[Tex/LaTex] adding a node to a qroof in tikz-qtree

linguisticstikz-qtreetrees

I need a node in the head element of a qroof in tikz-qtree (using tikz-qtree-compat). I need the 'np' to be a node so I can draw an arrow to it. However, the following breaks:

\documentclass[10pt]{article}
\usepackage{tikz-qtree}
\usepackage{tikz-qtree-compat}
\begin{document}
\begin{tikzpicture}
\Tree [ .TP I [ .T' T[past] [ .\node(vp){vP}; { } [ .v' v\\saw [ .VP { } [ .V' V(saw) \qroof{a man}.\node(nP){nP} ] ] ] ] ] ]
\end{tikzpicture}
\end{document}

The error is: Undefined control sequence \node(nP)nP.

Any ideas on how to accomplish a node there?

Best Answer

There are limits to the direct compatibility of qtree commands. The \qroof command is emulated with the \node command, which is why it can't use a \node as its label. But tikz-qtree has its own method for doing roof structures. You should use this for more complex roofs:

\documentclass[10pt]{article}
\usepackage{tikz-qtree}
\usepackage{tikz-qtree-compat}
\tikzset{every tree node/.style={align=center, anchor=north}} % to allow linebreaks
\begin{document}
\begin{tikzpicture}
\Tree [ .TP I [ .T\1 T\\{[past]} [ .\node(vp){vP}; { } [ .v\1 v\\saw 
      [ .VP { } [ .V\1 V\\(saw) [.\node(nP){nP}; \edge[roof]; {a man} ] ] ] ] ] ] ]
\end{tikzpicture}
\end{document}

P.S. I also cleaned up some of your formatting: you should use \1 for formatting bar levels instead of just '.

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\node[options](node name){node content};

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\begin{document}
\begin{tikzpicture}
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]
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\end{tikzpicture}
\end{document}

enter image description here

[Tex/LaTex] How to specify left and right node of a tikz-qtree

You can specify edges explicitly when needed, and specify [draw=none]. I've also simplified your tree: you don't need to enclose every node in a \node command unless you have independent reasons for referring to them. For this kind of tree, it might be helpful to make every node a uniform size, so that the sibling distances don't vary. You can do this by setting a minimum size for the every tree node/.style. I've given a second tree showing how this can be done. In a single tree, you could add the option to the {tikzpicture} environment itself instead of using \tikzset.

\documentclass{article}
\usepackage{tikz-qtree}
\begin{document}
\begin{tikzpicture}[grow'=up]
\Tree [.8 
        [.5 
            [.3 
                \edge[]; {1}
                \edge[draw=none]; {}  ]
             6  ] 
          12 ]
\begin{scope}[xshift=2in]
\tikzset{every tree node/.style={minimum width=2em}}
\Tree [.8 
        [.5 
            [.3 
                \edge[]; {1}
                \edge[draw=none]; {}  ]
             6  ] 
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\end{scope}   
\end{tikzpicture}
\end{document}

output of code

Best Answer

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[Tex/LaTex] Arrows in tikz-qtree with symbols in node names

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