page.replace_html :sidebar_content, :partial => 'start'
page << <<EOJ
- var gml, sf, objList, currentFeature;
+ var gml, sf, objList, currentFeature, featureList;
OpenLayers.Feature.Vector.style['default'].strokeWidth = 3;
OpenLayers.Feature.Vector.style['default'].cursor = "pointer";
function start() {
- openSidebar({ onclose: stopBrowse });
- var vectors = new OpenLayers.Layer.Vector();
+ openSidebar({ onclose: stopBrowse });
+ var vectors = new OpenLayers.Layer.Vector();
- box = new OpenLayers.Control.DrawFeature(vectors, OpenLayers.Handler.RegularPolygon, {
- handlerOptions: {
- sides: 4,
- snapAngle: 90,
- irregular: true,
- persist: true,
- callbacks: { done: endDrag }
- }
- });
- map.addControl(box);
+ box = new OpenLayers.Control.DrawFeature(vectors, OpenLayers.Handler.RegularPolygon, {
+ handlerOptions: {
+ sides: 4,
+ snapAngle: 90,
+ irregular: true,
+ persist: true,
+ callbacks: { done: endDrag }
+ }
+ });
+ map.addControl(box);
+ map.events.register("moveend", map, validateLinks);
+ map.events.triggerEvent("moveend");
+ if (map.getZoom() >= 16) {
+ useMap();
+ } else {
+ $("status").innerHTML = "Zoom in or Select an area of the map to view.";
+ }
}
function stopBrowse() {
currentFeature.destroy();
currentFeature = null;
}
+ map.events.unregister("moveend", map, validateLinks);
}
function startDrag() {
function useMap() {
var bounds = map.getExtent();
- setBounds(bounds);
- getData(bounds);
+ getData(bounds);
+ return false;
}
$("use_map").onclick = useMap;
function endDrag(bbox) {
var bounds = bbox.getBounds();
- setBounds(bounds);
box.deactivate();
getData(bounds);
$("drag_box").innerHTML = "Manually select a different area";
}
+ function displayFeatureWarning() {
+ $("status").innerHTML = "";
+ var div = document.createElement("div");
+ var p = document.createElement("p");
+ p.appendChild(document.createTextNode("You have loaded an area which contains " + featureList.length + " features. In general, some browsers may not cope well with displaying this quantity of data. Generally, browsers work best at displaying less than 100 features at a time: doing anything else may make your browser slow/unresponsive. If you are sure you want to display this data, you may do so by clicking the button below."));
+ div.appendChild(p);
+ var input = document.createElement("input");
+ input.type = "submit";
+ input.value = "Load Data";
+ input.onclick = loadFeatureList;
+ div.appendChild(input);
+ $("object").innerHTML="";
+ $("object").appendChild(div);
+ }
+
+ function loadFeatureList() {
+ gml.addFeatures(featureList);
+ gml.events.triggerEvent("loadend");
+ return false;
+ }
+
+ function customDataLoader(request) {
+ var doc = request.responseXML;
+
+ if (!doc || !doc.documentElement) {
+ doc = request.responseText;
+ }
+
+ var options = {};
+
+ OpenLayers.Util.extend(options, this.formatOptions);
+ if (this.map && !this.projection.equals(this.map.getProjectionObject())) {
+ options.externalProjection = this.projection;
+ options.internalProjection = this.map.getProjectionObject();
+ }
+
+ var gml = this.format ? new this.format(options) : new OpenLayers.Format.GML(options);
+ var features = gml.read(doc);
+ if (!this.maxFeatures || features.length <= this.maxFeatures) {
+ this.addFeatures(features);
+ this.events.triggerEvent("loadend");
+ featureList = [];
+ } else {
+ featureList = features;
+ displayFeatureWarning();
+ }
+ }
+
function getData(bounds) {
- $("status").innerHTML = "Loading...";
bounds.transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));
+ var size = bounds.getWidth() * bounds.getHeight();
+ if (size > 0.25) {
+ $("status").innerHTML = "Unable to load: Bounding box size of " + size + " is too large. (Must be smaller than 0.25)<br />";
+ return;
+ }
+
var url = "/api/0.5/map?bbox="+bounds.toBBOX();
+ loadGML(url);
+ }
+ function loadGML(url) {
+ $("status").innerHTML = "Loading...";
if (!gml) {
- var def = OpenLayers.Feature.Vector.style['default'];
var style = new OpenLayers.Style();
style.addRules([new OpenLayers.Rule(
{'symbolizer':
)]);
gml = new OpenLayers.Layer.GML("Data",url,
{format: OpenLayers.Format.OSM, formatOptions: {checkTags: true},
- styleMap: new OpenLayers.StyleMap({'default': style, 'select': {'strokeColor': '#0000ff'}})
+ maxFeatures: 100, requestSuccess: customDataLoader,
+ styleMap: new OpenLayers.StyleMap({'default': style, 'select': {'strokeColor': '#0000ff', strokeWidth: 8}})
}
);
gml.events.register("loadend", gml, dataLoaded );
map.addLayer(gml);
sf = new OpenLayers.Control.SelectFeature(gml, {'onSelect': onFeatureSelect});
+ sf.handler.stopDown = false;
+ sf.handler.stopUp = false;
map.addControl(sf);
sf.activate();
+
} else {
gml.setUrl(url);
}
+
+ currentFeature = null;
}
-
function dataLoaded() {
$("status").innerHTML = "Loaded " + this.features.length + " features. (<a href='"+ this.url+"'>API</a>)";
function loadObjList() {
$("object").innerHTML="";
$("object").appendChild(objList);
+ return false;
}
function onFeatureSelect(feature) {
currentFeature = feature;
}
- function setBounds(bounds) {
- var epsg4326 = new OpenLayers.Projection("EPSG:4326");
- var decimals = Math.pow(10, Math.floor(map.getZoom() / 3));
-
- bounds = bounds.clone().transform(map.getProjectionObject(), epsg4326);
+ function validateLinks() {
+ var bounds = this.getExtent();
+ bounds = bounds.clone().transform(map.getProjectionObject(), epsg4326);
- $("minlon").innerHTML = Math.round(bounds.left * decimals) / decimals;
- $("minlat").innerHTML = Math.round(bounds.bottom * decimals) / decimals;
- $("maxlon").innerHTML = Math.round(bounds.right * decimals) / decimals;
- $("maxlat").innerHTML = Math.round(bounds.top * decimals) / decimals;
+ if (bounds.getWidth() * bounds.getHeight() > 0.25) {
+ $("use_map").style.display = "none";
+ } else {
+ $("use_map").style.display = "inline";
+ }
}
-
start();
EOJ
projects / rails.git / blobdiff