[texhax] arithmetic in pstricks coordinates

[Brandon Kuczenski]

Hello all,

Is it possible to use arithmetic inside of PStricks coordinates? for 
example, something like:

...
\def\boxsize{1.4}
...
\begin{pspicture}(0,0)(10,10)
\psframe(4,5)(6,5 + \boxsize)
...
\end{pspicture}
...

Thanks for any suggestions,
-Brandon