> The problem is that the device chosen by dev.new() depends on the GUI.
> You can see the code that does this in grDevices:::.onLoad. So in fact
> with noRstudioGD=TRUE, the decision is identical to what it is in R:
> you only get X11 if your GUI is X11 or Tk, you get pdf otherwise.
> It's pretty common to use R on a machine where X11 won't work, so this
> makes sense.
But not if running from RStudio always causes the X11 check to fail. If the
function is used outside RStudio, there's little point in specifying
noRStudioGD=TRUE in the first place.
If you consider the code used to determine whether quartz() or X11() is
available
dsp <- Sys.getenv("DISPLAY")
if (.Platform$OS.type == "windows")
windows
else if (.Platform$GUI == "AQUA" || ((!nzchar(dsp) ||
grepl("^/tmp/launch-", dsp)) && .Call(C_makeQuartzDefault)))
quartz
else if (nzchar(dsp) && .Platform$GUI %in% c("X11", "Tk"))
X11
else defdev
you can see that it checks for a DISPLAY variable and assumes that X11 can be
used if it is set. Wouldn't it be just as safe to add RStudio to the list of
accepted .Platform$GUIs?
In my case (Mac OS X 10.10.5), I'd like to get a quartz device. The problem
here is that I have XQuartz installed, so DISPLAY is always set and looks like
this
/private/tmp/com.apple.launchd.2wKas4wzPe/org.macosforge.xquartz:0
while dev.new() checks for ^/tmp/launch-; I suppose the DISPLAY variable has
changed between different versions of Mac OS X or XQuartz. Perhaps the
additional patterns could just be added to the grepl() call?
Best,
Stefan
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