[pstricks] sequence of interval

[Herbert Voss]

Am 07.02.2011 13:59, schrieb Andrzej J. Maciejewski:
> Hi, assume that you have two curves given parametrically:  t->(bx(t),by(t))
> and  t->(ex(t),ey(t)).
> I want to draw lines:
> psline(bx(t),by(t))(ex(t),ey(t))
> changing t in a loop.

that is only possible with PostScript notation:

\documentclass{article}
\usepackage{pst-plot,multido}
\SpecialCoor
\begin{document}

\begin{pspicture}(-1,-1)(5,5)
\psaxes[ticksize=0 -4pt]{->}(5,5)
\psparametricplot[algebraic,linewidth=1.5pt,linecolor=blue]{0}{5}{2*sqrt(t)|sin(t)+t}
\psparametricplot[algebraic,linewidth=1.5pt,linecolor=red]{0}{5}{2*sqrt(t)|cos(t)+t}
\multido{\rA=0.0+0.25}{20}{%
  \psline{<->}(!2 \rA\space sqrt mul
                  \rA\space RadtoDeg sin \rA\space add)
              (!2 \rA\space sqrt mul
                  \rA\space RadtoDeg cos \rA\space add)}
\end{pspicture}

\end{document}


Herbert
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