136 lines
3.5 KiB
JavaScript
136 lines
3.5 KiB
JavaScript
/* Optional elevation addon requires Googlemaps API JS */
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/*global google:true geolib:true require:true module:true elevationResult*/
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/**
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* @param Array Collection of coords [{latitude: 51.510, longitude: 7.1321}, {latitude: 49.1238, longitude: "8° 30' W"}, ...]
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*
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* @return Array [{lat:#lat, lng:#lng, elev:#elev},....]}
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*/
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geolib.getElevation = function() {
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if (typeof window.navigator !== 'undefined') {
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geolib.getElevationClient.apply(this, arguments);
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} else {
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geolib.getElevationServer.apply(this, arguments);
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}
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};
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geolib.getElevationClient = function(coords, cb) {
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if (!window.google) {
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throw new Error("Google maps api not loaded");
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}
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if (coords.length === 0) {
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return cb(null, null);
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}
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if (coords.length === 1) {
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return cb(new Error("getElevation requires at least 2 points."));
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}
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var path = [];
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var keys = geolib.getKeys(coords[0]);
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var latitude = keys.latitude;
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var longitude = keys.longitude;
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for(var i = 0; i < coords.length; i++) {
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path.push(new google.maps.LatLng(
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geolib.useDecimal(coords[i][latitude]),
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geolib.useDecimal(coords[i][longitude])
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));
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}
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var positionalRequest = {
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'path': path,
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'samples': path.length
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};
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var elevationService = new google.maps.ElevationService();
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elevationService.getElevationAlongPath(positionalRequest,function (results, status) {
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geolib.elevationHandler(results, status, coords, keys, cb);
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});
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};
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geolib.getElevationServer = function(coords, cb) {
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if (coords.length === 0) {
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return cb(null, null);
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}
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if (coords.length === 1) {
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return cb(new Error("getElevation requires at least 2 points."));
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}
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var gm = require('googlemaps');
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var path = [];
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var keys = geolib.getKeys(coords[0]);
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//coords[0]
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var latitude = keys.latitude;
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var longitude = keys.longitude;
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for(var i = 0; i < coords.length; i++) {
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path.push(geolib.useDecimal(coords[i][latitude]) + ',' +
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geolib.useDecimal(coords[i][longitude]));
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}
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gm.elevationFromPath(path.join('|'), path.length, function(err, results) {
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geolib.elevationHandler(results.results, results.status, coords, keys, cb);
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});
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},
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geolib.elevationHandler = function(results, status, coords, keys, cb){
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var latsLngsElevs = [];
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var latitude = keys.latitude;
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var longitude = keys.longitude;
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if (status == "OK" ) {
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for (var i = 0; i < results.length; i++) {
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latsLngsElevs.push({
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"lat":coords[i][latitude],
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"lng":coords[i][longitude],
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"elev":results[i].elevation
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});
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}
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cb(null, latsLngsElevs);
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} else {
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cb(new Error("Could not get elevation using Google's API"), elevationResult.status);
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}
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};
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/**
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* @param Array [{lat:#lat, lng:#lng, elev:#elev},....]}
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*
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* @return Number % grade
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*/
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geolib.getGrade = function(coords){
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var keys = geolib.getKeys(coords[0]);
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var elevation = keys.elevation;
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var rise = Math.abs(coords[coords.length-1][elevation] - coords[0][elevation]);
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var run = geolib.getPathLength(coords);
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return Math.floor((rise/run)*100);
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};
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/**
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* @param Array [{lat:#lat, lng:#lng, elev:#elev},....]}
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*
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* @return Object {gain:#gain, loss:#loss}
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*/
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geolib.getTotalElevationGainAndLoss = function(coords){
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var keys = geolib.getKeys(coords[0]);
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var elevation = keys.elevation;
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var gain = 0;
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var loss = 0;
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for(var i = 0; i < coords.length - 1; i++){
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var deltaElev = coords[i][elevation] - coords[i + 1][elevation];
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if (deltaElev > 0) {
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loss += deltaElev;
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} else {
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gain += Math.abs(deltaElev);
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}
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}
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return {
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"gain": gain,
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"loss": loss
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};
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};
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