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%%
%% This is file `foilsdemo.tex',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% texpower-doc.dtx (with options: `foilsdemo')
%%
%% --------------------------------------------------------------
%% TeXPower bundle - dynamic online presentations with LaTeX
%% Copyright (C) 1999-2004 Stephan Lehmke
%% Copyright (C) 2003-2005 Hans Fredrik Nordhaug
%%
%% 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{foilsdemo.tex}%
[2005/04/07 TeXPower example file]
%-----------------------------------------------------------------------------------------------------------------
%
% Simple examples the for combining the foils class with the dynamic features provided by the package texpower.sty.
%
%-----------------------------------------------------------------------------------------------------------------
\documentclass[landscape]{foils}
% foils understands the landscape option, but to get it through to pdflatex, we need to set \pdfpageheight etc. The
% package fixseminar does this.
\usepackage{fixseminar}
%-----------------------------------------------------------------------------------------------------------------
% The texpower package is loaded.
% We give the display option so dynamic features are enabled.
%
\usepackage[display]{texpower}
\begin{document}
\title{The \code{texpower} Package\\{\normalfont \texttt{foils} 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 `foilsdemo.tex'.
|
