Graphics, Figures & Tables ⇒ tikZ | Drawing Trees

[leonardo1979]

Hello, I am Leo, a PhD student in social science. I live in Belgium and I usually go abroad very often.

I join this group because I want to use tikZ to draw a tree. Like the code below. However I have some problems:

1. I would like that the edges are enough long to write some words on them. As it is now, the nodes and words are almost overlapping. How may I get longer edges -BUT- avoiding that they overlap each other?
2. I would like that the graphic is more centered (and to too much on the top).

Code: Select all

\documentclass{minimal}
\usepackage[a4paper,margin=1cm,landscape]{geometry}
\usepackage{tikz}
\usetikzlibrary{positioning,shadows,arrows}
\begin{document}
\begin{center}
\begin{tikzpicture}[
level 1/.style={sibling distance=95mm},
level 2/.style={sibling distance=28mm},
level 3/.style={sibling distance=20mm},
level 4/.style={sibling distance=12mm},
    fact/.style={rectangle, draw=none, rounded corners=1mm, fill=blue, drop shadow,
        text centered, anchor=north, text=white},
    state/.style={circle, draw=none, fill=orange, circular drop shadow,
        text centered, anchor=north, text=white},
    leaf/.style={circle, draw=none, fill=red, circular drop shadow,
        text centered, anchor=north, text=white},
        %level distance=3cm
]
\node {$\mathcal{N}$}
child { node {i }
%
child{ node  {j}
%
%
child{ node {x(i,j)}
edge from parent
node[left] {$\alpha_j(i)$}
}
child{node { N2 }
%
edge from parent
node[midway] {$\overline{\alpha}_j(i)$}
}
edge from parent
node[left] {$\alpha_i(j)$}
}
%
%
child{ node  {k}
child{ node {x(i,k)}
edge from parent
node[] {$\alpha_k(i)$}
}
%
child{node  { N5 }
%
edge from parent
node[] {$\overline\alpha_k(i)$}
%
}
%edge from parent
%node[left] {$\alpha_j(i.j4)$}
%
%edge from parent
%node[right] {$\alpha_j(i.j444)$}
edge from parent
node {$\alpha_i(k)$}
}
%
child{ node {j}
child{ node {k}
child{ node {x(ijk)}
edge from parent
node[left] {$\alpha_k(jk)$}
}
child{node  { N6}
edge from parent
node {$\overline\alpha_k(jk)$}
}
edge from parent
node {$\alpha_j(jk)$}
}
child{node  { k}
child{ node {N7}
edge from parent
node [] {{$\alpha_k(jk)$}}
%edge from parent
%node[right] {YYYa31}
}
child{node  { N8}
edge from parent
node [right] {$\overline\alpha_k(jk)$}
}
edge from parent
node [right] {$\overline\alpha_j(jk)$}
}
edge from parent
node [right] {$\alpha_i(j,k)$}
}
%edge from parent
%node[left] {$\alpha_j(i.j1)$}
}
child {node [state] {i,jk }
child{ node [state]{j}
child{ node {x(i,j)}}
child{node [state] { N }}
}
child{ node [state] {k}
child{ node {x(i,k)}}
child{node [state] { N }}
}
child{ node [state]{jk}
child{ node [state]{k}
child{ node {x(ijk)}
}
child{node [state] { N}}
}
child{node  { k}
child{ node [state] {N}
}
child{node [state] { N}}
}
}
}
child {node [state] {i,jk }
child{ node [state]{j}
child{ node {x(i,j)}}
child{node [state] { N }}
}
child{ node [state] {k}
child{ node {x(i,k)}}
child{node [state] { N }}
}
child{ node [state]{jk}
child{ node [state]{k}
child{ node {x(ijk)}
}
child{node [state] { N}}
}
child{[level distance=15mm]  node [state] { k}
child{ node [state] {N}
}
child{node [state] { N}}
}
}
}
;
\end{tikzpicture}
\end{center}
\end{document}

I hope I could get some advice to solve this problems.

Kindest regards

Leo

[Stefan Kottwitz]

Hi Leo,

welcome to the board!

1. It seems that you need some more space, which means adjusting the level distance, besides the sibling distance.
2. For vertical centering, you could insert

   Code: Select all

   \vspace*{\fill}

   before and after the image.

Stefan

[leonardo1979]

Dear Stephan, thanks a lot for the advice.
Regards,
Leo