[pstricks] How to rotate the label such that its base line is parallel to the bisector?

[Counter Terrorist]

Dear folks,


How to rotate the label counter clockwise such that its base line is parallel to the bisector?

\documentclass[border=0pt,pstricks]{standalone}
\usepackage{pst-eucl}
\psset{PointName=none,PointSymbol=none}
\begin{document}

\begin{pspicture}[showgrid=false](6,6)
    \pstGeonode[CurveType=polyline](1,1){A}(5,5){B}(4,1){C}
    \pstBissectBAC[linestyle=dotted,linecolor=red]{A}{B}{C}{C'}
    \pstMarkAngle[MarkAngleRadius=1.5,LabelSep=0.75]{A}{B}{C}{\tiny$180^\circ-\theta$}
\end{pspicture}

\end{document}


Thank you in advance.
best regards,

http://tex.stackexchange.com/users/9467
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