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     "-7": 19, // keep left
  14     "7": 18 // keep right
  15   };
  16
  17   return {
  18     id: id,
  19     creditline: "<a href=\"https://www.graphhopper.com/\" target=\"_blank\">GraphHopper</a>",
  20     draggable: false,
  21
  22     getRoute: function (points, callback) {
  23       // GraphHopper Directions API documentation
  24       // https://graphhopper.com/api/1/docs/routing/
  25       return $.ajax({
  26         url: OSM.GRAPHHOPPER_URL,
  27         data: {
  28           vehicle: vehicleType,
  29           locale: I18n.currentLocale(),
  30           key: "LijBPDQGfu7Iiq80w3HzwB4RUDJbMbhs6BU0dEnn",
  31           elevation: false,
  32           instructions: true,
  33           turn_costs: vehicleType === "car",
  34           point: points.map(function (p) { return p.lat + "," + p.lng; })
  35         },
  36         traditional: true,
  37         dataType: "json",
  38         success: function (data) {
  39           if (!data.paths || data.paths.length === 0) {
  40             return callback(true);
  41           }
  42
  43           var path = data.paths[0];
  44           var line = L.PolylineUtil.decode(path.points);
  45
  46           var steps = [];
  47           var len = path.instructions.length;
  48           for (var i = 0; i < len; i++) {
  49             var instr = path.instructions[i];
  50             var instrCode = (i === len - 1) ? 14 : GH_INSTR_MAP[instr.sign];
  51             var instrText = "<b>" + (i + 1) + ".</b> ";
  52             instrText += instr.text;
  53             var latLng = line[instr.interval[0]];
  54             var distInMeter = instr.distance;
  55             var lineseg = [];
  56             for (var j = instr.interval[0]; j <= instr.interval[1]; j++) {
  57               lineseg.push({ lat: line[j][0], lng: line[j][1] });
  58             }
  59             steps.push([
  60               { lat: latLng[0], lng: latLng[1] },
  61               instrCode,
  62               instrText,
  63               distInMeter,
  64               lineseg
  65             ]); // TODO does graphhopper map instructions onto line indices?
  66           }
  67
  68           callback(false, {
  69             line: line,
  70             steps: steps,
  71             distance: path.distance,
  72             time: path.time / 1000,
  73             ascend: path.ascend,
  74             descend: path.descend
  75           });
  76         },
  77         error: function () {
  78           callback(true);
  79         }
  80       });
  81     }
  82   };
  83 }
  84
  85 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_car", "car"), true);
  86 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_bicycle", "bike"), true);
  87 OSM.Directions.addEngine(new GraphHopperEngine("graphhopper_foot", "foot"), true);