Understanding padding in lattice

On Tue, Apr 28, 2009 at 11:51 AM, Sebastien Bihorel
<Sebastien.Bihorel at cognigencorp.com> wrote:

Dear R-users,

I am trying to understand what the different padding arguments in
trellis.par.set are exactly controlling the space around lattice plots. I
have used the following code as a basis for testing but it did not really
help me to visualize how the value of each argument changes the margins and
the plotting area. I guess a better way to visualize the effects of these
padding items would be to create colored polygons for each related "area" of
interest... but I would need to know what are these areas beforehand!

You can retrieve the undelying grid layout and show it using

library(grid)
grid.show.layout(lattice:::lattice.getStatus("layout.details")$page.layout)

which is close to what you are describing. Otherwise, there's no easy
way to insert polygons in these areas that I know of.

You could try setting negative padding values to see what they do.

-Deepayan

Any advise on how to improve this code would be greatly appreciated.

Sebastien

#######################
library(lattice)
foo <-
data.frame(x=rep(seq(10),9),y=rep(seq(10),9),z=rep(0,90),id=rep(seq(9),each=10))
plot1 <- xyplot(y+z~x|id,
              data=foo,
              type=c("p","l"),
              distribute.type = TRUE,
              main="This is a test",
              sub="Subtitle",
              auto.key=T)
trellis.device(pdf, file = "trellis_par_test.pdf",
             paper="letter",
             #family="Courier",
             theme = list(fontsize = list(text = 10, points = 10)))
trellis.par.set(layout.widths =list(left.padding=0,
                                  right.padding=0),
              layout.heights=list(top.padding =1,
                                  main.key.padding =1,
                                  axis.xlab.padding=1,
                                  key.sub.padding  =1,
                                  bottom.padding   =1),
              axis.components=list(top=list(tck=1,
                    pad1=1,
pad2=1),                                    right=list(tck=1,
                                pad1=1,
                                              pad2=1))) print(plot1)
dev.off()
###########################



--
*Sebastien Bihorel, PharmD, PhD*
PKPD Scientist
Cognigen Corp
Email: sebastien.bihorel at cognigencorp.com
<mailto:sebastien.bihorel at cognigencorp.com>
Phone: (716) 633-3463 ext. 323