forked from MapComplete/MapComplete
459 lines
16 KiB
TypeScript
459 lines
16 KiB
TypeScript
import { Store, UIEventSource } from "../../Logic/UIEventSource"
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import type { Map as MLMap } from "maplibre-gl"
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import { Map as MlMap, SourceSpecification } from "maplibre-gl"
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import { RasterLayerPolygon } from "../../Models/RasterLayers"
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import { Utils } from "../../Utils"
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import { BBox } from "../../Logic/BBox"
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import { ExportableMap, MapProperties } from "../../Models/MapProperties"
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import SvelteUIElement from "../Base/SvelteUIElement"
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import MaplibreMap from "./MaplibreMap.svelte"
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import html2canvas from "html2canvas"
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import { RasterLayerProperties } from "../../Models/RasterLayerProperties"
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/**
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* The 'MapLibreAdaptor' bridges 'MapLibre' with the various properties of the `MapProperties`
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*/
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export class MapLibreAdaptor implements MapProperties, ExportableMap {
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private static maplibre_control_handlers = [
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// "scrollZoom",
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// "boxZoom",
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// "doubleClickZoom",
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"dragRotate",
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"dragPan",
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"keyboard",
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"touchZoomRotate",
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]
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private static maplibre_zoom_handlers = [
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"scrollZoom",
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"boxZoom",
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"doubleClickZoom",
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"touchZoomRotate",
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]
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readonly location: UIEventSource<{ lon: number; lat: number }>
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readonly zoom: UIEventSource<number>
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readonly bounds: UIEventSource<BBox>
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readonly rasterLayer: UIEventSource<RasterLayerPolygon | undefined>
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readonly maxbounds: UIEventSource<BBox | undefined>
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readonly allowMoving: UIEventSource<true | boolean | undefined>
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readonly allowZooming: UIEventSource<true | boolean | undefined>
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readonly lastClickLocation: Store<undefined | { lon: number; lat: number }>
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readonly minzoom: UIEventSource<number>
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readonly maxzoom: UIEventSource<number>
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private readonly _maplibreMap: Store<MLMap>
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/**
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* Used for internal bookkeeping (to remove a rasterLayer when done loading)
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* @private
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*/
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private _currentRasterLayer: string
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constructor(maplibreMap: Store<MLMap>, state?: Partial<MapProperties>) {
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this._maplibreMap = maplibreMap
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this.location = state?.location ?? new UIEventSource({ lon: 0, lat: 0 })
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this.zoom = state?.zoom ?? new UIEventSource(1)
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this.minzoom = state?.minzoom ?? new UIEventSource(0)
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this.maxzoom = state?.maxzoom ?? new UIEventSource(24)
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this.zoom.addCallbackAndRunD((z) => {
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if (z < this.minzoom.data) {
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this.zoom.setData(this.minzoom.data)
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}
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const max = Math.min(24, this.maxzoom.data ?? 24)
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if (z > max) {
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this.zoom.setData(max)
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}
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})
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this.maxbounds = state?.maxbounds ?? new UIEventSource(undefined)
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this.allowMoving = state?.allowMoving ?? new UIEventSource(true)
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this.allowZooming = state?.allowZooming ?? new UIEventSource(true)
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this.bounds = state?.bounds ?? new UIEventSource(undefined)
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this.rasterLayer =
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state?.rasterLayer ?? new UIEventSource<RasterLayerPolygon | undefined>(undefined)
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const lastClickLocation = new UIEventSource<{ lon: number; lat: number }>(undefined)
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this.lastClickLocation = lastClickLocation
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const self = this
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function handleClick(e) {
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if (e.originalEvent["consumed"]) {
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// Workaround, 'ShowPointLayer' sets this flag
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return
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}
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console.log(e)
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const lon = e.lngLat.lng
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const lat = e.lngLat.lat
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lastClickLocation.setData({ lon, lat })
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}
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maplibreMap.addCallbackAndRunD((map) => {
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map.on("load", () => {
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this.updateStores()
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self.setBackground()
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self.MoveMapToCurrentLoc(self.location.data)
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self.SetZoom(self.zoom.data)
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self.setMaxBounds(self.maxbounds.data)
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self.setAllowMoving(self.allowMoving.data)
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self.setAllowZooming(self.allowZooming.data)
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self.setMinzoom(self.minzoom.data)
