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<title>OpenLayers Regular Polygon Example</title>
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p {
width: 512px;
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#config {
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position: relative;
height: 8em;
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width: 12em;
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<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var map, polygonControl;
function init(){
map = new OpenLayers.Map('map');
var wmsLayer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0?", {layers: 'basic'});
var polygonLayer = new OpenLayers.Layer.Vector("Polygon Layer");
map.addLayers([wmsLayer, polygonLayer]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.addControl(new OpenLayers.Control.MousePosition());
polyOptions = {sides: 4};
polygonControl = new OpenLayers.Control.DrawFeature(polygonLayer,
OpenLayers.Handler.RegularPolygon,
{handlerOptions: polyOptions});
map.addControl(polygonControl);
map.setCenter(new OpenLayers.LonLat(0, 0), 3);
document.getElementById('noneToggle').checked = true;
document.getElementById('irregularToggle').checked = false;
}
function setOptions(options) {
polygonControl.handler.setOptions(options);
}
function setSize(fraction) {
var radius = fraction * map.getExtent().getHeight();
polygonControl.handler.setOptions({radius: radius,
angle: 0});
}
</script>
</head>
<body onload="init()">
<h1 id="title">OpenLayers Regular Polygon Example</h1>
<div id="tags">
vector, feature, regularpolygon, drawing, draw, advanced
</div>
<p id="shortdesc">
Shows how to use the RegularPolygon handler to draw features with
different numbers of sides.
</p>
<div id="map" class="smallmap"></div>
<div id="config">
<ul id="controls"><b>Map Controls</b>
<li>
<input type="radio" name="type"
value="none" id="noneToggle"
onclick="polygonControl.deactivate()"
checked="checked" />
<label for="noneToggle">navigate</label>
</li>
<li>
<input type="radio" name="type"
value="polygon" id="polygonToggle"
onclick="polygonControl.activate()" />
<label for="polygonToggle">draw polygon</label>
</li>
</ul>
<table id="options">
<tbody>
<tr>
<th>Draw Option</th>
<th>Value</th>
</tr>
<tr>
<td>
shape
</td>
<td>
<select name="sides"
onchange="setOptions({sides: parseInt(this.value)})">
<option value="3">triangle</option>
<option value="4" selected="selected">square</option>
<option value="5">pentagon</option>
<option value="6">hexagon</option>
<option value="40">circle</option>
</select>
</td>
</tr>
<tr>
<td>
snap angle
</td>
<td>
<select name="angle"
onchange="setOptions({snapAngle: parseFloat(this.value)})">
<option value="" selected="selected">no snap</option>
<option value="15">15°</option>
<option value="45">45°</option>
<option value="90">90°</option>
</select>
</td>
</tr>
<tr>
<td>
size
</td>
<td>
<select name="size"
onchange="setSize(parseFloat(this.value))">
<option value="" selected="selected">variable</option>
<option value="0.1">small</option>
<option value="0.2">medium</option>
<option value="0.4">large</option>
</select>
</td>
</tr>
<tr>
<td>
irregular
</td>
<td>
<input id="irregularToggle" name="irregular"
type="checkbox"
onchange="setOptions({irregular: this.checked})") />
</td>
</tr>
</tbody>
</table>
</div>
<p>
Regular polygons can be drawn by pointing a DrawFeature control to the
RegularPolygon handler class. The options above demonstrate how the
handler can be configured. Note if you are in angle snapping mode (if
the snap angle is non-null) and you hold down the <b>Shift</b> key, you
will toggle to non-snapping mode.
</p>
<p>
The <i>irregular</i> option allows drawing of irregular polygons. With this option, the fixed radius option is ignored.
</body>
</html>
