markerResize.html
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
#map {
width: 512px;
height: 512px;
border: 1px solid black;
}
</style>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
<!--
var map, layer;
var size, icon;
function init(){
map = new OpenLayers.Map('map');
layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} );
map.addLayer(layer);
var markers = new OpenLayers.Layer.Markers( "Markers" );
map.addLayer(markers);
size = new OpenLayers.Size(50,50);
calculateOffset = function(size) {
return new OpenLayers.Pixel(-(size.w/2), -size.h); };
icon = new OpenLayers.Icon(
'http://boston.openguides.org/markers/AQUA.png',
size, null, calculateOffset);
markers.addMarker(
new OpenLayers.Marker(new OpenLayers.LonLat(-180,90), icon));
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.zoomToMaxExtent();
}
function resize() {
size = new OpenLayers.Size(size.w + 10, size.h + 10);
icon.setSize(size);
}
// -->
</script>
</head>
<body onload="init()">
<h1>OpenLayers Example</h1>
<div id="map"></div>
<div style="background-color:purple" onclick="resize()"> click to resize marker</div>
</body>
</html>