[pstricks] Geradenbüschel

[Christoph Bersch]

Hi,

Hendrik Maryns schrieb:
> 
> What I like is several (say, 4), lines that go through one point, say
> (7,10) in different directions.  That would be easy if it weren’t so
> that I’d like those lines to protrude in both directions.  This is a
> thing which in projective geometry is known as a ‘Geradenbüschel’, a
> bundle of lines.
> 
> Something like this:
> http://mathenexus.zum.de/html/extemporale/11T/1/E1_A1_11TA_A11130_images/IMG0074.PNG
> 
> but without the axes.

a simple, not really soffisticated example:

\documentclass{scrartcl}
\usepackage{pstricks}
\usepackage{multido}
\SpecialCoor
\begin{document}
\begin{pspicture}(10,10)
   \rput(5,5){\multido{\ii=-20+10,\ij=-200+10}{5}{%
     \psline(3;\ii)(3;\ij)
   }}
\end{pspicture}
\bigskip

\begin{pspicture}(10,10)
   \rput(5,5){%
     \begin{psclip}{\psframe[linestyle=none](-2,-1)(2,1)}
       \multido{\ii=-20+10,\ij=-200+10}{5}{%
         \psline(3;\ii)(3;\ij)
       }%
     \end{psclip}
     }
\end{pspicture}
\end{document}

Christoph