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+%%
+%% This is file `picpsexample.tex',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% texpower-doc.dtx (with options: `picpsexample')
+%%
+%% --------------------------------------------------------------
+%% 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'.
+%%
+%
+% Code for the PSTricks picture example for the package texpower.sty.
+%
+% This file is input by others. Don't compile it separately.
+%
+%-----------------------------------------------------------------------------------------------------------------
+% Autor: Stephan Lehmke <Stephan.Lehmke@cs.uni-dortmund.de>
+%
+% v0.0.1 Mar 21, 2000: First version for the pre-alpha release of TeXPower.
+%
+% v0.0.2 Apr 19, 2000: Using \bstep instead of \boxedsteps.
+%
+% v0.0.3 Apr 28, 2000: Some small changes in preparation of the update to TeXpower v0.0.7.
+%
+
+%-----------------------------------------------------------------------------------------------------------------
+%
+% This has nothing to do with \stepwise, just setting up the picture...
+%
+\newcommand{\Block}[1]
+{%
+ \begin{pspicture}(-4,-2)(4,2)
+ \pspolygon(-4,0)(-2,2)(2,2)(4,0)(2,-2)(-2,-2)
+ \rput(0,0){#1}
+ \end{pspicture}%
+ }%
+\ifthenelse{\boolean{TPcolor}}
+{\psset{unit=3mm,fillstyle=solid,fillcolor=highlightcolor,linecolor=textcolor}}%
+{\psset{unit=3mm}}%
+%
+% In the following picture, picture items are built incrementally.
+%
+% \stepwise generates a sequence of slides, all alike. The only difference ist that on every slide, one more of the
+% \step commands occurring in the argument of \stepwise are `activated'. This way the stuff inside the argument of
+% \stepwise is gone through `step by step'.
+%
+\stepwise
+{%
+ \begin{center}
+ \large
+ \begin{pspicture}(-1,-13)(33,9)
+ \rput(0,0){\rnode{x}{\fboxrule0pt\fbox{$x[t]$}}}
+ \rput(32,0){\rnode{y}{\fboxrule0pt\fbox{$y(t)$}}}
+ {%
+ % The effect of the \step command is to `hide' its argument on the first slide of the sequence generated by
+ % \stepwise and display it on all other slides of this sequence. The second \step command starts displaying on
+ % the third slide and so on...
+ %
+ % Usually `hiding' means ignoring altogehter. For the following application however, the box displayed by
+ % \step is used as an node in the picture. This means that instead of ignoring its argument, it's better if
+ % \step displays an appropriate amount of blank space.
+ % This behaviour (create blank space) is exhibited by the command \bstep.
+ \rput(4,0){\rnode{V}{\bstep{\psframebox{\Large$V$}}}}
+ \ncline{->}{x}{V}
+ %
+ % The command \rebstep allows both boxes to appear simultaneously.
+ %
+ \rput(28,0){\rnode{plus}{\rebstep{\psframebox{\Large$+$}}}}
+ }%
+ \ncline{->}{plus}{y}
+ % By using \restep again, the two boxes defining the operators appear at the same time as the first block of the
+ % diagram, which is produced by the following commands.
+ \restep
+ {%
+ % We use \afterstep{\pageTransitionDissolve} to make this first step of the diagram appear with a fancy page
+ % transition. We have to use \afterstep because the page transition setting would be undone by the group
+ % closing contained in \end{pspicture}.
+ \afterstep{\pageTransitionDissolve}%
+ \rput(16,0){\rnode{IBlk}{\Block{I-Block}}}
+ \ncline{->}{V}{IBlk}
+ \Aput{$x[t]$}
+ \ncline{->}{IBlk}{plus}
+ \Aput
+ {%
+ %
+ % Here, one use of \step is nested inside the other.
+ $%
+ % Note how the math spacing is corrected manually by adding {} after \cdot. Otherwise, \cdot wouldn't be
+ % aware that something is following and act as a postfix (instead of infix) operator.
+ % \afterstep is used again to reset the page transition to Replace for the building of the formula.
+ \bstep{\afterstep{\pageTransitionReplace}{}b\cdot{}}%
+ \bstep{\int\limits^t_0 x(\tau)\,d\tau}%
+ $%
+ }%
+ }%
+ \step
+ {%
+ \afterstep{\pageTransitionDissolve}%
+ \rput(16,6){\rnode{PBlk}{\Block{P-Block}}}
+ \ncangle[angleA=90,angleB=180,fillstyle=none]{->}{V}{PBlk}
+ \Aput{$x(t)$}
+ \ncangle[angleB=90,fillstyle=none]{->}{PBlk}{plus}
+ \aput(.5){$a\cdot x(t)$}
+ }%
+ \step
+ {%
+ \rput(16,-6){\rnode{DBlk}{\Block{D-Block}}}
+ \ncangle[angleA=-90,angleB=180,fillstyle=none]{->}{V}{DBlk}
+ \Aput{$x(t)$}
+ \ncangle[angleB=-90,fillstyle=none]{->}{DBlk}{plus}
+ \aput(.5){$\displaystyle c\cdot \left(\frac{dx}{d\tau}\right)(t)$}
+ }
+ \end{pspicture}%
+ \end{center}
+ }%
+
+% The whole execution of \stepwise is encapsuled in a group to make all changes local. This affects also the setting
+% of the page transition to dissolve in the last but one step. We set it again explicitly to make the last step appear
+% with this page transition as well.
+
+\pageTransitionDissolve
+
+\endinput
+%%
+%% End of file `picpsexample.tex'.