app/assets/javascripts/routing.js.erb

   1 /*
   2         osm.org routing interface
   3
   4         See also:
   5         https://github.com/apmon/openstreetmap-website/tree/routing2
   6         https://github.com/apmon/openstreetmap-website/compare/routing2
   7         https://github.com/apmon/openstreetmap-website/blob/9755c3ae0a8d0684d43760f91dc864ff42d8477a/app/views/routing/start.js.erb
   8
   9         *** draggable start/end markers
  10         *** click each part
  11         *** translation (including all alerts and presentation)
  12         *** export GPX
  13 */
  14
  15 var TURN_INSTRUCTIONS=["",
  16         "Continue on ",                         // 1
  17         "Slight right onto ",           // 2
  18         "Turn right onto ",                     // 3
  19         "Sharp right onto ",            // 4
  20         "U-turn along ",                        // 5
  21         "Sharp left onto ",                     // 6
  22         "Turn left onto ",                      // 7
  23         "Slight left onto ",            // 8
  24         "(via point) ",                         // 9
  25         "Follow ",                                      // 10
  26         "At roundabout take ",          // 11
  27         "Leave roundabout - ",          // 12
  28         "Stay on roundabout - ",        // 13
  29         "Start at end of ",                     // 14
  30         "Reach destination",            // 15
  31         "Go against one-way on ",       // 16
  32         "End of one-way on "]           // 17
  33
  34 var ROUTING_POLYLINE={
  35         color: '#03f',
  36         opacity: 0.3,
  37         weight: 10
  38 };
  39
  40
  41 OSM.Routing=function(map,name,jqSearch) {
  42         var r={};
  43         r.map=map;                              // Leaflet map
  44         r.name=name;                    // global variable name of this instance (needed for JSONP)
  45         r.jqSearch=jqSearch;    // JQuery object for search panel
  46
  47         r.route_from=null;
  48         r.route_to=null;
  49         r.viaPoints=[];
  50         r.polyline=null;
  51
  52         // Geocoding
  53
  54         r.geocode=function(id,event) { var _this=this;
  55                 var field=event.target;
  56                 var v=event.target.value;
  57                 // *** do something if v==''
  58                 var querystring = '<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(v) + '&format=json';
  59                 // *** &accept-language=<%#= request.user_preferred_languages.join(',') %>
  60                 // *** prefer current viewport
  61                 $.getJSON(querystring, function(json) { _this._gotGeocode(json,field); });
  62         };
  63
  64         r._gotGeocode=function(json,field) {
  65                 if (json.length==0) {
  66                         alert("Sorry, couldn't find that place.");      // *** internationalise
  67                         r[field.id]=null;
  68                         return;
  69                 }
  70                 field.value=json[0].display_name;
  71                 var lat=Number(json[0].lat), lon=Number(json[0].lon);
  72                 r[field.id]=[lat,lon];
  73                 // ** update markers
  74         };
  75
  76         // Route-fetching UI
  77
  78         r.requestRoute=function() {
  79                 if (r.route_from && r.route_to) {
  80                         var chosen=jqSearch.find('select.routing_engines :selected').val();
  81                         r.engines[chosen].getRoute(true,[r.route_from,r.route_to]);
  82                         // then, when the route has been fetched, it'll call the engine's gotRoute function
  83                 }
  84         };
  85
  86         // Take an array of Leaflet LatLngs and draw it as a polyline
  87         r.setPolyline=function(line) {
  88                 if (r.polyline) map.removeLayer(r.polyline);
  89                 r.polyline=L.polyline(line, ROUTING_POLYLINE).addTo(r.map);
  90                 r.map.fitBounds(r.polyline.getBounds());
  91         };
  92
  93         // Take an array of directions and write it out
  94         // (we use OSRM's route_instructions format)
  95         // *** translations?
  96         r.setItinerary=function(steps) {
  97                 $("#content").removeClass("overlay-sidebar");
  98                 $('#sidebar_content').empty();
  99                 var html='<h2><a class="geolink" href="#"><span class="icon close"></span></a>Directions</h2>';
 100                 html+="<table>";
 101                 for (var i=0; i<steps.length; i++) {
 102                         var step=steps[i];
 103                         var instCodes=step[0].split('-');
 104                         // Assemble instruction text
 105                         var instText="<b>"+(i+1)+".</b> ";
 106                         instText+=TURN_INSTRUCTIONS[instCodes[0]];
 107                         if (instCodes[1]) { instText+="exit "+instCodes[1]+" "; }
 108                         if (instCodes[0]!=15) { instText+=step[1] ? "<b>"+step[1]+"</b>" : "(unnamed)"; }
 109                         // Add to table
 110                         html+="<tr>";
 111                         html+="<td class='direction i"+instCodes[0]+"'> ";
 112                         html+="<td>"+instText;
 113                 }
 114                 html+="</table>";
 115         $('#sidebar_content').html(html);
 116         };
 117
 118
 119         // Add engines
 120
 121         r.engines=[];
 122         r.addEngine=function(engine) {
 123                 // Save engine
 124                 var i=r.engines.length;
 125                 engine.subscript=i;
 126                 r['engine'+i]=engine;
 127                 r.engines.push(engine);
 128
 129                 // Add generic JSONP function
 130                 engine.requestJSONP=function(url) {
 131                         var script = document.createElement('script');
 132                         script.src = url+"&jsonp="+r.name+".engine"+this.subscript+".gotRoute";
 133                         // OSRM doesn't like non-alphanumeric, otherwise we could just do OSM.routing.engines["+engine.subscript+"].gotRoute
 134                         document.body.appendChild(script);
 135                 };
 136
 137                 // Populate dropdown
 138                 var select=jqSearch.find('select.routing_engines');
 139                 select.append("<option value='"+i+"'>"+engine.name+"</option>");
 140         };
 141
 142         // OSRM car engine
 143         // *** this should all be shared from an OSRM library somewhere
 144         // *** need to clear hints at some point
 145
 146         r.addEngine({
 147                 name: 'Car (OSRM)',
 148                 draggable: true,
 149                 _hints: {},
 150                 getRoute: function(final,points) {
 151                         var url="http://router.project-osrm.org/viaroute?z=14&output=json";
 152                         for (var i=0; i<points.length; i++) {
 153                                 var pair=points[i].join(',');
 154                                 url+="&loc="+pair;
 155                                 if (this._hints[pair]) url+= "&hint="+this._hints[pair];
 156                         }
 157                         if (final) url+="&instructions=true";
 158                         this.requestJSONP(url);
 159                 },
 160                 gotRoute: function(data) {
 161                         if (data.status==207) {
 162                                 alert("Couldn't find route between those two places");
 163                                 return false;
 164                         }
 165                         // *** store hints
 166                         var line=L.PolylineUtil.decode(data.route_geometry);
 167                         for (i=0; i<line.length; i++) { line[i].lat/=10; line[i].lng/=10; }
 168                         r.setPolyline(line);
 169                         r.setItinerary(data.route_instructions);
 170                 }
 171         });
 172
 173         return r;
 174 };