kopia lustrzana https://github.com/FacilMap/facilmap
127 wiersze
3.3 KiB
JavaScript
127 wiersze
3.3 KiB
JavaScript
var request = require("request-promise");
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var utils = require("./utils");
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var config = require("../config");
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var ROUTING_URL = "https://api.mapbox.com/directions/v5/mapbox";
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// The OpenLayers resolution for zoom level 1 is 0.7031249999891753
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// and for zoom level 20 0.0000013411044763239684
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// This is the distance of one pixel on the map in degrees
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// The resolution for zoom level 19 is the resolution for zoom level 20 times 2, and so on.
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// As we don’t need one route point per pixel, we raise the value a bit
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var RESOLUTION_20 = 0.0000013411044763239684 * 4;
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var ROUTING_TYPES = {
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car: "driving",
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bicycle: "cycling",
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pedestrian: "walking"
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};
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var ACCESS_TOKEN = "pk.eyJ1IjoiY2RhdXRoIiwiYSI6ImNpdTYwMmZwMDAwM3AyenBhemM5NHM4ZmgifQ.93z6yuzcsxt3eZk9NxPGHA";
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function calculateRouting(points, mode, simple) {
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var coords = [ ];
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for(var i=0; i<points.length; i++)
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coords.push(points[i].lon + "," + points[i].lat);
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var url = ROUTING_URL + "/" + ROUTING_TYPES[mode] + "/" + coords.join(";")
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+ "?alternatives=false"
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+ "&steps=false"
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+ "&geometries=geojson"
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+ "&overview=" + (simple ? "simplified" : "full")
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+ "&access_token=" + encodeURIComponent(ACCESS_TOKEN);
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return request.get({
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url: url,
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json: true,
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gzip: true,
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headers: {
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'User-Agent': config.userAgent
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}
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}).then(function(body) {
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if(!body || (body.code == "OK" && (!body.legs || !body.legs[0])))
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throw "Invalid response from routing server.";
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if(body.code != 'Ok')
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throw "Route could not be calculated (" + body.code + ").";
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var ret = {
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trackPoints : body.routes[0].geometry.coordinates.map(function(it) { return { lat: it[1], lon: it[0] }; }),
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distance: body.routes[0].distance/1000,
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time: body.routes[0].duration
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};
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if(!simple)
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_calculateZoomLevels(ret.trackPoints);
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return ret;
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});
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}
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function _calculateZoomLevels(points) {
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var segments = [ ];
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var dist = 0;
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for(var i=0; i<points.length; i++) {
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if(i > 0)
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dist += _distance(points[i-1], points[i]);
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segments[i] = dist / RESOLUTION_20;
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points[i].zoom = null;
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if(i != 0 && i != points.length-1) {
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var lastSegments = segments[i-1];
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var thisSegments = segments[i];
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for(var j = 0; j < 20; j++) {
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lastSegments = Math.floor(lastSegments / 2);
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thisSegments = Math.floor(thisSegments / 2);
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if(lastSegments == thisSegments) {
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points[i].zoom = 20 - j;
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break;
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}
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}
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}
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if(points[i].zoom == null)
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points[i].zoom = 1;
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}
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}
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function _distance(pos1, pos2) {
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return Math.sqrt(Math.pow(pos1.lon-pos2.lon, 2) + Math.pow(pos1.lat-pos2.lat, 2));
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}
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function prepareForBoundingBox(points, bbox) {
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points = _filterByZoom(points, bbox.zoom);
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points = _filterByBbox(points, bbox);
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return points;
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}
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function _filterByZoom(points, zoom) {
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var ret = [ ];
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for(var i=0; i<points.length; i++) {
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if(points[i].zoom <= zoom)
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ret.push(points[i]);
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}
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return ret;
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}
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function _filterByBbox(points, bbox) {
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var ret = [ ];
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var lastIn = false;
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for(var i=0; i<points.length; i++) {
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var isIn = utils.isInBbox(points[i], bbox);
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if(isIn && !lastIn && i >= 1) {
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ret.push(points[i-1]);
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}
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if(isIn || lastIn)
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ret.push(points[i]);
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lastIn = isIn;
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}
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return ret;
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}
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exports.calculateRouting = calculateRouting;
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exports._calculateZoomLevels = _calculateZoomLevels;
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exports.prepareForBoundingBox = prepareForBoundingBox; |