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
  14         *** add YOURS engine
  15         *** add GraphHopper engine
  16 */
  17
  18 var TURN_INSTRUCTIONS=["",
  19         "Continue on ",                         // 1
  20         "Slight right onto ",           // 2
  21         "Turn right onto ",                     // 3
  22         "Sharp right onto ",            // 4
  23         "U-turn along ",                        // 5
  24         "Sharp left onto ",                     // 6
  25         "Turn left onto ",                      // 7
  26         "Slight left onto ",            // 8
  27         "(via point) ",                         // 9
  28         "Follow ",                                      // 10
  29         "At roundabout take ",          // 11
  30         "Leave roundabout - ",          // 12
  31         "Stay on roundabout - ",        // 13
  32         "Start at end of ",                     // 14
  33         "Reach destination",            // 15
  34         "Go against one-way on ",       // 16
  35         "End of one-way on "]           // 17
  36
  37 var ROUTING_POLYLINE={
  38         color: '#03f',
  39         opacity: 0.3,
  40         weight: 10
  41 };
  42
  43
  44 OSM.RoutingEngines={
  45         list: []
  46         // common functions and constants, e.g. OSRM parser, can go here
  47 };
  48
  49 OSM.Routing=function(map,name,jqSearch) {
  50         var r={};
  51
  52         r.map=map;                              // Leaflet map
  53         r.name=name;                    // global variable name of this instance (needed for JSONP)
  54         r.jqSearch=jqSearch;    // JQuery object for search panel
  55
  56         r.route_from=null;              // null=unset, false=awaiting response, [lat,lon]=geocoded
  57         r.route_to=null;                //  |
  58         r.awaitingGeocode=false;// true if the user has requested a route, but we're waiting on a geocode result
  59         r.viaPoints=[];                 // not yet used
  60         r.polyline=null;                // Leaflet polyline object
  61         r.chosenEngine=null;    // currently selected routing engine
  62
  63         // Geocoding
  64
  65         r.geocode=function(id,event) { var _this=this;
  66                 var field=event.target;
  67                 var v=event.target.value;
  68                 // *** do something if v==''
  69                 var querystring = '<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(v) + '&format=json';
  70                 // *** &accept-language=<%#= request.user_preferred_languages.join(',') %>
  71                 // *** prefer current viewport
  72                 r[field.id]=false;
  73                 $.getJSON(querystring, function(json) { _this._gotGeocode(json,field); });
  74         };
  75
  76         r._gotGeocode=function(json,field) {
  77                 if (json.length==0) {
  78                         alert("Sorry, couldn't find that place.");      // *** internationalise
  79                         r[field.id]=null;
  80                         return;
  81                 }
  82                 field.value=json[0].display_name;
  83                 var lat=Number(json[0].lat), lon=Number(json[0].lon);
  84                 r[field.id]=[lat,lon];
  85                 // ** update markers
  86                 if (r.awaitingGeocode) {
  87                         r.awaitingGeocode=false;
  88                         r.requestRoute();
  89                 }
  90         };
  91
  92         // Drag and drop markers
  93
  94         r.handleDrop=function(e) {
  95                 console.log(r.map.mouseEventToLatLng(e.originalEvent))
  96         };
  97
  98         // Route-fetching UI
  99
 100         r.requestRoute=function() {
 101                 if (r.route_from && r.route_to) {
 102                         r.chosenEngine.getRoute(true,[r.route_from,r.route_to]);
 103                         // then, when the route has been fetched, it'll call the engine's gotRoute function
 104                 } else if (r.route_from==false || r.route_to==false) {
 105                         // we're waiting for a Nominatim response before we can request a route
 106                         r.awaitingGeocode=true;
 107                 }
 108         };
 109
 110         // Take an array of Leaflet LatLngs and draw it as a polyline
 111         r.setPolyline=function(line) {
 112                 if (r.polyline) map.removeLayer(r.polyline);
 113                 r.polyline=L.polyline(line, ROUTING_POLYLINE).addTo(r.map);
 114                 r.map.fitBounds(r.polyline.getBounds());
 115         };
 116
 117         // Take directions and write them out
 118         // data = { steps: array of [latlng, sprite number, instruction text, distance in metres] }
 119         // sprite numbers equate to OSRM's route_instructions turn values
 120         // *** translations?
