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Java/Processing/processing-3.3.6/modes/java/reference/this.html
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Java/Processing/processing-3.3.6/modes/java/reference/this.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<title>this \ Language (API) \ Processing 2+</title>
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<link rel="icon" href="/favicon.ico" type="image/x-icon" />
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="Author" content="Processing Foundation" />
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<meta name="Publisher" content="Processing Foundation" />
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<meta name="Keywords" content="Processing, Sketchbook, Programming, Coding, Code, Art, Design" />
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<meta name="Description" content="Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology." />
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<meta name="Copyright" content="All contents copyright the Processing Foundation, Ben Fry, Casey Reas, and the MIT Media Laboratory" />
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<script src="javascript/modernizr-2.6.2.touch.js" type="text/javascript"></script>
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<link href="css/style.css" rel="stylesheet" type="text/css" />
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</head>
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<body id="Langauge-en" onload="" >
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<div id="container">
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<!-- ==================================== HEADER ============================ -->
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<div id="ribbon">
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<ul class="left">
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<li class="highlight"><a href="http://processing.org/">Processing</a></li>
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<li><a href="http://p5js.org/">p5.js</a></li>
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<li><a href="http://py.processing.org/">Processing.py</a></li>
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<li><a href="http://android.processing.org/">Processing for Android</a></li>
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</ul>
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<ul class="right">
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<li><a href="https://processingfoundation.org/">Processing Foundation</a></li>
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</ul>
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<div class="clear"></div>
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</div>
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<div id="header">
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<a href="/" title="Back to the Processing cover."><div class="processing-logo no-cover" alt="Processing cover"></div></a>
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<form name="search" method="get" action="//www.google.com/search">
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<p><input type="hidden" name="as_sitesearch" value="processing.org" />
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<input type="text" name="as_q" value="" size="20" class="text" />
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<input type="submit" value=" " /></p>
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</form>
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</div>
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<a id="TOP" name="TOP"></a>
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<div id="navigation">
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<div class="navBar" id="mainnav">
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<a href="index.html" class='active'>Language</a><br>
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<a href="libraries/index.html" >Libraries</a><br>
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<a href="tools/index.html">Tools</a><br>
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<a href="environment/index.html">Environment</a><br>
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</div>
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<script> document.querySelectorAll(".processing-logo")[0].className = "processing-logo"; </script>
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</div>
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<!-- ==================================== CONTENT - Headers ============================ -->
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<div class="content">
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<p class="ref-notice">This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, <a href="https://github.com/processing/processing-docs/issues?state=open">please let us know</a>. If you prefer a more technical reference, visit the <a href="http://processing.github.io/processing-javadocs/core/">Processing Core Javadoc</a> and <a href="http://processing.github.io/processing-javadocs/libraries/">Libraries Javadoc</a>.</p>
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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>this</h3></td>
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</tr>
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<tr class="">
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<tr class=""><th scope="row">Examples</th><td><div class="example"><pre >
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float ypos = 50;
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void setup() {
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size(100, 100);
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noLoop();
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}
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void draw() {
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line(0, 0, 100, ypos);
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// "this" references the Processing sketch,
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// and is not necessary in this case
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this.ypos = 100;
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line(0, 0, 100, ypos);
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}
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</pre></div>
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<hr class="noshade" noshade="noshade" size="1">
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<div class="example"><pre >
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import processing.video.*;
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Movie myMovie;
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void setup() {
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size(200, 200);
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background(0);
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// "this" references the Processing sketch
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myMovie = new Movie(this, "totoro.mov");
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myMovie.loop();
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}
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void draw() {
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if (myMovie.available()) {
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myMovie.read();
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}
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image(myMovie, 0, 0);
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}
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</pre></div>
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</td></tr>
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<tr class="">
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<th scope="row">Description</th>
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<td>
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Refers to the current object (i.e., "this object"), which will change depending on the context in which <b>this</b> is referenced. In Processing, it's most common to use <b>this</b> to pass a reference from the current object into one of the libraries.<br />
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<br />
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The keyword <b>this</b> can also be used to reference an object's own method from within itself, but such usage is typically not necessary. For example, if you are calling the <b>filter()</b> method of a <b>PImage</b> object named <b>tree</b> from another object, you would write <b>tree.filter()</b>. To call this method inside the PImage object itself, one could simply write <b>filter()</b> or, more explicitly, <b>this.filter()</b>. The additional level of specificity in <b>this.filter()</b> is not necessary, as it is always implied.
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</td>
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</tr>
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</table>
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Updated on April 30, 2017 02:33:23pm EDT<br /><br />
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<!-- Creative Commons License -->
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<div class="license">
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<a rel="license" href="//creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border: none" src="https://licensebuttons.net/l/by-nc-sa/4.0/88x31.png" /></a>
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</div>
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<xapRights:UsageTerms>
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<rdf:Alt>
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<rdf:li xml:lang='x-default' >This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.</rdf:li>
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<rdf:li xml:lang='en' >This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.</rdf:li>
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<rdf:Description rdf:about=''
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<cc:license rdf:resource='http://creativecommons.org/licenses/by-nc-sa/4.0/'/>
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-->
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</div>
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<!-- ==================================== FOOTER ============================ -->
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<div id="footer">
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<div id="copyright">Processing is an open project intiated by <a href="http://benfry.com/">Ben Fry</a> and <a href="http://reas.com">Casey Reas</a>. It is developed by a <a href="http://processing.org/about/people/">team of volunteers</a>.</div>
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<div id="colophon">
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<a href="copyright.html">© Info</a>
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</div>
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