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Add EPSG:4326 example

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This commit is contained in:
Tom Payne
2013-02-21 20:22:46 +01:00
parent 17bd715495
commit f6575f3195
2 changed files with 103 additions and 0 deletions
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examples/epsg-4326.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
html, body, #map {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
}
#text {
position: absolute;
top: 8px;
right: 8px;
z-index: 20000;
background-color: white;
padding: 0 0.5em 0.5em 0.5em;
border-radius: 4px;
}
@media only screen and (max-width: 600px) {
#text {
display: none;
}
}
</style>
<title>EPSG:4326 example</title>
</head>
<body>
<div id="map">
<div id="text">
<h1 id="title">EPSG:4326 example</h1>
<div id="shortdesc">Example of a epsg-4326 map.</div>
<div id="docs">
<p>See the
<a href="epsg-4326.js" target="_blank">epsg-4326.js source</a>
to see how this is done.</p>
</div>
</div>
</div>
<div id="tags">epsg4326</div>
<script src="loader.js?id=epsg-4326" type="text/javascript"></script>
</body>
</html>
examples/epsg-4326.js
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goog.require('goog.debug.Console');
goog.require('goog.debug.Logger');
goog.require('goog.debug.Logger.Level');
goog.require('ol.Collection');
goog.require('ol.Coordinate');
goog.require('ol.Map');
goog.require('ol.Projection');
goog.require('ol.RendererHint');
goog.require('ol.View2D');
goog.require('ol.layer.TileLayer');
goog.require('ol.source.TiledWMS');
if (goog.DEBUG) {
goog.debug.Console.autoInstall();
goog.debug.Logger.getLogger('ol').setLevel(goog.debug.Logger.Level.INFO);
}
var epsg4326 = ol.Projection.getFromCode('EPSG:4326');
// We give the single image source a set of resolutions. This prevents the
// source from requesting images of arbitrary resolutions.
var projectionExtent = epsg4326.getExtent();
var maxResolution = Math.max(
projectionExtent.maxX - projectionExtent.minX,
projectionExtent.maxY - projectionExtent.minY) / 256;
var resolutions = new Array(10);
for (var i = 0; i < 10; ++i) {
resolutions[i] = maxResolution / Math.pow(2.0, i);
}
var layers = new ol.Collection([
new ol.layer.TileLayer({
source: new ol.source.TiledWMS({
url: 'http://vmap0.tiles.osgeo.org/wms/vmap0',
crossOrigin: null,
params: {
'LAYERS': 'basic',
'FORMAT': 'image/jpeg'
},
projection: epsg4326
})
})
]);
var map = new ol.Map({
layers: layers,
// The OSgeo server does not set cross origin headers, so we cannot use WebGL
renderers: [ol.RendererHint.CANVAS, ol.RendererHint.DOM],
target: 'map',
view: new ol.View2D({
projection: epsg4326,
center: new ol.Coordinate(0, 0),
zoom: 2
})
});