226 lines
7.3 KiB
HTML
226 lines
7.3 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>blue() | reference | Processing.js</title>
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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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<ul>
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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/download/"><span>download</span></a></li>
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<li><a href="../index.html"><span>reference</span></a></li>
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<li><a href="http://processingjs.org/exhibition/"><span>exhibition</span></a></li>
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<li><a href="http://processingjs.org/learning/"><span>learning</span></a></li>
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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>blue()</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="../blue_.gif" alt="example pic" /><pre class="margin">noStroke();
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color c = color(0, 126, 255);
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fill(c);
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rect(15, 20, 35, 60);
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float value = blue(c); // Sets "value" to "255"
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fill(value);
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rect(50, 20, 35, 60);</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>Extracts the blue value from a color, scaled to match current <b>colorMode()</b>. This value is always returned as a float so be careful not to assign it to an int value.<br /><br />The <b>blue()</b> function is easy to use and undestand, but is slower than another technique. To achieve the same results when working in <b>colorMode(RGB, 255)</b>, but with greater speed, use a bit mask to remove the other color components. For example, the following two lines of code are equivalent:<br /><pre>float r1 = blue(myColor);<br />float r2 = myColor & 0xFF;</pre></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>blue(<kbd>color</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">color</th>
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<td>any value of the color datatype</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>
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<a href="../red_.1">red()</a><br />
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<a href="../green_.1">green() </a><br />
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<a href="../alpha_.1">alpha() </a><br />
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<a href="../hue_.1">hue() </a><br />
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<a href="../saturation_.1" >saturation() </a><br />
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<a href="../brightness_.1" >brightness()</a><br />
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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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<div class="sidebar span4">
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<h3><a href="http://processingjs.org/download/">Downloads</a></h3>
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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/RenderingModes.html">Rendering Modes</a></li>
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<h3><a>Web IDEs</a></h3>
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<ul>
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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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