Hello,
currently, the graphics build by TikZ are surrounded by an article document (class) like this:
\documentclass{article}
\usepackage{tikz}
\usepackage{aeguill}
\begin{document}
\begin{tikzpicture}
...
\end{tikzpicture}
\end{document}
Instead of using article, I recommend to use the standalone document class
\documentclass{standalone}
https://tex.stackexchange.com/questions/32127/standalone-tikz-pictures
Benefit: The size of the final PDF (generated by LaTeX) fits the graphic exactly. In particular, that is important for graphics which are bigger than the default paper size!