195 lines
7.6 KiB
Groff
195 lines
7.6 KiB
Groff
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<title>/* @pjs pauseOnBlur */ directive | reference | Processing.js</title>
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<link rel="stylesheet" href="../css/bootstrap.css" type="text/css" />
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<body>
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<div class="container">
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<div class="header">
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<a href="http://processingjs.org/"><img src="../images/header.png" width="177" height="42"></a>
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</div>
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<span class="tagline">a port of the Processing Visualization Language</span>
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<div class="navbar">
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<canvas width="940px" height="78px" data-processing-sources="/sketches/bannerSketch.pde"></canvas>
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<li><a href="http://processingjs.org/"><span>home</span></a></li>
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<li><a href="http://processingjs.org/exhibition/"><span>exhibition</span></a></li>
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<a class="viewsource" href="http://processingjs.org/sketches/bannerSketch.pde">view source</a>
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</div>
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<div class="page row">
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<div class="span11">
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>/* @pjs pauseOnBlur */ directive</h3></td>
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</tr>
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<tr class="">
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<th scope="row">Examples</th>
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<td><div class="example"><pre>/* @pjs pauseOnBlur="true"; */
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void setup()
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{
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size(200,200);
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background(255);
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frameRate(45);
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}
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float value = 0;
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boolean forward = true;
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/**
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* This animation draws a sinewave, but only when the page this sketch
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* is loaded on has focus. If the user alt-tabs to some other program,
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* or they look at a different browser instance or tab, this sketch will
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* be paused until the page it is loaded on regains focus.
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*/
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void draw()
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{
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value += forward ? 2*PI/25 : -2*PI/25;
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if (forward && value>=2*PI) { forward=false; }
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else if(!forward && value<=0) { forward=true; }
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noStroke();
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fill(255,75);
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rect(0,0,width,height);
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stroke(100,100,200);
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noFill();
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float c = value - PI;
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bezier(0,100, 33,100+(50*c*PI/6), 66,100+(50*c*PI/6), 100,100);
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bezier(100,100, 133,100+(50*-c*PI/6), 166,100+(50*-c*PI/6), 200,100);
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}
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</pre></div></td>
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</tr>
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<tr class="">
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<th scope="row">Description</th>
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<td><p>Animated sketches that are loaded with Processing.js will always be running, irrespective of whether the user is looking at the page that the
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sketch is running on. Using this directive makes an animated sketch pause when the user is not looking at the page that the sketch is loaded on, to
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free up resources. The sketch is resumed only when the user focusses on the page again.</p>
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</td>
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</tr>
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<tr class="">
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<th scope="row">Syntax</th>
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<td>
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<pre>
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<kbd> /* @pjs pauseOnBlur="true"; */</kbd>
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</td>
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</tr>
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<tr class="">
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<th scope="row">Parameters</th>
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<td><table cellpadding="0" cellspacing="0" border="0">
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<tr class="">
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<th scope="row">pauseOnBlur</th>
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<td>"true" (implicitly false for any other value)</td>
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</tr>
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</table></td>
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</tr>
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<tr class="">
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<th scope="row">Usage</th>
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<td>Web & Application, Processing.js compatibility</td>
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</tr>
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<tr class="">
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<th scope="row">Related</th>
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<td>
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<a href="http://processingjs.org/reference/pjs directive">@pjs directives</a>
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</td>
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</tr>
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</table>
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<div class="cclicense">
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<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
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<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/2.0/">
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<img alt="Creative Commons License" border="0" src="../images/somerights20.gif" />
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</a>
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</div>
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<div class="sidebar span4">
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<h3><a href="http://processingjs.org/download/">Downloads</a></h3>
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<ul>
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<li><a href="http://processingjs.org/download/">Download the latest version of Processing.js!</a></li>
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</ul>
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<h3><a href="http://processingjs.org/articles/">Articles</a></h3>
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<ul>
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<li><a href="http://processingjs.org/articles/jsQuickStart.html">Quick Start - JavaScript Developer</a></li>
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<li><a href="http://processingjs.org/articles/p5QuickStart.html">Quick Start - Processing Developer</a></li>
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<li><a href="http://processingjs.org/articles/RenderingModes.html">Rendering Modes</a></li>
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<li><a href="http://processingjs.org/articles/PomaxGuide.html">Pomax's Guide to processing-js</a></li>
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</ul>
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<h3><a>Web IDEs</a></h3>
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<ul>
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<li><a href="http://sketchpad.cc">Sketchpad.cc</a></li>
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<li><a href="http://processingjs.org/tools/processing-helper.html">Processing.js Helper</a></li>
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<li><a href="http://www.openprocessing.org">OpenProcessing.org</a></li>
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</ul>
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<h3><a href="http://processingjs.org/community/">Community</a></h3>
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<ul>
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<li><a href="irc://irc.mozilla.org/processing.js">IRC Channel</a></li>
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<li><a href="http://processing-js.lighthouseapp.com/">Bug Tracker</a></li>
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<li><a href="http://github.com/processing-js/processing-js/">Github Repository</a></li>
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<li><a href="http://groups.google.com/group/processingjs">Google Group</a></li>
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<li><a href="http://zenit.senecac.on.ca/wiki/index.php/">Open Source @ Seneca</a></li>
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</ul>
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<h3><a href="http://twitter.com/processingjs">Twitter Feed</a></h3>
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<div class="twitter"></div>
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</div>
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</div>
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<div class="footer">
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Processing is an open visualization language developed by
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<a href="http://benfry.com/">Ben Fry</a> & <a href="http://reas.com/">Casey Reas</a>,
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and originally ported to Javascript by
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<a href="http://ejohn.org/blog/processingjs/">John Resig</a>.
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Processing.js is maintained by the Processing.js team.
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</div>
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</div>
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<a href="http://github.com/processing-js/processing-js/">
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<img style="position: absolute; top: 0; right: 0; border: 0;" src="../images/forkme-right-orange.png" alt="Fork me on GitHub">
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