LaTeXML hanging with TIKZ example

[casio7131]

I've got a simple example that causes LaTeXML to hang (uncomment marked line). Hopefully it'll be a simple fix.

\documentclass[10pt,a4paper,twoside,openany]{book}
\usepackage{tikz}
\usetikzlibrary{shapes}
\tikzstyle{calloutBox}=[rectangle callout,thick,rounded corners, draw=black, fill=green!70, opacity=0.9, callout absolute pointer={#1}]
\begin{document}
DUMMY TEXT.
\begin{tikzpicture}[remember picture]
\draw[fill=gray,draw=none,opacity=0.1] (0,0) rectangle (15,9.5);
\node[calloutBox={(+1,1)}, text width=6cm] at (+5,6.2) {This works!};
\node[calloutBox={(+1,1)}, text width=6cm] at (+12,6.2) {This works too!};
\node[rectangle callout,thick,rounded corners, draw=black, fill=green!70, opacity=0.9, callout absolute pointer={(+1,1)}, text width=6cm] at (+12,6.2) {... And this works too ...};
\node[rectangle callout,thick,rounded corners, draw=black, fill=green!70, opacity=0.9, callout absolute pointer={(+4.8,8.4)}, text width=6cm] at (+8,1.2) {This works in LaTeXML. Now make this a long line...};
%\node[rectangle callout,thick,rounded corners, draw=black, fill=green!70, opacity=0.9, callout absolute pointer={(+4.8,8.4)}, text width=6cm] at (+12,1.2) {*** Uncomment this line to hang LaTeXML *** (works in pdflatex tho)};
\end{tikzpicture}
\end{document}

Inn case it's useful, here is error after I manually kill it (via CTRL-C):

^C
Fatal:interrupt:interrupted LaTeXML was interrupted
    at ...pgf.tex; line 13 col 225
    INT
    In Core::Definition::Register[\toks Number] from TeX.pool.ltxml line 1105
     <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[Begin] <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[Begin] <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[Begin] <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[Begin] <= Core::Stomach[@0x3306218] <= Core::Definition::Constructor[\hbox B... <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[Begin] <= Core::Stomach[@0x3306218] <= Core::Definition::Constructor[\hbox B... <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[\setbox N... <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[Begin] <= Core::Stomach[@0x3306218] <= Core::Definition::Constructor[\hbox B... <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[\setbox N... <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[Begin] <= Core::Stomach[@0x3306218] <= Core::Definition::Constructor[\hbox B... <= Core::Stomach[@0x3306218] <= Core::Definition::Primitive[\setbox N... <= Core::Stomach[@0x3306218] <= Core::Definition::Constructor[\begin{... <= Core::Stomach[@0x3306218]
1 fatal error

NOTE: I'm using latest LaTeXML (via latexml-daily PPA on Ubuntu).

[brucemiller]

Alas, it's not so easy; there's some kind of rounding error going on in ``\pgfmathdivide@@` that ends up in an infinite loop, but it's not clear exactly where LaTeXML's error started.

Incidentally, this might be a good place to point to an interesting thing. I'd long thought that there could be a huge speedup implementing the math in perl --- but possibly lots of new rounding differences. I found that there are special bindings for luatex in pgf/libraries/luamath that would likely be a good guide for this.

[brucemiller]

Well, it took way to long to sort it out, but developing a binding for pgfmath (which is a pgf package supporting math expressions and floating point) works around the inconsistencies between ptf's math model, and also provides a non-trivial speedup to most tikz/pgf!

Your example shouldn't hang now. Thanks for the report!