# [texhax] Producing text and math in a 'spiral shape'

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 %%%

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