[R] pdf with an exact size

[Renaud Lancelot]

The package grid provides very convenient tools for such things:

library(grid)
pdf(file = "square.pdf", paper = "a4")
pushViewport(viewport())
grid.rect(width = 100, height = 100, default.units = "mm")
dev.off()

works just fine for me (R 2.4.1, MS WIndows XP): the printed output on
my inkjet printer is exactly 100 mm x 100 mm.

Best,

Renaud

2007/2/23, Joerg van den Hoff <j.van_den_hoff at fzd.de>:
> On Fri, Feb 23, 2007 at 04:24:54PM -0200, Alberto Monteiro wrote:
> > Is it possible to create a pdf output file with an (as nearly as
> > possible) exact size?
> >
> > For example, if I want to draw in an A4 paper (210 x 297 mm) a
> > square of 100 x 100 mm, how can I do it?
> >
> > FWIW, about 6 months ago I learned here how to create an exact
> > png image. For example, if I want a 500 x 500 black square in
> > a 1000 x 1000 white png, occupying the center of the png, the
> > procedure is this:
> >
> >   png("image.png", width=1000, height=1000, bg="white")
> >   par(mar=c(0,0,0,0)) # reset margins
> >   plot(0, xlim=c(0, 999), ylim=c(0, 999), col="white")
> >   par(usr=c(0, 999, 0, 999))
> >   points(c(250, 250, 749, 749, 250), c(250, 749, 749, 250, 250),
> >     type="l", col="black")
> >   dev.off()
> >
> > However, I don't know how do this with a pdf monstr... oops... file.
> >
> > Alberto Monteiro
> >
>
> going via `bitmap' and using the `pdfwrite' type is probably the better
> idea since in this case `ghostscript` is used for pdf generation which seems
> over all to generate cleaner/better pdf-output in comparsion
> to the R internal pdf-device (I believe there was recently some
> discussion of this on the list?).
>
> joerg
>
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-- 
Renaud LANCELOT
Département Systèmes Biologiques du CIRAD
CIRAD, Biological Systems Department

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