On 30/12/2015 3:54 PM, Dr Gregory Jefferis wrote:
Dear Duncan,
On 8 Oct 2015, at 22:10, Duncan Murdoch wrote:
On 08/10/2015 4:41 PM, Dr Gregory Jefferis wrote:
[snip]
I have a package which imports rgl i.e. rgl is loaded on package
startup. A number of examples (not tests) use rgl features and I do
not
want these to be run on CRAN.
Is there a way to configure rgl.useNULL to handle this situation?
I don't think so, but I don't think you really want that.
options(rgl.useNULL = TRUE)
doesn't stop rgl from running, it just stops it from trying to display
anything. So you could put code like
if (!interactive())
options(rgl.useNULL = TRUE)
into your .onLoad function for your package, and it wouldn't try to
open
a display on CRAN, or anywhere else that wasn't interactive.
I tried following this suggestion, but this has the unintended (for me)
consequence that it is no longer possible to get rgl snapshots e.g. in
knitr when rgl.useNULL=TRUE? From what I can see writeWebGL works fine
but snapshot3d does not and this is not quite what I was expecting
(though it seems fair enough in retrospect).
Is there a workaround to get snapshots out of a RGL null display?
No. 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.
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.
Duncan Murdoch
With many thanks,
Greg.
sessionInfo()
R version 3.2.3 (2015-12-10)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.9.5 (Mavericks)
locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] nat.nblast_1.6.1 catmaid_0.6 httr_1.0.0 nat_1.8.1
rgl_0.95.1435 devtools_1.9.1
loaded via a namespace (and not attached):
[1] Rcpp_0.12.2 formatR_1.2.1 plyr_1.8.3
nabor_0.4.6 tools_3.2.3
[6] nat.utils_0.5.1 digest_0.6.8 jsonlite_0.9.19
memoise_0.2.1 filehash_2.3
[11] igraph_1.0.1 curl_0.9.4 yaml_2.1.13 spam_1.3-0
stringr_1.0.0
[16] knitr_1.11 dendroextras_0.2.1 grid_3.2.3 R6_2.1.1
rmarkdown_0.7
[21] magrittr_1.5 codetools_0.2-14 htmltools_0.2.6
rsconnect_0.3.79 stringi_1.0-1
--
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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