Added an example that shows how to use the popular Proj4JS library.
This commit is contained in:
Marc Jansen
92
examples/using-proj4js.html
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92
examples/using-proj4js.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<title>Using Proj4JS for vector reprojection</title>
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<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
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<link rel="stylesheet" href="style.css" type="text/css">
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<script type="text/javascript" src="http://trac.osgeo.org/proj4js/export/2080/trunk/lib/proj4js-compressed.js"></script>
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<script type="text/javascript" src="http://spatialreference.org/ref/epsg/31467/proj4js/"></script>
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<script type="text/javascript" src="../lib/OpenLayers.js"></script>
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<script type="text/javascript" src="./using-proj4js.js"></script>
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<style type="text/css">
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ul {
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width: 300px;
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float: left;
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}
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ul li {
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list-style: none;
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margin-bottom: .5em;
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}
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input {
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width: 250px;
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}
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#shortdesc {
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margin-bottom: .5em;
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}
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#map {
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width: 256px;
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height: 256px;
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float: left;
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margin-right: .2em;
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}
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#attribution,
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#mouse-position-31467,
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#mouse-position-4326 {
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float: left;
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clear: left;
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font-size: smaller;
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color: #444;
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}
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.olControlMousePosition {
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background-color: #ededed;
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background-color: rgba(200,200,200, 0.7);
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}
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</style>
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</head>
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<body onload="init();">
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<h1 id="title">Using Proj4JS for vector reprojection</h1>
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<div id="tags">
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projection, proj, proj4js, reprojection, reproject,
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transform, transformation
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</div>
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<p id="shortdesc">
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The features are reprojected with the JavaScript library
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<a href="http://proj4js.org/">Proj4JS</a>.
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</p>
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<div id="map">
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</div>
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<ul>
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<li>
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<input type="button" value="Add Cologne (~ 6.97, 50.95)"
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onclick="addVector(6.966667, 50.95, this);">
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</li>
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<li>
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<input type="button" value="Add Berlin (~ 13.40, 52.50)"
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onclick="addVector(13.398889, 52.500556, this);">
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</li>
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<li>
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<input type="button" value="Add Hamburg (~ 10.00, 53.57)"
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onclick="addVector(10.001389, 53.565278, this);">
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</li>
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<li>
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<input type="button" value="Add Munich (~ 11.57, 48.13)"
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onclick="addVector(11.566667, 48.133333, this);">
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</li>
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<li>
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<input type="button" value="Add country outline (polygon)"
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onclick="addOutline(this);">
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</li>
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<li>
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<div id="status">
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</div>
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</li>
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</ul>
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<div id="attribution"></div>
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<div id="mouse-position-4326"></div>
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<div id="mouse-position-31467"></div>
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</body>
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</html>
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115
examples/using-proj4js.js
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115
examples/using-proj4js.js
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var map, vector;
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function init(){
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map = new OpenLayers.Map('map', {
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projection: 'EPSG:31467',
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maxResolution: 3457.03125,
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units: 'm',
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numZoomLevels: 1,
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controls: [
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new OpenLayers.Control.Attribution({
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div: $('attribution')
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}),
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new OpenLayers.Control.MousePosition({
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div: $('mouse-position-31467'),
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prefix: 'Coordinates: ',
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suffix: ' (in <a href="http://spatialreference.org/ref/epsg/'
