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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Proj4js</title>
<style type="text/css">
@import url(test/base.css);
#descSource, #descDest {
font-style: italic;
color: #999;
}
#xySource, #xyDest {
width: 100%;
}
</style>
<script src="lib/proj4js.js"></script>
<script src="lib/defs/EPSG27200.js"></script>
<script src="lib/defs/EPSG4272.js"></script>
<script src="lib/defs/EPSG54009.js"></script>
<script src="lib/defs/EPSG42304.js"></script>
<script src="lib/defs/EPSG25833.js"></script>
<script src="lib/defs/EPSG27563.js"></script>
<script src="lib/defs/EPSG4139.js"></script>
<script src="lib/defs/EPSG4302.js"></script>
<script src="lib/defs/EPSG31285.js"></script>
<script src="lib/defs/EPSG900913.js"></script>
<script type="text/javascript">
var projHash = {};
function initProj4js() {
var crsSource = document.getElementById('crsSource');
var crsDest = document.getElementById('crsDest');
var optIndex = 0;
for (var def in Proj4js.defs) {
projHash[def] = new Proj4js.Proj(def); //create a Proj for each definition
var label = def+" - "+ (projHash[def].title ? projHash[def].title : '');
var opt = new Option(label, def);
crsSource.options[optIndex]= opt;
var opt = new Option(label, def);
crsDest.options[optIndex]= opt;
++optIndex;
} // for
updateCrs('Source');
updateCrs('Dest');
}
function updateCrs(id) {
var crs = document.getElementById('crs'+id);
if (crs.value) {
var proj = projHash[crs.value];
var str = 'projection: ' + proj.projName + ' - datum: ' + proj.datumName;
var desc = document.getElementById('desc'+id);
desc.innerHTML = str;
var units = document.getElementById('units'+id);
units.innerHTML = proj.units;
}
}
function transform() {
var crsSource = document.getElementById('crsSource');
var projSource = null;
if (crsSource.value) {
projSource = projHash[crsSource.value];
} else {
alert("Select a source coordinate system");
return;
}
var crsDest = document.getElementById('crsDest');
var projDest = null;
if (crsDest.value) {
projDest = projHash[crsDest.value];
} else {
alert("Select a destination coordinate system");
return;
}
var pointInput = document.getElementById('xySource');
if (pointInput.value) {
var pointSource = new Proj4js.Point(pointInput.value);
var pointDest = Proj4js.transform(projSource, projDest, pointSource);
document.getElementById('xyDest').value = pointDest.toShortString();
} else {
alert("Enter source coordinates");
return;
}
}
</script>
</head>
<body onload="initProj4js()">
<div id="header">
<h1>Proj4js Home Page</h1>
</div>
<div id="navbar">
<a href="http://trac.osgeo.org/proj4js">Proj4js Wiki/Trac</a> |
<a href="http://wiki.osgeo.org/wiki/MetaCRS">OSGeo MetaCRS</a> |
<a href="http://spatialreference.org/">spatialreference.org</a> |
<a href="http://communitymapbuilder.org/">MapBuilder</a> |
<a href="http://openlayers.org/">OpenLayers</a> |
</div>
<h1>Welcome to Proj4js</h1>
<p>
This is a JavaScript library that provides methods for coordinate
transformations between map projections and longitude/latitude,
including datum transformations, in a web client.
</p>
<p>
To use the Proj4js, you first create a source and destination Proj4js.Proj
objects, passing in a projection code (e.g. EPSG:4326).
You can then use the Proj4js.transform() method, passing in map XY as a point
object and the source and destination projection objects,
and it returns the point coordinate in the destination projection.
</p>
<form>
<table>
<tbody>
<tr>
<th colspan="3">source</th>
<th></th>
<th colspan="3">dest</th>
</tr>
<tr>
<td>CRS:</td>
<td colspan="2">
<select name="crsSource" id="crsSource" onchange="updateCrs('Source')">
<option value selected="selected">Select a CRS</option>
</select>
</td>
<td></td>
<td>CRS:</td>
<td colspan="2">
<select name="crsDest" id="crsDest" onchange="updateCrs('Dest')">
<option value selected="selected">Select a CRS</option>
</select>
</td>
</tr>
<tr>
<td></td>
<td colspan="2" id="descSource">Projection - datum</td>
<td></td>
<td></td>
<td colspan="2" id="descDest">Projection - datum</td>
</tr>
<tr>
<td>x,y</td>
<td><input name="xySource" id="xySource" type="text"/></td>
<td id="unitsSource">units</td>
<td><input type="button" value="--> transform -->" onclick="transform();"/></td>
<td>x,y</td>
<td><input name="xyDest" id="xyDest" type="text"></td>
<td id="unitsDest">units</td>
</tr>
<tr>
<td colspan="7" align="center"><input type="reset" value="reset"/></td>
</tr>
</tbody>
</table>
</form>
<p>
For more information on Proj4js and to report bugs, please visit the
<a href="http://trac.osgeo.org/proj4js">Proj4js Trac and Wiki</a> at OSGeo.
</p>
</body>
</html>
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