# Background

I was trying to find out if I can use tikzscale to scale the tikz-qtree figure in Text tree using tikz-qtree is too wide, don't know how to break lines and make the tree compact to fit in \linewidth. Unfortunately, instead of getting a scaled figure, I get a picture of code snippet in my mygraph.tikz.

# Codes

Here is an MWE:

\documentclass{article}

\usepackage{tikz-qtree}
\usepackage{tikzscale}
\begin{document}

\includegraphics[width=\linewidth]{mytree.tikz}

\end{document}


And here is mytree.tikz

\begin{tikzpicture}
\Tree
[.A
[.B ]
[.C
[.D  ]
[.E  ]]]
\end{tikzpicture}

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This is MMM's answer. He has already uploaded the patched tikzscale package to ctan. I will open a bounty later, in his answer that led to this package, to express my appreciation to MMM's work on this package and his speedy reply. It was a little late in posting this but I hope that you can still benefit from the information here.

Don't you get the correct tree as output at all? When using a slightly adapted size (otherwise the height of the tree is too large to fit on a page) like in

\includegraphics[width=0.9\linewidth]{mytree.tikz}


I get the attached output file, which is the correct tree, I think. If you do not get this output, please use the attached sty-file* and a recent development variant of TikZ/PGF.

Although the tree is correct, the size of the nodes (with the meaning of edges and nodes, i.e. graph speech) is very large, which is, what tikzscale wants to avoid normally. tikzscale normally uses the tikzpicture's scale option to iteratively converge to the correct size as in \begin{tikzpicture}[scale=4].

This works, as TikZ/PGF defines, that scaling does not scale nodes (with the meaning of coordinates and nodes, i.e. TikZ speech). Unfortunately, the tikz-qtree package seems to ignore that definition. I am not sure, if that was done on purpose (I've CC'ed its author), but I do not think that tikzscale can do much as long as tikz-qtree does this scaling.

Did you have a look at the graph chapter in a recent development version of TikZ/PGF? I think these graphs behave correctly regarding scaling, which basically means, that they are unscalable at the moment.

You can try using code like the following

 \makeatletter
\ifdef{\tikzscale@scale}{%
% This is not commutative, as there is an error on commutation!
\pgfmathsetlength{\parts}{\textwidth * \tikzscale@scale}%
}{}%
\makeatother


to get a dynamically sized variable \parts, which can be used to set the node distance or something like that, to get a graphic which is scalable with tikzscale, but this is all not officially supported, yet. Nevertheless, I would be interested to hear about use cases.

# About the tikz-qtree

The author has expressed interest in fixing the scale implementation as suggested by MMM.

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