Hi.
Q. Is there a way to record a plot using grDevices::recordPlot()
without opening an interactive (=visible GUI window) graphics device
(not even for a flash of a second)?
Related: help("recordPlot", package="grDevices") says:
"These functions record and replay the displaylist of the current
graphics device."
Is the intention that recordPlot() should be able to record from _any
type_ of graphics device, or only for _interactive_ ones? For
instance,
windows(); plot(1:10); g <- recordPlot(); dev.off();
x11(); plot(1:10); g <- recordPlot(); dev.off();
Cairo::CairoWin(); plot(1:10); g <- recordPlot(); dev.off();
all produce 'recordplot' objects that replot the figure with
replayPlot(g), whereas for instance
png("foo.png"); plot(1:10); g <- recordPlot(); dev.off();
pdf("foo.pdf"); plot(1:10); g <- recordPlot(); dev.off();
produce "empty" replayPlot(g) outputs.
Q. It it just a coincident that it appear that
recordPlot()/replayPlot() only works for
grDevices::deviceIsInteractive() graphics devices? If not, should
?recordPlot clarify that "These functions record and replay the
displaylist of the current [interactive] graphics device."?
Q. ...or is just the fact that currently png(), pdf() etc. won't
populate "the displaylist" (whatever that is), but if they would, then
recordPlot()/replayPlot() would indeed generate an non-empty plot? If
so, a note like "Note, recordPlot() will often record an empty plot on
non-interactive graphics devices as they do not populate the
displaylist." may be add to the help.
Thanks,
Henrik
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