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           "elevation": false,
  30           "instructions": true,
  31           "turn_costs": 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
  41           var path = data.paths[0];
  42           var line = L.PolylineUtil.decode(path.points);
  43
  44           var steps = [];
  45           var len = path.instructions.length;
  46           for (var i = 0; i < len; i++) {
  47             var instr = path.instructions[i];
  48             var instrCode = (i === len - 1) ? 14 : GH_INSTR_MAP[instr.sign];
  49             var instrText = "<b>" + (i + 1) + ".</b> ";
  50             instrText += instr.text;
  51             var latLng = line[instr.interval[0]];
  52             var distInMeter = instr.distance;
  53             var lineseg = [];
  54             for (var j = instr.interval[0]; j <= instr.interval[1]; j++) {
  55               lineseg.push({ lat: line[j][0], lng: line[j][1] });
  56             }
  57             steps.push([
  58               { lat: latLng[0], lng: latLng[1] },
  59               instrCode,
  60               instrText,
  61               distInMeter,
  62               lineseg
  63             ]); // TODO does graphhopper map instructions onto line indices?
  64           }
  65
  66           callback(false, {
  67             line: line,
  68             steps: steps,
  69             distance: path.distance,
  70             time: path.time / 1000,
  71             ascend: path.ascend,
  72             descend: path.descend
  73           });
  74         },
  75         error: function () {
  76           callback(true);
  77         }
  78       });
  79     }
  80   };
  81 }
  82
  83 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_car", "car"), true);
  84 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_bicycle", "bike"), true);
  85 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_foot", "foot"), true);