Andreas Hocevar
319 lines
11 KiB
HTML
319 lines
11 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" type="text/css">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="./resources/prism/prism.css" type="text/css">
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<link rel="stylesheet" href="../css/ol.css" type="text/css">
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<link rel="stylesheet" href="./resources/layout.css" type="text/css">
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<script src="./resources/zeroclipboard/ZeroClipboard.min.js"></script>
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<title>Symbols with WebGL example</title>
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</head>
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<body>
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<header class="navbar" role="navigation">
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<div class="container" id="navbar-inner-container">
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<a class="navbar-brand" href="./"><img src="./resources/logo-70x70.png"> OpenLayers 3 Examples</a>
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</div>
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</header>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<h4 id="title">Symbols with WebGL example</h4>
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<p id="shortdesc">Using symbols in an atlas with WebGL.</p>
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<div id="docs"><p>When using symbol styles with WebGL, OpenLayers would render the symbol on a temporary image and would create a WebGL texture for each image. For a better performance, it is recommended to use atlas images (similar to image sprites with CSS), so that the number of textures is reduced. OpenLayers provides an <code>AtlasManager</code>, which when passed to the constructor of a symbol style, will create atlases for the symbols.</p>
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</div>
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<div id="tags">webgl, symbol, atlas, vector, point</div>
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<div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.AtlasManager.html" title="API documentation for ol.style.AtlasManager">ol.style.AtlasManager</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Fill.html" title="API documentation for ol.style.Fill">ol.style.Fill</a></li>,<li><a href="../apidoc/ol.style.RegularShape.html" title="API documentation for ol.style.RegularShape">ol.style.RegularShape</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li></ul></div>
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</div>
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</div>
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<div class="row-fluid">
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<div id="source-controls">
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<a id="copy-button"><i class="fa fa-clipboard"></i> Copy</a>
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<a id="jsfiddle-button"><i class="fa fa-jsfiddle"></i> Edit</a>
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</div>
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<form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
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<textarea class="hidden" name="js">var atlasManager = new ol.style.AtlasManager({
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// we increase the initial size so that all symbols fit into
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// a single atlas image
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initialSize: 512
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});
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var symbolInfo = [{
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opacity: 1.0,
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scale: 1.0,
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fillColor: 'rgba(255, 153, 0, 0.4)',
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strokeColor: 'rgba(255, 204, 0, 0.2)'
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}, {
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opacity: 0.75,
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scale: 1.25,
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fillColor: 'rgba(70, 80, 224, 0.4)',
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strokeColor: 'rgba(12, 21, 138, 0.2)'
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}, {
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opacity: 0.5,
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scale: 1.5,
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fillColor: 'rgba(66, 150, 79, 0.4)',
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strokeColor: 'rgba(20, 99, 32, 0.2)'
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}, {
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opacity: 1.0,
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scale: 1.0,
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fillColor: 'rgba(176, 61, 35, 0.4)',
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strokeColor: 'rgba(145, 43, 20, 0.2)'
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}];
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var radiuses = [3, 6, 9, 15, 19, 25];
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var symbolCount = symbolInfo.length * radiuses.length * 2;
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var symbols = [];
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var i, j;
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for (i = 0; i < symbolInfo.length; ++i) {
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var info = symbolInfo[i];
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for (j = 0; j < radiuses.length; ++j) {
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// circle symbol
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symbols.push(new ol.style.Circle({
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opacity: info.opacity,
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scale: info.scale,
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radius: radiuses[j],
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fill: new ol.style.Fill({
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color: info.fillColor
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}),
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stroke: new ol.style.Stroke({
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color: info.strokeColor,
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width: 1
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}),
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// by passing the atlas manager to the symbol,
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// the symbol will be added to an atlas
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atlasManager: atlasManager
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}));
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// star symbol
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symbols.push(new ol.style.RegularShape({
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points: 8,
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opacity: info.opacity,
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scale: info.scale,
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radius: radiuses[j],
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radius2: radiuses[j] * 0.7,
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angle: 1.4,
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fill: new ol.style.Fill({
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color: info.fillColor
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}),
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stroke: new ol.style.Stroke({
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color: info.strokeColor,
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width: 1
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}),
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atlasManager: atlasManager
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}));
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}
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}
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var featureCount = 50000;
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var features = new Array(featureCount);
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var feature, geometry;
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var e = 25000000;
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for (i = 0; i < featureCount; ++i) {
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geometry = new ol.geom.Point(
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[2 * e * Math.random() - e, 2 * e * Math.random() - e]);
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feature = new ol.Feature(geometry);
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feature.setStyle(
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new ol.style.Style({
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image: symbols[i % symbolCount]
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})
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);
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features[i] = feature;
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}
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var vectorSource = new ol.source.Vector({
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features: features
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});
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var vector = new ol.layer.Vector({
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source: vectorSource
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});
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// Use the "webgl" renderer by default.
