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

   1 // OSRM engine
   2 // Doesn't yet support hints
   3
   4 function OSRMEngine(id, vehicleType) {
   5   var cachedHints = [];
   6
   7   return {
   8     id: id,
   9     creditline: "<a href=\"https://routing.openstreetmap.de/about.html\" target=\"_blank\">OSRM (FOSSGIS)</a>",
  10     draggable: true,
  11
  12     _transformSteps: function (input_steps, line) {
  13       var INSTRUCTION_TEMPLATE = {
  14         "continue": "javascripts.directions.instructions.continue",
  15         "merge right": "javascripts.directions.instructions.merge_right",
  16         "merge left": "javascripts.directions.instructions.merge_left",
  17         "off ramp right": "javascripts.directions.instructions.offramp_right",
  18         "off ramp left": "javascripts.directions.instructions.offramp_left",
  19         "on ramp right": "javascripts.directions.instructions.onramp_right",
  20         "on ramp left": "javascripts.directions.instructions.onramp_left",
  21         "fork right": "javascripts.directions.instructions.fork_right",
  22         "fork left": "javascripts.directions.instructions.fork_left",
  23         "end of road right": "javascripts.directions.instructions.endofroad_right",
  24         "end of road left": "javascripts.directions.instructions.endofroad_left",
  25         "turn straight": "javascripts.directions.instructions.continue",
  26         "turn slight right": "javascripts.directions.instructions.slight_right",
  27         "turn right": "javascripts.directions.instructions.turn_right",
  28         "turn sharp right": "javascripts.directions.instructions.sharp_right",
  29         "turn uturn": "javascripts.directions.instructions.uturn",
  30         "turn sharp left": "javascripts.directions.instructions.sharp_left",
  31         "turn left": "javascripts.directions.instructions.turn_left",
  32         "turn slight left": "javascripts.directions.instructions.slight_left",
  33         "roundabout": "javascripts.directions.instructions.roundabout",
  34         "rotary": "javascripts.directions.instructions.roundabout",
  35         "exit roundabout": "javascripts.directions.instructions.exit_roundabout",
  36         "exit rotary": "javascripts.directions.instructions.exit_roundabout",
  37         "depart": "javascripts.directions.instructions.start",
  38         "arrive": "javascripts.directions.instructions.destination"
  39       };
  40       var ICON_MAP = {
  41         "continue": 0,
  42         "merge right": 21,
  43         "merge left": 20,
  44         "off ramp right": 24,
  45         "off ramp left": 25,
  46         "on ramp right": 2,
  47         "on ramp left": 6,
  48         "fork right": 18,
  49         "fork left": 19,
  50         "end of road right": 22,
  51         "end of road left": 23,
  52         "turn straight": 0,
  53         "turn slight right": 1,
  54         "turn right": 2,
  55         "turn sharp right": 3,
  56         "turn uturn": 4,
  57         "turn slight left": 5,
  58         "turn left": 6,
  59         "turn sharp left": 7,
  60         "roundabout": 10,
  61         "rotary": 10,
  62         "exit roundabout": 10,
  63         "exit rotary": 10,
  64         "depart": 8,
  65         "arrive": 14
  66       };
  67       var numToWord = function (num) {
  68         return ["first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth"][num - 1];
  69       };
  70       var transformed_steps = input_steps.map(function (step, idx) {
  71         var maneuver_id;
  72
  73         // special case handling
  74         switch (step.maneuver.type) {
  75           case "on ramp":
  76           case "off ramp":
  77           case "merge":
  78           case "end of road":
  79           case "fork":
  80             maneuver_id = step.maneuver.type + " " + (step.maneuver.modifier.indexOf("left") >= 0 ? "left" : "right");
  81             break;
  82           case "depart":
  83           case "arrive":
  84           case "roundabout":
  85           case "rotary":
  86           case "exit roundabout":
  87           case "exit rotary":
  88             maneuver_id = step.maneuver.type;
  89             break;
  90           case "roundabout turn":
  91           case "turn":
  92             maneuver_id = "turn " + step.maneuver.modifier;
  93             break;
  94           // for unknown types the fallback is turn
  95           default:
  96             maneuver_id = "turn " + step.maneuver.modifier;
  97             break;
  98         }
