306 lines
8.5 KiB
Groff
306 lines
8.5 KiB
Groff
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
|
|
<title>background() | reference | Processing.js</title>
|
|
<link rel="stylesheet" href="../css/bootstrap.css" type="text/css" />
|
|
<link rel="stylesheet" href="../css/syntax.css" type="text/css" />
|
|
<link rel="stylesheet" href="../css/processing-js.css" type="text/css" />
|
|
<script src="../js/processing.min.js" type="text/javascript"></script>
|
|
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js" type="text/javascript"></script>
|
|
<script src="../js/jquery.tweet.min.js" type="text/javascript"></script>
|
|
<script src="../js/tabselector.js" type="text/javascript"></script>
|
|
<script src="http://cdn.webglstats.com/stat.js" defer="defer" async="async"></script>
|
|
<script type="text/javascript">
|
|
// Only do tracking on the actual site
|
|
if (document.location.host === "processingjs.org") {
|
|
var _gaq = _gaq || [];
|
|
_gaq.push(['_setAccount', 'UA-8565070-1']);
|
|
_gaq.push(['_trackPageview']);
|
|
(function() {
|
|
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
|
|
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
|
|
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
|
|
}());
|
|
}
|
|
</script>
|
|
</head>
|
|
<body>
|
|
<div class="container">
|
|
<div class="header">
|
|
<a href="http://processingjs.org/"><img src="../images/header.png" width="177" height="42"></a>
|
|
</div>
|
|
<span class="tagline">a port of the Processing Visualization Language</span>
|
|
|
|
<div class="navbar">
|
|
<canvas width="940px" height="78px" data-processing-sources="/sketches/bannerSketch.pde"></canvas>
|
|
<ul>
|
|
<li><a href="http://processingjs.org/"><span>home</span></a></li>
|
|
<li><a href="http://processingjs.org/download/"><span>download</span></a></li>
|
|
<li><a href="index.html"><span>reference</span></a></li>
|
|
<li><a href="http://processingjs.org/exhibition/"><span>exhibition</span></a></li>
|
|
<li><a href="http://processingjs.org/learning/"><span>learning</span></a></li>
|
|
<li><a href="http://processingjs.org/articles/"><span>articles</span></a></li>
|
|
<li><a href="http://processingjs.org/community/"><span>community</span></a></li>
|
|
<li><a href="http://processingjs.org/blog/"><span>blog</span></a></li>
|
|
</ul>
|
|
<a class="viewsource" href="http://processingjs.org/sketches/bannerSketch.pde">view source</a>
|
|
</div>
|
|
|
|
<div class="page row">
|
|
<div class="span11">
|
|
<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
|
|
|
|
<tr class="name-row">
|
|
|
|
<th scope="row">Name</th>
|
|
|
|
<td><h3>background()</h3></td>
|
|
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">Examples</th>
|
|
|
|
<td><div class="example"><img src="background_.gif" alt="example pic" /><pre class="margin">background(51);</pre></div><div class="example"><img src="background_2.gif" alt="example pic" /><pre class="margin">background(255, 204, 0);</pre></div><div class="example"><img src="background_3.jpg" alt="example pic" /><pre class="margin">
|
|
|
|
// @pjs preload must be used to preload the image
|
|
|
|
/* @pjs preload="laDefense.jpg"; */
|
|
|
|
PImage b;
|
|
|
|
b = loadImage("laDefense.jpg");
|
|
|
|
background(b);</pre></div></td>
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
|
|
|
|
<th scope="row">Description</th>
|
|
|
|
<td>The <b>background()</b> function sets the color used for the background of the Processing window. The default background is light gray. In the <b>draw()</b> function, the background color is used to clear the display window at the beginning of each frame.
|
|
|
|
<br /><br />
|
|
|
|
An image can also be used as the background for a sketch, however its width and height must be the same size as the sketch window.
