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         *** URL history (or do we consciously not want to support that?)
  14 */
  15
  16 var TURN_INSTRUCTIONS=["",
  17         "Continue on ",                         // 1
  18         "Slight right onto ",           // 2
  19         "Turn right onto ",                     // 3
  20         "Sharp right onto ",            // 4
  21         "U-turn along ",                        // 5
  22         "Sharp left onto ",                     // 6
  23         "Turn left onto ",                      // 7
  24         "Slight left onto ",            // 8
  25         "(via point) ",                         // 9
  26         "Follow ",                                      // 10
  27         "At roundabout take ",          // 11
  28         "Leave roundabout - ",          // 12
  29         "Stay on roundabout - ",        // 13
  30         "Start at end of ",                     // 14
  31         "Reach destination",            // 15
  32         "Go against one-way on ",       // 16
  33         "End of one-way on "]           // 17
  34
  35 var ROUTING_POLYLINE={
  36         color: '#03f',
  37         opacity: 0.3,
  38         weight: 10
  39 };
  40
  41
  42 OSM.Routing=function(map,name,jqSearch) {
  43         var r={};
  44         r.map=map;                              // Leaflet map
  45         r.name=name;                    // global variable name of this instance (needed for JSONP)
  46         r.jqSearch=jqSearch;    // JQuery object for search panel
  47
  48         r.route_from=null;
  49         r.route_to=null;
  50         r.viaPoints=[];
  51         r.polyline=null;
  52
  53         // Geocoding
  54
  55         r.geocode=function(id,event) { var _this=this;
  56                 var field=event.target;
  57                 var v=event.target.value;
  58                 // *** do something if v==''
  59                 var querystring = '<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(v) + '&format=json';
  60                 // *** &accept-language=<%#= request.user_preferred_languages.join(',') %>
  61                 // *** prefer current viewport
  62                 $.getJSON(querystring, function(json) { _this._gotGeocode(json,field); });
  63         };
  64
  65         r._gotGeocode=function(json,field) {
  66                 if (json.length==0) {
  67                         alert("Sorry, couldn't find that place.");      // *** internationalise
  68                         r[field.id]=null;
  69                         return;
  70                 }
  71                 field.value=json[0].display_name;
  72                 var lat=Number(json[0].lat), lon=Number(json[0].lon);
  73                 r[field.id]=[lat,lon];
  74                 // ** update markers
  75         };
  76
  77         // Route-fetching UI
  78
  79         r.requestRoute=function() {
  80                 if (r.route_from && r.route_to) {
  81                         var chosen=jqSearch.find('select.routing_engines :selected').val();
  82                         r.engines[chosen].getRoute(true,[r.route_from,r.route_to]);
  83                         // then, when the route has been fetched, it'll call the engine's gotRoute function
  84                 }
  85         };
  86
  87         // Take an array of Leaflet LatLngs and draw it as a polyline
  88         r.setPolyline=function(line) {
  89                 if (r.polyline) map.removeLayer(r.polyline);
  90                 r.polyline=L.polyline(line, ROUTING_POLYLINE).addTo(r.map);
  91                 r.map.fitBounds(r.polyline.getBounds());
  92         };
  93
  94         // Take an array of directions and write it out
  95         // (we use OSRM's route_instructions format)
  96         // *** translations?
