218 lines
7.6 KiB
Groff
218 lines
7.6 KiB
Groff
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<title>rotate() | 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>rotate()</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="rotate_.gif" alt="example pic" /><pre class="margin">translate(width/2, height/2);
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rotate(PI/3.0);
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rect(-26, -26, 52, 52);</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>Rotates an object the amount specified by the <b>angle</b> parameter. Angles should be specified in radians (values from 0 to PI*2) or converted to radians with the <b>radians()</b> function. Objects are always rotated around their relative position to the origin and positive numbers rotate objects in a clockwise direction with 0 radians or degrees being up and HALF_PI being to the right etc. Transformations apply to everything that happens after and subsequent calls to the function accumulates the effect. For example, calling <b>rotate(PI/2)</b> and then <b>rotate(PI/2)</b> is the same as <b>rotate(PI)</b>. If <b>rotate()</b> is called within the <b>draw()</b>, the transformation is reset when the loop begins again. Technically, <b>rotate()</b> multiplies the current transformation matrix by a rotation matrix. This function can be further controlled by the <b>pushMatrix()</b> and <b>popMatrix()</b>.</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>rotate(<kbd>angle</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">angle</th>
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<td>float: angle of rotation specified in radians or degrees depending on the current angle mode</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="rotateX_.1">rotateX() </a><br />
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<a href="rotateY_.1">rotateY() </a><br />
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<a href="rotateZ_.1">rotateZ() </a><br />
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<a href="translate_.1">translate() </a><br />
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<a href="scale_.1">scale() </a><br />
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<a href="pushMatrix_.1">pushMatrix()</a>
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<br /><a href="popMatrix_.1">popMatrix()</a><br /></td>
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</tr>
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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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<a href="http://ejohn.org/blog/processingjs/">John Resig</a>.
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