[R] circle / oval / semicircle ?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Jun 25 19:45:05 CEST 2004
Circles *are* a graphics primitive in the sense that every R device driver
has to support them. See PS_Circle and PDF_Circle in file
src/main/devPS.c Note that PDF does not have arcs/circle as a primitive,
One gotcha is that you have to be able to draw circles clipped to a
OTOH, adding a graphic primitive (and we seem to need image for e.g.
better drawing of the output of image and for icons etc) is a very serious
The R interfaces are symbols() and grid.circle.
On Fri, 25 Jun 2004, ivo welch wrote:
> thanks, guys. circles might be a good candidate for a graphics
> primitive in the next R version, if only because---unlike the solutions
> here---I believe that postscript/pdf have scaleable primitives---though
> I am no postscript expert. of course, if I knew what I was talking
> about, I would just write the function and submit it. the closest I
> have found was in http://wtonline.vitalnews.com/Pages/Tip0163.html
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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