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var renderer = common.getRendererFromQueryString();
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if (!renderer) {
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renderer = 'webgl';
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}
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var map = new ol.Map({
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renderer: renderer,
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layers: [vector],
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target: document.getElementById('map'),
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view: new ol.View({
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center: [0, 0],
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zoom: 4
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})
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});
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</textarea>
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<textarea class="hidden" name="css"></textarea>
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<textarea class="hidden" name="html"><div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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</textarea>
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<input type="hidden" name="wrap" value="l">
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<input type="hidden" name="resources" value="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css,https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js,http://openlayers.org/en/v3.9.0/css/ol.css,http://openlayers.org/en/v3.9.0/build/ol.js">
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</form>
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<pre><code id="example-source" class="language-markup"><!DOCTYPE html>
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<html>
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<head>
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<title>Symbols with WebGL example</title>
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<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
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<link rel="stylesheet" href="http://openlayers.org/en/v3.9.0/css/ol.css" type="text/css">
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<script src="http://openlayers.org/en/v3.9.0/build/ol.js"></script>
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</head>
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<body>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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</div>
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<script>
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var atlasManager = new ol.style.AtlasManager({
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// we increase the initial size so that all symbols fit into
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// a single atlas image
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initialSize: 512
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});
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var symbolInfo = [{
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opacity: 1.0,
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scale: 1.0,
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fillColor: 'rgba(255, 153, 0, 0.4)',
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strokeColor: 'rgba(255, 204, 0, 0.2)'
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}, {
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opacity: 0.75,
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scale: 1.25,
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fillColor: 'rgba(70, 80, 224, 0.4)',
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strokeColor: 'rgba(12, 21, 138, 0.2)'
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}, {
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opacity: 0.5,
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scale: 1.5,
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fillColor: 'rgba(66, 150, 79, 0.4)',
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strokeColor: 'rgba(20, 99, 32, 0.2)'
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}, {
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opacity: 1.0,
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scale: 1.0,
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fillColor: 'rgba(176, 61, 35, 0.4)',
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strokeColor: 'rgba(145, 43, 20, 0.2)'
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}];
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var radiuses = [3, 6, 9, 15, 19, 25];
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var symbolCount = symbolInfo.length * radiuses.length * 2;
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var symbols = [];
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var i, j;
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for (i = 0; i < symbolInfo.length; ++i) {
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var info = symbolInfo[i];
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for (j = 0; j < radiuses.length; ++j) {
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// circle symbol
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symbols.push(new ol.style.Circle({
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opacity: info.opacity,
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scale: info.scale,
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radius: radiuses[j],
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fill: new ol.style.Fill({
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color: info.fillColor
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}),
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stroke: new ol.style.Stroke({
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color: info.strokeColor,
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width: 1
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}),
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// by passing the atlas manager to the symbol,
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// the symbol will be added to an atlas
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atlasManager: atlasManager
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}));
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// star symbol
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symbols.push(new ol.style.RegularShape({
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points: 8,
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opacity: info.opacity,
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scale: info.scale,
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radius: radiuses[j],
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radius2: radiuses[j] * 0.7,
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angle: 1.4,
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fill: new ol.style.Fill({
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color: info.fillColor
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}),
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stroke: new ol.style.Stroke({
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color: info.strokeColor,
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width: 1
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}),
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atlasManager: atlasManager
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}));
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}
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}
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var featureCount = 50000;
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var features = new Array(featureCount);
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var feature, geometry;
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var e = 25000000;
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for (i = 0; i < featureCount; ++i) {
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geometry = new ol.geom.Point(
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[2 * e * Math.random() - e, 2 * e * Math.random() - e]);
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feature = new ol.Feature(geometry);
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feature.setStyle(
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new ol.style.Style({
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image: symbols[i % symbolCount]
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})
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);
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features[i] = feature;
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}
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var vectorSource = new ol.source.Vector({
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features: features
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});
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var vector = new ol.layer.Vector({
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source: vectorSource
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});
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// Use the "webgl" renderer by default.
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var renderer = common.getRendererFromQueryString();
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if (!renderer) {
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renderer = 'webgl';
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}
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var map = new ol.Map({
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renderer: renderer,
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layers: [vector],
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target: document.getElementById('map'),
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view: new ol.View({
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center: [0, 0],
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zoom: 4
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})
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});
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</script>
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</body>
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</html></code></pre>
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</div>
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</div>
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<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
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<script src="./resources/common.js"></script>
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<script src="./resources/prism/prism.min.js"></script>
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<script src="loader.js?id=symbol-atlas-webgl"></script>
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</body>
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</html>
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