191 lines
8.2 KiB
HTML
191 lines
8.2 KiB
HTML
<!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 preload */ 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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<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 preload */ 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 preload="myimage.jpg"; */
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void setup()
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{
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size(200,200);
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noLoop();
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}
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void draw()
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{
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background(255);
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PImage im = loadImage("myimage.jpg");
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image(im, 50,50, 100,100);
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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>This directive regulates image preloading, which is required when using <a href="../loadImage_.1">loadImage()</a> or <a href="../requestImage_.1">requestImage()</a> in a sketch.
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Using this directive will preload all images indicated between quotes, and comma separated if multiple images are used, so that they will be ready
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for use when the sketch begins running. As resources are loaded via the AJAX approach, not using this directive will result in the sketch loading
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an image, and then immediately trying to use this image in some way, even though the browser has not finished downloading and caching it. Images
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can be preloaded from URL, such as "image1.jpg". While
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all browser-supported image formats are supported by processing.js, it is best to stick to "gif", "jpg" and "png" formats if you intend your
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sketch to be cross-platform compatible with native Processing. </p>
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<p><b>NOTE:</b> remote images can be drawn, but their pixels cannot be manipulated due to browser security restrictions. </p>
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<p><b>NOTE:</b> this directive is for images only. For preloading fonts, use the <a href="../font.1">font</a> directive listed below.</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 preload="imageURL"; */</kbd> <br/>
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<kbd> /* @pjs preload="data:image/imagetype,base64, {base 64 encoded data block}"; */</kbd>
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</td>
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</tr>
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<tr class="">
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<th scope="row">Syntax for multiple images</th>
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<td>
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<pre>
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<kbd> /* @pjs preload="image1,image2,..."; */</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">preload</th>
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<td>comma separated list of URLs or data-URIs (may be mixed), all inside a single set of double quotes</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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<br /><a href="../loadImage_.1">loadImage()</a>
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<br /><a href="../requestImage_.1">requestImage()</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>
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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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</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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