app/views/browse/start.rjs

   1 page.replace_html :sidebar_title, 'Browse'
   2 page.replace_html :sidebar_content, :partial => 'start'
   3 page << <<EOJ
   4  var gml, sf, obj_list, currentFeature;
   5  OpenLayers.Feature.Vector.style['default'].strokeWidth = 3;
   6  OpenLayers.Feature.Vector.style['default'].cursor = "pointer";
   7  function start() {
   8    openSidebar({ onclose: stopBrowse });
   9    vectors = new OpenLayers.Layer.Vector("Vector Layer", {
  10      displayInLayerSwitcher: false
  11    });
  12
  13    box = new OpenLayers.Control.DrawFeature(vectors, OpenLayers.Handler.RegularPolygon, {
  14      handlerOptions: {
  15        sides: 4,
  16        snapAngle: 90,
  17        irregular: true,
  18        persist: true,
  19        callbacks: { done: endDrag }
  20      }
  21    });
  22    map.addControl(box);
  23  }
  24  function stopBrowse() {
  25      if (gml) {
  26        gml.destroy();
  27        gml = null;
  28      }
  29      if (sf) {
  30          sf.destroy();
  31          sf = null;
  32      }
  33  }
  34  function startDrag() {
  35    $("drag_box").innerHTML='Drag a box on the map to select an area';
  36     box.activate();
  37     return false;
  38  };
  39
  40  $("drag_box").onclick = startDrag;
  41
  42   function useMap() {
  43       var bounds = map.getExtent();
  44       setBounds(bounds);
  45       getData(bounds);
  46   }
  47   $("use_map").onclick = useMap;
  48   function dataLoaded() {
  49       $("status").innerHTML = "Loaded " + this.features.length + " features. (<a href='"+ this.url+"'>API</a>)";
  50
  51       obj_list = document.createElement("ul");
  52       for (var i = 0; i < this.features.length; i++) {
  53           var feature = this.features[i];
  54           var type ="way";
  55           if (feature.geometry.CLASS_NAME == "OpenLayers.Geometry.Point") {
  56               type = "node";
  57           }
  58           var nice_name = type.substr(0,1).toUpperCase() + type.substr(1,type.length);
  59           var li = document.createElement("li");
  60           li.appendChild(document.createTextNode(nice_name + " "));
  61           var link = document.createElement("a");
  62           link.href =  "/browse/"+type+"/"+feature.osm_id;
  63           var name = feature.attributes.name || feature.osm_id;
  64           link.appendChild(document.createTextNode(name));
  65           li.appendChild(link);
  66           li.appendChild(document.createTextNode(" "));
  67           var link = document.createElement("a");
  68           link.href =  "#";
  69           link.appendChild(document.createTextNode("+"));
  70           link.feature = feature;
  71           link.onclick = OpenLayers.Function.bind(function() {
  72             var layer = this.feature.layer;
  73             for (var i = 0; i < layer.selectedFeatures.length; i++) {
  74                 var f = layer.selectedFeatures[i];
  75                 layer.drawFeature(f, layer.styleMap.createSymbolizer(f, "default"));
  76             }
  77             on_feature_hover(this.feature);
  78             map.setCenter(this.feature.geometry.getBounds().getCenterLonLat());
  79           }, link);
  80           li.appendChild(link);
  81           obj_list.appendChild(li);
  82       }
  83       $("object").innerHTML = "";
  84       $("object").appendChild(obj_list);
  85   }
  86   function getData(bounds) {
  87     $("status").innerHTML = "Loading...";
  88     bounds.transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));
  89     var url = "/api/0.5/map?bbox="+bounds.toBBOX();
  90     if (!gml) {
  91         var def = OpenLayers.Feature.Vector.style['default'];
  92         var style = new OpenLayers.Style();
  93         style.addRules([new OpenLayers.Rule(
  94           {'symbolizer':
  95             {"Polygon": {'fillColor': '#ff0000', 'strokeColor': '#ff0000'},
  96              "Line": {'fillColor': '#ffff00', 'strokeColor': '#000000', strokeOpacity: '0.4'},
  97              "Point": {'fillColor': '#00ff00', 'strokeColor': '#00ff00'}}
  98           }
  99         )]);
 100         gml = new OpenLayers.Layer.GML("Data",url,
 101                 {format: OpenLayers.Format.OSM, formatOptions: {checkTags: true},
 102                  styleMap: new OpenLayers.StyleMap({'default': style, 'select': {'strokeColor': '#0000ff'}})
 103                 }
 104         );
 105         gml.events.register("loadend", gml, dataLoaded );
 106         map.addLayer(gml);
 107         sf = new OpenLayers.Control.SelectFeature(gml, {'onSelect': on_feature_hover});
 108         map.addControl(sf);
 109         sf.activate();
 110
 111     } else {
 112         gml.setUrl(url);
 113     }
 114   }
 115   function endDrag(bbox) {
 116     var bounds = bbox.getBounds();
 117     setBounds(bounds);
 118     box.deactivate();
 119     getData(bounds);
 120     $("drag_box").innerHTML = "Select an area to see features";
 121
 122   }
 123   function loadObjList() {
 124       $("object").innerHTML="";
 125       $("object").appendChild(obj_list);
 126   }
 127
 128   function on_feature_hover(feature) {
 129       if (currentFeature) {
 130         currentFeature.layer.drawFeature(
 131           currentFeature, currentFeature.layer.styleMap.createSymbolizer(currentFeature, "default")
 132         );
 133       }
 134       feature.layer.drawFeature(
 135         feature, feature.layer.styleMap.createSymbolizer(feature, "select")
 136       );
 137       if ($("object").firstChild == $("object").obj_list) {
 138         $("object").removeChild(obj_list);
 139       } else {
 140         $("object").innerHTML = "";
 141       }
 142       var div = document.createElement("div");
 143       var link = document.createElement("a");
 144       link.href="#";
 145       link.onclick = loadObjList;
 146       link.appendChild(document.createTextNode("Back to Object List"));
 147       div.appendChild(link)
 148       $("object").appendChild(div);
 149       var ul = document.createElement("ul");
 150       var type ="way";
 151       if (feature.geometry.CLASS_NAME == "OpenLayers.Geometry.Point") {
 152           type = "node";
 153       }
 154       var li = document.createElement("li");
 155       var link = document.createElement("a");
 156       link.href =  "/browse/"+type+"/"+feature.osm_id;
 157       link.appendChild(document.createTextNode(feature.osm_id));
 158       li.appendChild(link);
 159       ul.appendChild(li);
 160       for (var key in feature.attributes) {
 161           var li = document.createElement("li");
 162           li.appendChild(document.createTextNode(key + ": " + feature.attributes[key]));
 163           ul.appendChild(li);
 164       }
 165       $("object").appendChild(ul);
 166       currentFeature = feature;
 167   }
 168   function setBounds(bounds) {
 169     var epsg4326 = new OpenLayers.Projection("EPSG:4326");
 170     var decimals = Math.pow(10, Math.floor(map.getZoom() / 3));
 171
 172     bounds = bounds.clone().transform(map.getProjectionObject(), epsg4326);
 173
 174     $("minlon").innerHTML = Math.round(bounds.left * decimals) / decimals;
 175     $("minlat").innerHTML = Math.round(bounds.bottom * decimals) / decimals;
 176     $("maxlon").innerHTML = Math.round(bounds.right * decimals) / decimals;
 177     $("maxlat").innerHTML = Math.round(bounds.top * decimals) / decimals;
 178   }
 179
 180 start();
 181 EOJ