### Include Custom LaTeX Definitions in Paper Preambles

Source: https://tikzit.github.io/index.html

To make custom LaTeX macros and package definitions available in your final document, include the .tikzdefs file in your paper's preamble using \input{}. Ensure tikzit.sty and the .tikzstyles file are also included.

```latex
% paper.tex

\documentclass{article}
\usepackage{tikzit}
\input{sample.tikzstyles}
\input{sample.tikzdefs}

\begin{document}

% ...

```

--------------------------------

### Define Custom LaTeX Macros for TikZiT Previews

Source: https://tikzit.github.io/index.html

Use a .tikzdefs file to load LaTeX packages and define custom macros. This file is automatically included by TikZiT when generating previews if it shares the same name as the active .tikzstyles file and is in the same directory.

```latex
% sample.tikzdefs

\usepackage{bm}
\newcommand{\param}[1]{\ensuremath{\vec{\bm{#1}}}}
```

--------------------------------

### TikZ Style File Grammar

Source: https://tikzit.github.io/index.html

Defines the grammar for TikZ style files, which consist of \tikzstyle commands. SIMPLE_STRING allows letters, numbers, and whitespace, while DELIMITED_STRING uses curly braces and supports nesting.

```grammar
<tikzstyles>   ::= ("\tikzstyle" DELIMITED_STRING "=" "[" <properties> "]")*

<properties>   ::= "[" <property> ("," <property>)* "]"

<property>     ::= <value> "=" <value> | <value>

<value>        ::= SIMPLE_STRING | DELIMITED_STRING
```

--------------------------------

### TikZ Figure File Grammar

Source: https://tikzit.github.io/index.html

Specifies the grammar for TikZ figure files, including the \begin{tikzpicture} environment, node and edge commands, and properties. It covers expressions like ignore, node, edge, and boundingbox.

```grammar
<tikzpicture>  ::= "\begin{tikzpicture}" <properties>?
                   <expression>*
                   "\end{tikzpicture}"

<expression>   ::= <ignore> | <node> | <edge> | <boundingbox>

<ignore>       ::= "\begin{pgfonlayer}" DELIMITED_STRING |
                    "\end{pgfonlayer}"

<properties>   ::= "[" <property> ("," <property>)* "]"

<property>     ::= <value> "=" <value> | <value>

<value>        ::= SIMPLE_STRING | DELIMITED_STRING

<node>         ::= "\node" <properties>? <nodename>
                      "at" <coords> DELIMITED_STRING ";"

<nodename>     ::= "(" (SIMPLE_STRING) (".center")? ")"

<coords>       ::= "(" NUMBER "," NUMBER ")"

<edge>         ::= "\draw" <properties>? <nodename>
                      "to" <edgenode>? (<nodename> | "()") ";"

<edgenode>     ::= "node" <properties>? DELIMITED_STRING

<boundingbox>  ::= "\path" "[use as bounding box]" <coords>
                      "rectangle" <coords> ";"
```

--------------------------------

### texopen.py Script for PDF Reverse Lookup

Source: https://tikzit.github.io/index.html

This Python script is used to open files from a PDF viewer. It checks if the file is a .tikz file and opens it with 'tikzit', otherwise it opens the file with 'subl' (Sublime Text) at the specified line. Customize 'subl' to your preferred editor.

```python
#!/usr/bin/python

import sys
import subprocess

if len(sys.argv) >= 3:
  file = sys.argv[1]
  line = sys.argv[2]

  print(file)
  print(line)

  if file.endswith('.tikz'):
    subprocess.call(['tikzit', file])
  else:
    subprocess.call(['subl', file + ':' + line])

```

--------------------------------

### Include TikZ Figures in LaTeX

Source: https://tikzit.github.io/index.html

Use `\tikzfig` for inline inclusion and `\ctikzfig` for centered inclusion of TikZ figures. These macros search for `.tikz` files in the current directory or a `figures` subdirectory. Ensure figures are centered on the origin for proper alignment.

```latex
% paper.tex

\documentclass{article}
\usepackage{tikzit}
\input{sample.tikzstyles}

\begin{document}

A tikz picture as an equation:
\begin{equation}
  \tikzfig{fig1}
\end{equation}

A centered tikz picture:
\ctikzfig{fig1}

\end{document}
```

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