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
  18     getRoute: function (isFinal, points) {
  19       // documentation
  20       // https://github.com/graphhopper/graphhopper/blob/master/docs/web/api-doc.md
  21       var url = "http://graphhopper.com/api/1/route?"
  22         + that.vehicleParam
  23         + "&locale=" + I18n.currentLocale()
  24         + "&key=LijBPDQGfu7Iiq80w3HzwB4RUDJbMbhs6BU0dEnn";
  25
  26       for (var i = 0; i < points.length; i++) {
  27         var pair = points[i].join(',');
  28         url += "&point=" + pair;
  29       }
  30       if (isFinal)
  31         url += "&instructions=true";
  32       // GraphHopper supports json too
  33       this.requestJSONP(url + "&type=jsonp&callback=");
  34     },
  35
  36     gotRoute: function (router, data) {
  37       if (!data.paths || data.paths.length == 0)
  38         return false;
  39
  40       // Draw polyline
  41       var path = data.paths[0];
  42       var line = L.PolylineUtil.decode(path.points);
  43       router.setPolyline(line);
  44       // Assemble instructions
  45       var steps = [];
  46       var len = path.instructions.length;
  47       for (i = 0; i < len; i++) {
  48         var instr = path.instructions[i];
  49         var instrCode = (i === len - 1) ? 15 : this.GH_INSTR_MAP[instr.sign];
  50         var instrText = "<b>" + (i + 1) + ".</b> ";
  51         instrText += instr.text;
  52         var latLng = line[instr.interval[0]];
  53         var distInMeter = instr.distance;
  54         steps.push([
  55           {lat: latLng.lat, lng: latLng.lng},
  56           instrCode,
  57           instrText,
  58           distInMeter,
  59           []
  60         ]); // TODO does graphhopper map instructions onto line indices?
  61       }
  62       router.setItinerary({ steps: steps, distance: path.distance, time: path.time / 1000 });
  63       return true;
  64     },
  65
  66     GH_INSTR_MAP: {
  67       "-3": 6, // sharp left
  68       "-2": 7, // left
  69       "-1": 8, // slight left
  70       0: 0, // straight
  71       1: 1, // slight right
  72       2: 2, // right
  73       3: 3, // sharp right
  74       4: -1, // finish reached
  75       5: -1 // via reached
  76     }
  77   };
  78 };
  79
  80 OSM.RoutingEngines.add(false, new GraphHopperEngine("Bicycle", "vehicle=bike").createConfig());
  81 OSM.RoutingEngines.add(false, new GraphHopperEngine("Foot", "vehicle=foot").createConfig());