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         'javascripts.directions.instructions.continue',         // 1
  16         'javascripts.directions.instructions.slight_right',     // 2
  17         'javascripts.directions.instructions.turn_right',       // 3
  18         'javascripts.directions.instructions.sharp_right',      // 4
  19         'javascripts.directions.instructions.uturn',            // 5
  20         'javascripts.directions.instructions.sharp_left',       // 6
  21         'javascripts.directions.instructions.turn_left',        // 7
  22         'javascripts.directions.instructions.slight_left',      // 8
  23         'javascripts.directions.instructions.via_point',        // 9
  24         'javascripts.directions.instructions.follow',           // 10
  25         'javascripts.directions.instructions.roundabout',       // 11
  26         'javascripts.directions.instructions.leave_roundabout', // 12
  27         'javascripts.directions.instructions.stay_roundabout',  // 13
  28         'javascripts.directions.instructions.start',            // 14
  29         'javascripts.directions.instructions.destination',      // 15
  30         'javascripts.directions.instructions.against_oneway',   // 16
  31         'javascripts.directions.instructions.end_oneway',       // 17
  32         'javascripts.directions.instructions.ferry'             // 18
  33       ];
  34
  35       var params = [
  36         { name: "z", value: "14" },
  37         { name: "output", value: "json" },
  38         { name: "instructions", value: true }
  39       ];
  40
  41       for (var i = 0; i < points.length; i++) {
  42         params.push({ name: "loc", value: points[i].lat + "," + points[i].lng });
  43
  44         if (hintData && previousPoints && previousPoints[i].equals(points[i])) {
  45           params.push({ name: "hint", value: hintData.locations[i] });
  46         }
  47       }
  48
  49       if (hintData && hintData.checksum) {
  50         params.push({ name: "checksum", value: hintData.checksum });
  51       }
  52
  53       return $.ajax({
  54         url: document.location.protocol + "//router.project-osrm.org/viaroute",
  55         data: params,
  56         dataType: "json",
  57         success: function (data) {
  58           if (data.status === 207)
  59             return callback(true);
  60
  61           previousPoints = points;
  62           hintData = data.hint_data;
  63
  64           var line = L.PolylineUtil.decode(data.route_geometry, {
  65             precision: 6
  66           });
  67
  68           var steps = [];
  69           for (i = 0; i < data.route_instructions.length; i++) {
  70             var s = data.route_instructions[i];
  71             var linesegend;
  72             var instCodes = s[0].split('-');
  73             if (s[8] === 2) {
  74               /* indicates a ferry in car routing mode, see https://github.com/Project-OSRM/osrm-backend/blob/6cbbd1e5a1b441eb27055f56956e1bac14832a58/profiles/car.lua#L151 */
  75               instCodes = ["18"];
  76             }
  77             var instText = "<b>" + (i + 1) + ".</b> ";
  78             var name = s[1] ? "<b>" + s[1] + "</b>" : I18n.t('javascripts.directions.instructions.unnamed');
  79             if (instCodes[0] === "11" && instCodes[1]) {
  80               instText += I18n.t(TURN_INSTRUCTIONS[instCodes[0]] + '_with_exit', { exit: instCodes[1], name: name } );
  81             } else {
  82               instText += I18n.t(TURN_INSTRUCTIONS[instCodes[0]] + '_without_exit', { name: name });
  83             }
  84             if ((i + 1) < data.route_instructions.length) {
  85               linesegend = data.route_instructions[i + 1][3] + 1;
  86             } else {
  87               linesegend = s[3] + 1;
  88             }
  89             steps.push([line[s[3]], instCodes[0], instText, s[2], line.slice(s[3], linesegend)]);
  90           }
  91
  92           callback(false, {
  93             line: line,
  94             steps: steps,
  95             distance: data.route_summary.total_distance,
  96             time: data.route_summary.total_time
  97           });
  98         },
  99         error: function () {
 100           callback(true);
 101         }
 102       });
 103     }
 104   };
 105 }
 106
 107 OSM.Directions.addEngine(new OSRMEngine(), true);