216 lines
6.7 KiB
Groff
216 lines
6.7 KiB
Groff
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<title>PI (3.14159...) | reference | Processing.js</title>
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<span class="tagline">a port of the Processing Visualization Language</span>
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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>PI (3.14159...)</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="PI.gif" alt="example pic" /><pre class="margin">float f = 0.0;
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beginShape(POLYGON);
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while(f < PI) {
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vertex(width/2 + cos(f)*40, height/2 + sin(f)*40);
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f += PI/12.0;
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}
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endShape();</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>PI is a mathematical constant with the value 3.14159265358979323846. It is the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions <b>sin()</b> and <b>cos()</b>.</td>
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<tr class="">
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<th scope="row">Syntax</th>
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<td><pre>PI</pre></td>
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<th scope="row">Parameters</th>
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<th scope="row">Usage</th>
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<td>Web & Application</td>
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<tr class="">
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<th scope="row">Related</th>
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<td><a href="TWO_PI.1">TWO_PI</a><br />
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<a href="HALF_PI.1">HALF_PI</a><br /></td>
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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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