[pstricks] Using \@ifnextchar in node definition

[Christoph Bersch]

Herbert Voss schrieb:
> Am 11.11.2009 13:37, schrieb Christoph Bersch:
> 
>> how can I use commands that use \@ifnextchar to build node names? The
>> following does not work:
> 
> PSTricks checks the first character of the coordinates to decide what
> kind of values are present. For nodes it compares the catcode of "a"
> with the first character of the argument. If it is the same catcode, it
> must be a node. This doesn't work with your \mynode, because it has
> another catcode than "a"

But then using raw coordinates or constructing the trailing part of the 
name should work, but it does not:

\documentclass{article}
\usepackage{pst-node}
\SpecialCoor
\makeatletter
\def\mynode{%
    \@ifnextchar[{\mynode at i}{\mynode at i[]}
}%
\def\mynode at i[#1]#2{%
    #2%
}%
\makeatother
\begin{document}
\begin{pspicture}(5,5)
    \pnode(2,2){A}
    \makeatletter
    \psdot(! \pst at nodedict N@\mynode{A} GetCenter \tx at UserCoor end)
    \makeatother
    %
    \pnode(1,1){AA}
    \psdot(A\mynode{A})
\end{pspicture}
\end{document}

Both variants give me the error
! Use of \psdot at ii doesn't match its definition.


Thank you,
Christoph