[texhax] Producing text and math in a 'spiral shape'
Heiko Oberdiek
heiko.oberdiek at googlemail.com
Fri Sep 14 03:20:06 CEST 2012
On Thu, Sep 13, 2012 at 10:47:02AM -0500, Iraj Kalantari wrote:
> In an exchange between Minsu Kim and Ulrike Fischer
>
> (see
> http://newsgroups.derkeiler.com/Archive/Comp/comp.text.tex/2009-07/msg00425.html
> )
>
> the focus is on how to create *text* in the shape of a spiral. (See source below.) They use the digits of Pi for text in a successful example.
>
> I tried to insert a mathematical formula bookended by $s (say $a^2 + b^2
> =c^2$) but the source does not deliver and stops with an (odd) error
> message.
>
> Is there a remedy? Is there a way to get mathematical formulas in the
> shape of a spiral?
The macros can be modified to support token groups instead of single tokens.
Then the equation can be split into token groups manually:
\documentclass{article}
\usepackage{pst-plot}
\usepackage{pst-text}
\usepackage{pstricks-add}
\begin{document}
\makeatletter
\hspace*{4cm}
\begin{pspicture}(2,2)(2,2)
% A \DoPerCharacter macro adapted from Juergen Schlegelmilch
% (posted on comp.text.tex - January 1998)
\def\DoPerCharacter#1#2#3\@nil{%
#1{#2}% #2 can be a group of tokens
\def\@tempa{#3}%
\ifx\@tempa\empty
\else
\DoPerCharacter#1#3\@nil
\fi
}
\def\PerCharacter#1#2{\DoPerCharacter#1#2{}\@nil}
% If the string ends in a group of tokens, then the curly braces
% would be stripped. The empty group before `\@nil' prevents this.
\pst at dimh=0.7pt
\def\CharacterAction#1{%
\psscalebox{1 \pst at number{\pst at dimh}}{#1}
\advance\pst at dimh by 0.04pt
}
\pstextpath{\psplot
[linestyle=none,polarplot=true,plotpoints=300,unit=5]
{500}{-500}{1 2.7182818 x 200 div exp 1 add div}}% Spiral
{\PerCharacter{\CharacterAction}{%
% 3,141592653589793238462643383279502884197169399375%
% 10582097494459230781640%
{$a$}{$\!^2$}+{$b$}{$\!^2$}={$c$}{$\!^2$}%
}}
\end{pspicture}
\end{document}
%%% test.tex %%%
Your sincerely
Heiko Oberdiek
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