[R] Drawing a circle on an existing graph.

[John Kane]

Is this of any use? http://tolstoy.newcastle.edu.au/R/help/06/04/25821.html

--- On Sat, 3/12/11, Allan Kamau <kamauallan at gmail.com> wrote:

> From: Allan Kamau <kamauallan at gmail.com>
> Subject: [R] Drawing a circle on an existing graph.
> To: r-help at r-project.org
> Received: Saturday, March 12, 2011, 3:08 AM
> I would like to draw a circle on a
> graph I am plotting in R and use
> the current plot's coordinate system.
> The most basic functionality I am looking for is the
> ability to plot a
> circle on an already existing graph by simply providing the
> xy
> coordinates for it's centre and the radius.
> 
> I am also looking for a way to obtain x,y values of a point
> (of a
> circle) by specifying only the origin x,y the angle and
> radius.
> 
> Please point me so such a library and perhaps some simple
> one line code.
> 
> Allan.
> 
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