[pstricks] cnodes and boxes

[Herbert Voss]

Francisco A. S. Grossi wrote:
> I have some nodes in a XY plane (showing a two-dimension sample space) 
> and would like to mark certain events. I was able to it with NCBOX when 
> all the relevant points are aligned. I would like to mark some points 
> but they would form a triangle; I could not find a way to do it unless I 
> specify the actual coordinates instead of refering to the cnodes names 
> (I used PSPOLYGON with the XY coordinates). Is there an easier way, 
> something like NCBOX?

you can define nodes with four "sides":
http://tug.org/PSTricks/main.cgi?file=Nodes/nodes#circle

or (not easy to understand the meaning of the parameters)

\documentclass{article}
\usepackage{pst-node}
\SpecialCoor
\begin{document}

\circlenode{a}{A}\hspace{5cm}\circlenode{b}{B}

\vspace{3cm}
\circlenode{c}{C}
\pspolygon[linestyle=dashed,linearc=0.5]%
   ([offset=1,Xnodesep=-1]a)([offset=-1.5,Ynodesep=-0.75]c)%
   ([offset=0.5,Xnodesep=2]b)

\end{document}



Herbert