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         *** translation (including all alerts and presentation)
  11         *** export GPX
  12         *** URL history (or do we consciously not want to support that?)
  13         *** spinner when waiting for result (beneath 'Go' button?)
  14
  15         *** add YOURS engine
  16         *** add GraphHopper engine
  17 */
  18
  19 var TURN_INSTRUCTIONS=["",
  20         "Continue on ",                         // 1
  21         "Slight right onto ",           // 2
  22         "Turn right onto ",                     // 3
  23         "Sharp right onto ",            // 4
  24         "U-turn along ",                        // 5
  25         "Sharp left onto ",                     // 6
  26         "Turn left onto ",                      // 7
  27         "Slight left onto ",            // 8
  28         "(via point) ",                         // 9
  29         "Follow ",                                      // 10
  30         "At roundabout take ",          // 11
  31         "Leave roundabout - ",          // 12
  32         "Stay on roundabout - ",        // 13
  33         "Start at end of ",                     // 14
  34         "Reach destination",            // 15
  35         "Go against one-way on ",       // 16
  36         "End of one-way on "]           // 17
  37
  38 var ROUTING_POLYLINE={
  39         color: '#03f',
  40         opacity: 0.3,
  41         weight: 10
  42 };
  43
  44
  45 OSM.RoutingEngines={
  46         list: []
  47         // common functions and constants, e.g. OSRM parser, can go here
  48 };
  49
  50 OSM.Routing=function(map,name,jqSearch) {
  51         var r={};
  52
  53         r.map=map;                              // Leaflet map
  54         r.name=name;                    // global variable name of this instance (needed for JSONP)
  55         r.jqSearch=jqSearch;    // JQuery object for search panel
  56
  57         r.route_from=null;              // null=unset, false=awaiting response, [lat,lon]=geocoded
  58         r.route_to=null;                //  |
  59         r.awaitingGeocode=false;// true if the user has requested a route, but we're waiting on a geocode result
  60         r.awaitingRoute=false;  // true if we've asked the engine for a route and are waiting to hear back
  61         r.viaPoints=[];                 // not yet used
  62
  63         r.polyline=null;                // Leaflet polyline object
  64         r.popup=null;                   // Leaflet popup object
  65         r.marker_from=null;             // Leaflet from marker
  66         r.marker_to=null;               // Leaflet to marker
  67
  68         r.chosenEngine=null;    // currently selected routing engine
  69
  70         var icon_from = L.icon({
  71                 iconUrl: <%= asset_path('marker-green.png').to_json %>,
  72                 iconSize: [25, 41],
  73                 iconAnchor: [12, 41],
  74                 popupAnchor: [1, -34],
  75                 shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
  76                 shadowSize: [41, 41]
  77         });
  78         var icon_to = L.icon({
  79                 iconUrl: <%= asset_path('marker-red.png').to_json %>,
  80                 iconSize: [25, 41],
  81                 iconAnchor: [12, 41],
  82                 popupAnchor: [1, -34],
  83                 shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
  84                 shadowSize: [41, 41]
  85         });
  86
  87         // Geocoding
  88
  89         r.geocode=function(id,event) { var _this=this;
  90                 var field=event.target;
  91                 var v=event.target.value;
  92                 // *** do something if v==''
  93                 var querystring = '<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(v) + '&format=json';
  94                 // *** &accept-language=<%#= request.user_preferred_languages.join(',') %>
  95                 // *** prefer current viewport
  96                 r[field.id]=false;
  97                 $.getJSON(querystring, function(json) { _this._gotGeocode(json,field); });
  98         };
  99
 100         r._gotGeocode=function(json,field) {
 101                 if (json.length==0) {
 102                         alert("Sorry, couldn't find that place.");      // *** internationalise
 103                         r[field.id]=null;
 104                         return;
 105                 }
 106                 field.value=json[0].display_name;
 107                 var lat=Number(json[0].lat), lon=Number(json[0].lon);
 108                 r[field.id]=[lat,lon];
 109                 r.updateMarker(field.id);
 110                 if (r.awaitingGeocode) {
 111                         r.awaitingGeocode=false;
 112                         r.requestRoute(true);
 113                 }
 114         };
 115
 116         // Drag and drop markers
 117
 118         r.handleDrop=function(e) {
 119                 var id=e.originalEvent.dataTransfer.getData('id');
 120                 var ll=r.map.mouseEventToLatLng(e.originalEvent);
 121                 // *** ^^^ this is slightly off - we need to work out the latLng of the tip
 122                 r.createMarker(ll,id);
 123                 r.setNumericInput(ll,id);
 124                 r.requestRoute(true);
 125                 // update to/from field
 126         };
 127         r.createMarker=function(latlng,id) {
 128                 if (r[id]) r.map.removeLayer(r[id]);
 129                 r[id]=L.marker(latlng, {
 130                         icon: id=='marker_from' ? icon_from : icon_to,
 131                         draggable: true,
 132                         name: id
 133                 }).addTo(r.map);
 134                 r[id].on('drag',r.markerDragged);
 135                 r[id].on('dragend',r.markerDragged);
 136         };
 137         // Update marker from geocoded route input
 138         r.updateMarker=function(id) {
 139                 var m=id.replace('route','marker');
 140                 if (!r[m]) { r.createMarker(r[id],m); return; }
 141                 var ll=r[m].getLatLng();
 142                 if (ll.lat!=r[id][0] || ll.lng!=r[id][1]) {
 143                         r.createMarker(r[id],m);
