Is there a trick to creating a graphics device in the absence of an actual display in order to create an image in a file?
Look for Xvfb (X virtual frame buffer). Not sure what OS you are running, but on RH9 and Fedora, at least, there is a package called XFree86-Xvfb.
I use Xvfb with the following command:
/usr/X11R6/bin/Xvfb :5 -screen 0 1024x768x16
More specifically I wrote an init script and set Xvfb up to start as a service on boot.
Then in R I use: x11(display=":5")
HTH,
Joe
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