4b9393c809
git-svn-id: http://svn.openlayers.org/trunk/openlayers@9285 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
156 lines
7.5 KiB
HTML
156 lines
7.5 KiB
HTML
<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>OpenLayers: OpenMNND</title>
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<link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
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<link rel="stylesheet" href="style.css" type="text/css" />
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<script src="../lib/OpenLayers.js"></script>
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<script type="text/javascript">
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var map, layer;
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function init(){
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OpenLayers.ProxyHost="/proxy/?url=";
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map = new OpenLayers.Map('map', {'maxResolution':'auto', maxExtent: new OpenLayers.Bounds(-203349.72008129774,4816309.33,1154786.8041952979,5472346.5), projection: 'EPSG:26915' } );
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layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
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["http://geoint.lmic.state.mn.us/cgi-bin/wms"], {layers: 'fsa'} );
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map.addLayer(layer);
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wfs_url = "http://prototype.openmnnd.org/cgi-bin/mapserv.exe?map=openmnndwfs/openmnndwfs.map";
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wms = new OpenLayers.Layer.WMS("Minnesota Parcels (WMS)", wfs_url, {'layers':'streams', 'transparent': true, 'format':'image/gif'});
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map.addLayer(wms);
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wfs = new OpenLayers.Layer.WFS("Minnesota Streams (WFS)", wfs_url, {'typename':'streams'}, {ratio:1.25, minZoomLevel:4, style: OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['default'])});
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// preFeatureInsert can be used to set style before the feature is drawn
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wfs.preFeatureInsert= function(feature) { feature.style.strokeWidth="3"; feature.style.strokeColor="blue";
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}
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wfs.onFeatureInsert = function(feature) {
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OpenLayers.Util.getElement('stream_features').innerHTML = feature.layer.features.length;
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}
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map.addLayer(wfs);
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// Or a style can be set on the layer.
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pwfsstyle = OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['default']);
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OpenLayers.Util.extend(pwfsstyle, {'fillColor': 'green'});
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pwfs = new OpenLayers.Layer.WFS("Minnesota Plat (WFS)", wfs_url,
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{'typename':'plat'},
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{
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ratio:1.25,
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minZoomLevel:8,
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extractAttributes: true,
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style: pwfsstyle
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});
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pwfs.onFeatureInsert= function(feature) {
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OpenLayers.Util.getElement('plat_features').innerHTML = feature.layer.features.length;
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}
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map.addLayer(pwfs);
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rstyle = OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['default']);
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OpenLayers.Util.extend(rstyle, {'strokeColor': 'white', strokeWidth: "4"});
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rwfs = new OpenLayers.Layer.WFS("Minnesota Roads (WFS)", wfs_url, {'typename':'roads'},
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{ratio:1.25, minZoomLevel:7, extractAttributes: true, style:rstyle});
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rwfs.onFeatureInsert= function(feature) {
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OpenLayers.Util.getElement('road_features').innerHTML = feature.layer.features.length;
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}
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map.addLayer(rwfs);
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map.events.register('moveend', null, function() {
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OpenLayers.Util.getElement('stream_features').innerHTML = "0";
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OpenLayers.Util.getElement('road_features').innerHTML = "0";
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OpenLayers.Util.getElement('plat_features').innerHTML = "0";
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});
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var ls = new OpenLayers.Control.LayerSwitcher();
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map.addControl(ls);
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drawControls = {
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selectPlat: new OpenLayers.Control.SelectFeature(pwfs, {callbacks: {'up':feature_info,'over':feature_info_hover}}),
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selectRoad: new OpenLayers.Control.SelectFeature(rwfs, {callbacks: {'up':feature_info,'over':feature_info_hover}})
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};
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for(var key in drawControls) {
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map.addControl(drawControls[key]);
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}
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drawControls.selectPlat.activate();
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map.zoomToExtent(new OpenLayers.Bounds(303232.550864,5082911.694856,305885.161263,5084486.682281));
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}
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function toggleControl(element) {
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for(key in drawControls) {
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var control = drawControls[key];
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if(element.value == key && element.checked) {
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control.activate();
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} else {
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control.deactivate();
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}
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}
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}
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var displayedFeature = null;
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function feature_info_hover(feature) {
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if (displayedFeature != feature &&
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(!feature.layer.selectedFeatures.length ||
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(feature.layer.selectedFeatures[0] == feature))) {
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feature_info(feature);
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displayedFeature = feature;
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}
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}
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function feature_info(feature) {
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var html = "<ul>";
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for(var i in feature.attributes)
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html += "<li><b>" + i + "</b>: "+ feature.attributes[i] + "</li>";
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html += "</ul>";
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OpenLayers.Util.getElement('feature_info').innerHTML = html;
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}
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</script>
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</head>
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<body onload="init()">
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<h1 id="title">OpenMNND WFS</h1>
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<p id="shortdesc">This example shows the use of a WFS service rendered using the OpenLayers vector library.</p>
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<div id="map" class="smallmap"></div>
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<div id="docs">
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<p>
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This is an example that shows rendering a WFS service using OpenLayer vectors in the browser. The OpenLayers code will download the GML
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from the WFS service for each layer, parse it and create features using the OL vector library to draw the features on the map. For
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more information on the vector library, please visit <a href="http://trac.openlayers.org/wiki/Documentation/VectorSupport">vector support wiki</a>.
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In this example there are 4 layers shown on the map. The base layer and parcel layer are created from a WMS service using the OpenLayers.Layer.WMS object.
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The streams, roads, and plat layers are drawn from a WFS service using the OpenLayers.Layer.WFS object.
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</p>
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<p>
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Rendering WFS layers into vectors is possible, but you need to be cautions when showing the features on the map. Testing has shown that when
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you renderer more than 200 vectors in the browser the performance decreases dramatically. Also features that have a lot of vertices
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can cause performance issues. In this example the parcel layer is rendered as a WMS layer because at the time of developing this example
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there where a handful of features that had too many vertices to render without killing the browser resources.
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There are a number of properties that can be set for each WFS layer, such color and line weight using style properties such as strokeColor and strokeWidth.
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You can also get feature attributes from the WFS services using the extractAttribute property. View the source to see the example code.
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</p>
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</div>
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<div id="info">
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<ul>
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<li>Streams: Feature Count <span id="stream_features">0</span></li>
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<li>Plat: Feature Count <span id="plat_features">0</span></li>
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<li>Roads: Feature Count <span id="road_features">0</span></li>
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</ul>
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<div id="feature_info">
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</div>
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<ul>
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<li>
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<input type="radio" name="type" value="selectRoad" id="selectToggle" onclick="toggleControl(this);" />
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<label for="selectToggle">select road</label>
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</li>
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<li>
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<input type="radio" name="type" value="selectPlat" id="selectToggle" onclick="toggleControl(this);" checked=checked />
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<label for="selectToggle">select polygon</label>
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</li>
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</ul>
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</div>
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</body>
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</html>
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