app/assets/javascripts/routing_engines/graphhopper.js

   1 GraphHopperEngine = function(vehicleName, vehicleParam, locale) {
   2     this.vehicleName = vehicleName;
   3     this.vehicleParam = vehicleParam;
   4     this.locale = locale;
   5     if (!locale)
   6         this.locale = "en";
   7 };
   8
   9 GraphHopperEngine.prototype.createConfig = function() {
  10     var that = this;
  11     return {
  12         name: "javascripts.directions.engines.graphhopper_"+this.vehicleName.toLowerCase(),
  13         draggable: false,
  14         _hints: {},
  15         getRoute: function(isFinal, points) {
  16             var url = "http://graphhopper.com/routing/api/route?"
  17                     + that.vehicleParam
  18                     + "&locale=" + that.locale;
  19             for (var i = 0; i < points.length; i++) {
  20                 var pair = points[i].join(',');
  21                 url += "&point=" + pair;
  22             }
  23             if (isFinal)
  24                 url += "&instructions=true";
  25             // GraphHopper supports json too
  26             this.requestJSONP(url + "&type=jsonp&callback=");
  27         },
  28         gotRoute: function(router, data) {
  29             if (!data.info.routeFound) {
  30                 return false;
  31             }
  32             // Draw polyline
  33             var line = L.PolylineUtil.decode(data.route.coordinates);
  34             router.setPolyline(line);
  35             // Assemble instructions
  36             var steps = [];
  37             var instr = data.route.instructions;
  38             for (i = 0; i < instr.descriptions.length; i++) {
  39                 var indi = instr.indications[i];
  40                 var instrCode = (i == instr.descriptions.length - 1) ? 15 : this.GH_INSTR_MAP[indi];
  41                 var instrText = "<b>" + (i + 1) + ".</b> ";
  42                 instrText += instr.descriptions[i];
  43                 var latlng = instr.latLngs[i];
  44                 var distInMeter = instr.distances[i];
  45                 steps.push([{lat: latlng[0], lng: latlng[1]}, instrCode, instrText, distInMeter, []]); // TODO does graphhopper map instructions onto line indices?
  46             }
  47             router.setItinerary({ steps: steps, distance: data.route.distance, time: data.route['time']/1000 });
  48             return true;
  49         },
  50         GH_INSTR_MAP: {
  51             "-3": 6, // sharp left
  52             "-2": 7, // left
  53             "-1": 8, // slight left
  54             0: 0, // straight
  55             1: 1, // slight right
  56             2: 2, // right
  57             3: 3 // sharp right
  58         }
  59     };
  60 };
  61
  62 OSM.RoutingEngines.add(false, new GraphHopperEngine("Bicycle", "vehicle=bike").createConfig());
  63 OSM.RoutingEngines.add(false, new GraphHopperEngine("Foot", "vehicle=foot").createConfig());