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

Iraj Kalantari I-Kalantari at wiu.edu
Thu Sep 13 17:47:02 CEST 2012

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?

Iraj.

=========================

\documentclass{article}
\usepackage{pst-plot}
\usepackage{pst-text}

\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%
\edef\@tempa{#3}%
\ifx\@tempa\empty
\else
\DoPerCharacter#1#3\@nil
\fi}

\def\PerCharacter#1#2{\DoPerCharacter#1#2\@nil}

\pst at dimh=0.7pt

\def\CharacterAction#1{%
\psscalebox{1 \pst at number{\pst at dimh}}{#1}

\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}}

\end{pspicture}

\end{document}

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