draw-feature.html
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Draw Feature Example</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
<link rel="stylesheet" href="style.css" type="text/css" />
<style type="text/css">
#controlToggle li {
list-style: none;
}
p {
width: 512px;
}
</style>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var map, drawControls;
OpenLayers.Util.onImageLoadErrorColor = "transparent";
function init(){
map = new OpenLayers.Map('map');
var wmsLayer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://labs.metacarta.com/wms/vmap0?", {layers: 'basic'});
var pointLayer = new OpenLayers.Layer.Vector("Point Layer");
var lineLayer = new OpenLayers.Layer.Vector("Line Layer");
var polygonLayer = new OpenLayers.Layer.Vector("Polygon Layer");
map.addLayers([wmsLayer, pointLayer, lineLayer, polygonLayer]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.addControl(new OpenLayers.Control.MousePosition());
var options = {handlerOptions: {freehand: true}};
drawControls = {
point: new OpenLayers.Control.DrawFeature(pointLayer,
OpenLayers.Handler.Point),
line: new OpenLayers.Control.DrawFeature(lineLayer,
OpenLayers.Handler.Path, options),
polygon: new OpenLayers.Control.DrawFeature(polygonLayer,
OpenLayers.Handler.Polygon, options)
};
for(var key in drawControls) {
map.addControl(drawControls[key]);
}
map.setCenter(new OpenLayers.LonLat(0, 0), 3);
document.getElementById('noneToggle').checked = true;
}
function toggleControl(element) {
for(key in drawControls) {
var control = drawControls[key];
if(element.value == key && element.checked) {
control.activate();
} else {
control.deactivate();
}
}
}
</script>
</head>
<body onload="init()">
<h1 id="title">OpenLayers Draw Feature Example</h1>
<div id="tags"></div>
<p id="shortdesc">
Demonstrate on-screen digitizing tools for point, line, and polygon creation.
</p>
<div id="map" class="smallmap"></div>
<ul id="controlToggle">
<li>
<input type="radio" name="type" value="none" id="noneToggle"
onclick="toggleControl(this);" checked="checked" />
<label for="noneToggle">navigate</label>
</li>
<li>
<input type="radio" name="type" value="point" id="pointToggle" onclick="toggleControl(this);" />
<label for="pointToggle">draw point</label>
</li>
<li>
<input type="radio" name="type" value="line" id="lineToggle" onclick="toggleControl(this);" />
<label for="lineToggle">draw line</label>
</li>
<li>
<input type="radio" name="type" value="polygon" id="polygonToggle" onclick="toggleControl(this);" />
<label for="polygonToggle">draw polygon</label>
</li>
</ul>
<div id="docs">
<p>Feature digitizing is in freehand mode by default. In freehand mode, the mouse is treated as a pen.
Drawing begins on mouse down, continues with every mouse move, and ends with mouse up.</p>
<p>To turn freehand mode off, hold down the shift key while digitizing. With freehand mode off, one
vertex is added with each click and double-clicks finish drawing. Freehand mode can be toggled on and off
at any time while drawing.</p>
</div>
</body>
</html>