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91 lines
2.7 KiB
Markdown
91 lines
2.7 KiB
Markdown
---
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title: "Drawing Trees in LaTex with Tikz"
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date: 2022-12-06T11:01:24-05:00
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draft: false
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tags: ["LaTex"]
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math: false
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---
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For the longest time I've been avoiding Tikz because I imagined it being too difficult to learn. Usually I create a graphic using a program like [Draw.IO](https://draw.io) and import it as an image. Though this time around, I decided that I'm going to learn how to make trees in Tikz. It turns out, it's not as bad as I anticipated.
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I'm only going to provide a few simple examples in this post. To learn more check out the [Tikz documentation on trees](https://tikz.dev/tikz-trees).
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Remember to have `\usepackage{tikz}` in the preamble.
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To create a Tikz figure, you'll need to create a `tikzpicture` environment
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```latex
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\begin{tikzpicture}
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% Tikz Code Here
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\end{tikzpicture}
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```
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Every tree first begins with a root node.
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```latex
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\begin{tikzpicture}
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\node {Root Node};
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\end{tikzpicture}
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```
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The semicolon at the end denotes the end of a `tikz` command.
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Now let's make the root node have one child node.
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```latex
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\begin{tikzpicture}
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\node {Root Node}
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child {node {Child Node}};
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\end{tikzpicture}
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```
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Notice that the text of the nodes are within the `{}` after the node command.
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To create another child for a node, place it in the same level as the existing child.
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```latex
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\begin{tikzpicture}
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\node {Root Node}
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child {node {Left Child}}
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child {node {Right Child}};
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\end{tikzpicture}
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```
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The rendered tree may have text overlap as shown in the last screenshot. This is where `tikz` options come in. We can define the separation distance between siblings. I don't have many tips for choosing the value other than to play around and see how it looks.
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```latex
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\begin{tikzpicture}
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[
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level 1/.style={sibling distance=25mm}
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]
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\node {Root Node}
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child {node {Left Child}}
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child {node {Right Child}};
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\end{tikzpicture}
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```
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To show how the child nesting works, I'll finish by giving the right child two children nodes.
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```latex
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\begin{tikzpicture}
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[
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level 1/.style={sibling distance=25mm},
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level 2/.style={sibling distance=15mm},
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]
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\node {Root Node}
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child {node {Left Child}}
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child {
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node {Right Child}
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child {node {Child A}}
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child {node {Child B}}
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};
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\end{tikzpicture}
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```
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