检测是否位于 tikzpicture 节点内

Question

我想检测宏是否在 tikzpicture 内部执行，或者更具体地说是在图片节点内部执行。在我的 MWE 中，我使用了\ifpgfpicture它，但它无法完成这项工作，因为它将节点内容视为图片的“外部”。我希望将“INSIDE”视为节点文本。

我并不想在环境中添加任何内容，比如tikzpicture一些every picture技巧来记住我们在环境中。是否有任何现有的状态宏/变量可以用于此目的？pgftikz

\documentclass{article}
\usepackage{tikz}

\newcommand{\testinpic}{%
  \ifpgfpicture INSIDE \else OUTSIDE\fi%
}

\begin{document}

\testinpic

\begin{tikzpicture}
  \fill[blue!10!white] (-4,-1) rectangle (4,1);
  \node {\testinpic};
\end{tikzpicture}

\end{document}

Answer 1

你可以做

\documentclass{article}
\usepackage{tikz}


\makeatletter
\newcommand{\testinpic}{%
  \ifx\pgfpictureid\@undefined OUTSIDE \else INSIDE\fi%
}
\makeatother

\begin{document}

\testinpic

\begin{tikzpicture}
  \fill[blue!10!white] (-4,-1) rectangle (4,1);
  \node {\testinpic};
\end{tikzpicture}

\end{document}

Answer 2

可能存在一些像这样的不明智的黑客行为？如果嵌套多次，就会造成混乱。

\documentclass{standalone}
\usepackage{tikz}

\makeatletter
\newif\iftikzinsidepicture
\newif\iftikzinsidenode
\def\tikz@picture[#1]{%
  \pgfpicture%
  \tikzinsidepicturetrue%
  \let\tikz@atbegin@picture=\pgfutil@empty%
  \let\tikz@atend@picture=\pgfutil@empty%
  \let\tikz@transform=\relax%
  \def\tikz@time{.5}%
  \tikz@installcommands\scope[every picture,#1]%
  \expandafter\tikz@atbegin@picture%
  \tikz@lib@scope@check%
}

\let\tikz@do@fig@main@orig=\tikz@fig@main
\def\tikz@fig@main{%
    \tikzinsidepicturefalse%
    \tikzinsidenodetrue%
    \tikz@do@fig@main@orig%
}
\makeatother

\def\test{{\footnotesize
    \iftikzinsidenode
        INSIDE-NODE
        \iftikzinsidepicture 
            INSIDE-NODE-PICTURE
        \else
            OUTSIDE-NODE-PICTURE
        \fi
    \else%
        \iftikzinsidepicture 
            INSIDE-PICTURE
            OUTSIDE-NODE
        \else
            OUTSIDE-PICTURE
        \fi
    \fi}}

\begin{document}

\begin{tabular}{l}

\test \\    

\begin{tikzpicture}

\fill[blue!20] (-4,-1) rectangle (4,1);
\pgftext{\test}

\node [fill=red!20] at (0,-0.5){\test};

\node [fill=white] at (0,0.5){ \tikz{\pgftext{\test}} };

\end{tikzpicture}

\end{tabular}
\end{document}