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self.setMaxzoom(self.maxzoom.data)
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self.setBounds(self.bounds.data)
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})
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self.MoveMapToCurrentLoc(self.location.data)
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self.SetZoom(self.zoom.data)
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self.setMaxBounds(self.maxbounds.data)
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self.setAllowMoving(self.allowMoving.data)
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self.setAllowZooming(self.allowZooming.data)
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self.setMinzoom(self.minzoom.data)
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self.setMaxzoom(self.maxzoom.data)
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self.setBounds(self.bounds.data)
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this.updateStores()
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map.on("moveend", () => this.updateStores())
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map.on("click", (e) => {
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handleClick(e)
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})
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map.on("contextmenu", (e) => {
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handleClick(e)
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})
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map.on("dblclick", (e) => {
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handleClick(e)
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})
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})
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this.rasterLayer.addCallback((_) =>
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self.setBackground().catch((_) => {
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console.error("Could not set background")
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})
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)
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this.location.addCallbackAndRunD((loc) => {
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self.MoveMapToCurrentLoc(loc)
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})
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this.zoom.addCallbackAndRunD((z) => self.SetZoom(z))
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this.maxbounds.addCallbackAndRun((bbox) => self.setMaxBounds(bbox))
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this.allowMoving.addCallbackAndRun((allowMoving) => self.setAllowMoving(allowMoving))
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this.allowZooming.addCallbackAndRun((allowZooming) => self.setAllowZooming(allowZooming))
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this.bounds.addCallbackAndRunD((bounds) => self.setBounds(bounds))
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}
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/**
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* Convenience constructor
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*/
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public static construct(): {
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map: Store<MLMap>
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ui: SvelteUIElement
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mapproperties: MapProperties
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} {
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const mlmap = new UIEventSource<MlMap>(undefined)
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return {
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map: mlmap,
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ui: new SvelteUIElement(MaplibreMap, {
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map: mlmap,
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}),
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mapproperties: new MapLibreAdaptor(mlmap),
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}
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}
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public static prepareWmsSource(layer: RasterLayerProperties): SourceSpecification {
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return {
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type: "raster",
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// use the tiles option to specify a 256WMS tile source URL
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// https://maplibre.org/maplibre-gl-js-docs/style-spec/sources/
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tiles: [MapLibreAdaptor.prepareWmsURL(layer.url, layer["tile-size"] ?? 256)],
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tileSize: layer["tile-size"] ?? 256,
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minzoom: layer["min_zoom"] ?? 1,
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maxzoom: layer["max_zoom"] ?? 25,
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// scheme: background["type"] === "tms" ? "tms" : "xyz",
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}
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}
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/**
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* Prepares an ELI-URL to be compatible with mapbox
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*/
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private static prepareWmsURL(url: string, size: number = 256): string {
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// ELI: LAYERS=OGWRGB13_15VL&STYLES=&FORMAT=image/jpeg&CRS={proj}&WIDTH={width}&HEIGHT={height}&BBOX={bbox}&VERSION=1.3.0&SERVICE=WMS&REQUEST=GetMap
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// PROD: SERVICE=WMS&REQUEST=GetMap&LAYERS=OGWRGB13_15VL&STYLES=&FORMAT=image/jpeg&TRANSPARENT=false&VERSION=1.3.0&WIDTH=256&HEIGHT=256&CRS=EPSG:3857&BBOX=488585.4847988467,6590094.830634755,489196.9810251281,6590706.32686104
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const toReplace = {
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"{bbox}": "{bbox-epsg-3857}",
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"{proj}": "EPSG:3857",
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"{width}": "" + size,
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"{height}": "" + size,
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"{zoom}": "{z}",
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}
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for (const key in toReplace) {
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url = url.replace(new RegExp(key), toReplace[key])
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}
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const subdomains = url.match(/\{switch:([a-zA-Z0-9,]*)}/)
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if (subdomains !== null) {
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const options = subdomains[1].split(",")
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const option = options[Math.floor(Math.random() * options.length)]
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url = url.replace(subdomains[0], option)
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}
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return url
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}
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async exportAsPng(): Promise<Blob> {
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const map = this._maplibreMap.data
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if (map === undefined) {
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return undefined
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}
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function setDPI(canvas, dpi) {
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// Set up CSS size.
