306 lines
8.6 KiB
HTML
306 lines
8.6 KiB
HTML
<!DOCTYPE html>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<title>background() | reference | Processing.js</title>
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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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<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>background()</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"><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">
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// @pjs preload must be used to preload the image
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/* @pjs preload="laDefense.jpg"; */
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PImage b;
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b = loadImage("laDefense.jpg");
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background(b);</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>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.
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<br /><br />
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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.
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<br /><br />
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Unlike Processing, it is possible to use transparency (alpha) in background colors with the main drawing surface.</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><pre>background(<kbd>gray</kbd>)
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background(<kbd>gray</kbd>, <kbd>alpha</kbd>)
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background(<kbd>value1</kbd>, <kbd>value2</kbd>, <kbd>value3</kbd>)
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background(<kbd>value1</kbd>, <kbd>value2</kbd>, <kbd>value3</kbd>, <kbd>alpha</kbd>)
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background(<kbd>color</kbd>)
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background(<kbd>color</kbd>, <kbd>alpha</kbd>)
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background(<kbd>hex</kbd>)
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background(<kbd>hex</kbd>, <kbd>alpha</kbd>)</pre></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">gray</th>
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<td>int or float: specifies a value between white and black</td>
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</tr>
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<tr class="">
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<th scope="row">alpha</th>
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<td>int or float: opacity of the background</td>
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</tr>
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<tr class="">
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<th scope="row">value1</th>
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<td>int or float: red or hue value (depending on the current color mode)</td>
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</tr>
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<tr class="">
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<th scope="row">value2</th>
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<td>int or float: green or saturation value (depending on the current color mode)</td>
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</tr>
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<tr class="">
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<th scope="row">value3</th>
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<td>int or float: blue or brightness value (depending on the current color mode)</td>
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</tr>
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<tr class="">
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<th scope="row">color</th>
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<td>color: any value of the color datatype</td>
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</tr>
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<tr class="">
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<th scope="row">hex</th>
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<td>int: color value in hexadecimal notation (i.e. #FFCC00 or 0xFFFFCC00)</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</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><a href="../stroke_.1">stroke()</a><br />
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<a href="../fill_.1">fill()</a><br />
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<a href="../tint_.1">tint()</a><br />
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<a href="../colorMode_.1">colorMode()</a><br /></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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<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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<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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<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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<a href="http://github.com/processing-js/processing-js/">
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