[R] Changing grid defaults

[Paul Murrell]

Hi

On 7/04/2012 2:43 a.m., Brett Presnell wrote:
>
> I'm trying to use the vcd package to produce mosaic plots for my class
> notes, written in Sweave and using the LaTeX's beamer document class.
> For projecting the notes in class, I use a dark background with light
> foreground colors.  It's easy enough to change the defaults for R's
> standard graphics to match my color scheme (using the fg, col.axis,
> col.lab, col.main, and col.sub parameter settings), but I can't figure
> out how to do this with grid/strucplot/vcd.
>
>> From my experiments, I think that I might eventually figure out how to
> change the colors of all the text in the mosaic plots to what I want
> using arguments like 'gp_args = list(gp_labels = gpar(col = "yellow")'
> and 'gp_varnames = gpar(col = "yellow")' (although I still haven't
> figured out how to changed the color of the text on the legends), but
> this is obviously not what I need.  I have been reading all the
> documentation I can find, but I still haven't figured this out, so an
> answer accompanied by a reference to some line or the other in some
> piece of documentation would be greatly appreciated.

You could push a 'grid' viewport with the desired defaults and then 
hopefully 'vcd' will pick those up as its defaults.  The following 
example promises at least partial (if ugly) success ...

library(vcd)
pushViewport(viewport(gp=gpar(col="yellow")))
mosaic(Titanic, newpage=FALSE)

You can similarly set up font defaults.  See "Non-standard fonts in 
PostScript and PDF graphics" in 
http://cran.r-project.org/doc/Rnews/Rnews_2006-2.pdf for an example, 
plus also possibly http://www.stat.auckland.ac.nz/~paul/R/CM/CMR.html.

Paul

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-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
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