Re: prosper style files

On Mon, Jun 09, 2003 at 08:07:24PM +0100, Diana Galletly wrote:

> I'm preparing a presentation using the prosper extensions to the LaTeX
> seminar class.  For reasons best known only to myself in my more deluded
> moments, I decided I didn't like any of the basic template styles and
> that I'd prefer to write my own.  My problem is that I'd like the first
> page (titlepage, basically) to have an entirely different look to the rest of
> the pages.  But I don't know how to tell the style to "do X if it's the
> first page, else do Y"; I've generally managed to avoid digging around
> too much in LaTeX/TeX internals up until now, so any pointers would be
> gratefully received ...

Though prosper does not maintain a page counter, TeX's counter 0 keeps
track of the number of the output page.  You can therefore test
whether this counter is 1 to see whether you are on the first page.

This is achieved with the following macro \iffirstslide{...}{...}:

  \makeatletter
  \newcommand{\iffirstslide}{%
    \ifnum\the\count0=1\relax%
      \expandafter\@firstoftwo
    \else
      \expandafter\@secondoftwo
    \fi}
  \makeatother

The use of \expandafter and \relax is used to avoid messing with other
TeX conditionals.

A quick illustration is the following:

  \newcommand{\slidetest}{\iffirstslide{first}{rest}}
  \begin{document}
  
  \overlays{3}{%
    \begin{slide}{Foo}
      \slidetest
    \end{slide}}
  
  \begin{slide}{Bar}
    \slidetest
  \end{slide}

I hope this works.

/Peter
-- 
http://www.linearity.org/turtle/contact.html 
``If we're an arrogant nation, they'll resent us.
If we're a humble nation but strong, they'll welcome us.''--George W. Bush


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