260 lines
7.6 KiB
HTML
260 lines
7.6 KiB
HTML
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<title>noLoop() | 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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<canvas width="940px" height="78px" data-processing-sources="/sketches/bannerSketch.pde"></canvas>
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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>noLoop()</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>void setup() {
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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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line(10, 10, 190, 190);
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}</pre></div><hr class="noShade" noshade="noshade" size="1" /><div class="example"><pre>void setup() {
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size(200, 200);
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}
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float x = 0.0;
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void draw() {
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background(204);
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x = x + 0.1;
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if (x > width) {
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x = 0;
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}
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line(x, 0, x, height);
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}
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void mousePressed() {
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noLoop();
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}
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void mouseReleased() {
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loop();
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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>Stops Processing from continuously executing the code within <b>draw()</b>. If <b>loop()</b> is called, the code in <b>draw()</b> begin to run continuously again. If using <b>noLoop()</b> in <b>setup()</b>, it should be the last line inside the block.
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<br /><br />
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When <b>noLoop()</b> is used, it's not possible to manipulate or access the screen inside event handling functions such as <b>mousePressed()</b> or <b>keyPressed()</b>. Instead, use those functions to call <b>redraw()</b> or <b>loop()</b>, which will run <b>draw()</b>, which can update the screen properly. This means that when noLoop() has been called, no drawing can happen, and functions like saveFrame() or loadPixels() may not be used.
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<br /><br />
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Note that if the sketch is resized, <b>redraw()</b> will be called to update the sketch, even after <b>noLoop()</b> has been specified. Otherwise, the sketch would enter an odd state until <b>loop()</b> was called.</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>noLoop()</pre></td>
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</tr>
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<tr class="">
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<th scope="row">Returns</th>
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<td>None</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="../loop_.1">loop()</a>
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<br /><a href="../redraw_.1">redraw()</a>
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<br /><a href="../draw_.1">draw()</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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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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