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             var url = "http://graphhopper.com/routing/api/route?"
  19                     + that.vehicleParam
  20                     + "&locale=" + I18n.currentLocale();
  21             for (var i = 0; i < points.length; i++) {
  22                 var pair = points[i].join(',');
  23                 url += "&point=" + pair;
  24             }
  25             if (isFinal)
  26                 url += "&instructions=true";
  27             // GraphHopper supports json too
  28             this.requestJSONP(url + "&type=jsonp&callback=");
  29         },
  30         gotRoute: function(router, data) {
  31             if (!data.info.routeFound) {
  32                 return false;
  33             }
  34             // Draw polyline
  35             var line = L.PolylineUtil.decode(data.route.coordinates);
  36             router.setPolyline(line);
  37             // Assemble instructions
  38             var steps = [];
  39             var instr = data.route.instructions;
  40             for (i = 0; i < instr.descriptions.length; i++) {
  41                 var indi = instr.indications[i];
  42                 var instrCode = (i == instr.descriptions.length - 1) ? 15 : this.GH_INSTR_MAP[indi];
  43                 var instrText = "<b>" + (i + 1) + ".</b> ";
  44                 instrText += instr.descriptions[i];
  45                 var latlng = instr.latLngs[i];
  46                 var distInMeter = instr.distances[i];
  47                 steps.push([{lat: latlng[0], lng: latlng[1]}, instrCode, instrText, distInMeter, []]); // TODO does graphhopper map instructions onto line indices?
  48             }
  49             router.setItinerary({ steps: steps, distance: data.route.distance, time: data.route['time']/1000 });
  50             return true;
  51         },
  52         GH_INSTR_MAP: {
  53             "-3": 6, // sharp left
  54             "-2": 7, // left
  55             "-1": 8, // slight left
  56             0: 0, // straight
  57             1: 1, // slight right
  58             2: 2, // right
  59             3: 3 // sharp right
  60         }
  61     };
  62 };
  63
  64 OSM.RoutingEngines.add(false, new GraphHopperEngine("Bicycle", "vehicle=bike").createConfig());
  65 OSM.RoutingEngines.add(false, new GraphHopperEngine("Foot", "vehicle=foot").createConfig());