829eb54a080c45eb5603ef9a36429f16d602702a
[rails.git] / 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);