  99         var template = INSTRUCTION_TEMPLATE[maneuver_id];
 100
 101         // convert lat,lng pairs to LatLng objects
 102         var step_geometry = L.PolylineUtil.decode(step.geometry, { precision: 5 }).map(function (a) { return L.latLng(a); });
 103         // append step_geometry on line
 104         Array.prototype.push.apply(line, step_geometry);
 105
 106         var instText = "<b>" + (idx + 1) + ".</b> ";
 107         var destinations = "<b>" + step.destinations + "</b>";
 108         var namedRoad = true;
 109         var name;
 110
 111         if (step.name && step.ref) {
 112           name = "<b>" + step.name + " (" + step.ref + ")</b>";
 113         } else if (step.name) {
 114           name = "<b>" + step.name + "</b>";
 115         } else if (step.ref) {
 116           name = "<b>" + step.ref + "</b>";
 117         } else {
 118           name = I18n.t("javascripts.directions.instructions.unnamed");
 119           namedRoad = false;
 120         }
 121
 122         if (step.maneuver.type.match(/^exit (rotary|roundabout)$/)) {
 123           instText += I18n.t(template, { name: name });
 124         } else if (step.maneuver.type.match(/^(rotary|roundabout)$/)) {
 125           if (step.maneuver.exit) {
 126             if (step.maneuver.exit <= 10) {
 127               instText += I18n.t(template + "_with_exit_ordinal", { exit: I18n.t("javascripts.directions.instructions.exit_counts." + numToWord(step.maneuver.exit)), name: name });
 128             } else {
 129               instText += I18n.t(template + "_with_exit", { exit: step.maneuver.exit, name: name });
 130             }
 131           } else {
 132             instText += I18n.t(template + "_without_exit", { name: name });
 133           }
 134         } else if (step.maneuver.type.match(/^(on ramp|off ramp)$/)) {
 135           var params = {};
 136           if (step.exits && step.maneuver.type.match(/^(off ramp)$/)) params.exit = step.exits;
 137           if (step.destinations) params.directions = destinations;
 138           if (namedRoad) params.directions = name;
 139           if (Object.keys(params).length > 0) {
 140             template = template + "_with_" + Object.keys(params).join("_");
 141           }
 142           instText += I18n.t(template, params);
 143         } else {
 144           instText += I18n.t(template + "_without_exit", { name: name });
 145         }
 146         return [[step.maneuver.location[1], step.maneuver.location[0]], ICON_MAP[maneuver_id], instText, step.distance, step_geometry];
 147       });
 148
 149       return transformed_steps;
 150     },
 151
 152     getRoute: function (points, callback) {
 153       var params = [
 154         { name: "overview", value: "false" },
 155         { name: "geometries", value: "polyline" },
 156         { name: "steps", value: true }
 157       ];
 158
 159
 160       if (cachedHints.length === points.length) {
 161         params.push({ name: "hints", value: cachedHints.join(";") });
 162       } else {
 163         // invalidate cache
 164         cachedHints = [];
 165       }
 166
 167       var encoded_coords = points.map(function (p) {
 168         return p.lng + "," + p.lat;
 169       }).join(";");
 170
 171       var req_url = OSM.FOSSGIS_OSRM_URL + "routed-" + vehicleType + "/route/v1/driving/" + encoded_coords;
 172
 173       var onResponse = function (data) {
 174         if (data.code !== "Ok") {
 175           return callback(true);
 176         }
 177
 178         cachedHints = data.waypoints.map(function (wp) {
 179           return wp.hint;
 180         });
 181
 182         var line = [];
 183         var transformLeg = function (leg) {
 184           return this._transformSteps(leg.steps, line);
 185         };
 186
 187         var steps = [].concat.apply([], data.routes[0].legs.map(transformLeg.bind(this)));
 188
 189         callback(false, {
 190           line: line,
 191           steps: steps,
 192           distance: data.routes[0].distance,
 193           time: data.routes[0].duration
 194         });
 195       };
 196
 197       return $.ajax({
 198         url: req_url,
 199         data: params,
 200         dataType: "json",
 201         success: onResponse.bind(this),
 202         error: function () {
 203           callback(true);
 204         }
 205       });
 206     }
 207   };
 208 }
 209
 210 OSM.Directions.addEngine(new OSRMEngine("fossgis_osrm_car", "car"), true);
 211 OSM.Directions.addEngine(new OSRMEngine("fossgis_osrm_bike", "bike"), true);
 212 OSM.Directions.addEngine(new OSRMEngine("fossgis_osrm_foot", "foot"), true);