[R] grid and ps device (bg-color)

Paul Murrell p.murrell at auckland.ac.nz
Tue May 3 22:29:25 CEST 2005


mkondrin wrote:
> Hi!
>> grid.rect(width=2, height=2,
>>           gp=gpar(fill=ps.options()$bg.color))
> Yes, it works (more or less), but the best is to use
> grid.rect(width=unit(1,"npc")+unit(0.5,"inches"),...)
> as postscript device leaves a 0.25-inch frame around the page.
> BTW wouldn't you fix a bug with the determination of "strwidth" in the 
> code like this:
> l<-c("1","23","456","7890")
> unit(1,"strwidth",l)
> The last command calculates the width of the first element of l, which 
> is not the thing one would like to have. The best would be the 
> calculation of maximum length of vector's elements (a simple for-cycle 
> in unit.c). It also solves the problems with
> t<-grid.text(l,y=c(0.9,0.8,0.7,0.6))
> unit(1,"grobwidth",t)
> where the desired answer should be the length of the longest string in l 
> (in R-2.0.1 this returns the length of the l[[0]] too).
> I have fixed it in my R installation but the patch is obvious.

This is fixed (different) in R 2.1.0.  If there are several strings, the 
width is taken from the bounding box of the strings.  For example

             "bits of", "text", "with the longest",
             "not the first"), x=.5, y=1:5/6)))

Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
New Zealand
64 9 3737599 x85392
paul at stat.auckland.ac.nz

More information about the R-help mailing list