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Tikz：如何避免库和用户之间的层冲突

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Tikz：如何避免库和用户之间的层冲突

在 tikz 中，用户可以使用以下方式声明新图层：

\pgfdeclarelayer{foo}
\pgfdeclarelayer{bar}
\pgfsetlayers{foo,bar}

我的库需要声明一些层（目前只有 2 个），但我担心会与用户层发生冲突。事实上，\pgfsetlayers会删除所有之前创建的层。我该如何解决这个问题，最好对用户透明？

平均能量损失

\documentclass[10pt]{article}
\usepackage{geometry}
\usepackage{tikz}

% My library would declare
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}

% The user would declare this, and erase above layers.
\pgfdeclarelayer{foo}
\pgfdeclarelayer{bar}
\pgfsetlayers{foo,bar}   %% <-- erases background,main,foreground.

\begin{document}

% The user wants to draw
\begin{figure}
  \begin{tikzpicture}
    \begin{pgfonlayer}{bar}
      \node[fill=green]{Hello};
    \end{pgfonlayer}
    \begin{pgfonlayer}{foo}
      \node[fill=blue!50!white,circle] at (0.5,0) {Bye};
    \end{pgfonlayer}
  \end{tikzpicture}
\end{figure}

% The library wants to draw
\begin{figure}
  \begin{tikzpicture}
    \begin{pgfonlayer}{foreground}
      \node[fill=green]{Hello};
    \end{pgfonlayer}
    \begin{pgfonlayer}{background}
      \node[fill=blue!50!white,circle] at (0.5,0) {Bye};
    \end{pgfonlayer}
  \end{tikzpicture}
\end{figure}

\end{document}

答案1

由于\pgfsetlayers它在本地起作用，所以永远不要在全局使用它。始终将其放在要使用它的环境或组中。

\documentclass[10pt]{article}
\usepackage{geometry}
\usepackage{tikz}

% My library would declare
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}

% The user would declare this, and erase above layers.
\pgfdeclarelayer{foo}
\pgfdeclarelayer{bar}


\begin{document}

% The user wants to draw
\begin{figure}
  \pgfsetlayers{foo,bar}   %% <-- erases background,main,foreground.
  \begin{tikzpicture}
    \begin{pgfonlayer}{bar}
      \node[fill=green]{Hello};
    \end{pgfonlayer}
    \begin{pgfonlayer}{foo}
      \node[fill=blue!50!white,circle] at (0.5,0) {Bye};
    \end{pgfonlayer}
  \end{tikzpicture}
\end{figure}

% The library wants to draw
\begin{figure}
  \pgfsetlayers{background,main,foreground}
  \begin{tikzpicture}
    \begin{pgfonlayer}{foreground}
      \node[fill=green]{Hello};
    \end{pgfonlayer}
    \begin{pgfonlayer}{background}
      \node[fill=blue!50!white,circle] at (0.5,0) {Bye};
    \end{pgfonlayer}
  \end{tikzpicture}
\end{figure}

\end{document}

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