[pstricks] problems with autoscale of psgraph

[Marco Daniel]

Hello,

in the following example I am using pscircle with the radius 1. The 
problem is that the radius is not 1 *G*.

\documentclass{article}
\parindent0pt
\pagestyle{empty}
\usepackage{pstricks-add}
\usepackage{amsmath}
\makeatletter
\newcommand{\ReDeclareMathOperator}[2]{%
    \let #1 \@undefined%
    \DeclareMathOperator{#1}{#2}
}
\makeatother
\ReDeclareMathOperator{\Re}{Re}
\ReDeclareMathOperator{\Im}{Im}
\begin{document}
\psset{xAxisLabel=\large $\Re{z}$,yAxisLabel=\large 
$i\Im{z}$,labelFontSize=$\large$}
\begin{psgraph}[ticks=x,labels=x,arrowscale=1.5]{->}(0,0)(-1.1,-1.1)(1.2,1.2){5cm}{5cm}
 \pscircle{1}
\end{psgraph}
\end{document}

Where is the problem?

regards
Marco