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250 lines
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<title>curve() | 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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<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>curve()</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="../curve_.gif" alt="example pic" /><pre class="margin">stroke(255, 102, 0);
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curve(5, 26, 5, 26, 73, 24, 73, 61);
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stroke(0);
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curve(5, 26, 73, 24, 73, 61, 15, 65);
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stroke(255, 102, 0);
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curve(73, 24, 73, 61, 15, 65, 15, 65);</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>Draws a curved line on the screen. The first and second parameters specify the first anchor point and the last two parameters specify the second anchor. The middle parameters specify the points for defining the shape of the curve. Longer curves can be created by putting a series of <b>curve()</b> functions together. An additional function called <b>curveTightness()</b> provides control for the visual quality of the curve. The <b>curve()</b> function is an implementation of Catmull-Rom splines. <span class="warning">Using the 3D version of requires rendering with P3D or OPENGL (see the Environment reference for more information).</span></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>curve(<kbd>x1</kbd>, <kbd>y1</kbd>, <kbd>x2</kbd>, <kbd>y2</kbd>, <kbd>x3</kbd>, <kbd>y3</kbd>, <kbd>x4</kbd>, <kbd>y4</kbd>);
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<span class="warning">curve(<kbd>x1</kbd>, <kbd>y1</kbd>, <kbd>z1</kbd>, <kbd>x2</kbd>, <kbd>y2</kbd>, <kbd>z2</kbd>, <kbd>x3</kbd>, <kbd>y3</kbd>, <kbd>z3</kbd>, <kbd>x4</kbd>, <kbd>y4</kbd>, <kbd>z4</kbd>);</span></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">x1, y1, <span class="warning">z1</span></th>
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<td>int or float: coordinates for the first anchor</td>
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</tr>
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<tr class="">
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<th scope="row">x2, y2, <span class="warning">z2</span></th>
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<td>int or float: coordinates for the first point</td>
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</tr>
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<tr class="">
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<th scope="row">x3, y3, <span class="warning">z3</span></th>
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<td>int or float: coordinates for the second point</td>
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</tr>
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<tr class="">
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<th scope="row">x4, y4, <span class="warning">z4</span></th>
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<td>int or float: coordinates for the second anchor</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="../curveVertex_.1">curveVertex()</a><br />
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<a href="../bezier_.1">bezier()</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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