我正在尝试通过外部化 Ti 来缩短编译时间钾Z 图片。不过，我似乎能够引用命名节点。例如，考虑以下内容。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{external}
\tikzexternalize
\begin{document}
\tikz \coordinate (A) at (0,0);
\tikz \coordinate [right=of A] (B);
\end{document}
当我尝试用编译它时pdflatex -shell-escape presention.tex，我收到消息
===== Image 'presentation-figure0' is up-to-date. ======
===== 'mode=convert with system call': Invoking 'pdflatex -shell-escape -halt-o
n-error -interaction=batchmode -jobname "presentation-figure1" "\def\tikzextern
alrealjob{presentation}\input{presentation}"' ========
\openout3 = `presentation.auxlock'.
runsystem(pdflatex -shell-escape -halt-on-error -interaction=batchmode -jobname
"presentation-figure1" "\def\tikzexternalrealjob{presentation}\input{presentat
ion}")...executed.
\openout3 = `presentation.auxlock'.
! Package tikz Error: Sorry, the system call 'pdflatex -shell-escape -halt-on-e
rror -interaction=batchmode -jobname "presentation-figure1" "\def\tikzexternalr
ealjob{presentation}\input{presentation}"' did NOT result in a usable output fi
le 'presentation-figure1' (expected one of .pdf:.jpg:.jpeg:.png:). Please verif
y that you have enabled system calls. For pdflatex, this is 'pdflatex -shell-es
cape'. Sometimes it is also named 'write 18' or something like that. Or maybe t
he command simply failed? Error messages can be found in 'presentation-figure1.
log'. If you continue now, I'll try to typeset the picture.
和presentation.log消息
! Package pgf Error: No shape named A is known.
See the pgf package documentation for explanation.
Type H <return> for immediate help.
...
l.14 \tikz \coordinate [right=of A] (B);
在 中presentation-figure1.log。我尝试参考手册和互联网来找出问题所在，但毫无进展。我知道该external包无法轻松处理引用，但我找不到有关命名节点的任何信息。
注意命名节点在不同的 Ti钾Z 图片，因为在我的真实代码中，我在整个文档的许多不同的图片中引用它们。
答案1
简短回答：使用“已知”技术无法做到这一点。要正确执行此操作，您需要将坐标位置保存到文件中，然后在编译开始时将其读回。
但是，如果坐标都是在文档开头的几个简单图片中定义的，则只需关闭这些图片的外部化，然后所有后续图片都可以使用这些坐标，无论是否外部化。
以下内容编译无错误，且第二张图片被外部化：
\documentclass{article}
%\url{http://tex.stackexchange.com/q/296865/86}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{external}
\tikzexternalize
\begin{document}
\tikzset{external/export next=false}
\tikz \coordinate (A) at (0,0);
\tikz \coordinate [right=of A] (B);
\end{document}
答案2
使用环境tikzpicture如果要外部化 Ti，钾Z图形并参考现有节点/坐标：
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{external}
\tikzexternalize
\begin{document}
Hi
\begin{tikzpicture}
\coordinate (A) at (0,0);
\coordinate [right=of A] (B);
\draw (A)--(B)--+(45:1);
\end{tikzpicture}
\end{document}
