Q: Bug in pstricks/color ?

[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.

>>>>> "Wolfgang.May" == Wolfgang May <may at informatik.uni-freiburg.de> writes:

    Wolfgang.May> Hi,
    Wolfgang.May> In the following document, in the second item, the keyword "If"
    Wolfgang.May> gets not colored green:

    Wolfgang.May> \documentclass{article}
    Wolfgang.May> \usepackage{pstricks,pst-node,pstcol}
    Wolfgang.May> \begin{document}
    Wolfgang.May> \begin{description}
    Wolfgang.May> \item[``{\green !}'' Conjunction:] Some transition satisfies 
    Wolfgang.May>     ${\blue  a}$ {\green and} the reached state satisfies $F$.
    Wolfgang.May> \item [``{\green ?}'' Implication:] {\green If} some transition
    Wolfgang.May>   satisfies ${\blue  a}$, {\green then} the reached state satisfies
    Wolfgang.May>   $F$.
    Wolfgang.May> \item [``{\green ?}'' Implication:] x{\green If} some transition
    Wolfgang.May>   satisfies ${\blue  a}$, {\green then} the reached state satisfies
    Wolfgang.May>   $F$.
    Wolfgang.May> \end{description}
    Wolfgang.May> \end{document}

    Wolfgang.May> Could someone please test this on an up-to-date installation ? 

  It's a known (yes, undocumented I believe...) effect: outside problems
described pages 88 and 89 of the PSTricks manual for coloring text
(D - Troubleshooting  - 3, 4, 5, 6), there are few special cases where colors
are loosed, like at the beginning of an item. Solution is the same as the one
described in Troubleshooting 3: "to precede the color command with
\leavevmode". So:

  \item [``{\green ?}'' Implication:] {\leavevmode\green If} some transition

  Nevertheless, you are strongly encourage today to use the "standard" `color'
package for coloring text:

\documentclass{article}

\usepackage{color} % Or \usepackage{pstcol} if you use PSTricks macros later

\begin{document}
\begin{description}
  \item [``\textcolor{green}{?}'' Implication:] \textcolor{green}{If} some
  transition satisfies $\textcolor{blue}{a}$, \textcolor{green}{then} the
  reached state satisfies $F$.
\end{description}
\end{document}


  P.S. In any case, you have not to load both `pstricks' and `pstcol',
as pstcol do it, adding an interface between the `color' package and
PSTricks. And you must load `pst-node' after `pstcol', because `pst-node'
load `pstricks' if this was not already done...
       So \usepackage{pstcol,pst-node} is better than
\usepackage{pstricks,pst-node,pstcol}

Denis Girou

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