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My current picture of a Petri net is below

The problem: the 'bars' (in grey) are too tall, although minimum height=0.1mm (seems doesn't have any effect). Is it possible to make these grey rectangles even thinner?

The code is (no need to read the whole, just look into two comments):


\begin{tikzpicture}[node distance=1.3cm,>=stealth',bend angle=45,auto]

\tikzstyle{place}=[circle,thick,draw=blue!75,fill=blue!20,minimum size=6mm]
\tikzstyle{red place}=[place,draw=red!75,fill=red!20]
\tikzstyle{transition}=[rectangle,  % <------Can we make them thinner?
          minimum height=0.1mm,     %<------------------ this doesn't help
          minimum width=8mm,
          rounded corners]

\tikzstyle{every label}=[red]

\node [place,tokens=1] (start)                    {$start$};
\node [transition] (start_to_start_q0) [below left of=start] {};
\node [transition] (start_to_q0_ok) [below right of=start] {};

\node [place]          (q0)     [below of=start_to_start_q0]  {$q_0$};
\node [place]          (ok)     [below of=start_to_q0_ok]     {$ok$};

\node [place] (q) [below left of=q0]             {$q$};
\node [transition] (from_q_ok) [below right of=q] {};

\node [place] (qsa) [below left of=from_q_ok]           {$q_{a!!}$};
\node [place] (a) [right of=qsa]                    {$a$};
\node [transition] (from_qsa_a) [below right of=qsa] {};

\node [place] (p) [right of=a]                    {$p$};
\node [transition] (from_a_p) [below right of=a] {};

\node [place] (qend) [below of=from_qsa_a]             {$q'$};

\node [place] (pra) [below of=from_a_p]             {$p_{a??}$};
\node [transition] (from_ok_pra) [right of=pra] {};
\node [place] (pend) [right of=from_ok_pra]             {$p'$};

\path (start_to_start_q0)
  edge [pre,bend right]                (start)
  edge [post]                          (start)
  edge [post]                          (q0);

\path (start_to_q0_ok)
  edge [pre]                           (start)
  edge [post]                          (q0)
  edge [post]                          (ok);

\path (from_q_ok)
  edge [pre]                          (q)
  edge [pre]                          (ok)
  edge [post]                         (qsa)
  edge [post]                         (a);

\path (from_qsa_a)
  edge [pre]                          (qsa)
  edge [pre]                          (a)
  edge [post]                         (qend)
  edge [post]                         (ok);

\path (from_a_p)
  edge [pre]                          (a)
  edge [pre]                          (p)
  edge [post]                         (pra)
  edge [post]                         (a);

\path (from_ok_pra)
  edge [pre]                          (ok)
  edge [pre]                          (pra)
  edge [post]                         (ok)
  edge [post]                         (pend);    


share|improve this question
Welcome to TeX.SX! Please make your code compilable, starting with \documentclass{...} and ending with \end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to help you. Help them help you: remove that one hurdle between you and a solution to your problem. – Jubobs Sep 30 '13 at 18:41
Sorry - I gave up half way through an answer. -Too much code, where only a small part is nedded, and it is not compileable. I think you need to look at inner sep option. – Hans-Peter E. Kristiansen Sep 30 '13 at 18:48
Yes - If you add inner sep=0 to your nodes, then you can control the heigth with minimum height. But be aware, that the rounded corners will look strange with a very small height. – Hans-Peter E. Kristiansen Sep 30 '13 at 19:00
@Hans-PeterE.Kristiansen i would accept your comment as an answer, but cannot.) rounded corners are not an issue -- i removed them. thaanks! – Ayrat Sep 30 '13 at 19:09
up vote 4 down vote accepted

The inner sep node option is a node padding, that insures space between node text and node border. By setting it to zero, you can control the node height with minimum height as wished.

This code:

          minimum height=1mm,
          minimum width=8mm,
          rounded corners,
          inner sep=0]

1 mm nodes

gives 1 mm high nodes, but the rounded corners now look odd. Maybe that is an issue for an other question.

share|improve this answer
You may use rounded corners=.5mm (half of minimum height). – Paul Gaborit Sep 30 '13 at 22:26
Or even the shape rounded rectangle which needs the library shapes.misc. Moreover, do not use \tikzscale, but rather \tikzset: see Should \tikzset or \tikzstyle be used to define TikZ styles? – Claudio Fiandrino Oct 1 '13 at 6:17

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