pilgrim/src/main/webapp/lib.js

const lib = new function () {

    let ghbase = ""

    /**
     * Initialize Map etc
     */
    this.init = function () {
        $.get("/config", function(result) { ghbase = result["ghbase"]; });

		const map = new maplibregl.Map({ container: 'map',
			style: 'spacedon.json',
			center: [13, 51],
			zoom: 6
		}); 
		map.addControl(new maplibregl.NavigationControl());

        const startMarker = new maplibregl.Marker({color: "#00FF00", draggable: true}).setLngLat([0, 0]);
        const finishMarker = new maplibregl.Marker({color: "#FF0000", draggable: true}).setLngLat([0, 0]);
        startMarker.on("dragend", function() {lib.doRouting(map, startMarker.getLngLat(), finishMarker.getLngLat());});
        finishMarker.on("dragend", function() {lib.doRouting(map, startMarker.getLngLat(), finishMarker.getLngLat());});
		const viaMarkers = new Array();

		map.on('mousemove', function (e) {
			var features = map.queryRenderedFeatures(e.point);
			// Limit the number of properties we're displaying for
			// legibility and performance
			var displayProperties = [ 'type', 'properties', 'id', 'layer', 'source', 'sourceLayer', 'state' ];
			var displayFeatures = features.map(function (feat) {
				var displayFeat = {};
				displayProperties.forEach(function (prop) {
					displayFeat[prop] = feat[prop];
				});
				return displayFeat;
			});
			document.getElementById('features').innerHTML = JSON.stringify( displayFeatures, null, 2 );
		});
		map.on('click', function (e) {
			let coordinates = e.lngLat;

			// Ensure that if the map is zoomed out such that multiple
			// copies of the feature are visible, the popup appears
			// over the copy being pointed to.
			while (Math.abs(e.lngLat.lng - coordinates[0]) > 180) {
				coordinates[0] += e.lngLat.lng > coordinates[0] ? 360 : -360;
			}

			const contextmenu = new maplibregl.Popup()
				.setLngLat(coordinates)
				.setHTML('<button id="btn-feat">feature</button></br><button id="btn-start">start</button></br><button id="btn-via">via</button></br><button id="btn-finish">finish</button>')
				.addTo(map);

            let featbtn = document.getElementById("btn-feat");
            featbtn.onclick = function () {
                contextmenu.remove();
                const features = map.queryRenderedFeatures(e.point);
                const prop = features.map(function (feat) {
                    return feat["properties"];
                });
                const featPopup = new maplibregl.Popup()
                    .setLngLat(coordinates)
                    .setHTML(JSON.stringify(prop))
                    .addTo(map);
            };
            let startbtn = document.getElementById("btn-start");
            startbtn.onclick = function () {
                contextmenu.remove();
                startMarker.setLngLat([coordinates.lng, coordinates.lat]).addTo(map);
                startMarker.onMap = true;
                if (finishMarker.onMap) {
                    lib.doRouting(map, coordinates, finishMarker.getLngLat());
                }
            };
            let finishbtn = document.getElementById("btn-finish");
            finishbtn.onclick = function () {
                contextmenu.remove();
                finishMarker.setLngLat([coordinates.lng, coordinates.lat]).addTo(map);
                finishMarker.onMap = true;
                if (startMarker.onMap) {
                    lib.doRouting(map, startMarker.getLngLat(), coordinates);
                }
            };
		});
    };

    this.doRouting = function (map, start, finish, vias = undefined, vehicle = "foot") {
        const s = [start.lat, start.lng];
        let data = {
            points: [
                [start.lng, start.lat]
            ],
            profile: vehicle,
            points_encoded: false
        };
        if (vias != undefined && vias.length > 0) {

        }
        data.points.push([finish.lng, finish.lat])
        $.ajax({
            type: "POST",
            url: ghbase + "/route",
            data: JSON.stringify(data),
            contentType: "application/json",
            success: function (result) {
                if(map.getLayer("route") !== undefined) {
                    map.removeLayer("route");
                }
                if(map.getSource("ghroute") !== undefined) {
                    map.removeSource("ghroute");
                }

                map.addSource("ghroute", {
                    "type": "geojson",
                    "data": {
                        "type": "Feature",
                        "geometry": result.paths[0].points
                    }
                });
                map.addLayer({
                    "id": "route",
                    "type": "line",
                    "source": "ghroute",
                    "layout": {
                        "line-join": "round",
                        "line-cap": "round"
                    },
                    "paint": {
                        "line-color": "#f00",
                        "line-width": 9
                    }
                });
            },
            dataType: "json"
        });
    };
};