forked from MapComplete/MapComplete
70 lines
2.4 KiB
Svelte
70 lines
2.4 KiB
Svelte
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<script lang="ts">
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/**
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* The overlay map is a bit a weird map:
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* it is a HTML-component which is intended to be placed _over_ another map.
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* It will align itself in order to seamlessly show the same location; but possibly in a different style
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*/
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import MaplibreMap from "./MaplibreMap.svelte";
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import {Store, UIEventSource} from "../../Logic/UIEventSource";
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import {Map as MlMap} from "maplibre-gl";
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import {MapLibreAdaptor} from "./MapLibreAdaptor";
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import type {MapProperties} from "../../Models/MapProperties";
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import {onDestroy} from "svelte";
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import type {RasterLayerPolygon} from "../../Models/RasterLayers";
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export let placedOverMapProperties: MapProperties
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export let placedOverMap: UIEventSource<MlMap>
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export let rasterLayer: UIEventSource<RasterLayerPolygon>
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export let visible: Store<boolean> = undefined
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let altmap: UIEventSource<MlMap> = new UIEventSource(undefined)
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let altproperties = new MapLibreAdaptor(altmap, {
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rasterLayer,
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zoom: UIEventSource.feedFrom(placedOverMapProperties.zoom)
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})
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altproperties.allowMoving.setData(false)
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altproperties.allowZooming.setData(false)
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function pixelCenterOf(map: UIEventSource<MlMap>): [number, number] {
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const rect = map?.data?.getCanvas()?.getBoundingClientRect()
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if (!rect) {
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return undefined
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}
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const x = (rect.left + rect.right) / 2
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const y = (rect.top + rect.bottom) / 2
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return [x, y]
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}
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function updateLocation() {
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if (!placedOverMap.data || !altmap.data) {
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return
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}
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altmap.data.resize()
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const {lon, lat} = placedOverMapProperties.location.data
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const altMapCenter = pixelCenterOf(altmap)
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const c = placedOverMap.data.unproject(altMapCenter)
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altproperties.location.setData({lon: c.lng, lat: c.lat})
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}
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onDestroy(placedOverMapProperties.location.addCallbackAndRunD(updateLocation))
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updateLocation()
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window.setTimeout(updateLocation, 150)
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window.setTimeout(updateLocation, 500)
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if (visible) {
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onDestroy(visible?.addCallbackAndRunD(v => {
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if (!v) {
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return
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}
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updateLocation()
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window.setTimeout(updateLocation, 150)
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window.setTimeout(updateLocation, 500)
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}))
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}
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</script>
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<MaplibreMap map={altmap}/>
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