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

   1 function GraphHopperEngine(id, 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     id: id,
  16     creditline: '<a href="https://graphhopper.com/" target="_blank">Graphhopper</a>',
  17     draggable: false,
  18
  19     getRoute: function (points, callback) {
  20       // documentation
  21       // https://github.com/graphhopper/graphhopper/blob/master/docs/web/api-doc.md
  22       var url = "https://graphhopper.com/api/1/route?"
  23         + vehicleParam
  24         + "&locale=" + I18n.currentLocale()
  25         + "&key=LijBPDQGfu7Iiq80w3HzwB4RUDJbMbhs6BU0dEnn"
  26         + "&type=jsonp"
  27         + "&instructions=true";
  28
  29       for (var i = 0; i < points.length; i++) {
  30         url += "&point=" + points[i].lat + ',' + points[i].lng;
  31       }
  32
  33       $.ajax({
  34         url: url,
  35         dataType: 'jsonp',
  36         success: function (data) {
  37           if (!data.paths || data.paths.length == 0)
  38             return callback(true);
  39
  40           var path = data.paths[0];
  41           var line = L.PolylineUtil.decode(path.points);
  42
  43           var steps = [];
  44           var len = path.instructions.length;
  45           for (var i = 0; i < len; i++) {
  46             var instr = path.instructions[i];
  47             var instrCode = (i === len - 1) ? 15 : 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([
  53               {lat: latLng.lat, lng: latLng.lng},
  54               instrCode,
  55               instrText,
  56               distInMeter,
  57               []
  58             ]); // TODO does graphhopper map instructions onto line indices?
  59           }
  60
  61           callback(null, {
  62             line: line,
  63             steps: steps,
  64             distance: path.distance,
  65             time: path.time / 1000
  66           });
  67         }
  68       });
  69     }
  70   };
  71 }
  72
  73 OSM.Directions.addEngine(GraphHopperEngine("graphhopper_bicycle", "vehicle=bike"), false);
  74 OSM.Directions.addEngine(GraphHopperEngine("graphhopper_foot", "vehicle=foot"), false);