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

   1 // OSRM car engine
   2 // Doesn't yet support hints
   3
   4 function OSRMEngine() {
   5   var previousPoints, hintData;
   6
   7   return {
   8     id: "osrm_car",
   9     creditline: '<a href="http://project-osrm.org/" target="_blank">OSRM</a>',
  10     draggable: true,
  11
  12     getRoute: function (points, callback) {
  13       var TURN_INSTRUCTIONS = [
  14         "",
  15         I18n.t('javascripts.directions.instructions.continue_on'),      // 1
  16         I18n.t('javascripts.directions.instructions.slight_right'),     // 2
  17         I18n.t('javascripts.directions.instructions.turn_right'),       // 3
  18         I18n.t('javascripts.directions.instructions.sharp_right'),      // 4
  19         I18n.t('javascripts.directions.instructions.uturn'),            // 5
  20         I18n.t('javascripts.directions.instructions.sharp_left'),       // 6
  21         I18n.t('javascripts.directions.instructions.turn_left'),        // 7
  22         I18n.t('javascripts.directions.instructions.slight_left'),      // 8
  23         I18n.t('javascripts.directions.instructions.via_point'),        // 9
  24         I18n.t('javascripts.directions.instructions.follow'),           // 10
  25         I18n.t('javascripts.directions.instructions.roundabout'),       // 11
  26         I18n.t('javascripts.directions.instructions.leave_roundabout'), // 12
  27         I18n.t('javascripts.directions.instructions.stay_roundabout'),  // 13
  28         I18n.t('javascripts.directions.instructions.start'),            // 14
  29         I18n.t('javascripts.directions.instructions.destination'),      // 15
  30         I18n.t('javascripts.directions.instructions.against_oneway'),   // 16
  31         I18n.t('javascripts.directions.instructions.end_oneway')        // 17
  32       ];
  33
  34       var url = "http://router.project-osrm.org/viaroute?z=14&output=json&instructions=true";
  35
  36       for (var i = 0; i < points.length; i++) {
  37         url += "&loc=" + points[i].lat + ',' + points[i].lng;
  38         if (hintData && previousPoints && previousPoints[i].equals(points[i])) {
  39           url += "&hint=" + hintData.locations[i];
  40         }
  41       }
  42
  43       if (hintData && hintData.checksum) {
  44         url += "&checksum=" + hintData.checksum;
  45       }
  46
  47       $.ajax({
  48         url: url,
  49         dataType: 'json',
  50         success: function (data) {
  51           if (data.status == 207)
  52             return callback(true);
  53
  54           previousPoints = points;
  55           hintData = data.hint_data;
  56
  57           var line = L.PolylineUtil.decode(data.route_geometry, {
  58             precision: 6
  59           });
  60
  61           var steps = [];
  62           for (i = 0; i < data.route_instructions.length; i++) {
  63             var s = data.route_instructions[i];
  64             var linesegend;
  65             var instCodes = s[0].split('-');
  66             var instText = "<b>" + (i + 1) + ".</b> ";
  67             instText += TURN_INSTRUCTIONS[instCodes[0]];
  68             if (instCodes[1]) {
  69               instText += "exit " + instCodes[1] + " ";
  70             }
  71             if (instCodes[0] != 15) {
  72               instText += s[1] ? "<b>" + s[1] + "</b>" : I18n.t('javascripts.directions.instructions.unnamed');
  73             }
  74             if ((i + 1) < data.route_instructions.length) {
  75               linesegend = data.route_instructions[i + 1][3] + 1;
  76             } else {
  77               linesegend = s[3] + 1;
  78             }
  79             steps.push([line[s[3]], s[0].split('-')[0], instText, s[2], line.slice(s[3], linesegend)]);
  80           }
  81
  82           callback(null, {
  83             line: line,
  84             steps: steps,
  85             distance: data.route_summary.total_distance,
  86             time: data.route_summary.total_time
  87           });
  88         }
  89       });
  90     }
  91   };
  92 }
  93
  94 OSM.Directions.addEngine(OSRMEngine(), true);