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I have an automaton in tikz and would like to have some text within a triangle of the right size. How can I do that efficiently?

I have tried using a regular polygon, but I can't shrink it to the right size: minimum height and minimum size have no effect. So is there any parameter that controls the size?

     \node[state,inner sep=0pt,minimum size=.3cm] at (0,0) (init) {};
     \node[state,inner sep=0pt,minimum size=.3cm] at (-5,-1.3) (idelta)
    \node[draw,minimum height=.5cm,regular
    polygon,regular polygon sides=3] at (-5,-1.3) {foo};

     (init)+(0,.5cm) edge (init)
     (init) edge node[] {bar} (idelta);
share|improve this question
inner sep=0 maybe? – percusse Jul 8 '13 at 17:49
inner sep=0 did make the triangle a bit smaller, but minimum height, minimum size still has no effect. I do need the triangle much smaller. scale does the trick, but also shrinks the text. – DaveBall aka user750378 Jul 8 '13 at 17:52
It can't be smaller than the text box.Unless you make a negative inner sep but that has other complications. Or you can change the apex angle to a large value such that it gets wider and shorter – percusse Jul 8 '13 at 17:53
Remove the node text and add a label: label=center:foo. But you have to take care that the shape border doesn’t overlap with the text as it doesn’t do this automatically anymore, similar to using a negative inner sep. – Qrrbrbirlbel Jul 8 '13 at 17:59
@Qrrbrbirlbel: thanks a lot, useful as always :) – DaveBall aka user750378 Jul 8 '13 at 18:39
up vote 3 down vote accepted

I think this is small enough via kerning (which makes the box quite smaller horizontally) :-)

   \node[draw,minimum size=0cm,inner sep=0,regular polygon,regular polygon sides=3] at (-5,-1.3) {\kern-0.15emfoo\kern-0.15em};
   \node[draw,minimum size=0cm,inner sep=0,regular polygon,regular polygon sides=3] at (-5,-1.3) {\kern-0.5emfoo\kern-0.5em};

enter image description here

share|improve this answer
yes they are math spaces, sorry :-) but they are too handy. – percusse Jul 8 '13 at 19:26
kerning's a good idea, since the triangle grows with the text (+1). But I favor the tikz solution since I can position the text better within the triangle. – DaveBall aka user750378 Jul 8 '13 at 20:06
@DaveBallakauser750378 This is a Tikz solution. – percusse Jul 8 '13 at 20:09
Even though I used a different solution (see my own answer), I've accepted your answer, since it is a simple Tikz solution... – DaveBall aka user750378 Jul 11 '13 at 19:36

I don't know tikz, but I'm sure one of these formulations can be stuck into a tikz picture.

  \setlength\triwidth{\widthof{#1\ }}%
  \stackengine{-.4\triwidth}{#1\ }%
  \setlength\triwidth{\widthof{\ #1\ }}%
  \stackengine{-.2\triwidth}{\ #1\ }
\parskip 1ex


enter image description here

share|improve this answer
Using \widthof is a good idea - and stackengine anyways ;) – DaveBall aka user750378 Jul 8 '13 at 20:07

Using Qrrbrbirlbel comments and answer How can I set the TikZ label anchor explicitly?, I got the following solution:

        \node[inner sep=0,draw,minimum height=#3,regular
        polygon,regular polygon
        sides=3,label={[anchor=south,inner ysep=.03em]below:\footnotesize #4},anchor=north]
        at (#1,#2) {};


\tikzset{anchor/.append code=\let\tikz@auto@anchor\relax}

in the preamble.

triangle-example, e.g. for trees

share|improve this answer
The label is just a node, so you can use inner ysep=<something smaller then .3333em as well. (If you use this often, you might use an extra style and/or the every label style.) – Qrrbrbirlbel Jul 8 '13 at 19:53

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