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+ '31467/">EPSG:31467</a>)'
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}),
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new OpenLayers.Control.MousePosition({
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div: $('mouse-position-4326'),
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displayProjection: new OpenLayers.Projection('EPSG:4326'),
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prefix: 'Coordinates: ',
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suffix: ' (in <a href="http://spatialreference.org/ref/epsg/'
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+ '4326/">EPSG:4326</a>)'
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})
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],
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maxExtent: new OpenLayers.Bounds(3146150, 5223600, 4031150, 6108600)
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});
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var germany_gk3 = new OpenLayers.Layer.WMS(
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'Germany (Metaspatial)',
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'http://www.metaspatial.net/cgi-bin/germany-wms',
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{
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layers: 'germany'
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},
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{
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singleTile: true,
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ratio: 1.0,
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attribution: 'Background WMS offered withoud restrictions by '
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+ '<a href="http://www.metaspatial.net/">MetaSpatial</a>'
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}
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);
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vector = new OpenLayers.Layer.Vector();
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map.addLayers( [ germany_gk3, vector ] );
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map.zoomToMaxExtent();
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}
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function addVector(x, y, btn){
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var status = "Transformed ",
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geometry = new OpenLayers.Geometry.Point(x, y);
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status += '<br /><code style="font-weight: bold"> '
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+ geometry.toString() + '</code> to';
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geometry.transform(
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new OpenLayers.Projection('EPSG:4326'),
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new OpenLayers.Projection('EPSG:31467')
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);
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status += '<br /><code style="font-weight: bold"> '
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+ geometry.toString() + '</code>.';
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$('status').innerHTML = status;
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var feature = new OpenLayers.Feature.Vector(geometry, {}, {
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strokeColor: '#333333',
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strokeOpacity: 1,
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strokeWidth: 2,
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fillColor: '#9966cc',
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fillOpacity: 0.9,
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pointRadius: 12,
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graphicName: 'star'
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});
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vector.addFeatures([feature]);
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btn.disabled = true;
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}
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function addOutline(btn) {
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var wkt = 'POLYGON(('
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+ ' 9.921906 54.983104, 9.939580 54.596642,'
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+ '10.950112 54.363607,10.939467 54.008693,11.956252 54.196486,'
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+ '12.518440 54.470371,13.647467 54.075511,14.119686 53.757029,'
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+ '14.353315 53.248171,14.074521 52.981263,14.437600 52.624850,'
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+ '14.685026 52.089947,14.607098 51.745188,15.016996 51.106674,'
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+ '14.570718 51.002339,14.307013 51.117268,14.056228 50.926918,'
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+ '13.338132 50.733234,12.966837 50.484076,12.240111 50.266338,'
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+ '12.415191 49.969121,12.521024 49.547415,13.031329 49.307068,'
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+ '13.595946 48.877172,13.243357 48.416115,12.884103 48.289146,'
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+ '13.025851 47.637584,12.932627 47.467646,12.620760 47.672388,'
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+ '12.141357 47.703083,11.426414 47.523766,10.544504 47.566399,'
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+ '10.402084 47.302488, 9.896068 47.580197, 9.594226 47.525058,'
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+ ' 8.522612 47.830828, 8.317301 47.613580, 7.466759 47.620582,'
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+ ' 7.593676 48.333019, 8.099279 49.017784, 6.658230 49.201958,'
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+ ' 6.186320 49.463803, 6.242751 49.902226, 6.043073 50.128052,'
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+ ' 6.156658 50.803721, 5.988658 51.851616, 6.589397 51.852029,'
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+ ' 6.842870 52.228440, 7.092053 53.144043, 6.905140 53.482162,'
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+ ' 7.100425 53.693932, 7.936239 53.748296, 8.121706 53.527792,'
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+ ' 8.800734 54.020786, 8.572118 54.395646, 8.526229 54.962744,'
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+ ' 9.282049 54.830865, 9.921906 54.983104))',
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feature = new OpenLayers.Format.WKT().read(wkt),
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geometry = feature.geometry.transform(
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new OpenLayers.Projection('EPSG:4326'),
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new OpenLayers.Projection('EPSG:31467')
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),
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style = {
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strokeColor: '#9966cc',
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strokeOpacity: 1,
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strokeWidth: 5,
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fillColor: '#ffffff',
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fill: false
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},
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transformedFeature = new OpenLayers.Feature.Vector(geometry, {}, style);
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vector.addFeatures([transformedFeature]);
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$('status').innerHTML = 'Transformed polygon';
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btn.disabled = true;
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}
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