Uncontinuous curves

[Nicolas FRANCOIS]

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Hi. I would like to draw scale functions with discontinuities, using lines
with a half-circle at the end. How should I replace the >-< option to
achieve this ?

Example :

\documentclass{article}
\usepackage{PStricks}
\begin{document}
   \begin{tabular}{p{8cm}p{8cm}}
     \begin{pspicture}(8,5)
     \psline{->}(0.5,2.5)(7.5,2.5)
     \psline{->}(4,0.5)(4,4.5)
     \psline[linewidth=0.5mm]{-<}(0.5,0.93)(4,0.93)
     \psline[linewidth=0.5mm]{>-}(4,4.07)(7.5,4.07)
     \psdots[dotstyle=*,dotsize=4pt 2](4,2.5)
     \rput(3.7,4.07){$\frac{\pi}{2}$}
     \rput(4.3,0.93){$-\frac{\pi}{2}$}
     \end{pspicture}
    &
     \begin{pspicture}(8,5)
     \psline{->}(0.5,1)(7.5,1)
     \psline{->}(4,0.5)(4,4.5)
     \psline[linewidth=0.5mm]{-<}(0.5,1)(2,1)
     \psline[linewidth=0.5mm]{>-}(6,1)(7.5,1)
     \psline[linewidth=0.5mm]{>-<}(2,4.14)(6,4.14)
     \psdots[dotstyle=*,dotsize=4pt 2](2,2.5)(6,2.5)
     \rput(4.3,2.5){$\frac{\pi}{4}$}
     \rput(4.3,4.5){$\frac{\pi}{2}$}
     \end{pspicture}
   \end{tabular}
\end{document}

(hope it works well !)




\bye

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         Nicolas FRANCOIS (nicofran at club-internet.fr)
       http://perso.club-internet.fr/nicofran/index.htm
We are Micro$oft. Resistance is futile. You wil be assimilated.
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