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-% BEGIN semlayer.doc
-%%
-\def\fileversion{1.0}
-\def\filedate{93/04/01}
-%%
-%% LaTeX style option `semlayer.sty'.
-%% For use with LaTeX v2.09 and the `seminar' document style.
-%%
-%% COPYRIGHT 1993, by Timothy Van Zandt, Timothy.VAN-ZANDT@insead.edu
-%%
-%% This file may be distributed and/or modified under the conditions of
-%% the LaTeX Project Public License, either version 1.2 of this license
-%% or (at your option) any later version. The latest version of this
-%% license is in:
-%%
-%% http://www.latex-project.org/lppl.txt
-%%
-%% and version 1.2 or later is part of all distributions of LaTeX version
-%% 1999/12/01 or later.
-%%
-%%
-% **************************************************************************
-% This is `semlayer.doc', which contains the documented code for
-% `semlayer.sty'. You can use it in this form as the input file
-% `semlayer.sty'. You can also create a stripped input file using
-% sem-make.tex. You can print the documented code using sem-code.tex.
-% sem-make.tex and sem-code.tex are distributed with seminar.sty.
-% **************************************************************************
-%
-% \EndDocPreamble
-%
-% \CheckSum{276}
-% \CharacterTable
-% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
-% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
-% Digits \0\1\2\3\4\5\6\7\8\9
-% Exclamation \! Double quote \" Hash (number) \#
-% Dollar \$ Percent \% Ampersand \&
-% Acute accent \' Left paren \( Right paren \)
-% Asterisk \* Plus \+ Comma \,
-% Minus \- Point \. Solidus \/
-% Colon \: Semicolon \; Less than \<
-% Equals \= Greater than \> Question mark \?
-% Commercial at \@ Left bracket \[ Backslash \\
-% Right bracket \] Circumflex \^ Underscore \_
-% Grave accent \` Left brace \{ Vertical bar \|
-% Right brace \} Tilde \~}
-%
-%
-% \section{Overlays}
-%
-% The main thing that the "\process@slide" macro does is successively send the
-% main slide and then each overlay and layer to a slide output routine. In
-% order to make the definition of that macro easier to understand, we first
-% set up the overlays interface.
-%
-% Overlays must be implemented by some extra macros, such as in
-% "semcolor.sty". Specifically, the commands "\@overlay" and "\make@overlay"
-% should be defined.
-%
-% The reason for including the interface in "seminar.sty" is to encourage
-% those who implement overlays to use a uniform interface, and to illustrate
-% how overlays work. To be honest, though, it may not be possible to implement
-% overlays without PostScript or a graphics language with similar capabilities
-% using the interface that is defined here and without rewriting the basic
-% slides macros.
-%
-% This system of overlays is so good and the system using invisible fonts is
-% so lousy, that no special provisions have been made for supporting the
-% latter. Actually, overlay should (and could easily) be implemented as \TeX{}
-% primitives, saving everyone a lot of trouble.
-%
-% The system for overlays is not explained here in great detail. See
-% "semcolor.sty" and "pstricks.tex" for an example of how overlays can be
-% implemented.
-%
-% \begin{macrocode}
-\addto@hook\before@newslide{%
- \global\def\overlay@list{}%
- \setcounter{overlay}{0}}
-% \end{macrocode}
-%
-% \begin{macro}{\process@slide,\overlay@loop,\layer@loop}
-% "\process@slide" is the beginning of the ``output'' routine for slides.
-% "\@slidebox" is copied to "\@@slidebox". The "\make@overlay#1" macro should
-% set "\@slidebox" to the contents of "\@@slidebox", but with only the
-% material for overlay "#1" visible.
