R help - Apr 2009 - Sweave: Changing the background color, adding a border

Hi all,

I am using Sweave to produce a document. Unfortunately, I have to print 
several copies and I can't print them in color. So I would like to 
change the way of printing the code. I would like to print the code in a 
box with a black borderline and a grey background (quite classic). Is it 
possible to do it by changing some Schunk options?

Christophe

On 19/04/2009 6:03 AM, Christophe Genolini wrote:
> Hi all,
> 
> I am using Sweave to produce a document. Unfortunately, I have to print 
> several copies and I can't print them in color. So I would like to 
> change the way of printing the code. I would like to print the code in a 
> box with a black borderline and a grey background (quite classic). Is it 
> possible to do it by changing some Schunk options?
It should be, if you know how to print things like that, but I don't 
Here's some code I wrote a while ago to modify the Sweave formats in a 
much simpler way:

% This removes the extra spacing after code and output chunks in Sweave,
% but keeps the spacing around the whole block.

\fvset{listparameters={\setlength{\topsep}{0pt}}}
\renewenvironment{Schunk}{\vspace{\topsep}}{\vspace{\topsep}}
% We want to avoid having examples switch us to an italic font shape.
\DefineVerbatimEnvironment{Soutput}{Verbatim}{fontshape=n}

Presumably some combination of \renewenvironment, \fvset (which sets 
fancyvrb parameters), or \DefineVerbatimEnvironment (a fancyvrb command) 
should do what you want.

Duncan Murdoch

Christophe Genolini wrote:
> Hi all,
>
> I am using Sweave to produce a document. Unfortunately, I have to 
> print several copies and I can't print them in color. So I would like 
> to change the way of printing the code. I would like to print the code 
> in a box with a black borderline and a grey background (quite 
> classic). Is it possible to do it by changing some Schunk options?
>
> Christophe
>
Hi Christophe,

This is not a trivial task, \Sinput and \Soutput environments are 
basically verbatim environments. You might want to have a look at the 
highlight package (not on CRAN yet) 
http://r-forge.r-project.org/R/?group_id=384 which ships a sweave driver 
that does some syntax highlighting of the code and does not rely on semi 
verbatim environments:

require( grid )
require( highlight, lib = "~/.R/library" )
v <- vignette( "grid", package = "grid" )
file.copy( v$file, "grid.Snw" )
Sweave( "grid.Snw", driver = HighlightWeaveLatex( ) )

See the result here: addictedtor.free.fr/misc/grid.pdf

The driver writes Hinput and Houtput environments instead of Sinput and 
Soutput, and they are defined as this in the preamble:

\newenvironment{Hinput}%
{}%
{}%
\newenvironment{Houtput}%
{}%
{}%

So you might imagine to redefine them using some combination of 
fcolorbox and minipage.

What happens with the box if the code spans more than one page ?

Romain

-- 
Romain Francois
Independent R Consultant
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr