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Example demonstrating limited layer extent

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Tim Schaub
2014-11-11 09:00:20 -08:00
parent 50c0bc6879
commit 3685626187
2 changed files with 118 additions and 0 deletions
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<!doctype html>
<html lang="en">
<head>
<meta 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="../css/ol.css" type="text/css">
<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap.min.css" type="text/css">
<link rel="stylesheet" href="../resources/layout.css" type="text/css">
<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
<title>Limited Layer Extent</title>
</head>
<body>
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<a class="brand" href="./"><img src="../resources/logo.png"> OpenLayers 3 Examples</a>
</div>
</div>
</div>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
</div>
</div>
<div class="row-fluid">
<div class="span12">
<h4 id="title">Limited layer extent</h4>
<p id="shortdesc">Restricting layer rendering to a limited extent.</p>
<div id="docs">
<p>
This example uses the <code>layer.setExtent()</code> method to
modify the extent of the overlay layer. Use the controls below
to limit rendering based on an extent.
</p>
<p>
<div class="btn-group">
<button type="button" class="btn btn-default" id="northwest">northwest</button>
<button type="button" class="btn btn-default" id="northeast">northeast</button>
<button type="button" class="btn btn-default" id="southeast">southeast</button>
<button type="button" class="btn btn-default" id="southwest">southwest</button>
<button type="button" class="btn btn-default" id="world">world</button>
</div>
</p>
<p>
See the <a href="layer-extent.js" target="_blank">layer-extent.js
source</a> for details on how this is done.
</p>
</div>
<div id="tags">extent, tilejson</div>
</div>
</div>
</div>
<script src="../resources/jquery.min.js" type="text/javascript"></script>
<script src="../resources/example-behaviour.js" type="text/javascript"></script>
<script src="loader.js?id=layer-extent" type="text/javascript"></script>
</body>
</html>

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examples/layer-extent.js Normal file
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goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.layer.Tile');
goog.require('ol.proj');
goog.require('ol.source.TileJSON');
function transform(extent) {
return ol.proj.transformExtent(extent, 'EPSG:4326', 'EPSG:3857');
}
var extents = {
northwest: transform([-180, 0, 0, 85]),
northeast: transform([0, 0, 180, 85]),
southeast: transform([0, -85, 180, 0]),
southwest: transform([-180, -85, 0, 0]),
world: transform([-180, -85, 180, 85])
};
var base = new ol.layer.Tile({
source: new ol.source.TileJSON({
url: 'http://api.tiles.mapbox.com/v3/' +
'mapbox.world-black.jsonp',
crossOrigin: 'anonymous'
})
});
var overlay = new ol.layer.Tile({
extent: extents.northwest,
source: new ol.source.TileJSON({
url: 'http://api.tiles.mapbox.com/v3/' +
'mapbox.world-glass.jsonp',
crossOrigin: 'anonymous'
})
});
var map = new ol.Map({
layers: [base, overlay],
renderer: exampleNS.getRendererFromQueryString(),
target: 'map',
view: new ol.View({
center: [0, 0],
zoom: 1
})
});
for (var key in extents) {
document.getElementById(key).onclick = function(event) {
overlay.setExtent(extents[event.target.id]);
};
}