I almost always supply my own aspect ratio when plotting using
lattice. When I plot these to pdf, I would like to specify pdf
dimensions that will result in minimal margins around the plot. In my
application, resorting to a pdf cropper after plotting is not an
option - I must do it in R. The problem is that I cannot determine
the correct aspect ratio for the overall plot (accounting for strip
labels, keys, titles, labels, etc.) that would help me determine the
correct pdf dimensions. I can roughly estimate what the overall
aspect ratio will be using the layout, etc., but this is not good
enough. Is there a way to calculate the true overall aspect ratio for
the entire plot?
Example: If I make a simple plot and specify aspect=0.5, you would
think that dimensions width=10, height=5 would be a good
approximation, but for example:
library(lattice)
pdf("plot.pdf", width=10, height=5)
xyplot(rnorm(100) ~ rnorm(100), aspect=0.5,
xlab="this is some extra text\n
to show that the\n
overall aspect ratio\n
of a plot is not always\n
easily determined by\n
the aspect ratio specified for the data")
dev.off()
doesn't work. It looks like the true aspect ratio of the resulting
non-margin area in the pdf is about 0.86. I'd like to know this in R
before making the pdf so I can specify dimensions accordingly. Any
ideas?
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