 121         r.setItinerary=function(data) {
 122                 // Create base table
 123                 $("#content").removeClass("overlay-sidebar");
 124                 $('#sidebar_content').empty();
 125                 var html='<h2><a class="geolink" href="#" onclick="$(~.close_directions~).click();return false;"><span class="icon close"></span></a>Directions</h2>'.replace(/~/g,"'");
 126                 html+="<table id='turnbyturn' />";
 127                 $('#sidebar_content').html(html);
 128                 // Add each row
 129                 var cumulative=0;
 130                 for (var i=0; i<data.steps.length; i++) {
 131                         var step=data.steps[i];
 132                         // Distance
 133                         var dist=step[3];
 134                         if (dist<5) { dist=""; }
 135                         else if (dist<200) { dist=Math.round(dist/10)*10+"m"; }
 136                         else if (dist<1500) { dist=Math.round(dist/100)*100+"m"; }
 137                         else if (dist<5000) { dist=Math.round(dist/100)/10+"km"; }
 138                         else { dist=Math.round(dist/1000)+"km"; }
 139                         // Add to table
 140                         var row=$("<tr class='turn'/>");
 141                         row.append("<td class='direction i"+step[1]+"'> ");
 142                         row.append("<td class='instruction'>"+step[2]);
 143                         row.append("<td class='distance'>"+dist);
 144                         with ({ num: i, ll: step[0] }) {
 145                                 row.on('click',function(e) { r.clickTurn(num, ll); });
 146                         };
 147                         $('#turnbyturn').append(row);
 148                         cumulative+=step[3];
 149                 }
 150         };
 151         r.clickTurn=function(num,latlng) {
 152                 L.popup().setLatLng(latlng).setContent("<p>"+(num+1)+"</p>").openOn(r.map);
 153         };
 154
 155
 156         // Close all routing UI
 157
 158         r.close=function() {
 159                 $("#content").addClass("overlay-sidebar");
 160                 if (r.polyline) map.removeLayer(r.polyline);
 161         };
 162
 163         // Routing engine handling
 164
 165         // Add all engines
 166         var list=OSM.RoutingEngines.list;
 167         list.sort(function(a,b) { return a.name>b.name; });
 168         var select=r.jqSearch.find('select.routing_engines');
 169         for (var i=0; i<list.length; i++) {
 170                 // Set up JSONP callback
 171                 with ({num: i}) {
 172                         list[num].requestJSONP=function(url) {
 173                                 var script = document.createElement('script');
 174                                 script.src = url+r.name+".gotRoute"+num;
 175                                 document.body.appendChild(script);
 176                         };
 177                         r['gotRoute'+num]=function(data) { list[num].gotRoute(r,data); };
 178                 }
 179                 select.append("<option value='"+i+"'>"+list[i].name+"</option>");
 180         }
 181         r.engines=list;
 182         r.chosenEngine=list[0]; // default to first engine
 183
 184         // Choose an engine on dropdown change
 185         r.selectEngine=function(e) {
 186                 r.chosenEngine=r.engines[e.target.selectedIndex];
 187         };
 188         // Choose an engine by name
 189         r.chooseEngine=function(name) {
 190                 for (var i=0; i<r.engines.length; i++) {
 191                         if (r.engines[i].name==name) {
 192                                 r.chosenEngine=r.engines[i];
 193                                 r.jqSearch.find('select.routing_engines').val(i);
 194                         }
 195                 }
 196         };
 197
 198         return r;
 199 };