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 MapQuest engine
  15         *** add YOURS engine
  16         *** finish CloudMade 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         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;
  57         r.route_to=null;
  58         r.viaPoints=[];
  59         r.polyline=null;
  60         r.chosenEngine=null;
  61
  62         // Geocoding
  63
  64         r.geocode=function(id,event) { var _this=this;
  65                 var field=event.target;
  66                 var v=event.target.value;
  67                 // *** do something if v==''
  68                 var querystring = '<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(v) + '&format=json';
  69                 // *** &accept-language=<%#= request.user_preferred_languages.join(',') %>
  70                 // *** prefer current viewport
  71                 $.getJSON(querystring, function(json) { _this._gotGeocode(json,field); });
  72         };
  73
  74         r._gotGeocode=function(json,field) {
  75                 if (json.length==0) {
  76                         alert("Sorry, couldn't find that place.");      // *** internationalise
  77                         r[field.id]=null;
  78                         return;
  79                 }
  80                 field.value=json[0].display_name;
  81                 var lat=Number(json[0].lat), lon=Number(json[0].lon);
  82                 r[field.id]=[lat,lon];
  83                 // ** update markers
  84         };
  85
  86         // Route-fetching UI
  87
  88         r.requestRoute=function() {
  89                 if (r.route_from && r.route_to) {
  90                         r.chosenEngine.getRoute(true,[r.route_from,r.route_to]);
  91                         // then, when the route has been fetched, it'll call the engine's gotRoute function
  92                 }
  93         };
  94
  95         // Take an array of Leaflet LatLngs and draw it as a polyline
  96         r.setPolyline=function(line) {
  97                 if (r.polyline) map.removeLayer(r.polyline);
  98                 r.polyline=L.polyline(line, ROUTING_POLYLINE).addTo(r.map);
  99                 r.map.fitBounds(r.polyline.getBounds());
 100         };
 101
 102         // Take an array of directions and write it out
 103         // (we use OSRM's route_instructions format)
 104         // *** translations?
 105         r.setItinerary=function(steps) {
 106                 // Create base table
 107                 $("#content").removeClass("overlay-sidebar");
 108                 $('#sidebar_content').empty();
 109                 var html='<h2><a class="geolink" href="#" onclick="$(~.close_directions~).click();return false;"><span class="icon close"></span></a>Directions</h2>'.replace(/~/g,"'");
 110                 html+="<table id='turnbyturn' />";
 111                 $('#sidebar_content').html(html);
 112                 // Add each row
 113                 var cumulative=0;
 114                 for (var i=0; i<steps.length; i++) {
 115                         var step=steps[i];
 116                         var instCodes=step[0].split('-');
 117                         // Assemble instruction text
 118                         var instText="<b>"+(i+1)+".</b> ";
 119                         instText+=TURN_INSTRUCTIONS[instCodes[0]];
 120                         if (instCodes[1]) { instText+="exit "+instCodes[1]+" "; }
 121                         if (instCodes[0]!=15) { instText+=step[1] ? "<b>"+step[1]+"</b>" : "(unnamed)"; }
 122                         // Distance
 123                         var dist=step[2];
 124                         if (dist<5) { dist=""; }
 125                         else if (dist<200) { dist=Math.round(dist/10)*10+"m"; }
 126                         else if (dist<1500) { dist=Math.round(dist/100)*100+"m"; }
 127                         else if (dist<5000) { dist=Math.round(dist/100)/10+"km"; }
 128                         else { dist=Math.round(dist/1000)+"km"; }
 129                         // Add to table
 130                         var row=$("<tr class='turn'/>");
 131                         row.append("<td class='direction i"+instCodes[0]+"'> ");
 132                         row.append("<td class='instruction'>"+instText);
 133                         row.append("<td class='distance'>"+dist);
 134                         with ({num: i, dist: step[3]}) {
 135                                 row.on('click',function(e) {
 136                                         r.clickTurn(num, r.polyline.getLatLngs()[dist]);
 137                                 });
 138                         };
 139                         $('#turnbyturn').append(row);
 140                         cumulative+=step[2];
 141                 }
 142         };
 143         r.clickTurn=function(num,latlng) {
 144                 L.popup().setLatLng(latlng).setContent("<p>"+(num+1)+"</p>").openOn(r.map);
 145         };
 146
 147
 148         // Close all routing UI
 149
 150         r.close=function() {
 151                 $("#content").addClass("overlay-sidebar");
 152                 if (r.polyline) map.removeLayer(r.polyline);
 153         };
 154
 155         // Routing engine handling
 156
 157         // Add all engines
 158         var list=OSM.RoutingEngines.list;
 159         list.sort(function(a,b) { return a.name>b.name; });
 160         var select=r.jqSearch.find('select.routing_engines');
 161         for (var i=0; i<list.length; i++) {
 162                 // Set up JSONP callback
 163                 with ({num: i}) {
 164                         list[num].requestJSONP=function(url) {
 165                                 var script = document.createElement('script');
 166                                 script.src = url+r.name+".gotRoute"+num;
 167                                 document.body.appendChild(script);
 168                         };
 169                         r['gotRoute'+num]=function(data) { list[num].gotRoute(r,data); };
 170                 }
 171                 select.append("<option value='"+i+"'>"+list[i].name+"</option>");
 172         }
 173         r.engines=list;
 174         r.chosenEngine=list[0]; // default to first engine
 175
 176         // Choose an engine on dropdown change
 177         r.selectEngine=function(e) {
 178                 r.chosenEngine=r.engines[e.target.selectedIndex];
 179         };
 180         // Choose an engine by name
 181         r.chooseEngine=function(name) {
 182                 for (var i=0; i<r.engines.length; i++) {
 183                         if (r.engines[i].name==name) {
 184                                 r.chosenEngine=r.engines[i];
 185                                 r.jqSearch.find('select.routing_engines').val(i);
 186                         }
 187                 }
 188         };
 189
 190         return r;
 191 };