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latex tikz/pgfkeys

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latex tikz/pgfkeys

我有以下代码

\documentclass[10pt, a4paper]{article}

\usepackage{nicematrix}
\usepackage{tikz}
\usetikzlibrary{calc}


\makeatletter
\ExplSyntaxOn
\NewDocumentCommand \WhenNotMeasuring { } { \legacy_if:nF {measuring@} }
\makeatother
\ExplSyntaxOff

\let\adding\relax
\pgfkeys{
    /adding/.code=\ifx\adding\relax
    \edef\adding{#1}%
    \else
    \edef\adding{\adding, #1}%
    \fi
}

\begin{document}
\begin{align*}
    \begin{bNiceMatrix}[name=mymatrix]
        1 & 2 & 3 \\
        4 & 5 & 6 \\
        7 & 8 & 9 \\
    \end{bNiceMatrix}
    \WhenNotMeasuring{
        \begin{tikzpicture}[remember picture,overlay]
            \pgfkeys{/adding={2-3/3-3/2}}
            \foreach \x/\y/\z in \adding{
                \draw[->] (mymatrix-\x) ++(.75em,0) -- ++(.75em,0) node [anchor=west]{\tiny x\z} |- ($ (mymatrix-\y) + (0.75em,0) $);
            }
            %\foreach \x/\y in {\pgfkeysvalueof{/mult}}
            %\draw (\x) ++(.75em,0) node [anchor=west]{\tiny \y};
            %\foreach \x/\y in {\pgfkeysvalueof{\swap}}
            %\draw (\x) -- ++(3ex,0) |- (\y);
        \end{tikzpicture}
        }
\end{align*}

\end{document}

但是现在如果我将其移动\pgfkeys{/adding={2-3/3-3/2}}到nicematrix环境中例如

\begin{bNiceMatrix}[name=mymatrix]
        1 & 2 & 3 \\
        4 & 5 & 6 \\ \pgfkeys{/adding={1-3/2-3/2}}
        7 & 8 & 9 \\
    \end{bNiceMatrix}

箭头不再被绘制。

有什么想法知道为什么以及如何解决它？

编辑：

\documentclass[10pt, a4paper]{article}

\usepackage{nicematrix}
\usepackage{tikz}
\usetikzlibrary{calc}


\makeatletter
\ExplSyntaxOn
\NewDocumentCommand \WhenNotMeasuring { } { \legacy_if:nF {measuring@} }
\makeatother
\ExplSyntaxOff

\makeatletter
\pgfkeys{
    /adding/.code=\ifx\tikz@atticus@adding\relax
    \xdef\tikz@atticus@adding{#1}%
    \else
    \xdef\tikz@atticus@adding{\tikz@atticus@adding, #1}%
    \fi,/tikz/.cd,
    reset Gauss/.code=\global\let\tikz@atticus@adding\relax,
    reset Gauss,
    get list/.code=\edef#1{\tikz@atticus@adding},
    get list/.default=\adding,
}
\makeatother

\newenvironment{gaussMatrix}%
{
    \begin{pNiceMatrix}[name=mymatrix]
}%
{
\end{pNiceMatrix}
\WhenNotMeasuring{
    \begin{tikzpicture}[remember picture,overlay,get list=\adding]
        \foreach \x/\y/\z in \adding
        \draw[->] (mymatrix-\x) ++(.75em,0) -- ++(.75em,0) node [anchor=west]{\tiny x\z} |- ($ (mymatrix-\y) + (0.75em,0) $);
        \tikzset{reset Gauss}% <-important
    \end{tikzpicture}
}
    }


    \begin{document}
    \begin{align*}
        \begin{gaussMatrix}
            1 & 1 & 1 & 1 & 1 \\
            2 & 2 & 2 & 2 & 2 \\
            3 & 3 & 3 & 3 & 3 \\
        \end{gaussMatrix}
    \end{align*}

    \end{document}

答案1

您可以通过将宏设为全局宏来解决问题。通常这是应该避免的事情。1如果真的想这样做，通常会引入包含某些特殊字符的宏，传统上是@带有 的\makeatletter宏。然后必须小心地重置列表，而这对于局部定义来说是不必要的。为此，我添加了一个reset Gauss键。所以这是一个原型示例。

\documentclass[10pt, a4paper]{article}

\usepackage{nicematrix}
\usepackage{tikz}
\usetikzlibrary{calc}


\makeatletter
\ExplSyntaxOn
\NewDocumentCommand \WhenNotMeasuring { } { \legacy_if:nF {measuring@} }
\makeatother
\ExplSyntaxOff

\makeatletter
\pgfkeys{
    /adding/.code=\ifx\tikz@atticus@adding\relax
    \xdef\tikz@atticus@adding{#1}%
    \else
    \xdef\tikz@atticus@adding{\tikz@atticus@adding, #1}%
    \fi,/tikz/.cd,
    reset Gauss/.code=\global\let\tikz@atticus@adding\relax,
    reset Gauss,
    get list/.code=\edef#1{\tikz@atticus@adding},
    get list/.default=\adding,
}
\makeatother
\begin{document}
\begin{align*}
    \begin{bNiceMatrix}[name=mymatrix]
        1 & 2 & 3 \\
        4 & 5 & 6 \\ \pgfkeys{/adding={2-3/3-3/2}}
        7 & 8 & 9 \\
    \end{bNiceMatrix}
    \WhenNotMeasuring{
        \begin{tikzpicture}[remember picture,overlay,get list=\adding]            
            \foreach \x/\y/\z in \adding{
                \draw[->] (mymatrix-\x) ++(.75em,0) -- ++(.75em,0) node [anchor=west]{\tiny x\z} |- ($ (mymatrix-\y) + (0.75em,0) $);
            }
        \tikzset{reset Gauss}% <-important
        \end{tikzpicture}
        }
\end{align*}

\end{document}

在此处输入图片描述

这确实有效。但是，正如作者 F. Patigny 给出的几个出色答案一样nicematrix，我认为更简洁的方法可能是在包中内置一些官方钩子nicematrix（如果它们尚不存在）以获得更简洁、更安全的代码。我写这篇文章只是因为你在评论中询问。

1 pgf的未来版本将能够一定程度上解决这个问题：https://tex.stackexchange.com/a/491246。

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