[pstricks] Glue oddity with \pstVerb

[Christoph Bersch]

Hi Michael,

Michael Sharpe schrieb:
> It appears that \pstVerb does something odd to glue suppression inside  
> a pspicture. 

As far as I understood the code, glue suppression is not an issue of the 
pspicture environment, but every macro has to care for it itself. The 
only glue-related code in the pspicture definition is the \KillGlue, 
which acts as a switch to enable or disable the functionality of 
\pst at killglue.
The problem is the line end after \def\myx{2} which is not 'killed' by 
the \pstVerb. \rput (more specifically \rput at iv) contains a 
\pst at killglue and thus gets rid of the preceeding space.

Equally do all drawing macros (like \pscircle) contain a \pst at killglue 
which is incorporated within the \begin at ...Obj macros.

However, I can't tell you, what the real difference between two 
consecutive \def's (in which case all glue is removed) and one \def and 
a \pstVerb is (the case you showed):


\documentclass{article}
\usepackage{pstricks}
\listfiles
\begin{document}
\begin{pspicture}(-.5,-.5)(6.5,6.5)
\psgrid[subgriddiv=0,griddots=10]
\def\mxx{1}
\def\myy{3}
\pscircle(2,4){1}% no displacement
\def\myx{2}
\pstVerb{ /Xcoor 2 3 mul 2 sub def }
\pscircle(4,4){1}% shifted
\end{pspicture}
\end{document}


Even if maybe not fully answering your question, I hope to clarify some 
'glueing' issues :-)

Christoph