Tikz edge label position

Question

Is there a way to set the location of the position of edge label when using the tikz graph package?

I attempted to look for samples of this being done in the manual, but was unable to find any (closest I got was in 19.6 where it shows how to set some options for individual edges).

Is this possible?

Edit: more specifically, I am looking for a way to put the label above or below the edge.

Edit to add MWE:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{graphdrawing,positioning,graphs}
\usegdlibrary{layered, trees}
\begin{document}
\begin{tikzpicture}
    \begin{graph}
     {1->[edge label=hello]2};
    \end{graph}
\end{tikzpicture}

\end{document}

have you seen Moving a label along the path or How to position the labels of the path in automata? ? — cmhughes, Feb 09 '14 at 15:40
@cmhughes This is using the graph library which has a different syntax. — soandos, Feb 09 '14 at 20:37
I suppose he thought that was what you meant by 'graph package'. Do you mean tkz-graph? (Which is not TikZ, but a package built on TikZ.) Edit: Could you create a minimal example perhaps? — Torbjørn T., Feb 09 '14 at 21:29
@TorbjørnT. no, I mean the graphs library, (used with \begin{graph}...\end{graph} in a tikzpicture environment). — soandos, Feb 09 '14 at 21:32
A minimal example would have made this clearer. I haven't installed PGF 3.0 yet, so I can't really help I'm afraid, but there's probably someone else who can. — Torbjørn T., Feb 09 '14 at 21:55
Just came across this one again. I think the labels are placed with the auto option enabled, placing the label above the line for your example. To place it below, add swap, i.e. {1->[edge label=hello,swap]2}; Does that answer your question? — Torbjørn T., Mar 14 '14 at 23:31
@TorbjørnT. Sorry I missed this somehow. If you add it as an answer it will be accepted. — soandos, Sep 10 '14 at 04:41

score 10 · Accepted Answer · answered Sep 10 '14 at 06:27

The labels seem to be placed with the auto option enabled, which places the node/label on the side of the line, in your MWE above it. As such you can add the swap option to move the label to the other side.

enter image description here

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{graphdrawing,positioning,graphs}
\usegdlibrary{layered, trees}
\begin{document}
\begin{tikzpicture}
    \begin{graph}
     {1 -> [edge label=hello]
      2 -> [edge label=hello,swap]
      3};
    \end{graph}
\end{tikzpicture}
\end{document}

Tikz edge label position

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