7da6a3540e
thanks to all the contributors who helped put this together. I'm not exactly sure of what's going to happen with this, but for now, at http://openlayers.org/dev/doc/examples.html you can see links to all the examples *with descriptions*. Hooray! git-svn-id: http://svn.openlayers.org/trunk/openlayers@5362 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
96 lines
3.2 KiB
HTML
96 lines
3.2 KiB
HTML
<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>OpenLayers Layer Opacity Example</title>
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<style type="text/css">
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body {
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font-family: sans-serif;
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}
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#map {
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width: 512px;
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height: 512px;
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border: 1px solid lightgray;
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}
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p {
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width: 512px;
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}
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a {
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text-decoration: none;
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color: black;
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font-weight: bold;
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font-size: 1.1em;
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}
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#opacity {
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padding: 0;
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text-align: center;
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width: 2em;
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font-family: sans-serif;
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background: transparent;
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color: black;
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border: 0;
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}
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p.note {
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font-style: italic;
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font-size: 0.8em;
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}
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</style>
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<script src="../lib/OpenLayers.js"></script>
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<script type="text/javascript">
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var map = null;
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var shade = null;
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var maxOpacity = 0.9;
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var minOpacity = 0.1;
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function changeOpacity(byOpacity) {
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var newOpacity = (parseFloat(OpenLayers.Util.getElement('opacity').value) + byOpacity).toFixed(1);
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newOpacity = Math.min(maxOpacity,
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Math.max(minOpacity, newOpacity));
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OpenLayers.Util.getElement('opacity').value = newOpacity;
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shade.setOpacity(newOpacity);
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}
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function init(){
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var options = {
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projection: "EPSG:26912",
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units: 'm',
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maxExtent: new OpenLayers.Bounds(455402, 4967657, 473295, 4984095),
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maxResolution: 'auto',
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maxZoomLevel: 8
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};
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map = new OpenLayers.Map('map', options);
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var drg = new OpenLayers.Layer.WMS("Topo Maps",
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"http://terraservice.net/ogcmap.ashx",
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{layers: "DRG"});
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shade = new OpenLayers.Layer.WMS("Shaded Relief",
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"http://ims.cr.usgs.gov/servlet19/com.esri.wms.Esrimap/USGS_EDC_Elev_NED_3",
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{layers: "HR-NED.IMAGE", reaspect: "false", transparent: 'true'},
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{isBaseLayer: false, opacity: 0.3});
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map.addLayers([drg, shade]);
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map.addControl(new OpenLayers.Control.LayerSwitcher());
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map.setCenter(new OpenLayers.LonLat(464348.5,4975876), 1);
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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">Layer Opacity Example</h1>
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<div id="tags"></div>
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<p id="shortdesc">
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Demonstrate a change in the opacity for an overlay layer.
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</p>
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<div id="map"></div>
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<div id="docs">
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<p>
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Note that if you also have the setOpacity method defined on the Layer
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class, you can tweak the layer opacity after it has been added to the map.
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</p>
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<p>Opacity:
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<a title="decrease opacity" href="javascript: changeOpacity(-0.1);"><<</a>
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<input id="opacity" type="text" value="0.3" size="3" disabled="true" />
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<a title="increase opacity" href="javascript: changeOpacity(0.1);">>></a>
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</p>
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<p class="note">IE users: Wait until the shade layer has finished loading to try this.</p>
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</div>
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</body>
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</html>
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