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, unlike PS.
One gotcha is that you have to be able to draw circles clipped to a viewport. 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 undertaking. 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, [EMAIL PROTECTED] 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 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
