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\name{draw.circle}
\alias{draw.circle}
\title{Draw a circle}
\description{Draws a circle on an existing plot.}
\usage{
draw.circle(x,y,radius,nv=100,border=NULL,col=NA,lty=1,lwd=1)
}
\arguments{
\item{x,y}{Coordinates of the center of the circle.}
\item{radius}{Radius (or radii) of the circle(s) in user units.}
\item{nv}{Number of vertices to draw the circle.}
\item{border}{Color to use for drawing the circumference.}
\item{col}{Color to use for filling the circle.}
\item{lty}{Line type for the circumference.}
\item{lwd}{Line width for the circumference.}
}
\value{
A list with the x and y coordinates of the points on the circumference
of the last circle displayed.
}
\note{
The principal advantage of \samp{draw.circle} is that it adjusts for
the aspect ratio of the plot.
}
\author{Jim Lemon}
\seealso{\link{polygon}}
\examples{
plot(1:5,seq(1,10,length=5),type="n",xlab="",ylab="",main="Test draw.circle")
draw.circle(2,4,c(1,0.66,0.33),border="purple",
col=c("#ff00ff","#ff77ff","#ffccff"),lty=1,lwd=1)
draw.circle(2.5,8,0.6,border="red",lty=3,lwd=3)
draw.circle(4,3,0.7,border="green",lty=1,lwd=1)
draw.circle(3.5,7,0.8,border="blue",lty=2,lwd=2)
}
\keyword{misc}
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