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       ];
  33
  34       var params = [
  35         { name: "z", value: "14" },
  36         { name: "output", value: "json" },
  37         { name: "instructions", value: true }
  38       ];
  39
  40       for (var i = 0; i < points.length; i++) {
  41         params.push({ name: "loc", value: points[i].lat + "," + points[i].lng });
  42
  43         if (hintData && previousPoints && previousPoints[i].equals(points[i])) {
  44           params.push({ name: "hint", value: hintData.locations[i] });
  45         }
  46       }
  47
  48       if (hintData && hintData.checksum) {
  49         params.push({ name: "checksum", value: hintData.checksum });
  50       }
  51
  52       return $.ajax({
  53         url: document.location.protocol + "//router.project-osrm.org/viaroute",
  54         data: params,
  55         dataType: "json",
  56         success: function (data) {
  57           if (data.status === 207)
  58             return callback(true);
  59
  60           previousPoints = points;
  61           hintData = data.hint_data;
  62
  63           var line = L.PolylineUtil.decode(data.route_geometry, {
  64             precision: 6
  65           });
  66
  67           var steps = [];
  68           for (i = 0; i < data.route_instructions.length; i++) {
  69             var s = data.route_instructions[i];
  70             var linesegend;
  71             var instCodes = s[0].split('-');
  72             var instText = "<b>" + (i + 1) + ".</b> ";
  73             var name = s[1] ? "<b>" + s[1] + "</b>" : I18n.t('javascripts.directions.instructions.unnamed');
  74             if (instCodes[0] === "11" && instCodes[1]) {
  75               instText += I18n.t(TURN_INSTRUCTIONS[instCodes[0]] + '_with_exit', { exit: instCodes[1], name: name } );
  76             } else {
  77               instText += I18n.t(TURN_INSTRUCTIONS[instCodes[0]] + '_without_exit', { name: name });
  78             }
  79             if ((i + 1) < data.route_instructions.length) {
  80               linesegend = data.route_instructions[i + 1][3] + 1;
  81             } else {
  82               linesegend = s[3] + 1;
  83             }
  84             steps.push([line[s[3]], s[0].split('-')[0], instText, s[2], line.slice(s[3], linesegend)]);
  85           }
  86
  87           callback(false, {
  88             line: line,
  89             steps: steps,
  90             distance: data.route_summary.total_distance,
  91             time: data.route_summary.total_time
  92           });
  93         },
  94         error: function () {
  95           callback(true);
  96         }
  97       });
  98     }
  99   };
 100 }
 101
 102 OSM.Directions.addEngine(new OSRMEngine(), true);