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Rendering 110m world TopoJSON

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Tim Schaub
2013-06-28 17:28:07 -06:00
parent a0fd3eec19
commit f677eb8c50
3 changed files with 129 additions and 0 deletions
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examples/data/topojson/world-110m.json Normal file
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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="../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>TopoJSON Example</title>
</head>
<body>
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<a class="brand" href="./">OpenLayers 3 Examples</a>
<ul class="nav pull-right">
<li><iframe class="github-watch-button" src="http://ghbtns.com/github-btn.html?user=openlayers&repo=ol3&type=watch&count=true"
allowtransparency="true" frameborder="0" scrolling="0" height="20" width="90"></iframe></li>
<li><a href="https://twitter.com/share" class="twitter-share-button" data-count="none" data-hashtags="openlayers">&nbsp;</a></li>
<li><div class="g-plusone-wrapper"><div class="g-plusone" data-size="medium" data-annotation="none"></div></div></li>
</ul>
</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="span8">
<h4 id="title">TopoJSON example</h4>
<p id="shortdesc">Demonstrates rendering of features from a TopoJSON topology.</p>
<div id="docs">
<p>See the <a href="topojson.js" target="_blank">topojson.js source</a> to see how this is done.</p>
</div>
<div id="tags">vector, topojson, style</div>
</div>
<div id="info" class="span4">&nbsp;</div>
</div>
</div>
<script src="loader.js?id=topojson" type="text/javascript"></script>
<script src="../resources/social-links.js" type="text/javascript"></script>
</body>
</html>

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examples/topojson.js Normal file
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goog.require('ol.Map');
goog.require('ol.RendererHint');
goog.require('ol.View2D');
goog.require('ol.layer.TileLayer');
goog.require('ol.layer.Vector');
goog.require('ol.parser.TopoJSON');
goog.require('ol.proj');
goog.require('ol.source.MapQuestOpenAerial');
goog.require('ol.source.Vector');
goog.require('ol.style.Polygon');
goog.require('ol.style.Rule');
goog.require('ol.style.Style');
var raster = new ol.layer.TileLayer({
source: new ol.source.MapQuestOpenAerial()
});
var vector = new ol.layer.Vector({
source: new ol.source.Vector({
projection: ol.proj.get('EPSG:4326')
}),
style: new ol.style.Style({rules: [
new ol.style.Rule({
symbolizers: [
new ol.style.Polygon({
strokeColor: '#bada55',
strokeWidth: 2,
opacity: 0.75
})
]
})
]})
});
var map = new ol.Map({
layers: [raster, vector],
renderer: ol.RendererHint.CANVAS,
target: 'map',
view: new ol.View2D({
center: [0, 0],
zoom: 1
})
});
map.on(['click', 'mousemove'], function(evt) {
map.getFeatureInfo({
pixel: evt.getPixel(),
layers: [vector],
success: function(featureInfo) {
document.getElementById('info').innerHTML = featureInfo[0];
}
});
});
var parser = new ol.parser.TopoJSON();
var url = 'data/topojson/world-110m.json';
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
/**
* onload handler for the XHR request.
*/
xhr.onload = function() {
if (xhr.status == 200) {
var projection = map.getView().getProjection();
vector.parseFeatures(xhr.responseText, parser, projection);
}
};
xhr.send();