Positioning of trees

Question

Consider

\documentclass[12pt,a4paper]{article}   
\usepackage{tikz-qtree}
\usepackage{tikz-qtree-compat}

\begin{document}

X + Y $\Rightarrow$ \begin{tikzpicture} \Tree [.X X Y ] \end{tikzpicture}


\end{document}

enter image description here

Suppose I want X[...] and not X in the tree below. How can I insert it? How can I get X and Y to have <...> inserted just below them, in the way it has been done with A and B in p. 14-16 of these slides: http://www.ucl.ac.uk/~ucjtmgg/docs/cam-slides.pdf

How can I regulate the position of the tree? I would like to have the tree so that X + Y $\Rightarrow$ comes roughly in the middle of where the tree is, as in page 17 of the slides above:

Since you have some responses below that seem to answer your question, please consider marking one of them as ‘Accepted’ by clicking on the tickmark below their vote count (see How do you accept an answer?). This shows which answer helped you most, and it assigns reputation points to the author of the answer (and to you!). It's part of this site's idea to identify good questions and answers through upvotes and acceptance of answers. — Jason Zentz, Jul 29 '15 at 17:28
Mostly duplicate of tikz pgf - An arrow between two tikzpictures - TeX - LaTeX Stack Exchange -- except in this case forest can be used as well. — user202729, Jun 05 '22 at 12:32

score 2 · Answer 1 · answered Jun 11 '15 at 17:46

The vertical placement of the figure can be done in many different ways. There is option baseline. Setting it to the center of the image (current bounding box.center) puts the middle on the current baseline of the surrounding text. The third example will show a way to center the image around the current math axis.

The second image puts the leafs on the same base line as the surrounding text.

The third image uses macro \VCenter to center the image around the math axis. The text before looks more like an equation. The centering is done via the TeX primitive \vcenter.

Additionally the nodes contain the angle brackets in a second line.

Full example:

\documentclass[12pt,a4paper]{article}
\usepackage{tikz-qtree}
\usepackage{tikz-qtree-compat}

\newcommand*{\VCenter}[1]{%
  \ensuremath{%
    \vcenter{%
      \hbox{#1}%
    }%
  }%
}

\begin{document}

X + Y $\Rightarrow$
\begin{tikzpicture}[baseline=(current bounding box.center)]
  \Tree [.X X Y ]
\end{tikzpicture}

\bigskip

\underline{X + Y $\Rightarrow$
\begin{tikzpicture}[baseline=(X.base)]
  \Tree [.X \node(X){X}; Y ]
\end{tikzpicture}}

\bigskip

X + Y $\Rightarrow$
\VCenter{\begin{tikzpicture}[
  every node/.append style={align=center},
  level distance=50pt,
]
  \Tree [ .\node{X\\$\langle\ldots\rangle$};
    \node{X\\$\langle\alpha\rangle$};
    \node{Y\\$\langle\beta\rangle$};
  ]
\end{tikzpicture}}

\end{document}

score 1 · Answer 2 · answered Jun 11 '15 at 17:16

\documentclass[12pt,a4paper]{article}   
\usepackage{tikz-qtree}
\usepackage{tikz-qtree-compat}
\usepackage{stackengine}
\begin{document}
\raisebox{3\baselineskip}{X + Y $\Rightarrow$} 
\tikzset{level 1/.style={level distance=60pt,sibling distance=30pt}}
\begin{tikzpicture} \Tree [.\stackunder{X}{$\langle$...$\rangle$} 
\stackunder{X}{$\langle\alpha\rangle$} \stackunder{Y}{$\langle\beta\rangle$} ] 
\end{tikzpicture}
\end{document}

enter image description here

score 1 · Answer 3 · answered Jun 11 '15 at 17:55

1

A compact forest solution which uses baseline to set an empty node to the baseline of the tree.

\documentclass[12pt,a4paper]{article}
\usepackage{forest}
\begin{document}
  X + Y $\Rightarrow$
  \begin{forest}
    for tree={align=center, parent anchor=south, child anchor=north, if n children=0{tier=t}{}}
    [{X\\$[\dots]$} [{X\\$\langle\alpha\rangle$}] [, no edge, baseline [, phantom]] [{Y\\$\langle\beta\rangle$}] ]
  \end{forest}
\end{document}

baseline forest

answered Jun 11 '15 at 17:55

cfr

198,882

I think using phantom node is not very reliable though. Could use adjustbox with valign=m instead. – user202729 Jun 05 '22 at 15:36

Positioning of trees

3 Answers3

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