It is not clear to me what you want in the lattice context, but perhaps

?print.trellis

may be relevant.

Note that  "inner" and "outer" margins are not directly translatable in
lattice, as there are multiple levels of plots involved, all determined by
viewport contexts. Ergo my confusion about what you're after.

Cheers,
Bert

On Thu, Jul 12, 2012 at 9:09 AM, Martin Ivanov <tramni@abv.bg> wrote:

>  Dear R users,
>
> I have a lot of experience with traditional R graphics, but I decided to
> turn to trellis as
> it was recommended for spatial graphs by the sp package. In traditional R
> graphics
> I always first set the size of the device region absolute units (e.g.  mm)
> and then I
> firmly fix the inner margins with mai and the outer margins with oma also
> in absolute units.
> What is left from the device region is for the plot region. That is my
> general idea.
>
> My question is, is it possible to achieve that full control with trellis
> graphics? I have tried
> with the *.paddings parameters, but it seems to me that the margins are
> still larger than I have set them.
> Here is my example code: (mp is a SpatialPixelsDataFrame)
>
> xlim <- c(.96*bbox(mp)[1, 1], 1.02*bbox(mp)[1, 2]);
> ylim <- c(.992*bbox(mp)[2, 1], 1.005*bbox(mp)[2, 2]);
> b <- 1; t <- 2; # b, t : should be bottom and top figure margins
> l <- 1; r <- 6; # l, r : should be left and right figure margins
> asp <- mapasp(data=mp, xlim=xlim, ylim=ylim);
> # I have set the width of the device region as w millimetres and here I
> calculate
> # its height, taking care of the aspect ratio
> h <- b + t + asp*(w - (l + r));
>
> postscript(output, onefile=FALSE, paper="special", width=w/25.4,
> height=h/25.4, horizontal=FALSE, fonts=c("Times"), print.it=FALSE,
> colormodel="rgb", pointsize=12);
>
> # here I set all the possible paddings to make sure that all other margins
> are 0:
> trellis.par.set(layout.widths=list(left.padding=l, right.padding=r,
> key.ylab.padding = 0,
> ylab.axis.padding = 0, axis.key.padding = 0, units="mm"),
> layout.heights=list(bottom.padding=b, top.padding=t, main.key.padding = 0,
> key.axis.padding = 0, axis.xlab.padding = 0,
> xlab.key.padding = 0, key.sub.padding = 0, units="mm"),
> axis.components=list(bottom=list(pad1=.8), left=list(pad1=.8)));
>
> But still, the resulting margins are larger than I expect and to achieve
> the desired effect I have to set some parameters to negative numbers. So I
> guess there are some other graphical parameters that come into play, about
> which I do not know.
> Which margins are these *.padding parameters controlling: the outer
> (device) or the inner (figure) margins?
>
> Any suggestions will be appreciated.
>
> Regards,
> Martin
>
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

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