如何使 Tikz 库的参数成为可选参数？

Question

我正在制作一个 tikz 库，我想使用一个可选参数。到目前为止，我有以下代码

该tikzlibraryquestion.code.tex文件是

\usepackage{question}

\tikzset{
 question/.pic={
   \question@draw
  },
}

有一个question.sty文件

\ProvidesPackage{question}

\RequirePackage{tikz}


\newcommand*{\mycircle}[1][]{
    \tikzset{%
        /mycircle/.cd,#1}\mycircle@draw%
}

\tikzset{
    /mycircle/.cd,
    /mycircle/tilt/.code = 0    \def\mycircle@tilt{#1},
}

\def\mycircle@draw{
    \draw (0, 0) circle (1);
    \begin{scope}[rotate=\mycircle@tilt]
         \draw (0, 0) -- (0, 1);
    \end{scope}
}

最后，使用示例

\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{question}

\begin{document}
\begin{tikzpicture}
\mycircle[tilt=23]
\end{tikzpicture}

\begin{tikzpicture}
\mycircle
\end{tikzpicture}
\end{document}

我如何更改.sty文件以使tilt参数成为可选的？

Answer 1

您只需使用pic.即可pic实现这一点。

\documentclass{standalone}
% you can put the following three lines in a package, of course
\usepackage{tikz}
\tikzset{pics/my circle/.style={code={
        \draw (0,1) -- (0, 0) circle [radius=1];}}}
\begin{document}
\begin{tikzpicture}
\pic[rotate=23]{my circle};
\end{tikzpicture}

\begin{tikzpicture}
\pic{my circle};
\end{tikzpicture}

\begin{tikzpicture}
\pic[red,dashed,scale=2,rotate=-33]{my circle};
\end{tikzpicture}
\end{document}

如您所见，您可以根据需要添加任意数量的可选参数。

如需更多高级选项，请使用 pgf 键。例如：

\documentclass{standalone}
% you can put the following three lines in a package, of course
\usepackage{tikz}
\tikzset{pics/my circle/.style={code={%
        \tikzset{my circle/.cd,#1}%
        \def\pv##1{\pgfkeysvalueof{/tikz/my circle/##1}}%
        \draw[pic actions,my circle/line] (0,1) -- (0, 0);
        \draw[pic actions,my circle/circle] (0,0) circle [radius=1];}},
        my circle/.cd,line/.style={},circle/.style={}}
\begin{document}
\begin{tikzpicture}
\pic[rotate=23]{my circle};
\end{tikzpicture}

\begin{tikzpicture}
\pic{my circle={line/.style={dashed,thick,blue}}};
\end{tikzpicture}


\begin{tikzpicture}
\pic[rotate=123,red] {my circle={line/.style={dashed,thick,blue}}};
\end{tikzpicture}

\begin{tikzpicture}
\pic[red,dashed,scale=2,rotate=-33]{my circle};
\end{tikzpicture}
\end{document}