tabular / pstree problem

[Denis Girou]

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The following message is a courtesy copy of an article
that has been posted to comp.text.tex as well.

>>>>> "Anthony.Doggett" == adoggett  <adoggett at uiuc.edu> writes:

    Anthony.Doggett> Hi!

    Anthony.Doggett> I have a strange problem to do with putting a \pstree inside
    Anthony.Doggett> the tabular environment.

    Anthony.Doggett> If I have a table with two columns, then the top of the pstree
    Anthony.Doggett> turns out to be level with the baseline of whatever is in the
    Anthony.Doggett> other box.  (The center of tables or the bottom of other pstricks
    Anthony.Doggett> objects).

    Anthony.Doggett> How do I stop this happening?

    Anthony.Doggett> Thanks!
    Anthony.Doggett>   Anthony.

    Anthony.Doggett> (I'm using a pretty recent unix version of latex w/pstricks)

  I'm afraid that you must consider it more than a feature than a bug...
In any case, you can verify that when you put "complex" material in a tabular
cell, you loose often the exact spacing. See for instance the first next
example with a simple \shortstack macro.

  Nevertheless:

    - it is often not difficult to bypass this kind of problems by simple
add-ons introduced by hands, even if this is unpleasant to do,
    - with \pstree, there is a very simple solution, using the xbbh and xbbd
parameters (and possibly xbbl and xbbd),
    - in fact, with \pstree, the result is different according the kind of
nodes you use: you could see in the following examples that the upper position
is correct with \Tcircle but not with \Tr (but the bottom spacing is always
the same),
    - this is due to the \nodealign command which is called by some node
macros. I do not know the reason of this choice for some definitions and not
others. You can change this behaviour hacking the relevant macro definition
(see the last examples). Nevertheless, I globally do not encourage you to such
hacking... Better use the xbbh and xbbd parameters. If you have a lot of such
trees, you can of course set these parameters globally.


\documentclass[a4paper]{article}

\usepackage{a4wide}
\usepackage{pst-tree}
\usepackage{multirow}

\newcommand{\TreeX}[1][]{%
\pstree[#1]{\Tr{X}}{\Tr{Y}}}

\newcommand{\TreeY}[1][]{%
\pstree[#1]{\Tcircle{X}}{\Tcircle{Y}}}

\newcommand{\TreeZ}[1][]{%
\pstree[#1]{\Tcircle{WWW}}
           {\pstree{\Tcircle{X1}}{\Tcircle{X2}}
            \pstree{\Tcircle{Y1}}{\Tcircle{Y2}}
            \pstree{\Tcircle{Z1}}{\Tcircle{Z2}}}}

\pagestyle{empty}

\begin{document}

\LARGE

\begin{tabular}[b]{|c|c|}
  \hline
  AAAA & \shortstack{BBBB\\BBBB\\BBBB\\BBBB} \\ \hline
\end{tabular}
\hfill
\begin{tabular}[b]{|c|c|}
  \hline
  AAAA & \TreeX \\ \hline
\end{tabular}
\hfill
\begin{tabular}[b]{|c|c|}
  \hline
  AAAA & \TreeY \\ \hline
\end{tabular}

\vspace{1cm}
\begin{tabular}[b]{|c|c|}
  \hline
  AAAA   & \TreeX \\ \hline
  \TreeY & BBBB   \\ \hline
\end{tabular}
\hfill
\begingroup
\psset{showbbox=true}
\begin{tabular}[b]{|c|c|}
  \hline
  AAAA   & \TreeX \\ \hline
  \TreeY & BBBB   \\ \hline
\end{tabular}
\endgroup

\vspace{1cm}
\begin{tabular}[b]{|c|c|}
  \hline
  AAAA                      & \TreeX[xbbd=0.5] \\ \hline
  \TreeZ[xbbh=0.5,xbbd=0.5] & BBBB             \\ \hline
\end{tabular}
\hfill
\begin{tabular}[b]{|c|c|}
  \hline
  \multirow{4}*{AAAA}       & \TreeX[xbbd=0.5]    \\ \hline
  \TreeZ[xbbh=0.5,xbbd=0.5] & \multirow{7}*{BBBB} \\ \hline
\end{tabular}

\verb+___+\TreeX\verb+___+
\hfill
\begin{tabular}[b]{|c|c|}
  \hline
  AAAA & \TreeX \\ \hline
\end{tabular}
%
\makeatletter
\def\Tr at ii#1{%
\begin at treenode
\def\pstree at nodehook{%
\xdef\pstree at next{\pst at dima=\number\pst at dima sp\relax}}%
% D.G. modification begin - Nov. 26, 1999
%\nodealigntrue
% D.G. modification end
\setbox\pstree at box\hbox{#1\pssucc}%
\pstree at next
\pst at dimb=\wd\pstree at box
\advance\pst at dimb-\pst at dima
\pst at dimc=\ht\pstree at box
\pst at dimd=\dp\pstree at box
\setbox\pstree at box\hbox to\z@{\kern-\pst at dima\unhbox\pstree at box\hss}%
\ht\pstree at box=\z@
\dp\pstree at box=\z@
\end at treenode}
\makeatother
%
\hfill
\verb+___+\TreeX\verb+___+
\hfill
\begin{tabular}[b]{|c|c|}
  \hline
  AAAA & \TreeX \\ \hline
\end{tabular}

\end{document}


Denis Girou
-- 
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Centre National de la Recherche Scientifique                             |
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