[OS X TeX] set difference using TikZ and beamer
Alain Matthes
alain.matthes at mac.com
Fri Mar 20 19:11:21 CET 2009
Le 20 mars 09 à 18:54, Alain Matthes a écrit :
>
> Le 20 mars 09 à 18:22, Art Werschulz a écrit :
>
>> Hi.
>>
>> I'm trying to do a slide that contains a Venn diagram and some
>> commentary. I found Til's Venn diagram example at
>> http://www.texample.net/tikz/examples/venn-diagram
>> and I'm trying to somewhat blindly modify same.
>>
>> Here's the code for such a page:
>>
>> couic ...
>>
>> Unfortunately, the diagram starts way too low on the page. As a
>> result, the last two lines of text don't appear on the slide.
>>
>> Any ideas on how to fix? Thanks.
>
>
> Hi,
>
>
> \clip \circleA (-2,-2) rectangle (4,4);
> |
> |
> |-----> \clip \circleA (-2,-2) rectangle (4,2);
An interesting example :
% Animate a set intersection operation.
% Standalone version contributed by Alexander Grahn
\documentclass{beamer}
\usepackage{tikz}
\usepackage{animate}
\usepackage{fp}
% parameterized tikz graphics
\newcommand{\intersect}[1]{%
\def\setA{(0,0) circle (1)}%
\def\setB{(#1,0) circle (1)}%
% define the bounding box
\def\boundb{(-2,2) rectangle (4,-2)}%
%
\begin{tikzpicture}
\draw \boundb;
% intersection
\begin{scope}
\clip \setA;
\fill[black!20] \setB;
\end{scope}
\begin{scope}[even odd rule]% first circle without the second
\clip \setB \boundb;
\fill[red!20] \setA;
\end{scope}
\begin{scope}[even odd rule]% first circle without the second
\clip \setA \boundb;
\fill[blue!20] \setB;
\end{scope}
\draw \setA;
\draw \setB;
\node at (-1,0) [left] {$A$};
\node at (#1+1,0) [right] {$B$};
\node at (4,2) [below left] {$A\cap B$};
\end{tikzpicture}
}
\begin{document}
\begin{frame}
\frametitle{Set intersection}
\begin{center}
\begin{animateinline}[autoplay,palindrome]{12}
%first frame, xb=0.0
\gdef\xb{0}% xb initial value
\intersect{\xb}%
%remaining frames, xb=0.1...2.1
\whiledo{\lengthtest{\xb pt < 2.1pt}}{%
\newframe
\FPeval{xb}{\xb+0.1}% new xb
\xdef\xb{\xb}% make \xb global
\intersect{\xb}%
}%
\end{animateinline}
\end{center}
\end{frame}
\end{document}
Regards
Alain Matthes
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