pstricks and calc

[Werenfried Spit]

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Wouldn't it be nice if the functionality of calc and pstricks
were integrated. So one could do stuff like
\def\leftshift{-1}
\def\rightshift{1}
\rput(1+\leftshift,0){left}
\rput(1+\rightshift,0}{right}
\rput(1+\leftshift,1){once more}
\rput(1+\rightshift,1){and again}

Alas, I tried but it didn't work. Not even wrapped up a little bit 
in a macro:

\usepackage{pstricks,calc}
\newcounter{tmpc}
\def\num#1{\setcounter{tmpc}{#1}\thetmpc}
\num{1+1}
\begin{pspicture}(5,5)
\rput(1,1){1}
\rput(1,\num{1+1}){1+1}
\end{pspicture}


leading to

! Undefined control sequence.
\calc at pre@scan ...calc at open \else \let \calc at next 
                                                  \calc at numeric \fi \calc at ne...
l.10 \rput(1,\num{1+1}){1+1}
                            
? 
! Undefined control sequence.
\GenericError  ...                                
                                                    #4  \errhelp \@err@     ...
l.10 \rput(1,\num{1+1}){1+1}
                            
? 

Is pstricks expanding the \num macro too far? Not far enough? Anyone
else tried this?
---
Werenfried Spit                            e-mail  W.Spit at witbo.nl
Witteveen+Bos Consulting Engineers         phone   +31-70-3.700.709
Den Haag, The Netherlands                  fax     +31-70-3.600.098


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