1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>OpenLayers Restricted Extent 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/Firebug/firebug.js"></script> <script src="../lib/OpenLayers.js"></script> <script type="text/javascript"> var map = null; var extent = new OpenLayers.Bounds(-180, -90, 180, 90); function init() { var options = { restrictedExtent: extent } map = new OpenLayers.Map('map', options); var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS", "http://labs.metacarta.com/wms/vmap0?", {layers: 'basic'} ); map.addLayers([wms]); map.setCenter(extent, 1); document.getElementById("toggle").checked = true; } function toggleRestrictedExtent() { if(map.restrictedExtent == null) { map.setOptions({restrictedExtent: extent}); } else { map.setOptions({restrictedExtent: null}); } } </script> </head> <body onload="init()"> <h3 id="title">OpenLayers Restricted Extent Example</h3> <p id="shortdesc"> Don't let users drag outside the map extent: instead, limit dragging such that the extent of the layer is the maximum viewable area. </p> <div id="map" class="smallmap"></div> <p> Map navigation is limited by a combination of map and layer properties. The base layer resolutions array controls the resolutions (or zoom levels) available. The resolutions can be limited by setting a maxResolution property or by explicitly specifying a resolutions array. </p> <p> Navigation limited by the maxExtent property. A map cannot be panned so that the center of the viewport is outside of the bounds specified in maxExtent. If you wish to further restrict panning, use the restrictedExtent property. With restrictedExtent set, the map cannot be panned beyond the given bounds. If the maxResolution allows the map to be zoomed to a resolution that displays an area bigger than the restrictedExtent, the viewport will remain centered on the restrictedExtent. </p> <p> <input type="checkbox" id="toggle" checked="checked" onclick="toggleRestrictedExtent();" /> <label for="toggle"> Toggle restricted extent (to [-180, -90, 180, 90]). </label> </body> </html> |