% fixseminar.sty,v 1.6 2002/11/22 15:56:40 stephanlehmke Exp
%  
% TeXPower bundle - dynamic online presentations with LaTeX
% Copyright (C) 1999-2002 Stephan Lehmke
% 
% This program is free software; you can redistribute it and/or
% modify it under the terms of the GNU General Public License
% as published by the Free Software Foundation; either version 2
% of the License, or (at your option) any later version.
% 
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
%=======================================================================================================================
% File: fixseminar.sty
%
% Fix some problems in conjunction with seminar.
%
% This package is part of the TeXPower bundle, to be found at
% 
% http://texpower.sourceforge.net/
%
% If using hyperref, load this package _after_ hyperref.
%
%=======================================================================================================================
% Author: Stephan Lehmke <Stephan.Lehmke@cs.uni-dortmund.de>
%
% v0.0.1  Mar 28, 2000 First version for the pre-alpha release of texpower and hyperref v6.70a.
%
% v0.0.1a May 18, 2000 Added a \vss to a \vbox to get rid of an `overfull vbox' message.
%
% v0.0.2  Jun 02, 2000 Now handle seminar as well as powersem.
%
% v0.0.3  Sep 07, 2000 hyperref v6.70u and later don't have the \@hyperfixhead bug any more.
%
% v0.0.4  Nov 22, 2002 Now using ifpdf package if available.
%                      As hyperref v6.70u exists for some time now, the \@hyperfixhead hack is removed.
%                      Fixed a problem with \twoup (bug found and fix proposed by Laurent Mugnier).
%                      Added a preliminary fix for rotating slides with pdftex.


\NeedsTeXFormat{LaTeX2e}

\ProvidesPackage%
{fixseminar}%
[2002/11/22 v0.0.4 Fix some problems of seminar.]


%=======================================================================================================================

\RequirePackage{ifthen}


%=======================================================================================================================
% Options and general setup.

\ProcessOptions


% The switch \ifpdf is to determine whether pdfLaTeX is being run and outputting pdf, using Heiko Oberdiek's faultproof
% pdf detector: 

\IfFileExists{ifpdf.sty}
{%
  \RequirePackage{ifpdf}%
  }
{%
  \@ifundefined{pdftrue}
  {%
  \expandafter\newif\csname ifpdf\endcsname
  \ifx\pdfoutput\undefined
   \else
    \ifx\pdfoutput\relax
     \else
      \ifcase\pdfoutput
       \else
        \pdftrue
       \fi
     \fi
   \fi
   }{}%
   }


%=======================================================================================================================
% Here come the fixes.

% We need to make sure that magnification, as used by seminar, is respected when setting \pdfpageheight and
% \pdfpagewidth. We strip the pt and add truept which respects magnification.


\ifthenelse{\boolean{pdf}}%          Are we outputting PDF?
{% Yes.
  \@ifclassloaded{seminar}%         seminar document class?
  {%
    \RequirePackage{graphics}%
    \def\leftsliderotation#1{\rotatebox{90}{#1}}%
    \def\rightsliderotation#1{\rotatebox{270}{#1}}%
    \sliderotation{left}%
  }{}%
  \AtBeginDocument%                   Then we need to set \pdfpagewidth and \pdfpageheight in a _true_ unit to make sure
  {%                                  the pdf page has the right dimensions even when magnifying (as seminar does).
    \setlength{\pdfhorigin}{1truein}% \pdfhorigin and \pdfvorigin also need to be set to true dimensions.
    \setlength{\pdfvorigin}{1truein}%
    \@ifclassloaded{seminar}%         seminar document class?
    {%
      \ifportrait%                    Portrait slides?
        \setlength{\pdfpageheight}{\strip@pt\paperheight truept}%
        \setlength{\pdfpagewidth}{\strip@pt\paperwidth truept}%
       \else%                         Landscape. Need to exchange height and width. 
        \renewcommand{\printlandscape}
        {%
          \setlength{\pdfpagewidth}{\strip@pt\paperheight truept}%
          \setlength{\pdfpageheight}{\strip@pt\paperwidth truept}%
        }%
      \fi
      }%
    {%
      \setlength{\pdfpageheight}{\strip@pt\paperheight truept}%
      \setlength{\pdfpagewidth}{\strip@pt\paperwidth truept}%
    }%
  }%
}
{% No. In this case we define \special@paper which will put an appropriate \special into the dvi file.
  \@ifclassloaded{seminar}
  {%
    \edef\special@paper{\the\paperwidth,\the\paperheight}%
    \ifportrait
     \else%                                                     Need to exchange height and width. 
      \renewcommand{\printlandscape}{\edef\special@paper{\the\paperheight,\the\paperwidth}}
    \fi
    }%
  {%
    }%
  }%


% There is a bug in old hyperref versions to the effect that apparently, when using seminar there is a glitch in
% vertical spacing. Issue a warning if hyperref is too old.

\@ifpackageloaded{hyperref}%               Looking for \@hyperfixhead bug.
{%
  \@ifpackagelater{hyperref}{2000/09/07}%  Is the \@hyperfixhead bug present in hyperref?
  {}%                                      No. 
  {%                                       Yes. Issue a warning.
    \PackageWarning{fixseminar}
    {Package hyperref too old (older than 6.70u).\MessageBreak Expect problems with seminar}%
    }%
  }{}

% Local Variables: 
% fill-column: 120
% TeX-master: "dummy"
% End: 

%%
%% End of file `fixseminar.sty'.