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如何在 pgfkeys 中设置可选参数

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如何在 pgfkeys 中设置可选参数

我想知道是否有任何方法\pgfkeys可以tikz定义可选参数，如下面的代码所示：

代码：

\documentclass[a4paper]{article}
\usepackage{pgf,graphicx}
\usepackage{geometry}
\geometry{showframe}
\geometry{left=1cm,right=1cm,top=1cm,bottom=1cm}
\parindent0pt


\begin{document}
% #1 for optional args in the macro \includegraphics, "width=\linewidth", for example
% #2 is the name of an picture file

\pgfkeys{
  c/.code args={[#1]{#2}}{\includegraphics[#1]{#2}}
  }
\pgfkeys{c={logob}}%Same as \includegraphics{logob} 
% The above code does not work because #1 is not given. How to make it work when optional args are not given?
\end{document}

答案1

类似下面的方法可以工作。key/c接受单个参数，然后\includegraphics根据 key 的值是否以 开头，调用不同形式的[。

\documentclass{article}
\usepackage{graphicx}
\usepackage{pgfkeys}

\begin{document}
\makeatletter
\pgfkeys{
  c/.code={%
    \@ifnextchar[%]
      {\includegraphics#1\mykeys@gobble@til@nil}
      {\includegraphics{#1}\mykeys@gobble@til@nil}%
    #1\@nil
  }
}

\long\def\mykeys@gobble@til@nil#1\@nil{}
\makeatother

\pgfkeys{c={example-image}}
% Same as \includegraphics{...}

\pgfkeys{c={[width=3cm]{example-image}}}
% Same as \includegraphics[width=3cm]{...}
\end{document}

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