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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Draw a Circle</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for grid.circle {grid}"><tr><td>grid.circle {grid}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2> Draw a Circle </h2> <h3>Description</h3> <p>Functions to create and draw a circle. </p> <h3>Usage</h3> <pre> grid.circle(x=0.5, y=0.5, r=0.5, default.units="npc", name=NULL, gp=gpar(), draw=TRUE, vp=NULL) circleGrob(x=0.5, y=0.5, r=0.5, default.units="npc", name=NULL, gp=gpar(), vp=NULL) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>x</code></td> <td> <p>A numeric vector or unit object specifying x-locations.</p> </td></tr> <tr valign="top"><td><code>y</code></td> <td> <p>A numeric vector or unit object specifying y-locations.</p> </td></tr> <tr valign="top"><td><code>r</code></td> <td> <p>A numeric vector or unit object specifying radii.</p> </td></tr> <tr valign="top"><td><code>default.units</code></td> <td> <p>A string indicating the default units to use if <code>x</code>, <code>y</code>, <code>width</code>, or <code>height</code> are only given as numeric vectors.</p> </td></tr> <tr valign="top"><td><code>name</code></td> <td> <p> A character identifier. </p> </td></tr> <tr valign="top"><td><code>gp</code></td> <td> <p>An object of class <code>gpar</code>, typically the output from a call to the function <code>gpar</code>. This is basically a list of graphical parameter settings.</p> </td></tr> <tr valign="top"><td><code>draw</code></td> <td> <p>A logical value indicating whether graphics output should be produced.</p> </td></tr> <tr valign="top"><td><code>vp</code></td> <td> <p>A Grid viewport object (or NULL).</p> </td></tr> </table> <h3>Details</h3> <p>Both functions create a circle grob (a graphical object describing a circle), but only <code>grid.circle()</code> draws the circle (and then only if <code>draw</code> is <code>TRUE</code>). </p> <p>The radius may be given in any units; if the units are <em>relative</em> (e.g., <code>"npc"</code> or <code>"native"</code>) then the radius will be different depending on whether it is interpreted as a width or as a height. In such cases, the smaller of these two values will be the result. To see the effect, type <code>grid.circle()</code> and adjust the size of the window. </p> <p>What happens for very small radii is device-dependent: the circle may become invisible or be shown at a fixed minimum size. Circles of zero radius will not be plotted. </p> <h3>Value</h3> <p>A circle grob. <code>grid.circle()</code> returns the value invisibly. </p> <h3>Warning</h3> <p>Negative values for the radius are silently converted to their absolute value. </p> <h3>Author(s)</h3> <p>Paul Murrell</p> <h3>See Also</h3> <p><a href="Grid.html">Grid</a>, <code><a href="viewport.html">viewport</a></code> </p> <hr /><div style="text-align: center;">[Package <em>grid</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>