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Edit File: grid.bezier.html
<!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 Bezier Curve</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.bezier {grid}"><tr><td>grid.bezier {grid}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2> Draw a Bezier Curve </h2> <h3>Description</h3> <p>These functions create and draw Bezier Curves (a curve drawn relative to 4 control points). </p> <h3>Usage</h3> <pre> grid.bezier(...) bezierGrob(x = c(0, 0.5, 1, 0.5), y = c(0.5, 1, 0.5, 0), id = NULL, id.lengths = NULL, default.units = "npc", arrow = NULL, 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 of spline control points.</p> </td></tr> <tr valign="top"><td><code>y</code></td> <td> <p>A numeric vector or unit object specifying y-locations of spline control points.</p> </td></tr> <tr valign="top"><td><code>id</code></td> <td> <p>A numeric vector used to separate locations in <code>x</code> and <code>y</code> into multiple beziers. All locations with the same <code>id</code> belong to the same bezier.</p> </td></tr> <tr valign="top"><td><code>id.lengths</code></td> <td> <p>A numeric vector used to separate locations in <code>x</code> and <code>y</code> into multiple bezier. Specifies consecutive blocks of locations which make up separate beziers.</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> or <code>y</code> are only given as numeric vectors.</p> </td></tr> <tr valign="top"><td><code>arrow</code></td> <td> <p>A list describing arrow heads to place at either end of the bezier, as produced by the <code>arrow</code> function.</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>vp</code></td> <td> <p>A Grid viewport object (or NULL).</p> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>Arguments to be passed to <code>bezierGrob</code>.</p> </td></tr> </table> <h3>Details</h3> <p>Both functions create a beziergrob (a graphical object describing a Bezier curve), but only <code>grid.bezier</code> draws the Bezier curve. </p> <p>A Bezier curve is a line drawn relative to 4 control points. </p> <p>Missing values are not allowed for <code>x</code> and <code>y</code> (i.e., it is not valid for a control point to be missing). </p> <p>The curve is currently drawn using an approximation based on X-splines. </p> <h3>Value</h3> <p>A grob object. </p> <h3>See Also</h3> <p><a href="Grid.html">Grid</a>, <code><a href="viewport.html">viewport</a></code>, <code><a href="arrow.html">arrow</a></code>. </p> <p><code><a href="grid.xspline.html">grid.xspline</a></code>. </p> <h3>Examples</h3> <pre> x <- c(0.2, 0.2, 0.4, 0.4) y <- c(0.2, 0.4, 0.4, 0.2) grid.newpage() grid.bezier(x, y) grid.bezier(c(x, x + .4), c(y + .4, y + .4), id=rep(1:2, each=4)) grid.segments(.4, .6, .6, .6) grid.bezier(x, y, gp=gpar(lwd=3, fill="black"), arrow=arrow(type="closed"), vp=viewport(x=.9)) </pre> <hr /><div style="text-align: center;">[Package <em>grid</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>