我有一个包含多个 TikZ 图像的文档（双栏文章），我想要：
- 规模将数字缩小到列宽的一半，而不改变文本的字体大小
- 外化文件夹里面的数字
./tikz_output - 设置外部文件名
externalize通过使用，避免自动生成名称tikzsetnextfilename
我发现下面的代码来自这个老问题，它满足第 1 点和第 2 点，但在设置外部化文件名时不起作用：
% Automagically scale a Tikz picture, so it has the desired (given) width.
% Does NOT scale line width/text width! Needs the package "environ"!
%
% Usage:
%
% \begin{myscaletikzwidth}{\textwidth}
% \begin{tikzpicture}[scale=\tikzscale]
% ..
% \end{tikzpicture}
% \end{myscaletikzwidth}
%
\makeatletter
\newsavebox{\measure@tikzpicture}
\NewEnviron{myscaletikzwidth}[1]{%
\tikzifexternalizingnext{%
\def\tikz@width{#1}%
\def\tikzscale{1}\begin{lrbox}{\measure@tikzpicture}%
\tikzset{external/export next=false,external/optimize=false}% force translation of this BODY (and do not optimize it away as it would usually do):
\BODY
\end{lrbox}%
\pgfmathparse{#1/\wd\measure@tikzpicture}%
\edef\tikzscale{\pgfmathresult}%
\BODY
}{% this will re-use an existing external graphics:
\BODY
}%
}
\makeatother
\usepackage{todonotes}
\makeatletter
\renewcommand{\todo}[2][]{%
\tikzexternaldisable\@todo[#1]{#2}\tikzexternalenable%
}
\makeatother
当不设置任何外部化文件名时，一切正常；当设置外部化文件名时，它会崩溃，显示以下内容：
Package tikz Error: Sorry, the system call 'pdflatex -shell-escape -halt-on-error -interaction=batchmode -jobname "tikz_output/mynd_1" \def\tikzexternalrealjob{main}\input{main}"' did NOT result in a usable output file 'tikz_output/mynd_1' (expected one of .pdf:.jpg:.jpeg:.png:). Please verify that you have enabled system calls. For pdflatex, this is 'pdflatex -shell-escape'. Sometimes it is also named 'write 18' or something like that. Or maybe the command simply failed? Error messages can be found in 'tikz_output/mynd_1.log'. If you continue now, I'll try to typeset the picture.
See the tikz package documentation for explanation.
Type H <return> for immediate help.
...
l.72 \end{myscaletikzwidth}
如何修复此问题？
我的代码如下所示（我目前正在测试这个背页)：
\documentclass[twocolumn]{article}
\usepackage{epstopdf}
\usepackage[hypcap=true]{subcaption}
\usepackage{lipsum}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows,arrows.meta,positioning,calc,fit}
\usepackage{tikzscale}
\usepackage{circuitikz}
\usetikzlibrary{external}
\tikzexternalize[prefix=tikz_output/]
\usepackage{environ}
% Automagically scale a Tikz picture, so it has the desired (given) width.
% Does NOT scale line width/text width! Needs the package "environ"!
%
% Usage:
%
% \begin{myscaletikzwidth}{\textwidth}
% \begin{tikzpicture}[scale=\tikzscale]
% ..
% \end{tikzpicture}
% \end{myscaletikzwidth}
%
\makeatletter
\newsavebox{\measure@tikzpicture}
\NewEnviron{myscaletikzwidth}[1]{%
\tikzifexternalizingnext{%
\def\tikz@width{#1}%
\def\tikzscale{1}\begin{lrbox}{\measure@tikzpicture}%
\tikzset{external/export next=false,external/optimize=false}% force translation of this BODY (and do not optimize it away as it would usually do):
\BODY
\end{lrbox}%
\pgfmathparse{#1/\wd\measure@tikzpicture}%
\edef\tikzscale{\pgfmathresult}%
\BODY
}{% this will re-use an existing external graphics:
\BODY
}%
}
\makeatother
\usepackage{todonotes}
\makeatletter
\renewcommand{\todo}[2][]{%
\tikzexternaldisable\@todo[#1]{#2}\tikzexternalenable%
}
\makeatother
\begin{document}
\begin{figure}[!h]
\centering
\begin{subfigure}[b]{0.49\columnwidth}
\centering
\tikzsetnextfilename{mynd_1}
\begin{myscaletikzwidth}{\textwidth}
\begin{tikzpicture}[scale=\tikzscale]
\draw[->] (0,0) -- (4.5,0) node[right] {$t$};
\draw[->] (0,0) -- (0,3) node[above] {$\ddot{s}\left(t\right)$};
\draw plot[domain=0:4.5,smooth] (\x,{1 + cos(\x r)});
\end{tikzpicture}
\end{myscaletikzwidth}
\caption{}
\end{subfigure}%
\begin{subfigure}[b]{0.49\columnwidth}
\centering
\tikzsetnextfilename{mynd_2}
\begin{myscaletikzwidth}{\textwidth}
\begin{tikzpicture}[scale=\tikzscale]
\draw[->] (0,0) -- (4.5,0) node[right] {$t$};
\draw[->] (0,0) -- (0,3) node[above] {$s\left(t\right)$};
\draw plot[domain=0:4.5,smooth] (\x,{1 + sin(\x r)});
\end{tikzpicture}
\end{myscaletikzwidth}
\caption{}
\end{subfigure}
\end{figure}
\lipsum[1]
\end{document}