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224 lines
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>atan2()</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 draw() {
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background(204);
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translate(width/2, height/2);
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float a = atan2(mouseY-height/2, mouseX-width/2);
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rotate(a);
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rect(-12, -5, 24, 10);
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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>Calculates the angle (in radians) from a specified point to the coordinate origin as measured from the positive x-axis. Values are returned as a <b>float</b> in the range from <b>PI</b> to <b>-PI</b>. The <b>atan2()</b> function is most often used for orienting geometry to the position of the cursor. Note: The y-coordinate of the point is the first parameter and the x-coordinate is the second due the the structure of calculating the tangent.</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>atan2(<kbd>y</kbd>, <kbd>x</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">y</th>
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<td>int or float: y-coordinate of the point</td>
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</tr>
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<tr class="">
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<th scope="row">x</th>
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<td>int or float: x-coordinate of the point</td>
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</table></td>
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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="http://processingjs.org/reference/tan_.html">tan()</a><br /></td>
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