Several arguments in tikzset pic

Question

I want to pass more than one argument to a pic defined with \tikzset.

I tried this and it works:

\tikzset{
    Piece/.pic={
        \draw (0:1) -- (120:1) -- (240:1) -- cycle;
        \draw (0,0) node {$\Gamma_#1$};
    }
};

\pic {Piece={k}};

I get the following image:

But what I really need is to have two subscripts, as in this one:

However, no matter what I write in the \pic command, it is treated as a string and associated to the #1 argument. I would like something like:

\tikzset{
    Piece/.pic={
        \draw (0:1) -- (120:1) -- (240:1) -- cycle;
        \draw (0,0) node {$\Gamma_{#1,#2}$};
    }
};

\pic {Piece={k,r}};

But this does not work.

How can I specify two different and independent arguments?

Thank you in advance.

See http://tex.stackexchange.com/a/167585/43317 – esdd May 25 '16 at 15:09 — esdd, May 25 '16 at 15:09

percusse · Accepted Answer · 2016-05-25T15:20:34.330

17

You can switch to the alternative definition of the pic style family such that style 2 args or style n args, style args stuff from the regular pgfkeys syntax can be used for arguments.

\documentclass[tikz]{standalone}
\tikzset{
  pics/Piece/.style n args={3}{
    code = { %
          \draw (0:1) -- (120:1) -- (240:1) -- cycle;
          \draw (0,0) node[#2,#3] {$\Gamma_{#1}$};
    }
  }
}
\begin{document}
\begin{tikzpicture}
\pic {Piece={k}{draw=red}{fill=red!10}};
\end{tikzpicture}
\end{document}

edited May 25 '16 at 15:20

answered May 25 '16 at 15:06

percusse

157,807

Ah, this is what he meant? :| – Alenanno May 25 '16 at 15:07
Yes, this is what I meant. However, I tried this and for some reason it works for 2 parameters but not for 3. – Aitor Pérez Pérez May 25 '16 at 15:16
@AitorPérezPérez See the update – percusse May 25 '16 at 15:20
Yes, that works. I changed the 2 to a 3, but I did not write "n args={3}", I don't know why "2 args" works but "3 args" does not.
Thank you very much!
– Aitor Pérez Pérez May 25 '16 at 15:25

Several arguments in tikzset pic

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