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diff --git a/Master/texmf-dist/doc/latex/texpower/bckwrdexample.tex b/Master/texmf-dist/doc/latex/texpower/bckwrdexample.tex new file mode 100644 index 00000000000..09153a30d7f --- /dev/null +++ b/Master/texmf-dist/doc/latex/texpower/bckwrdexample.tex @@ -0,0 +1,149 @@ +%% +%% This is file `bckwrdexample.tex', +%% generated with the docstrip utility. +%% +%% The original source files were: +%% +%% texpower-doc.dtx (with options: `bckwrdexample,bckwrdexample-src,end') +%% +%% -------------------------------------------------------------- +%% TeXPower bundle - dynamic online presentations with LaTeX +%% Copyright (C) 1999-2004 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. +%% -------------------------------------------------------------- +%% +%% The list of all files belonging to the TeXPower bundle is +%% given in the file `00readme.txt'. +%% +\ProvidesFile{bckwrdexample.tex}% + [2004/07/27 TeXPower example file] +%----------------------------------------------------------------------------------------------------------------- +% File: bckwrdexample.tex +% +% Backwards writing example for the package texpower.sty. +% +% This file can be compiled with pdfLaTeX or (standard) LaTeX. When using standard LaTeX, the dvi file produced should +% be processed with +% +% dvips -Ppdf -j0 bckwrdexample +% +% afterwards processing the resulting ps file with +% +% distill bckwrdexample.ps +% +% (The syntax is for a unix system with tetex 1.0 and distiller 3. Modify appropriately for other configurations.) +% +% The resulting pdf file is meant for presenting `interactively' with Adobe Acrobat Reader. +% +%----------------------------------------------------------------------------------------------------------------- +% Autor: Stephan Lehmke <Stephan.Lehmke@cs.uni-dortmund.de> +% +% v0.0.1 Mar 20, 2000: First version for the pre-alpha release of TeXPower. +% +% v0.0.2 Apr 26, 2000: Some small changes in preparation of the update to TeXpower v0.0.7. +% +% v0.0.3 May 18, 2000: New file name to avoid confusion with ``background''. +% +%----------------------------------------------------------------------------------------------------------------- +% Set background color to black and use slifonts. + +\PassOptionsToPackage{blackbackground}{texpower} +\RequirePackage{tpslifonts} + +% Input the generic preamble. + +\input{__TPpreamble} +\hypersetup{pdftitle={texpower backwards writing example}} + +% Define \includegraphics for including an mps (metapost postscript) image. +\usepackage{graphicx} +% The mps extension isn't supported out-of-the-box for latex+dvips +\ifthenelse{\boolean{psspecialsallowed}}{% +\DeclareGraphicsExtensions{.mps}}{} + +%----------------------------------------------------------------------------------------------------------------- +% Finally, everything is set up. Here we go... +% +\begin{document} +\begin{slide} + + %----------------------------------------------------------------------------------------------------------------- + % + \makeslidetitle{\macroname{stepwise} Example: Writing Backwards}\label{Sec:ExBackwards} + % + % The following example doesn't really demonstrate a useful application. Its purpose is twofold: + % a) Show how the functionality of \stepwise can be extended by the user by referring to the macros provided by the + % package. + % b) Show that \steps can appear in any order, and can be made to appear simultaneously in several places (and mention + % the problems this raises). + + % We define a new macro \backstep which will call \step, but the steps will be executed in _reverse_ order. + % This is achieved as follows: + % * We refer to the counter totalsteps, which gives the total number of steps occurring in this argument of + % \stepwise. + % * From this, we subtract the value of the counter stepcommand, which gives the number of this \step command (in the + % order of appearance). + % * The result is compared with the counter step, which gives the number of the current step. + % (the default for `triggering' a \step is the condition \value{step}=\value{stepcommand}) + % + % Note that if the ifthen Package would support this syntax, we could use the bracketed optional argument of \step (as + % in the previous example), defining \backstep like this: + % + % \newcommand{\backstep}{\step[\value{totalsteps}-\value{stepcommand}+1=\value{step}]} + % + % As \ifthenelse doesn't offer this syntax, we have to calculate \value{totalsteps}-\value{stepcommand}+1 in a separate + % counter. This doesn't fit the intended use of \step's optional argument. But hey, there is another syntax ;-) + % If the optional argument is specified with braces (...), then it can contain an arbitrary test which takes two + % arguments and selects the first if it succeeds and the second if it fails. We use this variant here. + % + \newcounter{reversestepno}% + \newcommand{\backstep}{\step(\setcounter{reversestepno}{\value{totalsteps}-\value{stepcommand}+1}\ifthenelse{\value{step}=\value{reversestepno}})}% + % + % We use the custom command \parstepwise which not only wraps the whole argument of \stepwise into a minipage (because + % otherwise vertical spacing goes haywire, don't ask me why), but also gives substance to steps. + % + % If the following \stepwise command would only contain the calls to \backstep, everything would be fine. + % But we _had_ to add something else.... + % In the second part of this application of \stepwise, several steps are executed simultaneously with those executed + % backwards in the first part. This means the value of the counter totalsteps is 14, i.e. the calls to \backstep + % correspond to steps 8...14. To remedy this, we decree that the first step performed shall be number 7, by setting + % the counter firststep accordingly in the optional argument of \stepwise. + % + \parstepwise[\setcounter{firststep}{\value{totalsteps}/2+\value{firststep}}] + {% + \begin{quote} + \Huge + \backstep{Is} \backstep{now} \backstep{it} + \backstep{backwards} \backstep{write} \backstep{to} + \backstep{possible\,!} + + \bigskip + + % By determining explicitly the times at which the following steps are executed, we make them appear + % simultaneously with the preceding flock of \backsteps. As we have set the counter firststep to 7, we start + % counting with 8. + % + \step[\value{step}=8]{\includegraphics[width=2cm]{fig-1}} + \step[\value{step}=9]{\includegraphics[width=2cm]{fig-1}} + \step[\value{step}=10]{\includegraphics[width=2cm]{fig-1}} + \step[\value{step}=11]{\includegraphics[width=2cm]{fig-1}} + \step[\value{step}=12]{\includegraphics[width=2cm]{fig-1}} + \step[\value{step}=13]{\includegraphics[width=2cm]{fig-1}} + \step[\value{step}=14]{\includegraphics[width=2cm]{fig-1}}% + \end{quote} + }% + \newslide +\end{slide} +\end{document} +\endinput +%% +%% End of file `bckwrdexample.tex'. |