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Fair enough. I've updated my post with a properly working example.

This is a question regarding TikZ and PGF. I'm trying to extract the x-, y-, and z-components of a coordinate into a macro so that the values can be manipulated using \pgfmathparse commands. As an example:


\begin{tikzpicture}
\coordinate (A) at (2.34, 3.21);
\pgfmathsetmacro{\Ax}{ "x-component ...

This may not be helpful to you, but if you are looking to define a shape that encompasses all nodes, you can use the fit parameter when defining a node.


\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{fit}

\begin{document}

\begin{tikzpicture}

\node (polarizer) at (0,1) [draw ...

Actually, I found exactly what I'm looking for:
Thanks though.

This is my first post, and forgive me if I'm asking something that's already been answered.

Is there a way to stop the compile process through the use of a command? Something like:


\exception{This is a user-set exception. Compile halted.}


So when performing the compile process, the specified ...