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canvas.style.width = canvas.style.width || canvas.width + "px"
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canvas.style.height = canvas.style.height || canvas.height + "px"
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// Resize canvas and scale future draws.
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const scaleFactor = dpi / 96
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canvas.width = Math.ceil(canvas.width * scaleFactor)
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canvas.height = Math.ceil(canvas.height * scaleFactor)
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const ctx = canvas.getContext("2d")
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ctx?.scale(scaleFactor, scaleFactor)
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}
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// Total hack - see https://stackoverflow.com/questions/42483449/mapbox-gl-js-export-map-to-png-or-pdf
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const drawOn = document.createElement("canvas")
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drawOn.width = document.documentElement.clientWidth
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drawOn.height = document.documentElement.clientHeight
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setDPI(drawOn, 4 * 96)
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const destinationCtx = drawOn.getContext("2d")
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{
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// First, we draw the maplibre-map onto the canvas. This does not export markers
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// Inspiration by https://github.com/mapbox/mapbox-gl-js/issues/2766
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const promise = new Promise<void>((resolve) => {
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map.once("render", () => {
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destinationCtx.drawImage(map.getCanvas(), 0, 0)
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resolve()
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})
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})
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while (!map.isStyleLoaded()) {
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console.log("Waiting to fully load the style...")
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await Utils.waitFor(100)
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}
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map.triggerRepaint()
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await promise
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// Reset the canvas width and height
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map.resize()
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}
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{
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// now, we draw the markers on top of the map
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/* We use html2canvas for this, but disable the map canvas object itself:
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* it cannot deal with this canvas object.
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*
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* We also have to patch up a few more objects
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* */
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const container = map.getCanvasContainer()
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const origHeight = container.style.height
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const origStyle = map.getCanvas().style.display
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try {
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map.getCanvas().style.display = "none"
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if (!container.style.height) {
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container.style.height = document.documentElement.clientHeight + "px"
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}
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await html2canvas(map.getCanvasContainer(), {
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backgroundColor: "#00000000",
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canvas: drawOn,
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})
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} catch (e) {
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console.error(e)
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} finally {
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map.getCanvas().style.display = origStyle
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container.style.height = origHeight
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}
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}
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// At last, we return the actual blob
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return new Promise<Blob>((resolve) => drawOn.toBlob((data) => resolve(data)))
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}
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private updateStores() {
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const map = this._maplibreMap.data
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if (!map) {
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return
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}
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const dt = this.location.data
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dt.lon = map.getCenter().lng
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dt.lat = map.getCenter().lat
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this.location.ping()
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this.zoom.setData(Math.round(map.getZoom() * 10) / 10)
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const bounds = map.getBounds()
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const bbox = new BBox([
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[bounds.getEast(), bounds.getNorth()],
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[bounds.getWest(), bounds.getSouth()],
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])
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this.bounds.setData(bbox)
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}
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private SetZoom(z: number) {
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const map = this._maplibreMap.data
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if (!map || z === undefined) {
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return
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}
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if (Math.abs(map.getZoom() - z) > 0.01) {
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map.setZoom(z)
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}
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}
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private MoveMapToCurrentLoc(loc: { lat: number; lon: number }) {
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const map = this._maplibreMap.data
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if (!map || loc === undefined) {
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return
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}
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const center = map.getCenter()
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if (center.lng !== loc.lon || center.lat !== loc.lat) {
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map.setCenter({ lng: loc.lon, lat: loc.lat })
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}
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}
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private async awaitStyleIsLoaded(): Promise<void> {
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const map = this._maplibreMap.data
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if (map === undefined) {
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return
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}
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while (!map?.isStyleLoaded()) {
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await Utils.waitFor(250)
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}
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}
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private removeCurrentLayer(map: MLMap) {
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if (this._currentRasterLayer) {
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// hide the previous layer
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map.removeLayer(this._currentRasterLayer)
