On Thu, Jul 12, 2012 at 9:39 PM, Martin Ivanov <tra...@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?
The 'par.settings' are only multipliers for the defaults, and you want
to change the original defaults. For example, the left margin is given
by
> lattice.getOption("layout.widths")$left.padding
$x
[1] 0.5
$units
[1] "char"
which you want to change to, say, list(x = 1, units = "mm"). See
?lattice.options on how to do that (and also the 'lattice.options'
entry in ?xyplot).
You might have better luck with the development version at
https://r-forge.r-project.org/R/?group_id=638
as it has some related bugfixes and documentation improvements.
-Deepayan
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