![如何将未知键作为选项传递给 TikZ 图片?](https://linux22.com/image/238695/%E5%A6%82%E4%BD%95%E5%B0%86%E6%9C%AA%E7%9F%A5%E9%94%AE%E4%BD%9C%E4%B8%BA%E9%80%89%E9%A1%B9%E4%BC%A0%E9%80%92%E7%BB%99%20TikZ%20%E5%9B%BE%E7%89%87%EF%BC%9F.png)
我尝试使用 pgfkeys 编写一个接受选项的命令。未知键以一种样式收集,我尝试将其用作 tikzpicture 环境的全局选项。一个最小的例子是:
\documentclass{article}
\usepackage{tikz}
\newif\ifsquare
\pgfqkeys{/test}{%
square/.is if=square,
square/.default=true,
% collect unknown keys in style 'remainingkeys':
.unknown/.code={%
\let\currname\pgfkeyscurrentname%
\let\currval\pgfkeyscurrentvalue%
\ifx#1\pgfkeysnovalue%
\pgfqkeys{/tikz}{remainingkeys/.append style={\currname}}%
\else%
\pgfqkeys{/tikz}{remainingkeys/.append style={\currname=\currval}}%
\fi%
}%
}
\newcommand\myfigure[1][]{
% initialize:
\pgfqkeys{/tikz}{remainingkeys/.style={}}
\pgfqkeys{/test}{square}
% set user keys:
\pgfqkeys{/test}{#1}
\begin{tikzpicture}[/tikz/remainingkeys]
\ifsquare
\fill (0,0)rectangle(1,1);
\else
\fill (0,0)rectangle(1.2,.8);
\fi
\end{tikzpicture}
}
\begin{document}
\myfigure[square,rotate=45] % rotated 45 degs; ok
\myfigure[square,fill=red] % red; ok
\myfigure[square,rotate=45,fill=red] % red, but doesn't rotate
\myfigure[square=false] % not square
\myfigure[square=false,fill=red,rotate=45] % not square, not red and rotated 90 degs!
\end{document}
命令 \myfigure 只是绘制一个正方形或矩形,具体取决于“square”键的值。此键已正确处理。所有其他选项均由 .unknown/.code 处理程序处理并收集到样式“remainingkeys”中,最终传递给 \begin{tikzpicture}。第一次调用 \myfigure 确实绘制了一个正方形并旋转了它,但第三次调用却没有!不知何故,并非所有未知键都存储在“remainingkeys”中。在第五次调用中,甚至旋转角度也不正确。
我尝试了很多方法,但这是我能想到的最好的方法,至少没有产生任何 TeX 错误。我做错了什么,但是什么?我束手无策了……
答案1
您需要先扩展\currname
和\currval
值。否则,您只是存储了这些宏,而这些宏的定义将会改变。因此,除了最后一个选项之外,您失去了所有其他选项,该选项重复多次,就像您示例中的双重旋转中看到的那样。
\documentclass{article}
\usepackage{tikz}
\newif\ifsquare
\pgfqkeys{/test}{%
square/.is if=square,
square/.default=true,
% collect unknown keys in style 'remainingkeys':
.unknown/.code={%
\let\currname\pgfkeyscurrentname%
\let\currval\pgfkeyscurrentvalue%
\ifx#1\pgfkeysnovalue%
\pgfqkeys{/tikz}{remainingkeys/.append style/.expand once={\currname}}%
\else%
\pgfqkeys{/tikz}{remainingkeys/.append style/.expand twice={\expandafter\currname\expandafter=\currval}}%
\fi%
}%
}
\newcommand\myfigure[1][]{
% initialize:
\pgfqkeys{/tikz}{remainingkeys/.style={}}
\pgfqkeys{/test}{square}
% set user keys:
\pgfqkeys{/test}{#1}
\begin{tikzpicture}[/tikz/remainingkeys]
\ifsquare
\fill (0,0)rectangle(1,1);
\else
\fill (0,0)rectangle(1.2,.8);
\fi
\end{tikzpicture}
}
\begin{document}
\myfigure[square,rotate=45] % rotated 45 degs; ok
\myfigure[square,fill=red] % red; ok
\myfigure[square,rotate=45,fill=red] % red, but doesn't rotate
\myfigure[square=false] % not square
\myfigure[square=false,fill=red,rotate=45] % not square, not red and rotated 90 degs!
\end{document}