Preventing graph overflow

Question

Anyone would know how to prevent graph overflow ?

Here is what I have now :

We can see on the image that the graph is cropped on his right side. Here is the code I use:

\documentclass{article}
\usepackage{tikz} 
\usepackage{tikz-qtree}
\usepackage{pxfonts}
\usepackage{lscape}
\definecolor{HE}{rgb}{0.01, 0.75, 0.24}
\definecolor{FE}{rgb}{0.19, 0.55, 0.91}
\begin{document}
\begin{landscape}
\begin{tikzpicture}
\tikzset{edge from parent/.style=
{draw,
edge from parent path={(\tikzparentnode.south)
-- +(0,-8pt)
-| (\tikzchildnode)}}}
\Tree [.Coucherie~$A_{t}$~tel~que~\textcolor{FE}{$(b, \neg a)$ }
[.\footnotesize{(I)}:,,$m$
    [.\footnotesize{($a$)}:,,\textcolor{HE}{$(b, \neg a)$} 
        [.\footnotesize{(a)}:,,$\textcolor{HE}{p_{n}}$~$\land$~$\textcolor{FE}{p_{n}}$ ]
        [.\footnotesize{(b)}:,,$\textcolor{HE}{p_{n}}$~$\land$~$\textcolor{FE}{\neg p_{n}}$ ]
        [.\footnotesize{(c)}:,,$\textcolor{HE}{\neg p_{n}}$~$\land$~$\textcolor{FE}{p_{n}}$ ]
        [.\footnotesize{(d)}:,,$\textcolor{HE}{\neg p_{n}}$~$\land$~$\textcolor{FE}{\neg p_{n}}$ ]
    ]
    [.\footnotesize{($b$)}:,,\textcolor{HE}{($b, a)$} 
        [.\footnotesize{(AA)} ]
        [.\footnotesize{(BB)} ]
        [.\footnotesize{(CC)} ]
        [.\footnotesize{(D)} ]
    ]
    [.\footnotesize{($g$)}:,\textcolor{HE}{($\neg b, a$)} 
        [.\footnotesize{(AA)} ]
        [.\footnotesize{(BB)} ]
        [.\footnotesize{(CC)} ]
        [.\footnotesize{(DD)} ]
    ]
    [.\footnotesize{($d$)}:,\textcolor{HE}{$(\neg b, \neg a)$} 
        [.\footnotesize{(AA)} ]
        [.\footnotesize{(BB)} ]
        [.\footnotesize{(CC)} ]
        [.\footnotesize{(DD)} ]
    ]
]
[.\footnotesize{(II)}:,,$\neg m$
    [.\footnotesize{($a$)} 
        [.\footnotesize{(AA)} ]
        [.\footnotesize{(BB)} ]
        [.\footnotesize{(CC)} ]
        [.\footnotesize{(DD)} ]
    ] 
    [.\footnotesize{($b$)} 
        [.\footnotesize{(AA)} ]
        [.\footnotesize{(BB)} ]
        [.\footnotesize{(CC)} ]
        [.\footnotesize{(DD)} ]
    ] 
    [.\footnotesize{($g$)}
        [.\footnotesize{(AA)} ]
        [.\footnotesize{(BB)} ]
        [.\footnotesize{(CC)} ]
        [.\footnotesize{(DD)} ]
    ] 
    [.\footnotesize{($d$)} ] 
        [.\footnotesize{(a)} ]
        [.\footnotesize{(b)} ]
        [.\footnotesize{(c)} ]
        [.\footnotesize{(d)} ]
    ]
]
\end{tikzpicture}
\end{landscape}
\end{document}

For my graph, I think that make the end "branches" vertical instead of horizontal would be a nice solution, if someone knows how to do that oh please share.

(Also, if someone would know how to scale/zoom the whole graph 'would be great.)

Thanks a lot all.

Answer 1

This is more or less a rip-off of Saving vertical space in tree diagram. I switched from tikz-qtree to forest because of this. The bracket syntax is basically the same I believe, but you don't need the . with forest.

I'm definitely not a forest expert though, this was just cobbled together, so there may well be possible improvements.

One minor comment about the \footnotesizes: First of all, \footnotesize is a declaration that affects all the following text in the same group, it's not a macro that takes an argument. So to limit its effect you should use {\footnotesize ...}, not \footnotesize{...}. Second, instead of adding \footnotesize to basically all the nodes, you could have done \begin{tikzpicture}[every node/.append style={font=\footnotesize}], and instead changed to \normalsize for the single node that isn't footnotesize.

\documentclass{article}
\usepackage[edges]{forest} 
\usepackage{pxfonts}
\usepackage{lscape}
\definecolor{HE}{rgb}{0.01, 0.75, 0.24}
\definecolor{FE}{rgb}{0.19, 0.55, 0.91}
\begin{document}
\begin{landscape}
\centering
\begin{forest}
for tree={font=\footnotesize,align=left},
where level<=1{%
edge path'={(!u.parent anchor) -- ++(0,-15pt) -| (.child anchor)},
      }{%
        folder,
        grow'=0,
        if level<=2{%
          before typesetting nodes={child anchor=north},
          edge path'={(!u.parent anchor) -- ++(0,-15pt) -| (.child anchor)},
        }{},
      }
[Coucherie~$A_{t}$~tel~que~\textcolor{FE}{$(b, \neg a)$ }
[(I):,,$m$
    [($a$):,,\textcolor{HE}{$(b, \neg a)$} 
        [(a):,,$\textcolor{HE}{p_{n}} \land \textcolor{FE}{p_{n}}$ ]
        [(b):,,$\textcolor{HE}{p_{n}} \land \textcolor{FE}{\neg p_{n}}$ ]
        [(c):,,$\textcolor{HE}{\neg p_{n}} \land \textcolor{FE}{p_{n}}$ ]
        [(d):,,$\textcolor{HE}{\neg p_{n}} \land \textcolor{FE}{\neg p_{n}}$ ]
    ]
    [($b$):,,\textcolor{HE}{($b, a)$} 
        [(AA)]
        [(BB)]
        [(CC)]
        [(D)]
    ]
    [($g$):,\textcolor{HE}{($\neg b, a$)}
        [(AA)]
        [(BB)]
        [(CC)]
        [(DD)]
    ]
    [($d$):,\textcolor{HE}{$(\neg b, \neg a)$} 
        [(AA)]
        [(BB)]
        [(CC)]
        [(DD)]
    ]
]
[(II):,,$\neg m$
    [($a$) 
        [(AA)]
        [(BB)]
        [(CC)]
        [(DD)]
    ] 
    [($b$) 
        [(AA)]
        [(BB)]
        [(CC)]
        [(DD)]
    ] 
    [($g$)
        [(AA)]
        [(BB)]
        [(CC)]
        [(DD)]
    ] 
    [($d$)] 
        [(a)]
        [(b)]
        [(c)]
        [(d)]
    ]
]
\end{forest}
\end{landscape}
\end{document}