On 30/12/2015 4:42 PM, Dr Gregory Jefferis wrote:
On 30 Dec 2015, at 21:11, Duncan Murdoch wrote:
Is there a workaround to get snapshots out of a RGL null display?
No.
OK. Thanks for confirming.
Theoretically it's possible to use a virtual frame buffer in X11 to
hold the image, but I've got no experience with that myself.
I have used xvfb in some headless environments (including travis).
If not, I think I am back to square 1 in terms of trying to figure
out
how to suppress rgl *examples* (tests are easy) on CRAN.
You can test for a null device using rgl.useNULL(). If that is true,
don't try to produce a snapshot.
I wasn't being clear there. I want to have rgl example code (e.g. plot3d
statements) in my documentation
* that's not enclosed in conditionals
* or \dontrun
* but that doesn't use a live rgl window during package check
(especially on CRAN)
* ... unless I do something to request this.
The code is not actually making snapshots.
I'm not sure I understand why. Why not write examples that produce rgl
displays (or nothing with a null device)? rgl itself has lots of these,
and passes checks on most systems. Currently it is supposed to detect
display initialization failures and fall back to the null device, but I
don't know if this works on the only CRAN system that seems to need it,
the OSX system, because I haven't seen results of tests yet.
I think what I may try is changing my .onLoad to look something like
this:
.onLoad <- function(libname, pkgname) {
DEVTOOLS_CRAN=toupper(Sys.getenv("NOT_CRAN")) %in% c("FALSE","0",
"NO")
# this is a heuristic to determine if we are running on CRAN
CRAN=toupper(Sys.getenv("_R_CHECK_INSTALL_DEPENDS_")) %in% c("TRUE",
"YES", "1")
if(!interactive() && is.null(getOption('rgl.useNULL')) &&
(DEVTOOLS_CRAN || CRAN)){
options(rgl.useNULL=TRUE)
}
}
I would be careful about that -- the CRAN people want to run realistic
tests, and they will likely object if you are trying to act differently
on their system than on your users' systems.
Duncan Murdoch
Thanks again,
Greg.
--
Gregory Jefferis, PhD
Division of Neurobiology
MRC Laboratory of Molecular Biology
Francis Crick Avenue
Cambridge Biomedical Campus
Cambridge, CB2 OQH, UK
http://www2.mrc-lmb.cam.ac.uk/group-leaders/h-to-m/g-jefferis
http://jefferislab.org
http://flybrain.stanford.edu
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