-% \begin{macrocode}
-\newbox\@@slidebox
-\def\process@@slide{%
- \ifx\overlay@list\@empty
- \finish@slide
- \output@slide
- \else
- \setbox\@@slidebox\box\@slidebox
- \make@overlay{0}%
- \finish@slide
- \output@slide
- {\let\theoverlay\theslide\layer@loop{0}}%
- \overlay@loop
- \fi}
-\def\overlay@loop{%
- \begingroup
- \overlay@prep
- \c@overlay=1
- \@whilenum\c@overlay<10
- \do{%
- \test@member{\the\c@overlay}{\overlay@list}%
- \if@test
- \make@overlay{\the\c@overlay}%
- \finish@slide
- \output@slide
- \fi
- \layer@loop{\the\c@overlay}%
- \advance\c@overlay by 1}%
- \endgroup}
-\def\layer@loop#1{%
- \begingroup
- \layer@prep
- \@for\currlayer:=\layer@list\do{%
- \test@member{#1-\currlayer}{\overlay@list}%
- \if@test
- \make@overlay{#1-\currlayer}%
- \finish@slide
- \output@slide
- \fi}%
- \endgroup}
-% \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\layer@prep,\overlay@prep}
-% \begin{macrocode}
-\def\layer@prep{%
- \ifarticle\pagestyle{\layer@pagestyle}\fi
- \let\thepage\thelayer
- \ifx\thelayerframe\@empty\else\let\theslideframe\thelayerframe\fi
- \let\slidelabel\layerlabel}
-\def\overlay@prep{%
- \ifarticle\pagestyle{\overlay@pagestyle}\fi
- \let\thepage\theoverlay
- \ifx\theoverlayframe\@empty\else\let\theslideframe\theoverlayframe\fi
- \let\slidelabel\overlaylabel}
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\layerframe,\overlayframe}
-% \begin{macrocode}
-\def\layerframe{\@slideframe{layer}}
-\def\overlayframe{\@slideframe{overlay}}
-\def\thelayerframe{}
-\def\theoverlayframe{}
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\overlaylabel,\layerlabel}
-% \begin{macrocode}
-\def\overlaylabel{\bf Overlay \theoverlay}
-\def\layerlabel{\bf Layer \thelayer}
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\theoverlay,\thelayer}
-% \begin{macrocode}
-\newcounter{overlay}
-\def\theoverlay{\theslide-\alph{overlay}}
-\def\currlayer{}
-\def\thelayer{\theoverlay-\currlayer}
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\ifoverlays,\iflayers}
-% Overlays and layers can be turned on and off independently.
-% \begin{macrocode}
-\newif\ifoverlays
-\newif\iflayers
-\@ifundefined{@overlay}%
- {\let\@overlay\relax}%
- {\ifarticle\else\overlaystrue\layerstrue\fi}
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\nooverlays@err,\@overlay}
-% "\@overlay" is set to "\relax" if it is not defined, for easy error
-% detection.
-% \begin{macrocode}
-\def\nooverlays@err{%
- \@seminarerr{You need to use additional macros for overlays,
- e.g., semcolor.sty}\@ehd
- \global\overlaysfalse
- \global\layersfalse}
-\@ifundefined{@overlay}{}{}
-% \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\overlay}
-% The "\overlay" command starts by checking that the argument is a number
-% between 0 and 9. If so, "\@overlay" is invoked. Except for overlay 0, the
-% counter for cross-references is set to "overlay", and its value is set to
-% the argument of "\overlay".
-% \begin{macrocode}
-\def\overlay#1{%
- \ifoverlays\ifx\@overlay\relax\nooverlays@err\fi\fi
- \ifslide
- \@tempcnta=#1
- \@testfalse
- \ifnum\@tempcnta>-1 \ifnum\@tempcnta<10 \@testtrue\fi\fi
- \if@test
- \c@overlay=\@tempcnta
- \ifnum\c@overlay=0
- \advance\c@slide by -1
- \refstepcounter{slide}%
- \else
- \advance\c@overlay by -1
- \refstepcounter{overlay}%
- \ifoverlays
- \xdef\overlay@list{\overlay@list,\the\c@overlay}%
- \fi
- \fi
- \ifoverlays
- \@overlay{\the\c@overlay}%
- \fi
- \else
- \@seminarerr{\string\overlay\space argument must be
- an integer between 0 and 9}\@eha
- \fi
- \else
- \@seminarerr{\string\overlay\space can only be used
- in slide environments}\@eha
- \fi
- \ignorespaces}
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\colorlayers}
-% Color layers use the same mechanism as overlays; only the interface differs.
-% \begin{macrocode}
-\def\colorlayers#1{%
- \edef\@tempc{#1}%
- \edef\layer@list{\layer@list,#1}%
- \def\@tempa##1{%
- \@namedef{##1}{%
- \iflayers\ifx\@overlay\relax\nooverlays@err\fi\fi
- \ifslide
- \iflayers
- \xdef\overlay@list{\overlay@list,\the\c@overlay-##1}%
- \@overlay{\the\c@overlay-##1}%
- \fi
- \else
- \@seminarerr{Color layer `##1' can only be used in
- slide environments}\@eha
- \fi}}
- \@for\@tempb:=\@tempc\do{%
- \expandafter\@tempa\expandafter{\@tempb}}}
-\def\layer@list{}
-% \end{macrocode}
-% \end{macro}
-%
-%
-% \begin{macro}{\layerpagestyle,\overlaypagestyle}
-% \begin{macrocode}
-\def\overlaypagestyle#1{\@ifgoodps{#1}{\edef\overlay@pagestyle{#1}}}
-\def\layerpagestyle#1{\@ifgoodps{#1}{\edef\layer@pagestyle{#1}}}
-\overlaypagestyle{}
-\layerpagestyle{}
-% \end{macrocode}
-% \end{macro}
-%
-\endinput
-% END semlayer.doc