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Add an icon sprite webgl example

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Éric Lemoine
2014-10-31 11:17:24 +01:00
parent 9201312737
commit f332cdacf1
3 changed files with 112 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>Icon sprites with WebGL example</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">Icon sprite with WebGL example</h4>
<p id="shortdesc">Icon sprite with WebGL.</p>
<div id="docs">
<p>See the <a href="icon-sprite-webgl.js" target="_blank">icon-sprite-webgl.js source</a> to see how this is done.</p>
</div>
<div id="tags">webgl, icon, sprite, vector, point</div>
</div>
</div>
</div>
<script src="../resources/jquery.min.js" type="text/javascript"></script>
<script src="../resources/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
<script src="../resources/example-behaviour.js" type="text/javascript"></script>
<script src="loader.js?id=icon-sprite-webgl" type="text/javascript"></script>
</body>
</html>

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examples/icon-sprite-webgl.js Normal file
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goog.require('ol.Feature');
goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.geom.Point');
goog.require('ol.layer.Vector');
goog.require('ol.source.Vector');
goog.require('ol.style.Icon');
goog.require('ol.style.Style');
var iconInfo = [
{size: [55, 55], offset: [0, 0]},
{size: [55, 55], offset: [110, 86]},
{size: [55, 86], offset: [55, 0]}
];
var i;
var iconCount = iconInfo.length;
var icons = new Array(iconCount);
for (i = 0; i < iconCount; ++i) {
icons[i] = new ol.style.Icon({
src: 'data/Butterfly.png',
size: iconInfo[i].size,
offset: iconInfo[i].offset
});
}
var featureCount = 10000;
var features = new Array(featureCount);
var feature, geometry;
var e = 25000000;
for (i = 0; i < featureCount; ++i) {
geometry = new ol.geom.Point(
[2 * e * Math.random() - e, 2 * e * Math.random() - e]);
feature = new ol.Feature(geometry);
feature.setStyle(
new ol.style.Style({
image: icons[i % iconCount]
})
);
features[i] = feature;
}
var vectorSource = new ol.source.Vector({
features: features
});
var vector = new ol.layer.Vector({
source: vectorSource
});
var map = new ol.Map({
renderer: 'webgl',
layers: [vector],
target: document.getElementById('map'),
view: new ol.View({
center: [0, 0],
zoom: 5
})
});