app/assets/javascripts/index/directions_engines/graphhopper.js

   1 function GraphHopperEngine(vehicleName, vehicleParam) {
   2   var GH_INSTR_MAP = {
   3     "-3": 6, // sharp left
   4     "-2": 7, // left
   5     "-1": 8, // slight left
   6     0: 0, // straight
   7     1: 1, // slight right
   8     2: 2, // right
   9     3: 3, // sharp right
  10     4: -1, // finish reached
  11     5: -1 // via reached
  12   };
  13
  14   return {
  15     name: "javascripts.directions.engines.graphhopper_" + vehicleName.toLowerCase(),
  16     creditline: '<a href="http://graphhopper.com/" target="_blank">Graphhopper</a>',
  17     draggable: false,
  18
  19     getRoute: function (isFinal, points, callback) {
  20       // documentation
  21       // https://github.com/graphhopper/graphhopper/blob/master/docs/web/api-doc.md
  22       var url = "http://graphhopper.com/api/1/route?"
  23         + vehicleParam
  24         + "&locale=" + I18n.currentLocale()
  25         + "&key=LijBPDQGfu7Iiq80w3HzwB4RUDJbMbhs6BU0dEnn"
  26         + "&type=jsonp";
  27
  28       for (var i = 0; i < points.length; i++) {
  29         url += "&point=" + points[i].lat + ',' + points[i].lng;
  30       }
  31
  32       if (isFinal)
  33         url += "&instructions=true";
  34
  35       $.ajax({
  36         url: url,
  37         dataType: 'jsonp',
  38         success: function (data) {
  39           if (!data.paths || data.paths.length == 0)
  40             return callback(true);
  41
  42           var path = data.paths[0];
  43           var line = L.PolylineUtil.decode(path.points);
  44
  45           var steps = [];
  46           var len = path.instructions.length;
  47           for (var i = 0; i < len; i++) {
  48             var instr = path.instructions[i];
  49             var instrCode = (i === len - 1) ? 15 : 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
  63           callback(null, {
  64             line: line,
  65             steps: steps,
  66             distance: path.distance,
  67             time: path.time / 1000
  68           });
  69         }
  70       });
  71     }
  72   };
  73 }
  74
  75 OSM.Directions.addEngine(GraphHopperEngine("Bicycle", "vehicle=bike"), false);
  76 OSM.Directions.addEngine(GraphHopperEngine("Foot", "vehicle=foot"), false);