Doubleline intersection

[Denis Girou]

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>>>>> "Michael.Bech" == Michael M Bech <mmb at iet.auc.dk> writes:

    Michael.Bech> For some block diagrams in control theory I need draw a lot of node
    Michael.Bech> connections with [doubleline=true]. A sample diagram is here:

    Michael.Bech>   |--------|                    \ |---------|
    Michael.Bech>   |        |---------------------\|         |
    Michael.Bech>   |   A    |----------   --------/|    C    |
    Michael.Bech>   |        |          | |       / |         |
    Michael.Bech>   |--------|          | |         |---------|
    Michael.Bech>                       | |
    Michael.Bech>   |--------| /        | |
    Michael.Bech>   |        |/---------  |
    Michael.Bech>   |   B    |\-----------| 
    Michael.Bech>   |        | \          
    Michael.Bech>   |--------|          

    Michael.Bech> The node connections are made by:
              
    Michael.Bech> \ncline[doubleline=true]{->}{A}{C}%
    Michael.Bech> \ncbar[doubleline=true, armA=0.5cm]{->}{A}{B}%

    Michael.Bech> Now, the problem is the intersection point of the double lines:
    Michael.Bech> I get something like this

    Michael.Bech>   |--------|                    \ |---------|
    Michael.Bech>   |        |----------|-|--------\|         |
    Michael.Bech>   |   A    |----------| |--------/|    C    |
    Michael.Bech>   |        |          | |       / |         |
    Michael.Bech>   |--------|          | |         |---------|

    Michael.Bech> but I would like the intersection to be "open" as shown in the first figure.

  I clearly don't think that it can be done directly, but "with some
experience and wiliness" it is rather easy to obtain (special care must be
taken to arrows, to keep them correct). Remember that in PostScript you can
always override some parts of previous results by usage of new commands
executed later. In some cases, it is a very useful and powerful technique.

\documentclass{article}

\usepackage{pst-node}

\pagestyle{empty}

\begin{document}

\begin{psmatrix}[mnode=r,colsep=5,rowsep=3]
  [name=A] \psframebox{\Huge A} & [name=C] \psframebox{\Huge C} \\[0pt]
  [name=B] \psframebox{\Huge B}
\end{psmatrix}

\psset{doubleline=true,doublesep=0.2,arrows=->}
\ncline{A}{C}
\ncbar[armA=2]{A}{B}
\ncline[linewidth=0,doublecolor=white,arrows=-,nodesepB=1]{A}{C}

\end{document}

D.G.

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