  97         r.setItinerary=function(steps) {
  98                 // Create base table
  99                 $("#content").removeClass("overlay-sidebar");
 100                 $('#sidebar_content').empty();
 101                 var html='<h2><a class="geolink" href="#" onclick="$(~.close_directions~).click();return false;"><span class="icon close"></span></a>Directions</h2>'.replace(/~/g,"'");
 102                 html+="<table id='turnbyturn' />";
 103                 $('#sidebar_content').html(html);
 104                 // Add each row
 105                 var cumulative=0;
 106                 for (var i=0; i<steps.length; i++) {
 107                         var step=steps[i];
 108                         var instCodes=step[0].split('-');
 109                         // Assemble instruction text
 110                         var instText="<b>"+(i+1)+".</b> ";
 111                         instText+=TURN_INSTRUCTIONS[instCodes[0]];
 112                         if (instCodes[1]) { instText+="exit "+instCodes[1]+" "; }
 113                         if (instCodes[0]!=15) { instText+=step[1] ? "<b>"+step[1]+"</b>" : "(unnamed)"; }
 114                         // Distance
 115                         var dist=step[2];
 116                         if (dist<5) { dist=""; }
 117                         else if (dist<200) { dist=Math.round(dist/10)*10+"m"; }
 118                         else if (dist<1500) { dist=Math.round(dist/100)*100+"m"; }
 119                         else if (dist<5000) { dist=Math.round(dist/100)/10+"km"; }
 120                         else { dist=Math.round(dist/1000)+"km"; }
 121                         // Add to table
 122                         var row=$("<tr class='turn'/>");
 123                         row.append("<td class='direction i"+instCodes[0]+"'> ");
 124                         row.append("<td class='instruction'>"+instText);
 125                         row.append("<td class='distance'>"+dist);
 126                         with ({num: i, dist: step[3]}) {
 127                                 row.on('click',function(e) {
 128                                         r.clickTurn(num, r.polyline.getLatLngs()[dist]);
 129                                 });
 130                         };
 131                         $('#turnbyturn').append(row);
 132                         cumulative+=step[2];
 133                 }
 134         };
 135         r.clickTurn=function(num,latlng) {
 136                 L.popup().setLatLng(latlng).setContent("<p>"+(num+1)+"</p>").openOn(r.map);
 137         };
 138
 139
 140         // Close all routing UI
 141
 142         r.close=function() {
 143                 $("#content").addClass("overlay-sidebar");
 144                 if (r.polyline) map.removeLayer(r.polyline);
 145         };
 146
 147         // Add engines
 148
 149         r.engines=[];
 150         r.addEngine=function(engine) {
 151                 // Save engine
 152                 var i=r.engines.length;
 153                 engine.subscript=i;
 154                 r['engine'+i]=engine;
 155                 r.engines.push(engine);
 156
 157                 // Add generic JSONP function
 158                 engine.requestJSONP=function(url) {
 159                         var script = document.createElement('script');
 160                         script.src = url+"&jsonp="+r.name+".engine"+this.subscript+".gotRoute";
 161                         // OSRM doesn't like non-alphanumeric, otherwise we could just do OSM.routing.engines["+engine.subscript+"].gotRoute
 162                         document.body.appendChild(script);
 163                 };
 164
 165                 // Populate dropdown
 166                 var select=jqSearch.find('select.routing_engines');
 167                 select.append("<option value='"+i+"'>"+engine.name+"</option>");
 168         };
 169
 170         // OSRM car engine
 171         // *** this should all be shared from an OSRM library somewhere
 172         // *** need to clear hints at some point
 173
 174         r.addEngine({
 175                 name: 'Car (OSRM)',
 176                 draggable: true,
 177                 _hints: {},
 178                 getRoute: function(final,points) {
 179                         var url="http://router.project-osrm.org/viaroute?z=14&output=json";
 180                         for (var i=0; i<points.length; i++) {
 181                                 var pair=points[i].join(',');
 182                                 url+="&loc="+pair;
 183                                 if (this._hints[pair]) url+= "&hint="+this._hints[pair];
 184                         }
 185                         if (final) url+="&instructions=true";
 186                         this.requestJSONP(url);
 187                 },
 188                 gotRoute: function(data) {
 189                         if (data.status==207) {
 190                                 alert("Couldn't find route between those two places");
 191                                 return false;
 192                         }
 193                         // *** store hints
 194                         var line=L.PolylineUtil.decode(data.route_geometry);
 195                         for (i=0; i<line.length; i++) { line[i].lat/=10; line[i].lng/=10; }
 196                         r.setPolyline(line);
 197                         r.setItinerary(data.route_instructions);
 198                 }
 199         });
 200
 201         return r;
 202 };