Aligning trees built with tikzpicture

Question

I want to align some trees I am creating. I want the root node of all the trees to be on the same line. Currently for each tree I create, the root node of each subsequent tree is on a line after the bottom of the previous tree. How can I do this?

Claudio Fiandrino · Answer 1 · 2012-04-07T14:26:33.093

2

In a very simple manner, you can specify the position of the root in the picture. Look at this MWE:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{trees}
\begin{document}

\begin{tikzpicture}[edge from parent fork down,
  every node/.style={fill=red!30,rounded corners},
  edge from parent/.style={red,thick,draw}]
\node at (0,0) {root}
 child {node {left}}
 child {node {right}
 child {node {child}}
 child {node {child}}
};

\node at (4,0) {root}
 child {node {left}}
 child {node {right}
 child {node {child}}
 child {node {child}}
};

\node at (8,0) {root}
 child {node {left}}
 child {node {right}
 child {node {child}}
 child {node {child}}
};
\end{tikzpicture}

\end{document}

This will be graphically:

enter image description here

edited Apr 07 '12 at 14:26

answered Apr 07 '12 at 14:00

Claudio Fiandrino

63,575

that's exactly what I want to do. – Harold Rosenberger Apr 07 '12 at 14:02
[edge from parent fork down,every node/.style=fill=red!30,rounded corners}, edge from parent/.style={red,thick,draw}] – Harold Rosenberger Apr 07 '12 at 14:04
Now, I do now have nice straight lines as shown. ALso, how can I get it to look more like a typical binary tree? Also, the top two level of my trees, the nodes are black. – Harold Rosenberger Apr 07 '12 at 14:16
Happy that it works also to you. To have the picture more similar to a binary tree you just need to remove the general options in [ ] after the opening of the tikzpicture. You can also refer to the pgfmanual page 114 (version October 25, 2010). – Claudio Fiandrino Apr 07 '12 at 14:22
I change the "header" inffo to this: – Harold Rosenberger Apr 07 '12 at 14:22
[edge from parent fork down, every node/.style=red!80, rounded corners, edge from parent/.style={red!80,thick,draw}] – Harold Rosenberger Apr 07 '12 at 14:22
Now, I do not have any borders on the node. How can I now add circle - in red - as borders – Harold Rosenberger Apr 07 '12 at 14:23
Ok just change your "header" into: [ every node/.style={red!80, rounded corners,draw}, edge from parent/.style={red!80,thick,draw}] – Claudio Fiandrino Apr 07 '12 at 14:28
Ah,one more thing. If I add only one node, it adds it in a straight vertical position. Can I make it add to the left or right? Like a binary tree, depending on the key. – Harold Rosenberger Apr 07 '12 at 14:37
@HaroldRosenberger Use the [missing] key on a child node. See How do I make an unbalanced binary tree. You may also want to check out tikz-qtree (see my answer there) if you are drawing trees a lot; its syntax is much more compact. – Alan Munn Apr 07 '12 at 14:46
I'm new to latex. where/how do I specify the [missing] key? – Harold Rosenberger Apr 07 '12 at 14:51
Ah, nevermind. I see just add another node. – Harold Rosenberger Apr 07 '12 at 19:12
\node at (0,0)[rectangle,draw] {13} child{node[rectangle,draw]{7} child{node[rectangle,draw]{3}} child{node[rectangle,draw]{9}}} child{node[rectangle,draw]{16} child{node[rectangle,draw]{14 15}} child{node[rectangle,draw]{20 21}} } ; – Harold Rosenberger Apr 07 '12 at 19:30
for the above code, the 14/15 node and the 9 node overlay each other. I do not know why. – Harold Rosenberger Apr 07 '12 at 20:00
Here's another example. Nodes 9 and 15 overlap on the printed page. – Harold Rosenberger Apr 07 '12 at 20:27
[ every node/.style={blue!80, rounded corners,draw}, edge from parent/.style={blue!80,thick,draw},level 1/.style={sibling distance=30mm},level 2/.style={sibling distance=15mm}] – Harold Rosenberger Apr 07 '12 at 20:46
1

@HaroldRosenberger: Please clean up by removing the comments after this discussion. Comments are only for adding some valuable remark to an answer. Feel free to edit your question for adding information, or to post your own answer, or if it's derived from Claudio's solution, make an edit suggestion regarding his answer to extend it. But please delete those many comments, otherwise a mod may do it and you might keep some code though. – Stefan Kottwitz Apr 08 '12 at 09:12

Aligning trees built with tikzpicture

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