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

   1 function GraphHopperEngine(id, vehicleType) {
   2   var GH_INSTR_MAP = {
   3     "-3": 7, // sharp left
   4     "-2": 6, // left
   5     "-1": 5, // slight left
   6     0: 0, // straight
   7     1: 1, // slight right
   8     2: 2, // right
   9     3: 3, // sharp right
  10     4: 14, // finish reached
  11     5: 14, // via reached
  12     6: 10 // roundabout
  13   };
  14
  15   return {
  16     id: id,
  17     creditline: "<a href=\"https://www.graphhopper.com/\" target=\"_blank\">Graphhopper</a>",
  18     draggable: false,
  19
  20     getRoute: function (points, callback) {
  21       // GraphHopper Directions API documentation
  22       // https://graphhopper.com/api/1/docs/routing/
  23       return $.ajax({
  24         url: OSM.GRAPHHOPPER_URL,
  25         data: {
  26           vehicle: vehicleType,
  27           locale: I18n.currentLocale(),
  28           key: "LijBPDQGfu7Iiq80w3HzwB4RUDJbMbhs6BU0dEnn",
  29           "ch.disable": vehicleType === "car",
  30           elevation: false,
  31           instructions: true,
  32           point: points.map(function (p) { return p.lat + "," + p.lng; })
  33         },
  34         traditional: true,
  35         dataType: "json",
  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) ? 14 : 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             var lineseg = [];
  53             for (var j = instr.interval[0]; j <= instr.interval[1]; j++) {
  54               lineseg.push({lat: line[j][0], lng: line[j][1]});
  55             }
  56             steps.push([
  57               {lat: latLng[0], lng: latLng[1]},
  58               instrCode,
  59               instrText,
  60               distInMeter,
  61               lineseg
  62             ]); // TODO does graphhopper map instructions onto line indices?
  63           }
  64
  65           callback(false, {
  66             line: line,
  67             steps: steps,
  68             distance: path.distance,
  69             time: path.time / 1000,
  70             ascend: path.ascend,
  71             descend: path.descend
  72           });
  73         },
  74         error: function () {
  75           callback(true);
  76         }
  77       });
  78     }
  79   };
  80 }
  81
  82 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_car", "car"), true);
  83 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_bicycle", "bike"), true);
  84 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_foot", "foot"), true);