Is it possible in PSTricks to locally shift "everything" by 0.5 to the left? For example, in the MWE below I would like to shift the "y" to the left, so that its new coordinates are (1.5,2). Of course, in this simple example, I could just alter the coordinates directly but if you have whole bunch of objects which you want to translate this is cumbersome.
\psset{xunit=1cm,yunit=1cm}
\begin{pspicture}(0,0)(5,5)
\rput(1,1){x}
\begin{<shift to left by 0.5>}
\rput(2,2){y}
\end{<shift to left by 0.5>}
\rput(3,3){z}
\end{pspicture}