From paul@stat.auckland.ac.nz  Wed Feb  7 20:28:57 2001
From: paul@stat.auckland.ac.nz (Paul Murrell)
Date: Thu, 8 Feb 2001 09:28:57 +1300
Subject: [Rd] Re: Writing graphics code (was: [R] get vector data from contour)
References: <qf238t4ps6bht9tvkblvfnof8a7oe106o0@4ax.com>
Message-ID: <008c01c09144$9b684740$175dd882@stat.auckland.ac.nz>

Hi


----- Original Message -----
From: Duncan Murdoch <murdoch@stats.uwo.ca>
To: <r-devel@stat.math.ethz.ch>
Sent: Thursday, February 08, 2001 6:51 AM
Subject: [Rd] Re: Writing graphics code (was: [R] get vector data from
contour)


> I submitted a message to r-help this morning that really belongs in
> r-devel; here's its URL in the archive:
> <http://www.r-project.org/nocvs/mail/r-help/2001/0693.html>.
>
> In summary, I suggest that R graphics objects should be accessible and
> modifiable, but it raises some problems if you want to do it without
> pointers.


I have been doing some similar stuff to what you describe (primitives and
groups arranged in hierarchies), but for 2D graphics, and I have used Luke
Tierney's "external pointers" to provide access to graphical objects which
represent the graphical output.  See the R developer page
http://developer.r-project.org/ for Luke's stuff, but please note the
disclaimer at the top of that page.

Paul


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[Rd] Re: Writing graphics code (was: [R] get vector data from contour)
Paul Murrell