From b4fc5f639874db951177ec539299d20908adb654 Mon Sep 17 00:00:00 2001
From: Karl Berry <karl@freefriends.org>
Date: Mon, 9 Jan 2006 00:44:40 +0000
Subject: doc 4

git-svn-id: svn://tug.org/texlive/trunk@80 c570f23f-e606-0410-a88d-b1316a301751
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+%%
+%% This is file `pp4sldemo.tex',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% texpower-doc.dtx  (with options: `pp4sldemo')
+%% 
+%% --------------------------------------------------------------
+%% 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{pp4sldemo.tex}%
+      [2004/07/27 TeXPower example file]
+%-----------------------------------------------------------------------------------------------------------------
+% File: pp4sldemo.tex
+%
+% Simple examples the for combining the foils class with the pp4slide package and the dynamic features provided by the
+% package texpower.sty.
+%
+%-----------------------------------------------------------------------------------------------------------------
+% Autor: Stephan Lehmke <Stephan.Lehmke@cs.uni-dortmund.de>
+%
+% v0.0.1 May 25, 2000: First version for the pre-alpha release of TeXPower.
+%
+
+\documentclass[landscape]{foils}
+
+\usepackage{pp4slide}
+
+%-----------------------------------------------------------------------------------------------------------------
+% The texpower package is loaded.
+% We give the display option so dynamic features are enabled.
+% As pp4slide sets some colors designed for dark backgrounds, we give the darkbackground option, and colormath to make
+% formulae colored.
+%
+\usepackage[display,darkbackground,colormath]{texpower}
+
+
+\begin{document}
+
+\title{The \code{texpower} Package\\{\normalfont \texttt{pp4slide} Demo}}
+\author{Stephan Lehmke\\\code{mailto:Stephan.Lehmke@cs.uni-dortmund.de}}
+\maketitle
+
+
+\foilhead{A list environment}
+
+% The \pause command `splits' the current page at the place it appears, producing two pages, one with everything which
+% came before the \pause command, one containing this and additionally the stuff coming after \pause. When these pages
+% are presented with acrobar reader in full screen mode (or any other viewer with this capability), the presentation
+% will appear to `stop' at the point the \pause command was issued and `resume' in the moment the presenter switches to
+% the next page.
+
+\pause
+
+% As \pause forces a paragraph break, it can not be used to separate a description label from the associated text. For
+% this, we use the (very flexible) \stepwise command. Inside the argument of \stepwise, an arbitrary number of \step
+% commands may occur. \stepwise will produce as many pages as there are \step commands, making the arguments of the
+% \step commands appear ``one by one''.
+
+\stepwise
+{%
+  \begin{description}
+  \item[foo.] \step{bar.}
+  \step{\item[baz.]} \step{qux.}
+  \end{description}
+  }
+
+
+
+\foilhead{An aligned equation}
+
+\pause
+
+% Normally for \stepwise, if a \step is not yet active, its argument is ignored completely. This would disturb
+% alignments, because the width changes with every new activated \step.
+% \parstepwise is a variant of \stepwise where the argument of an inactive \step is put into a \phantom, leaving the
+% proper amount of white space.
+
+\parstepwise
+{%
+  % Using eqnarray with equation numbers here means all equation numbers will be visible from the outset, because only
+  % the contents of the lines are `filled in'. See the full demo for an example of aligned equations where equation
+  % numbers `appear'.
+  \begin{eqnarray}
+    %
+    % When the argument of \step is put into a box (as it happens with \parstepwise), tabulators can not go in there. As
+    % we want the equals sign to appear at the same time as the right side of the equation, we use \restep for the
+    % latter. \restep is like \step, but it appears at the same time as the previous \step command.
+    %
+    \sum_{i=1}^{n} i & \step{=} & \restep{1 + 2 + \cdots + (n-1) + n}\\
+    %
+                     & \step{=} & \restep{1 + n + 2 + (n-1) + \cdots}\\
+    %
+                     & \step{=} & \restep
+                                  {% We can nest \step commands inside each other. The order of execution is just the
+                                   % order of appearance, independent of nesting.
+                                   % \switch is a variant of \step which takes two arguments and toggles between them on
+                                   % activation. This way, we can make the \underbrace `appear'.
+                                   % We insert a \vphantom in the first argument so that the equation numbers will be
+                                   % placed correctly whether or not the underbrace is didplayed.
+                                    \switch
+                                    {%
+                                      \vphantom{\underbrace{(1 + n) + \cdots + (1 + n)}_{\times\frac{n}{2}}}%
+                                      (1 + n) + \cdots + (1 + n)%
+                                      }
+                                    {\underbrace{(1 + n) + \cdots + (1 + n)}_{\times\frac{n}{2}}}%
+                                    }
+                                  \\
+    %
+    % This is another nested application of \step. Note that the spacing of \cdot has to be corrected manually by
+    % inserting {} left of it, because otherwise it would behave like a prefix operator.
