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add an Extend Cluster Strategy example, provided by Marc Jansen, no functional change to the library, r=me (closes #2865)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@10811 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
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Éric Lemoine
2010-10-07 08:29:06 +00:00
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examples/strategy-cluster-extended.html
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<!DOCTYPE html>
<html>
<head>
<title>Extended clustering example</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
label {
cursor: pointer
}
#wrap {
width: 925px;
margin: 10px;
}
#strategy-chooser, #generalinfo, #info {
width: 400px;
padding: 0;
float: right;
clear: right;
margin-bottom: 4px;
}
#map {
float: left;
}
</style>
</head>
<body>
<h1 id="title">Extended clustering</h1>
<div id="tags">
cluster, advanced
</div>
<p id="shortdesc">
Shows the usage of custom classes for a fine grained control about
the clustering behaviour.
</p>
<div id="wrap">
<div id="map" class="smallmap">
</div>
<div id="strategy-chooser">
<p>
Select the desired clustering strategy:
</p>
<label>
<input type="radio" name="strategy" value="none" id="no-strategy" checked="checked">No strategy
</label>
<br/>
<label>
<input type="radio" name="strategy" value="cluster" id="cluster-strategy">Simple cluster-strategy
</label>
<br/>
<label>
<input type="radio" name="strategy" value="attribute-cluster" id="attributive-cluster-strategy">Attributive cluster-strategy
</label>
<br/>
<label>
<input type="radio" name="strategy" value="rule-cluster" id="rulebased-cluster-strategy">Rulebased cluster-strategy
</label>
</div>
<div id="generalinfo">
</div>
<div id="info">
</div>
</div>
<div id="docs" style="clear: both; padding-top: 10px">
<p>
The vectorlayer in this example contains random data with an
attribute "clazz" that can take the values 1, 2, 3 and 4. The
features with clazz = 4 are considered more important than the
others.
</p>
<p>
The radiobuttons on the right of the map control the
cluster strategy to be applied to the features.
</p>
<ul>
<li>
<strong>No strategy</strong>
means that all features are
rendered, no clustering shall be applied
</li>
<li>
<strong>Simple cluster-strategy</strong>
applies the cluster
strategy with default options to the layer. You should notice
that many of the important features with clazz = 4 are getting
lost, since clustering happens regardless of feature attributes
</li>
<li>
<strong>Attributive cluster-strategy</strong>
uses a
customized cluster strategy. This strategy is configured to
cluster features of the same clazz only. You should be able to see all
red points (clazz = 4) even though the data is clustered. A
cluster now contains only features of the same clazz.
</li>
<li>
<strong>Rulebased cluster-strategy</strong>
uses another
customized cluster strategy. This strategy is configured to
cluster features that follow a certain rule only. In this case only
features with a clazz different from 4 are considered as
candidates for clustering. That means that usually you have fewer
clusters on the map, yet all with clazz = 4 are easily
distinguishable
</li>
</ul>
<p>
Hover over the features to get a short infomation about the
feature or cluster of features.
</p>
</div>
<p>
View the <a href="strategy-cluster-extended.js" target="_blank">strategy-cluster-extended.js</a>
source to see how this is done.
</p>
<script type="text/javascript" src="../lib/OpenLayers.js"></script>
<script type="text/javascript" src="strategy-cluster-extended.js"></script>
</body>
</html>