reduzindo o espaço em branco abaixo da árvore tikz-qtree

Question

Estou incluindo árvores sintáticas em minha dissertação. Abaixo de cada árvore há uma enorme quantidade de espaço em branco, o que fará com que a redação da universidade grite, uive e gema e, em última análise, rejeite minha dissertação até que eu a conserte. Como removo o espaço em branco supérfluo abaixo da árvore?

MWE:

\documentclass{article}
\usepackage{tikz-qtree,tikz-qtree-compat}
\usepackage{gb4e}
\tikzset{every tree node/.style={align=center, anchor=north}}
\begin{document}
The relevant structure in \ref{tree:opt-marker-verb-move} shows the necessary movement for the verb to precede the suffix. XP refers to some unknown structure to which the verb is drawn.

\begin{exe}
\ex
\leavevmode\vadjust{\vspace{-\baselineskip}}\newline %this command makes the example number line up with the top of the tree, rather than the bottom
\begin{tikzpicture}
\tikzset{every tree node/.style={align=center,anchor=north}}
\Tree [.XP \node(XP){}; 
[.\textsc{FocusP} =em 
[.TP
[.vP {} 
[.VP {} 
[.V \node(VERB){puv}; ] 
] ] ] ] ]
\draw[->] (VERB) [in=-90,out=-90,looseness=1.5] to (XP);
\end{tikzpicture}\label{tree:opt-marker-verb-move}
\end{exe}

It is difficult to justify this verbal movement. First, we would have to identify a higher structure in a suitable relationship with the verb to motivate verbal movement. Then we would have to identify features to check that exist on both the new structure and the verb.
\end{document}

Answer 1

Uma opção é usar pgfinterruptboundingboxpara interromper a caixa delimitadora do caminho curvo; algum espaçamento manual deverá ser adicionado (ou veja abaixo para evitar intervenção manual):

\documentclass{article}
\usepackage{tikz-qtree,tikz-qtree-compat}
\usepackage{gb4e}
\tikzset{every tree node/.style={align=center, anchor=north}}
\begin{document}
The relevant structure in \ref{tree:opt-marker-verb-move} shows the necessary movement for the verb to precede the suffix. XP refers to some unknown structure to which the verb is drawn.


\begin{exe}
\ex
\leavevmode\vadjust{\vspace{-\baselineskip}}\newline %this command makes the example number line up with the top of the tree, rather than the bottom
\begin{tikzpicture}
\tikzset{every tree node/.style={align=center,anchor=north}}
\Tree [.XP \node(XP){}; 
[.\textsc{FocusP} =em 
[.TP
[.vP {} 
[.VP {} 
[.V \node(VERB){puv}; ] 
] ] ] ] ]
\begin{pgfinterruptboundingbox}
\draw[->] (VERB) [in=-90,out=-90,looseness=1.5] to (XP);
\end{pgfinterruptboundingbox}
\end{tikzpicture}\vspace{30pt}
\label{tree:opt-marker-verb-move}
\end{exe}

It is difficult to justify this verbal movement. First, we would have to identify a higher structure in a suitable relationship with the verb to motivate verbal movement. Then we would have to identify features to check that exist on both the new structure and the verb.

\end{document}

Para evitar ter que adicionar espaçamento manualmente, simplesmente coloque qualquer coisa sensata (um nó vazio, por exemplo) abaixo do nó mais baixo após a caixa delimitadora ter sido interrompida:

\documentclass{article}
\usepackage{tikz-qtree,tikz-qtree-compat}
\usetikzlibrary{positioning}
\usepackage{gb4e}
\tikzset{every tree node/.style={align=center, anchor=north}}
\begin{document}
The relevant structure in \ref{tree:opt-marker-verb-move} shows the necessary movement for the verb to precede the suffix. XP refers to some unknown structure to which the verb is drawn.


\begin{exe}
\ex
\leavevmode\vadjust{\vspace{-\baselineskip}}\newline %this command makes the example number line up with the top of the tree, rather than the bottom
\begin{tikzpicture}
\tikzset{every tree node/.style={align=center,anchor=north}}
\Tree [.XP \node(XP){}; 
[.\textsc{FocusP} =em 
[.TP
[.vP {} 
[.VP {} 
[.V \node(VERB){puv}; ] 
] ] ] ] ]
\begin{pgfinterruptboundingbox}
\draw[->] (VERB) [in=-90,out=-90,looseness=1.5] to (XP);
\end{pgfinterruptboundingbox}
\node[below=of VERB] {};
\end{tikzpicture}
\label{tree:opt-marker-verb-move}
\end{exe}

It is difficult to justify this verbal movement. First, we would have to identify a higher structure in a suitable relationship with the verb to motivate verbal movement. Then we would have to identify features to check that exist on both the new structure and the verb.

\end{document}

Answer 2

Você poderia usar \useasboundingboxantes do \drawcomando, para evitar que ele influenciasse a caixa delimitadora. Algum espaço extra abaixo deve ser adicionado para a seta, daí o [yshift=-1.2cm](encontrado por tentativa e erro).

\documentclass{article}
\usepackage{tikz-qtree,tikz-qtree-compat}
\usepackage{gb4e}
\tikzset{every tree node/.style={align=center, anchor=north}}
\begin{document}
The relevant structure in \ref{tree:opt-marker-verb-move} shows the necessary movement for the verb to precede the suffix. XP refers to some unknown structure to which the verb is drawn.

\begin{exe}
\ex
\leavevmode\vadjust{\vspace{-\baselineskip}}\newline %this command makes the example number line up with the top of the tree, rather than the bottom
\begin{tikzpicture}
\tikzset{every tree node/.style={align=center,anchor=north}}
\Tree [.XP \node(XP){}; 
[.\textsc{FocusP} =em 
[.TP
[.vP {} 
[.VP {} 
[.V \node(VERB){puv}; ] 
] ] ] ] ]
\useasboundingbox (current bounding box.north west) rectangle ([yshift=-1.2cm]current bounding box.south east);

\draw[->] (VERB) [in=-90,out=-90,looseness=1.5] to (XP);
\end{tikzpicture}\label{tree:opt-marker-verb-move}
\end{exe}

It is difficult to justify this verbal movement. First, we would have to identify a higher structure in a suitable relationship with the verb to motivate verbal movement. Then we would have to identify features to check that exist on both the new structure and the verb.
\end{document}

Answer 3

Consegui eliminar a maior parte do espaço em branco mexendo no valor out no comando draw. Mudei de -90 para -180 e consegui o espaçamento desejado.