+    %
+                     & \step{=} & \restep{\frac{(1 + n)\step{{}\cdot n}}{\restep{2}}}
+  \end{eqnarray}
+}
+
+
+
+
+\foilhead{An array}
+
+\stepwise
+{% With arrays, beware of problems with automatic calculation of cell widths.
+ %
+ % If you want all widths to be calculated automatically, you need to use \parstepwise, with the consequence that
+ %   a) tabulators or newlines can not go into the argument of \step,
+ %   b) the array `structure' (rules) will be completely visible right from the beginning.
+ %
+ % If you want to use \stepwise for being able to build the `structure' (like \hilne's) dynamically (as done in the
+ % following), you have to make sure that the cell widths are correct from the very first line, because otherwise the
+ % array will expand horizontally, destroying the dynamic effect. This can be assured by
+ %   a) using only p cells,
+ %   b) making sure all the cells in the first line are at least as wide as the widest cell which will appear later. If
+ %      you are using the calc package, this is easiest by putting \makebox[\widthof{widest entry}]{first entry} into
+ %      the first cell. Otherwise, you can use \settowidth.
+ %
+  \begin{displaymath}
+    \begin{array}{rrrrr}
+      \step
+      {%
+            n &        \log n        &        n\log n       & \lefteqn{n^2}\phantom{25} & \lefteqn{2^n}\phantom{32} \\
+        \hline%
+        }%
+      \step{0 &} \step{\textrm{---}  &} \step{\textrm{---}  &} \step{0                  &} \step{1                  \\}%
+      \step{1 &} \step{0\phantom{.6} &} \step{0\phantom{.8} &} \step{1                  &} \step{2                  \\}%
+      \step{2 &} \step{1\phantom{.6} &} \step{2\phantom{.8} &} \step{4                  &} \step{4                  \\}%
+      \step{3 &} \step{1.6           &} \step{4.8           &} \step{9                  &} \step{8                  \\}%
+      \step{4 &} \step{2\phantom{.6} &} \step{8\phantom{.8} &} \step{16                 &} \step{16                 \\}%
+      \step{5 &} \step{2.3           &} \step{11.6          &} \step{25                 &} \step{32                   }%
+    \end{array}
+  \end{displaymath}
+}
+
+
+
+
+\foilhead{A picture}
+
+\pause
+
+\begin{center}%
+  \stepwise
+  {%
+    \setlength{\unitlength}{1.6cm}%
+    \delimitershortfall-1sp% Just for the nested braces
+    \begin{picture}(14,2)
+      \put(0,1){\vector(1,0){1}}
+      \put(0.5,0.5){\makebox(0,0){\small $x(t)$}}
+      \put(13,1){\vector(1,0){1}}
+      \put(13.5,0.5){\makebox(0,0){\small $y(t)$}}
+      \step
+      {
+        \put(1,1){\line(3,2){1.5}}
+        \put(1,1){\line(3,-2){1.5}}
+        \put(2.5,0){\line(0,1){2}}
+        \put(2,1){\makebox(0,0){\large $\varphi$}}
+        }
+      \step
+      {
+        \put(2.5,1){\vector(1,0){3.5}}
+        \put(4.25,0.5){\makebox(0,0){\small $F_t = \varphi\left(x(t)\right)$}}
+        }
+      \step
+      {
+        \put(6,0){\framebox(2,2){\large $\Phi$}}
+        }
+      \step
+      {
+        \put(8,1){\vector(1,0){3.5}}
+        %
+        % Here, we find another nested use of \step inside \step.
+        % \bstep is a variant of \step which _always_ puts its argument into a box for leaving the correct amount of
+        % white space. We cannot use \parstepwise here because \put can't go into a box. Hence, just using \step for
+        % building the nested formula on the next line would give the wrong size for the nested braces.
+        %
+        \put(9.75,0.5){\makebox(0,0){\small $G_t = \Phi\left(\bstep{\varphi\left(\bstep{x(t)}\right)}\right)$}}
+        }
+      \step
+      {
+        \put(13,1){\line(-3,2){1.5}}
+        \put(13,1){\line(-3,-2){1.5}}
+        \put(11.5,0){\line(0,1){2}}
+        \put(12,1){\makebox(0,0){\large $\delta$}}
+        }
+    \end{picture}%
+    }%
+\end{center}%
+\end{document}
+\endinput
+%%
+%% End of file `pp4sldemo.tex'.
-- 
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