app/assets/javascripts/routing_engines/graphhopper.js

   1 GraphHopperEngine = function(vehicleName, vehicleParam, locale) {
   2     this.vehicleName = vehicleName;
   3     this.vehicleParam = vehicleParam;
   4     //At this point the local system isn't correctly initialised yet, so we don't have accurate information about current locale
   5     this.locale = locale;
   6     if (!locale)
   7         this.locale = "en";
   8 };
   9
  10 GraphHopperEngine.prototype.createConfig = function() {
  11     var that = this;
  12     return {
  13         name: "javascripts.directions.engines.graphhopper_"+this.vehicleName.toLowerCase(),
  14             creditline: '<a href="http://graphhopper.com/" target="_blank">Graphhopper</a>',
  15         draggable: false,
  16         _hints: {},
  17         getRoute: function(isFinal, points) {
  18             // documentation
  19             // https://github.com/graphhopper/graphhopper/blob/master/docs/web/api-doc.md
  20             var url = "http://graphhopper.com/api/1/route?"
  21                     + that.vehicleParam
  22                     + "&locale=" + I18n.currentLocale()
  23                     + "&key=LijBPDQGfu7Iiq80w3HzwB4RUDJbMbhs6BU0dEnn";
  24
  25             for (var i = 0; i < points.length; i++) {
  26                 var pair = points[i].join(',');
  27                 url += "&point=" + pair;
  28             }
  29             if (isFinal)
  30                 url += "&instructions=true";
  31             // GraphHopper supports json too
  32             this.requestJSONP(url + "&type=jsonp&callback=");
  33         },
  34         gotRoute: function(router, data) {
  35             if (!data.paths || data.paths.length == 0)
  36                 return false;
  37
  38             // Draw polyline
  39             var path = data.paths[0];
  40             var line = L.PolylineUtil.decode(path.points);
  41             router.setPolyline(line);
  42             // Assemble instructions
  43             var steps = [];
  44             var len = path.instructions.length;
  45             for (i = 0; i < len; i++) {
  46                 var instr = path.instructions[i];
  47                 var instrCode = (i === len - 1) ? 15 : this.GH_INSTR_MAP[instr.sign];
  48                 var instrText = "<b>" + (i + 1) + ".</b> ";
  49                 instrText += instr.text;
  50                 var latLng = line[instr.interval[0]];
  51                 var distInMeter = instr.distance;
  52                 steps.push([{lat: latLng.lat, lng: latLng.lng}, instrCode, instrText, distInMeter, []]); // TODO does graphhopper map instructions onto line indices?
  53             }
  54             router.setItinerary({ steps: steps, distance: path.distance, time: path.time / 1000 });
  55             return true;
  56         },
  57         GH_INSTR_MAP: {
  58             "-3": 6, // sharp left
  59             "-2": 7, // left
  60             "-1": 8, // slight left
  61             0: 0, // straight
  62             1: 1, // slight right
  63             2: 2, // right
  64             3: 3, // sharp right
  65             4: -1, // finish reached
  66             5: -1 // via reached
  67         }
  68     };
  69 };
  70
  71 OSM.RoutingEngines.add(false, new GraphHopperEngine("Bicycle", "vehicle=bike").createConfig());
  72 OSM.RoutingEngines.add(false, new GraphHopperEngine("Foot", "vehicle=foot").createConfig());