErr(
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Utils.downloadJson(`${cacheserver}/${layersSummed}/${z}/${x}/${y}.json`)
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)
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const features: Store<Feature<Point>[]> = count.mapD((count) => {
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if (count["error"] !== undefined) {
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console.error(
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"Could not download count for tile",
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z,
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x,
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y,
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"due to",
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count["error"]
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)
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return SummaryTileSource.empty
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}
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const counts = count["success"]
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if (counts === undefined || counts["total"] === 0) {
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return SummaryTileSource.empty
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}
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return [
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{
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type: "Feature",
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properties: {
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id: "summary_" + tileIndex,
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summary: "yes",
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...counts,
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layers: layersSummed,
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},
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geometry: {
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type: "Point",
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coordinates,
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},
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},
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]
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})
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return new StaticFeatureSource(
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features.map(
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(f) => {
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if (z !== zoomRounded.data) {
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return SummaryTileSource.empty
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}
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return f
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},
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[zoomRounded]
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)
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)
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},
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mapProperties,
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options
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)
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}
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}
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