[pstricks] Probably a bug in \nodexn

[Donut E. Knot]

The issue still exists even without pscustom. So what is misleading me now? :-)

\documentclass{minimal}

\usepackage{pst-eucl}
\psset{saveNodeCoors}

\def\xy#1{!N-#1.x N-#1.y}
\begin{document}
\begin{pspicture}[showgrid](-3,-1)(3,3)
\pstGeonode
(2,0){A}
(2,2){B}
%(!N-A.x N-B.x add 4 div N-A.y N-B.y add 4 div 2.5 add){C}
\nodexn{.25(A)+.25(B)+(0,2.5)}{C'}% does not work
\pstGeonode(C'){C}% does not work
  \psline(\xy{A})(\xy{B})(\xy{C})
\end{pspicture}
\end{document}

Stiff Jokes




On Monday, December 30, 2013 6:45 AM, Michael Sharpe <msharpe at ucsd.edu> wrote:
 

On Dec 29, 2013, at 3:21 PM, Donut E. Knot <the.counterterrorist at yahoo.com> wrote:

> Dear folks,
> 
> I noticed \nodexn behaves abnormally as the following code represents. When C is constructed via \nodexn, it becomes rendered outside the canvas. 
> 
> \documentclass[pstricks,border=12pt]{standalone}
> 
> \usepackage{pst-eucl}
> \psset{saveNodeCoors}
> 
> \begin{document}
> \begin{pspicture}[showgrid](-3,-1)(3,3)
>     \pstGeonode
>         (2,0){A}
>         (2,2){B}
>         (!N-A.x N-B.x add 4 div N-A.y N-B.y add 4 div 2.5 add){C}
> 
>     
> %\nodexn{.25(A)+.25(B)+(0,2.5)}{C'}% does not work
>     %\pstGeonode(C'){C}% does not work
>     \def\common{\psline(!N-A.x N-A.y)(!N-B.x N-B.y)(!N-C.x N-C.y)}%
>     \pscustom
>     {
>         \common
>         \reversepath
>     
>     
> \scale{-1 1}
>         \common
>         \closepath
>     }
> \end{pspicture}
> \end{document}
> 
> 
> Thank you in advance.
> 
> 
> Best regards,
> 
> Stiff Jokes
> (http://tex.stackexchange.com/users/19356)
> _______________________________________________

Use the \shownode macro to trace the calculations: When I uncomment \nodexn and the following line, I get the correct points:
Node A: (2.0, 0.0)
Node B: (2.0, 2.0)
Node C': (1.0, 3.0)
Node C: (1.0, 3.0)

I seems to be your pscustom block that's misleading you, not a bug in \nodexn.

Michael
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