vector-formats.html
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Vector Formats</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">
input, select, textarea {
font: 0.9em Verdana, Arial, sans-serif;
}
#leftcol {
position: absolute;
top: 0;
left: 1em;
padding: 0;
width: 517px;
}
#map {
width: 512px;
height: 225px;
border: 1px solid #ccc;
}
#input {
width: 512px;
}
#text {
font-size: 0.85em;
margin: 1em 0 1em 0;
width: 100%;
height: 10em;
}
#info {
position: relative;
padding: 2em 0;
margin-left: 540px;
}
#output {
font-size: 0.8em;
width: 100%;
height: 512px;
border: 0;
}
p {
margin: 0;
padding: 0.75em 0 0.75em 0;
}
</style>
<script src="../lib/Firebug/firebug.js"></script>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var map, vectors, formats;
function updateFormats() {
var in_options = {
'internalProjection': map.baseLayer.projection,
'externalProjection': new OpenLayers.Projection(OpenLayers.Util.getElement("inproj").value)
};
var out_options = {
'internalProjection': map.baseLayer.projection,
'externalProjection': new OpenLayers.Projection(OpenLayers.Util.getElement("outproj").value)
};
var gmlOptions = {
featureType: "feature",
featureNS: "http://example.com/feature"
};
var gmlOptionsIn = OpenLayers.Util.extend(
OpenLayers.Util.extend({}, gmlOptions),
in_options
);
var gmlOptionsOut = OpenLayers.Util.extend(
OpenLayers.Util.extend({}, gmlOptions),
out_options
);
formats = {
'in': {
wkt: new OpenLayers.Format.WKT(in_options),
geojson: new OpenLayers.Format.GeoJSON(in_options),
georss: new OpenLayers.Format.GeoRSS(in_options),
gml2: new OpenLayers.Format.GML.v2(gmlOptionsIn),
gml3: new OpenLayers.Format.GML.v3(gmlOptionsIn),
kml: new OpenLayers.Format.KML(in_options)
},
'out': {
wkt: new OpenLayers.Format.WKT(out_options),
geojson: new OpenLayers.Format.GeoJSON(out_options),
georss: new OpenLayers.Format.GeoRSS(out_options),
gml2: new OpenLayers.Format.GML.v2(gmlOptionsOut),
gml3: new OpenLayers.Format.GML.v3(gmlOptionsOut),
kml: new OpenLayers.Format.KML(out_options)
}
};
}
function init(){
map = new OpenLayers.Map('map');
var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://labs.metacarta.com/wms/vmap0?", {layers: 'basic'});
vectors = new OpenLayers.Layer.Vector("Vector Layer");
map.addLayers([wms, vectors]);
map.addControl(new OpenLayers.Control.MousePosition());
map.addControl(new OpenLayers.Control.EditingToolbar(vectors));
var options = {
hover: true,
onSelect: serialize
};
var select = new OpenLayers.Control.SelectFeature(vectors, options);
map.addControl(select);
select.activate();
updateFormats();
map.setCenter(new OpenLayers.LonLat(0, 0), 1);
}
function serialize(feature) {
var type = document.getElementById("formatType").value;
// second argument for pretty printing (geojson only)
var pretty = document.getElementById("prettyPrint").checked;
var str = formats['out'][type].write(feature, pretty);
// not a good idea in general, just for this demo
str = str.replace(/,/g, ', ');
document.getElementById('output').value = str;
}
function deserialize() {
var element = document.getElementById('text');
var type = document.getElementById("formatType").value;
var features = formats['in'][type].read(element.value);
var bounds;
if(features) {
if(features.constructor != Array) {
features = [features];
}
for(var i=0; i<features.length; ++i) {
if (!bounds) {
bounds = features[i].geometry.getBounds();
} else {
bounds.extend(features[i].geometry.getBounds());
}
}
vectors.addFeatures(features);
map.zoomToExtent(bounds);
var plural = (features.length > 1) ? 's' : '';
element.value = features.length + ' feature' + plural + ' added'
} else {
element.value = 'Bad input ' + type;
}
}
// preload images
(function() {
var roots = ["draw_point", "draw_line", "draw_polygon", "pan"];
var onImages = [];
var offImages = [];
for(var i=0; i<roots.length; ++i) {
onImages[i] = new Image();
onImages[i].src = "../theme/default/img/" + roots[i] + "_on.png";
offImages[i] = new Image();
offImages[i].src = "../theme/default/img/" + roots[i] + "_on.png";
}
})();
</script>
</head>
<body onload="init()">
<div id="leftcol">
<h1 id="title">Vector Formats Example</h1>
<div id="tags">
</div>
<p id="shortdesc">
Shows the wide variety of vector formats that open layers supports.
</p>
<div id="map" class="smallmap"></div>
<div id="input">
<p>Use the drop-down below to select the input/output format
for vector features. New features can be added by using the drawing
tools above or by pasting their text representation below.</p>
<label for="formatType">Format</label>
<select name="formatType" id="formatType">
<option value="geojson" selected="selected">GeoJSON</option>
<option value="kml">KML</option>
<option value="georss">GeoRSS</option>
<option value="gml2">GML (v2)</option>
<option value="gml3">GML (v3)</option>
<option value="wkt">Well-Known Text (WKT)</option>
</select>
<label for="prettyPrint">Pretty print</label>
<input id="prettyPrint" type="checkbox"
name="prettyPrint" value="1" />
<br />
Input Projection: <select id="inproj" onchange='updateFormats()'>
<option value="EPSG:4326" selected="selected">EPSG:4326</option>
<option value="EPSG:900913">Spherical Mercator</option>
</select> <br />
Output Projection: <select id="outproj" onchange='updateFormats()'>
<option value="EPSG:4326" selected="selected">EPSG:4326</option>
<option value="EPSG:900913">Spherical Mercator</option>
</select>
<br />
<textarea id="text">paste text here...</textarea>
<br />
<input type="button" value="add feature" onclick="deserialize();" />
</div>
<div id="docs">
</div>
</div>
<div id="info">
<p>Use the tools to the left to draw new polygons, lines, and points.
After drawing some new features, hover over a feature to see the
serialized version below.</p>
<textarea id="output"></textarea>
</div>
</body>
</html>