com.graphhopper.maps.isochrone.index.js Maven / Gradle / Ivy
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Use the GraphHopper routing engine as a web-service
/*
* Licensed to GraphHopper GmbH under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*
* GraphHopper GmbH licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var menu = new Vue({
el: '#menu',
data: {
layer: 'raster',
showGraph: false,
isochroneRadius: 600,
showSpt: false,
isochronePoint: undefined,
isochroneProfile: undefined,
isochroneProfiles: []
},
methods: {
changeLayer: function (event) {
this.showGraph = false;
setGHMvtVisible(map, false);
removeIsoLayers();
setLayer(map, event.target.id);
},
toggleGHMvt: function (event) {
setGHMvtVisible(map, event.target.checked);
},
updateIsochrone: function (event) {
if (!this.isochronePoint)
return;
var coordinates = this.isochronePoint.split(',')
.map(item => item.trim())
.map(parseFloat);
if (coordinates.length != 2) {
console.error('invalid point: ' + this.isochronePoint);
} else {
_updateIsochrone({ lng: coordinates[1], lat: coordinates[0] });
}
}
}
});
var mapTilerKey = 'ADD_YOUR_KEY_HERE';
var rasterStyle = {
'version': 8,
'sources': {
'raster-tiles-source': {
'type': 'raster',
'tiles': [
'https://a.tile.openstreetmap.de/{z}/{x}/{y}.png',
'https://b.tile.openstreetmap.de/{z}/{x}/{y}.png',
'https://c.tile.openstreetmap.de/{z}/{x}/{y}.png'
]
}
},
'layers': [
{
'id': 'raster-tiles',
'type': 'raster',
'source': 'raster-tiles-source'
}
]
};
var vectorStyle = 'https://api.maptiler.com/maps/basic/style.json?key=' + mapTilerKey;
fetch('/info')
.then(response => response.json())
.then(json => {
_updateProfiles(json.profiles);
_drawMap(json.bbox);
})
.catch(e => console.error('Could not receive bbox from GH server', e));
function _updateProfiles(profiles) {
menu.isochroneProfiles = profiles.map(p => p.name)
menu.isochroneProfile = menu.isochroneProfiles[0]
}
// the mapbox map object used in various places here
var map;
function _drawMap(bbox) {
map = new mapboxgl.Map({
container: 'map',
style: rasterStyle,
});
map.fitBounds([
[bbox[0], bbox[1]],
[bbox[2], bbox[3]]
], {
animate: false,
padding: 50
});
map.on('style.load', function addGHMvt() {
// add GraphHopper vector tiles of road network. this is also called when we change the style
map.addSource('gh-mvt', {
type: 'vector',
tiles: ['http://' + window.location.host + '/mvt/{z}/{x}/{y}.mvt']
});
var boundsPolygon = [[bbox[0], bbox[1]], [bbox[2], bbox[1]], [bbox[2], bbox[3]], [bbox[0], bbox[3]], [bbox[0], bbox[1]]];
map.addLayer({
'id': 'gh-bounds',
'type': 'line',
'source': {
'type': 'geojson',
'data': {
'type': 'Feature',
'geometry': {
'type': 'Polygon',
'coordinates': [boundsPolygon]
}
}
},
'layout': {},
'paint': {
'line-color': 'grey',
'line-width': 1.5
}
}, getFirstSymbolLayer(map));
map.addLayer({
'id': 'gh',
'type': 'line',
'source': 'gh-mvt',
'source-layer': 'roads',
'paint': {
'line-color': [
'match',
['get', 'road_class'],
'motorway', 'red',
'primary', 'orange',
'trunk', 'orange',
'secondary', 'yellow',
/*other*/ 'grey'
]
},
'layout': {
'visibility': 'none'
}
// we make sure the map labels stay on top
}, getFirstSymbolLayer(map));
});
map.on('click', function (e) {
_updateIsochrone(e.lngLat);
});
}
function _updateIsochrone(lngLat) {
menu.isochronePoint = lngLat.lat.toFixed(6) + "," + lngLat.lng.toFixed(6);
if (menu.showSpt)
fetchAndDrawSPT(lngLat);
else
fetchAndDrawIsoline(lngLat);
}
function fetchAndDrawSPT(point) {
// fetch GraphHopper isochrone and draw on map
var counter = 0;
var coordinates = [];
var radius = menu.isochroneRadius;
var profile = menu.isochroneProfile;
Papa.parse("http://" + window.location.host + "/spt?profile=" + profile + "&point=" + point.lat + "," + point.lng + "&columns=prev_longitude,prev_latitude,longitude,latitude,distance,time&time_limit=" + radius, {
download: true,
worker: true,
step: function (results) {
var d = results.data;
// skip the first line (column names) and the second (root node)
if (counter > 1)
coordinates.push([[parseFloat(d[0]), parseFloat(d[1])], [parseFloat(d[2]), parseFloat(d[3])]]);
counter++;
},
complete: function () {
var geojson = {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'geometry': {
'type': 'MultiLineString',
'coordinates': coordinates
}
}
]
};
drawIsoLayer(geojson, coordinates);
},
error: function (e) {
console.error('error when trying to show SPT', e);
}
});
}
function fetchAndDrawIsoline(point) {
var radius = menu.isochroneRadius;
var profile = menu.isochroneProfile;
fetch("/isochrone?profile=" + profile + "&point=" + point.lat + "," + point.lng + "&time_limit=" + radius + (profile === "pt" ? "&pt.earliest_departure_time=" + new Date().toISOString() : ""))
.then(response => response.json())
.then(data => {
console.log('isoline took: ' + data.info.took + 'ms');
// since we do not use the buckets parameter there is always just one polygon
drawIsoLayer(data.polygons[0], undefined)
})
.catch(e => {
console.error('error when trying to show isoline', e)
});
}
function drawIsoLayer(geojson, coordinates) {
removeIsoLayers();
var source = map.getSource('isochrone');
if (!source) {
map.addSource('isochrone', {
'type': 'geojson',
'data': geojson
});
} else {
source.setData(geojson);
}
map.addLayer({
'id': 'isochrone-layer',
'type': 'line',
'source': 'isochrone',
'paint': {
'line-color': '#0000e1'
}
}, getFirstSymbolLayer(map));
}
function removeIsoLayers() {
if (map.getLayer('isochrone-layer')) {
map.removeLayer('isochrone-layer');
}
}
function setLayer(map, layerId) {
if (layerId == 'vector') {
map.setStyle(vectorStyle);
} else if (layerId == 'raster') {
map.setStyle(rasterStyle);
}
}
function setGHMvtVisible(map, visible) {
if (visible) {
map.setLayoutProperty('gh', 'visibility', 'visible');
} else {
map.setLayoutProperty('gh', 'visibility', 'none');
}
}
function getFirstSymbolLayer(map) {
var layers = map.getStyle().layers;
// Find the index of the first symbol layer in the map style
for (var i = 0; i < layers.length; i++) {
if (layers[i].type === 'symbol') {
return layers[i].id;
}
}
}