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 url = document.location.protocol + "//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       return $.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             var name = s[1] ? "<b>" + s[1] + "</b>" : I18n.t('javascripts.directions.instructions.unnamed');
  68             if (instCodes[0] === "11" && instCodes[1]) {
  69               instText += I18n.t(TURN_INSTRUCTIONS[instCodes[0]] + '_with_exit', { exit: instCodes[1], name: name } );
  70             } else {
  71               instText += I18n.t(TURN_INSTRUCTIONS[instCodes[0]] + '_without_exit', { name: name });
  72             }
  73             if ((i + 1) < data.route_instructions.length) {
  74               linesegend = data.route_instructions[i + 1][3] + 1;
  75             } else {
  76               linesegend = s[3] + 1;
  77             }
  78             steps.push([line[s[3]], s[0].split('-')[0], instText, s[2], line.slice(s[3], linesegend)]);
  79           }
  80
  81           callback(null, {
  82             line: line,
  83             steps: steps,
  84             distance: data.route_summary.total_distance,
  85             time: data.route_summary.total_time
  86           });
  87         }
  88       });
  89     }
  90   };
  91 }
  92
  93 OSM.Directions.addEngine(new OSRMEngine(), true);