On Mar 12, 2011, at 10:56 AM, Allan Kamau wrote:
--- On Sat, 3/12/11, Allan Kamau <kamaual...@gmail.com> wrote:
From: Allan Kamau <kamaual...@gmail.com>
Subject: [R] Drawing a circle on an existing graph.
To: r-help@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.
On Sat, Mar 12, 2011 at 5:28 PM, John Kane <jrkrid...@yahoo.ca> wrote:
Is this of any use? http://tolstoy.newcastle.edu.au/R/help/06/04/25821.html
Thank you John, that is what I was looking for.
The code does draw a neat circle that is not stretched. After plotting
the circle on an existing plot I notice that the original plot was
indeed stretched somehow by approximately some 1:1.1 ratio (I think).
Now I am looking for a way to enforce none stretching in my original
graph.
`plot.window` has an `asp` argument that is useful for that purpose.
Most plotting with base graphics will pass an asp=1 argument along as
part of the `...` arguments,
--
David Winsemius, MD
West Hartford, CT
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