MapComplete/UI/InputElement/Helpers/LocationInput.svelte

<script lang="ts">
    import {Store, UIEventSource} from "../../../Logic/UIEventSource";
    import type {MapProperties} from "../../../Models/MapProperties";
    import {Map as MlMap} from "maplibre-gl";
    import {MapLibreAdaptor} from "../../Map/MapLibreAdaptor";
    import MaplibreMap from "../../Map/MaplibreMap.svelte";
    import DragInvitation from "../../Base/DragInvitation.svelte";
    import {GeoOperations} from "../../../Logic/GeoOperations";
    import ShowDataLayer from "../../Map/ShowDataLayer";
    import * as boundsdisplay from "../../../assets/layers/range/range.json"
    import StaticFeatureSource from "../../../Logic/FeatureSource/Sources/StaticFeatureSource";
    import * as turf from "@turf/turf"
    import LayerConfig from "../../../Models/ThemeConfig/LayerConfig";
    import {onDestroy} from "svelte";

    /**
     * A visualisation to pick a location on a map background
     */
    export let value: UIEventSource<{ lon: number, lat: number }>;
    export let initialCoordinate : {lon: number, lat :number}
    initialCoordinate = initialCoordinate ?? value.data
    export let maxDistanceInMeters: number = undefined
    export let mapProperties: Partial<MapProperties> & {
        readonly location: UIEventSource<{ lon: number; lat: number }>
    } = undefined;
    /**
     * Called when setup is done, can be used to add more layers to the map
     */
    export let onCreated: (value: Store<{
        lon: number,
        lat: number
    }>, map: Store<MlMap>, mapProperties: MapProperties) => void = undefined

    export let map: UIEventSource<MlMap> = new UIEventSource<MlMap>(undefined);
    let mla = new MapLibreAdaptor(map, mapProperties);
    mapProperties.location.syncWith(value)
    if (onCreated) {
        onCreated(value, map, mla)
    }

    let rangeIsShown = false
    if (maxDistanceInMeters) {
        onDestroy(mla.location.addCallbackD(newLocation => {
            const l = [newLocation.lon, newLocation.lat]
            const c: [number, number] = [initialCoordinate.lon, initialCoordinate.lat]
            const d = GeoOperations.distanceBetween(l, c)
        console.log("distance is", d, l, c)
            if (d <= maxDistanceInMeters) {
                return
            }
            // This is too far away - let's move back
            const correctLocation = GeoOperations.along(c, l, maxDistanceInMeters - 10)
            window.setTimeout(() => {
                mla.location.setData({lon: correctLocation[0], lat: correctLocation[1]})
            }, 25)

            if (!rangeIsShown) {

                new ShowDataLayer(map, {
                    layer: new LayerConfig(boundsdisplay),
                    features: new StaticFeatureSource(
                        [turf.circle(c, maxDistanceInMeters, {units: "meters", properties: {"range":"yes", id: "0"}}, )]
                    )
                })
                rangeIsShown = true
            }
        }))
    }
</script>

<div class="relative h-full min-h-32 cursor-pointer overflow-hidden">
    <div class="w-full h-full absolute top-0 left-0 cursor-pointer">
        <MaplibreMap {map}/>
    </div>

    <div class="w-full h-full absolute top-0 left-0 p-8 pointer-events-none opacity-50 flex items-center">
        <img class="h-full max-h-24" src="./assets/svg/move-arrows.svg"/>
    </div>

    <DragInvitation hideSignal={mla.location.stabilized(3000)}></DragInvitation>

</div>