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-<!DOCTYPE html>
-<html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
- <meta name="apple-mobile-web-app-capable" content="yes">
- <title>OpenLayers Mousewheel Interval Example</title>
- <link rel="stylesheet" href="../theme/default/style.css" type="text/css">
- <link rel="stylesheet" href="style.css" type="text/css">
- <script src="../lib/OpenLayers.js"></script>
- <script type="text/javascript">
- var map, layer;
-
- function setCumulative() {
- var nav = map.getControlsByClass("OpenLayers.Control.Navigation")[0];
- var cumulative = document.getElementById("cumulative");
- nav.handlers.wheel.cumulative = cumulative.checked;
- }
-
- function init(){
- map = new OpenLayers.Map( 'map', {controls: [
- new OpenLayers.Control.Navigation(
- {mouseWheelOptions: {interval: 100}}
- ),
- new OpenLayers.Control.PanZoom(),
- new OpenLayers.Control.ArgParser(),
- new OpenLayers.Control.Attribution()
- ]} );
- layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
- "http://vmap0.tiles.osgeo.org/wms/vmap0",
- {layers: 'basic'} );
- map.addLayer(layer);
- map.zoomToMaxExtent();
- }
- </script>
- </head>
- <body onload="init()">
- <h1 id="title">OpenLayers Mousewheel Interval Example</h1>
-
- <div id="tags">
- performance, zoom by wheel
- </div>
-
- <div id="shortdesc">Let OpenLayers send less tile requests to the server when wheel-zooming.</div>
-
- <div id="map" class="smallmap"></div>
-
- <div id="docs">
- <p>This example shows how to configure the Navigation control to use
- the mousewheel in a less server resource consuming way: as long as you
- spin the mousewheel, no request will be sent to the server. Instead,
- the zoomlevel delta will be recorded. After a delay (in this example
- 100ms), a zoom action with the cumulated delta will be performed.</p>
- <div>
- <input id="cumulative" type="checkbox" checked="checked"
- onchange="setCumulative()"/>
- <label for="cumulative">Cumulative mode. If this mode is deactivated,
- only one zoom event will be performed after the delay.</label>
- </div>
-
- </div>
- </body>
-</html>