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map.removeSource(this._currentRasterLayer)
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}
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}
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private async setBackground() {
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const map = this._maplibreMap.data
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if (map === undefined) {
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return
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}
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const background: RasterLayerProperties = this.rasterLayer?.data?.properties
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if (background !== undefined && this._currentRasterLayer === background.id) {
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// already the correct background layer, nothing to do
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return
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}
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// await this.awaitStyleIsLoaded()
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if (background !== this.rasterLayer?.data?.properties) {
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// User selected another background in the meantime... abort
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return
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}
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if (background !== undefined && this._currentRasterLayer === background.id) {
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// already the correct background layer, nothing to do
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return
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}
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if (!background?.url) {
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// no background to set
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this.removeCurrentLayer(map)
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this._currentRasterLayer = undefined
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return
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}
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map.addSource(background.id, MapLibreAdaptor.prepareWmsSource(background))
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map.addLayer(
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{
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id: background.id,
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type: "raster",
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source: background.id,
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paint: {},
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},
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background.category === "osmbasedmap" || background.category === "map"
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? undefined
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: "aeroway_fill"
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)
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await this.awaitStyleIsLoaded()
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this.removeCurrentLayer(map)
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this._currentRasterLayer = background?.id
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}
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private setMaxBounds(bbox: undefined | BBox) {
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const map = this._maplibreMap.data
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if (map === undefined) {
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return
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}
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if (bbox) {
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map?.setMaxBounds(bbox.toLngLat())
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} else {
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map?.setMaxBounds(null)
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}
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}
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private setAllowMoving(allow: true | boolean | undefined) {
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const map = this._maplibreMap.data
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if (map === undefined) {
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return
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}
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if (allow === false) {
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for (const id of MapLibreAdaptor.maplibre_control_handlers) {
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map[id].disable()
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}
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} else {
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for (const id of MapLibreAdaptor.maplibre_control_handlers) {
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map[id].enable()
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}
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}
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}
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private setMinzoom(minzoom: number) {
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const map = this._maplibreMap.data
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if (map === undefined) {
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return
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}
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map.setMinZoom(minzoom)
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}
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private setMaxzoom(maxzoom: number) {
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const map = this._maplibreMap.data
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if (map === undefined) {
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return
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}
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map.setMaxZoom(maxzoom)
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}
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private setAllowZooming(allow: true | boolean | undefined) {
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const map = this._maplibreMap.data
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if (map === undefined) {
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return
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}
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if (allow === false) {
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for (const id of MapLibreAdaptor.maplibre_zoom_handlers) {
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map[id].disable()
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}
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} else {
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for (const id of MapLibreAdaptor.maplibre_zoom_handlers) {
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map[id].enable()
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}
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}
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}
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private setBounds(bounds: BBox) {
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const map = this._maplibreMap.data
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if (map === undefined || bounds === undefined) {
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return
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}
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const oldBounds = map.getBounds()
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const e = 0.0000001
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const hasDiff =
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Math.abs(oldBounds.getWest() - bounds.getWest()) > e &&
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Math.abs(oldBounds.getEast() - bounds.getEast()) > e &&
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Math.abs(oldBounds.getNorth() - bounds.getNorth()) > e &&
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Math.abs(oldBounds.getSouth() - bounds.getSouth()) > e
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if (!hasDiff) {
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return
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}
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map.fitBounds(bounds.toLngLat())
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}
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}
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