A simple \ncloop question...

[Denis Girou]

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>>>>> "Christophe.Jorssen" == Christophe JORSSEN <Christophe.JORSSEN at wanadoo.fr> writes:

    Christophe.Jorssen> Thank you for your answers. It wasn't as simple as I thought...

    Christophe.Jorssen> However, I have another question. Look at the position of the label in those
    Christophe.Jorssen> two cases. Can somebody explain why there is a difference?

    Christophe.Jorssen> \documentclass{article}

    Christophe.Jorssen> \usepackage{pst-node}

    Christophe.Jorssen> \pagestyle{empty}

    Christophe.Jorssen> \begin{document}

    Christophe.Jorssen> \psset{nodesep=3pt,nrot=:U}

    Christophe.Jorssen> \psframebox[framesep=0]{%
    Christophe.Jorssen> \begin{pspicture}(-1,-1)(1,1)
    Christophe.Jorssen>     \rnode{B}{\psframebox{On a actionn\'e $k_1$}}
    Christophe.Jorssen>     \ncangles[angleA=90,angleB=180,arm=0.5,linearc=.2]{->}{B}{B}
    Christophe.Jorssen>     \nbput{\rotatedown{\tiny$k_1=1$ et $k_2=0$}}
    Christophe.Jorssen> \end{pspicture}}

    Christophe.Jorssen> \psframebox[framesep=0]{%
    Christophe.Jorssen> \begin{pspicture}(-1,-1)(1,1)
    Christophe.Jorssen>     \rnode{B}{\psframebox{On a actionn\'e $k_1$}}

    Christophe.Jorssen> \ncloop[angleA=90,angleB=180,loopsize=-2,armA=0.5,armB=0,linearc=.2]{->}{B}{B}
    Christophe.Jorssen>     \nbput{\rotatedown{\tiny$k_1=1$ et $k_2=0$}}
    Christophe.Jorssen> \end{pspicture}}

    Christophe.Jorssen> \end{document}

  To have the same result, you must code for the second one:

\nbput[npos=1.5]{\rotatedown{\tiny$k_1=1$ et $k_2=0$}}

  This is because \ncangles is a 4 segments macro, when \ncloop is a
5 segments one (even when you suppress one of them as you do!), and
the npos parameter is 1.5 for \ncangles and 2.5 for \ncloop.

  See documentation page 21 (betadoc1).


  P.S. Of course, this is not because the answer is in the documentation
that such questions can't be asked here. As everybody know, PSTricks is
very rich, but complex too, and it is not only difficult to have all his
aspects in mind, but also sometimes to know which characteristics influence
the behaviour, even when we have read the documentation several times.
So, such questions could help other people too.

D.G.


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