app/views/browse/start.rjs

   1 page.replace_html :sidebar_title, 'Browse'
   2 page.replace_html :sidebar_content, :partial => 'start'
   3 page << <<EOJ
   4
   5     var gml, sf, objList, currentFeature;
   6     OpenLayers.Feature.Vector.style['default'].strokeWidth = 3;
   7     OpenLayers.Feature.Vector.style['default'].cursor = "pointer";
   8
   9     function start() {
  10       openSidebar({ onclose: stopBrowse });
  11       var vectors = new OpenLayers.Layer.Vector();
  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
  25     function stopBrowse() {
  26         if (gml) {
  27             gml.destroy();
  28             gml = null;
  29         }
  30         if (sf) {
  31             sf.destroy();
  32             sf = null;
  33         }
  34         if (currentFeature) {
  35             currentFeature.destroy();
  36             currentFeature = null;
  37         }
  38     }
  39
  40     function startDrag() {
  41       $("drag_box").innerHTML='Drag a box on the map to select an area';
  42        box.activate();
  43        return false;
  44     };
  45     $("drag_box").onclick = startDrag;
  46
  47     function useMap() {
  48         var bounds = map.getExtent();
  49         setBounds(bounds);
  50         getData(bounds);
  51         return false;
  52     }
  53     $("use_map").onclick = useMap;
  54
  55     function endDrag(bbox) {
  56         var bounds = bbox.getBounds();
  57         setBounds(bounds);
  58         box.deactivate();
  59         getData(bounds);
  60         $("drag_box").innerHTML = "Manually select a different area";
  61     }
  62
  63     function getData(bounds) {
  64         $("status").innerHTML = "Loading...";
  65
  66         bounds.transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));
  67         var url = "/api/0.5/map?bbox="+bounds.toBBOX();
  68
  69         if (!gml) {
  70             var def = OpenLayers.Feature.Vector.style['default'];
  71             var style = new OpenLayers.Style();
  72             style.addRules([new OpenLayers.Rule(
  73               {'symbolizer':
  74                 {"Polygon": {'fillColor': '#ff0000', 'strokeColor': '#ff0000'},
  75                  "Line": {'fillColor': '#ffff00', 'strokeColor': '#000000', strokeOpacity: '0.4'},
  76                  "Point": {'fillColor': '#00ff00', 'strokeColor': '#00ff00'}}
  77               }
  78             )]);
  79             gml = new OpenLayers.Layer.GML("Data",url,
  80                     {format: OpenLayers.Format.OSM, formatOptions: {checkTags: true},
  81                      styleMap: new OpenLayers.StyleMap({'default': style, 'select': {'strokeColor': '#0000ff'}})
  82                     }
  83             );
  84             gml.events.register("loadend", gml, dataLoaded );
  85             map.addLayer(gml);
  86
  87             sf = new OpenLayers.Control.SelectFeature(gml, {'onSelect': onFeatureSelect});
  88             map.addControl(sf);
  89             sf.activate();
  90         } else {
  91             gml.setUrl(url);
  92         }
  93     }
  94
  95     function dataLoaded() {
  96         $("status").innerHTML = "Loaded " + this.features.length + " features. (<a href='"+ this.url+"'>API</a>)";
  97
  98         objList = document.createElement("ul");
  99         for (var i = 0; i < this.features.length; i++) {
 100             var feature = this.features[i];
 101
 102             // Type, for linking
 103             var type ="way";
 104             if (feature.geometry.CLASS_NAME == "OpenLayers.Geometry.Point") {
 105                 type = "node";
 106             }
 107             var nice_name = type.substr(0,1).toUpperCase() + type.substr(1,type.length);
 108             var li = document.createElement("li");
 109             li.appendChild(document.createTextNode(nice_name + " "));
 110
 111             // Link, for viewing in the tab
 112             var link = document.createElement("a");
 113             link.href =  "/browse/" + type + "/" + feature.osm_id;
 114             var name = feature.attributes.name || feature.osm_id;
 115             link.appendChild(document.createTextNode(name));
 116             link.feature = feature;
 117             link.onclick = OpenLayers.Function.bind(viewFeatureLink, link);
 118             li.appendChild(link);
 119
 120             objList.appendChild(li);
 121         }
 122         $("object").innerHTML = "";
 123         $("object").appendChild(objList);
 124     }
 125
 126     function viewFeatureLink() {
 127         var layer = this.feature.layer;
 128         for (var i = 0; i < layer.selectedFeatures.length; i++) {
 129             var f = layer.selectedFeatures[i];
 130             layer.drawFeature(f, layer.styleMap.createSymbolizer(f, "default"));
 131         }
 132         onFeatureSelect(this.feature);
 133         map.setCenter(this.feature.geometry.getBounds().getCenterLonLat());
 134         return false;
 135     }
 136
 137     function loadObjList() {
 138         $("object").innerHTML="";
 139         $("object").appendChild(objList);
 140         return false;
 141     }
 142
 143     function onFeatureSelect(feature) {
 144         // Unselect previously selected feature
 145         if (currentFeature) {
 146           currentFeature.layer.drawFeature(
 147             currentFeature, currentFeature.layer.styleMap.createSymbolizer(currentFeature, "default")
 148           );
 149         }
 150
 151         // Redraw in selected style
 152         feature.layer.drawFeature(
 153           feature, feature.layer.styleMap.createSymbolizer(feature, "select")
 154         );
 155
 156         // If the current object is the list, don't innerHTML="", since that could clar it.
 157         if ($("object").firstChild == objList) {
 158             $("object").removeChild(objList);
 159         } else {
 160             $("object").innerHTML = "";
 161         }
 162
 163         // Create a link back to the object list
 164         var div = document.createElement("div");
 165         var link = document.createElement("a");
 166         link.href="#";
 167         link.onclick = loadObjList;
 168         link.appendChild(document.createTextNode("Back to Object List"));
 169         div.appendChild(link)
 170         $("object").appendChild(div);
 171
 172         // Now the list of attributes
 173         var ul = document.createElement("ul");
 174         var type = "way";
 175         if (feature.geometry.CLASS_NAME == "OpenLayers.Geometry.Point") {
 176             type = "node";
 177         }
 178         var li = document.createElement("li");
 179         var link = document.createElement("a");
 180         link.href =  "/browse/"+type+"/"+feature.osm_id;
 181         link.appendChild(document.createTextNode(feature.osm_id));
 182         li.appendChild(link);
 183         ul.appendChild(li);
 184         for (var key in feature.attributes) {
 185             var li = document.createElement("li");
 186             var b = document.createElement("b");
 187             b.appendChild(document.createTextNode(key));
 188             li.appendChild(b);
 189             li.appendChild(document.createTextNode(": " + feature.attributes[key]));
 190             ul.appendChild(li);
 191         }
 192         $("object").appendChild(ul);
 193
 194         // Stash the currently drawn feature
 195         currentFeature = feature;
 196     }
 197
 198     function setBounds(bounds) {
 199       var epsg4326 = new OpenLayers.Projection("EPSG:4326");
 200       var decimals = Math.pow(10, Math.floor(map.getZoom() / 3));
 201
 202       bounds = bounds.clone().transform(map.getProjectionObject(), epsg4326);
 203
 204       $("minlon").innerHTML = Math.round(bounds.left * decimals) / decimals;
 205       $("minlat").innerHTML = Math.round(bounds.bottom * decimals) / decimals;
 206       $("maxlon").innerHTML = Math.round(bounds.right * decimals) / decimals;
 207       $("maxlat").innerHTML = Math.round(bounds.top * decimals) / decimals;
 208     }
 209
 210     start();
 211 EOJ