 144                 }
 145         };
 146         // Marker has been dragged
 147         r.markerDragged=function(e) {
 148                 if (e.type=='drag' && !r.chosenEngine.draggable) return;
 149                 if (e.type=='drag' && r.awaitingRoute) return;
 150                 r.setNumericInput(e.target.getLatLng(), e.target.options.name);
 151                 r.requestRoute(e.type=='dragend');
 152         };
 153         // Set a route input field to a numeric value
 154         r.setNumericInput=function(ll,id) {
 155                 var routeid=id.replace('marker','route');
 156                 r[routeid]=[ll.lat,ll.lng];
 157                 $("[name="+routeid+"]:visible").val(Math.round(ll.lat*10000)/10000+" "+Math.round(ll.lng*10000)/10000);
 158         }
 159
 160         // Route-fetching UI
 161
 162         r.requestRoute=function(final) {
 163                 if (r.route_from && r.route_to) {
 164                         r.awaitingRoute=true;
 165                         r.chosenEngine.getRoute(final,[r.route_from,r.route_to]);
 166                         // then, when the route has been fetched, it'll call the engine's gotRoute function
 167                 } else if (r.route_from==false || r.route_to==false) {
 168                         // we're waiting for a Nominatim response before we can request a route
 169                         r.awaitingGeocode=true;
 170                 }
 171         };
 172
 173         // Take an array of Leaflet LatLngs and draw it as a polyline
 174         r.setPolyline=function(line) {
 175                 if (r.polyline) map.removeLayer(r.polyline);
 176                 r.polyline=L.polyline(line, ROUTING_POLYLINE).addTo(r.map);
 177                 // r.map.fitBounds(r.polyline.getBounds());
 178                 // *** ^^^ we only want to do this for geocode-originated routes
 179         };
 180
 181         // Take directions and write them out
 182         // data = { steps: array of [latlng, sprite number, instruction text, distance in metres] }
 183         // sprite numbers equate to OSRM's route_instructions turn values
 184         // *** translations?
 185         r.setItinerary=function(data) {
 186                 // Create base table
 187                 $("#content").removeClass("overlay-sidebar");
 188                 $('#sidebar_content').empty();
 189                 var html='<h2><a class="geolink" href="#" onclick="$(~.close_directions~).click();return false;"><span class="icon close"></span></a>Directions</h2>'.replace(/~/g,"'");
 190                 html+="<table id='turnbyturn' />";
 191                 $('#sidebar_content').html(html);
 192                 // Add each row
 193                 var cumulative=0;
 194                 for (var i=0; i<data.steps.length; i++) {
 195                         var step=data.steps[i];
 196                         // Distance
 197                         var dist=step[3];
 198                         if (dist<5) { dist=""; }
 199                         else if (dist<200) { dist=Math.round(dist/10)*10+"m"; }
 200                         else if (dist<1500) { dist=Math.round(dist/100)*100+"m"; }
 201                         else if (dist<5000) { dist=Math.round(dist/100)/10+"km"; }
 202                         else { dist=Math.round(dist/1000)+"km"; }
 203                         // Add to table
 204                         var row=$("<tr class='turn'/>");
 205                         row.append("<td class='direction i"+step[1]+"'> ");
 206                         row.append("<td class='instruction'>"+step[2]);
 207                         row.append("<td class='distance'>"+dist);
 208                         with ({ num: i, ll: step[0] }) {
 209                                 row.on('click',function(e) { r.clickTurn(num, ll); });
 210                         };
 211                         $('#turnbyturn').append(row);
 212                         cumulative+=step[3];
 213                 }
 214         };
 215         r.clickTurn=function(num,latlng) {
 216                 r.popup=L.popup().setLatLng(latlng).setContent("<p>"+(num+1)+"</p>").openOn(r.map);
 217         };
 218
 219         // Close all routing UI
 220
 221         r.close=function() {
 222                 $("#content").addClass("overlay-sidebar");
 223                 var remove=[r.polyline,r.popup,r.marker_from,r.marker_to];
 224                 for (var i=0; i<remove.length; i++) {
 225                         if (remove[i]) map.removeLayer(remove[i]);
 226                 }
 227         };
 228
 229         // Routing engine handling
 230
 231         // Add all engines
 232         var list=OSM.RoutingEngines.list;
 233         list.sort(function(a,b) { return a.name>b.name; });
 234         var select=r.jqSearch.find('select.routing_engines');
 235         for (var i=0; i<list.length; i++) {
 236                 // Set up JSONP callback
 237                 with ({num: i}) {
 238                         list[num].requestJSONP=function(url) {
 239                                 var script = document.createElement('script');
 240                                 script.src = url+r.name+".gotRoute"+num;
 241                                 document.body.appendChild(script);
 242                         };
 243                         r['gotRoute'+num]=function(data) { r.awaitingRoute=false; list[num].gotRoute(r,data); };
 244                 }
 245                 select.append("<option value='"+i+"'>"+list[i].name+"</option>");
 246         }
 247         r.engines=list;
 248         r.chosenEngine=list[0]; // default to first engine
 249
 250         // Choose an engine on dropdown change
 251         r.selectEngine=function(e) {
 252                 r.chosenEngine=r.engines[e.target.selectedIndex];
 253         };
 254         // Choose an engine by name
 255         r.chooseEngine=function(name) {
 256                 for (var i=0; i<r.engines.length; i++) {
 257                         if (r.engines[i].name==name) {
 258                                 r.chosenEngine=r.engines[i];
 259                                 r.jqSearch.find('select.routing_engines').val(i);
 260                         }
 261                 }
 262         };
 263
 264         return r;
 265 };