|
|
|
|
<br /><br />
|
|
|
|
Unlike Processing, it is possible to use transparency (alpha) in background colors with the main drawing surface.</td>
|
|
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">Syntax</th>
|
|
|
|
<td><pre>background(<kbd>gray</kbd>)
|
|
|
|
background(<kbd>gray</kbd>, <kbd>alpha</kbd>)
|
|
|
|
background(<kbd>value1</kbd>, <kbd>value2</kbd>, <kbd>value3</kbd>)
|
|
|
|
background(<kbd>value1</kbd>, <kbd>value2</kbd>, <kbd>value3</kbd>, <kbd>alpha</kbd>)
|
|
|
|
background(<kbd>color</kbd>)
|
|
|
|
background(<kbd>color</kbd>, <kbd>alpha</kbd>)
|
|
|
|
background(<kbd>hex</kbd>)
|
|
|
|
background(<kbd>hex</kbd>, <kbd>alpha</kbd>)</pre></td>
|
|
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">Parameters</th>
|
|
|
|
<td><table cellpadding="0" cellspacing="0" border="0">
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">gray</th>
|
|
|
|
<td>int or float: specifies a value between white and black</td>
|
|
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">alpha</th>
|
|
|
|
<td>int or float: opacity of the background</td>
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">value1</th>
|
|
|
|
|
|
|
|
<td>int or float: red or hue value (depending on the current color mode)</td>
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">value2</th>
|
|
|
|
<td>int or float: green or saturation value (depending on the current color mode)</td>
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">value3</th>
|
|
|
|
<td>int or float: blue or brightness value (depending on the current color mode)</td>
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">color</th>
|
|
|
|
<td>color: any value of the color datatype</td>
|
|
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">hex</th>
|
|
|
|
<td>int: color value in hexadecimal notation (i.e. #FFCC00 or 0xFFFFCC00)</td>
|
|
|
|
</tr>
|
|
|
|
</table></td>
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">Usage</th>
|
|
|
|
<td>Web & Application</td>
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
<tr class="">
|
|
|
|
<th scope="row">Related</th>
|
|
|
|
|
|
|
|
<td><a href="stroke_.1">stroke()</a><br />
|
|
|
|
<a href="fill_.1">fill()</a><br />
|
|
|
|
<a href="tint_.1">tint()</a><br />
|
|
|
|
<a href="colorMode_.1">colorMode()</a><br /></td>
|
|
|
|
</tr>
|
|
|
|
</table>
|
|
|
|
|
|
|
|
|
|
<div class="cclicense">
|
|
<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
|
|
<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/2.0/">
|
|
<img alt="Creative Commons License" border="0" src="../images/somerights20.gif" />
|
|
</a>
|
|
</div>
|
|
</div>
|
|
<div class="sidebar span4">
|
|
<h3><a href="http://processingjs.org/download/">Downloads</a></h3>
|
|
<ul>
|
|
<li><a href="http://processingjs.org/download/">Download the latest version of Processing.js!</a></li>
|
|
</ul>
|
|
|
|
<h3><a href="http://processingjs.org/articles/">Articles</a></h3>
|
|
<ul>
|
|
<li><a href="http://processingjs.org/articles/jsQuickStart.html">Quick Start - JavaScript Developer</a></li>
|
|
<li><a href="http://processingjs.org/articles/p5QuickStart.html">Quick Start - Processing Developer</a></li>
|
|
<li><a href="http://processingjs.org/articles/RenderingModes.html">Rendering Modes</a></li>
|
|
<li><a href="http://processingjs.org/articles/PomaxGuide.html">Pomax's Guide to processing-js</a></li>
|
|
</ul>
|
|
|
|
<h3><a>Web IDEs</a></h3>
|
|
<ul>
|
|
<li><a href="http://sketchpad.cc">Sketchpad.cc</a></li>
|
|
<li><a href="http://processingjs.org/tools/processing-helper.html">Processing.js Helper</a></li>
|
|
<li><a href="http://www.openprocessing.org">OpenProcessing.org</a></li>
|
|
</ul>
|
|
|
|
<h3><a href="http://processingjs.org/community/">Community</a></h3>
|
|
<ul>
|
|
<li><a href="irc://irc.mozilla.org/processing.js">IRC Channel</a></li>
|
|
<li><a href="http://processing-js.lighthouseapp.com/">Bug Tracker</a></li>
|
|
<li><a href="http://github.com/processing-js/processing-js/">Github Repository</a></li>
|
|
<li><a href="http://groups.google.com/group/processingjs">Google Group</a></li>
|
|
<li><a href="http://zenit.senecac.on.ca/wiki/index.php/">Open Source @ Seneca</a></li>
|
|
</ul>
|
|
|
|
<h3><a href="http://twitter.com/processingjs">Twitter Feed</a></h3>
|
|
<div class="twitter"></div>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="footer">
|
|
Processing is an open visualization language developed by
|
|
<a href="http://benfry.com/">Ben Fry</a> & <a href="http://reas.com/">Casey Reas</a>,
|
|
and originally ported to Javascript by
|
|
<a href="http://ejohn.org/blog/processingjs/">John Resig</a>.
|
|
Processing.js is maintained by the Processing.js team.
|
|
</div>
|
|
</div>
|
|
<a href="http://github.com/processing-js/processing-js/">
|
|
<img style="position: absolute; top: 0; right: 0; border: 0;" src="../images/forkme-right-orange.png" alt="Fork me on GitHub">
|
|
</a>
|
|
</body>
|
|
</html>
|