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未定义控制序列 \pgfmath@

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未定义控制序列 \pgfmath@

为什么下面的代码会给出这个错误信息？

错误

错误：未定义控制序列。

--- TeX 说 --- \pgfmath@dimen@ ...men@@ #1=0.0pt\relax \pgfmath@

l.28 \draw (\getWickersonLeft{c},0) -- (\getWickersonRight{c},5);

代码

\documentclass{article}

\usepackage{tikz}

\pgfkeys{/wickersons/.cd,
  execute style/.style={#1},                           
  execute macro/.style={execute style/.expand once=#1}, 
  left/.code={\gdef\wickersonsleft{#1}},
  right/.code={\gdef\wickersonsright{#1}}
}

\def\getWickersonLeft#1{\csname wickerson#1left\endcsname}
\def\getWickersonRight#1{\csname wickerson#1right\endcsname}

\newcommand*\defWickersonMacros[3]{%
  \expandafter\edef\csname wickerson#1left\endcsname{#2}
  \expandafter\edef\csname wickerson#1right\endcsname{#3}
}

\begin{document}

\begin{tikzpicture}[x=1mm,y=-1mm]%
  \foreach \x/\xvalue in {c/{left=67,right=77}} { 
    \pgfkeys{/wickersons/.cd, execute macro=\xvalue} 
    \expandafter\defWickersonMacros{c}{\wickersonsleft}{\wickersonsright}
  }
  \draw (\getWickersonLeft{c},0) -- (\getWickersonRight{c},5);
\end{tikzpicture}

\end{document}

答案1

我宁愿使用\pgfkeysvalueof定义事物的方式。这是一种非常复杂的方法，可以避免真正的力量，pgfkeys因为你使用的是虚拟宏而不是键。考虑将所有选项发送给属于一个系列的某些键。

这里的问题是宏的参数在另一个定义中使用，因此#字符应该加倍。

\documentclass{article}

\usepackage{tikz}

\pgfkeys{/wickersons/.cd,
  execute style/.style={#1},                           
  execute macro/.style={execute style/.expand once=#1}, 
  left/.code={\xdef\wickersonsleft{#1}},
  right/.code={\xdef\wickersonsright{#1}}
}

\edef\getWickersonLeft#1{\csname wickerson#1left\endcsname}
\edef\getWickersonRight#1{\csname wickerson#1right\endcsname}

\newcommand*\defWickersonMacros[3]{%
  \expandafter\xdef\csname wickerson##1left\endcsname{#2}% Double ##
  \expandafter\xdef\csname wickerson##1right\endcsname{#3}% Double ##
}

\begin{document}

\begin{tikzpicture}[x=1mm,y=-1mm]%
  \foreach \x/\xvalue in {c/{left=67,right=77}} { 
    \pgfkeys{/wickersons/.cd, execute macro=\xvalue} 
    \defWickersonMacros{c}{\wickersonsleft}{\wickersonsright}
  }

\draw (\getWickersonLeft{c},0) -- (\getWickersonRight{c},5);
\end{tikzpicture}

\end{document}

输出 ：）

在此处输入图片描述

答案2

后敲击有已回答你的问题是，我想给你一个关于如何使用 PGF 键和 TikZ 的功能来处理你的列表的替代方法。

部分代码受到您最近提出的另一个问题的启发。

代码

\documentclass[tikz]{standalone}
\makeatletter
\pgfqkeys{/wickersons}{
  add path/.code args={#1}{%
    \begingroup% a group so the initial values don't need to be repeated but can be set in a scope above
      \pgfqkeys{/wickersons/path vars}{#1}% set only the keys that are given in '#1', other wise the current value will be used (probably the .initial one)
      % now expand everything (but the label which may contain unexpandable stuff, we only want to expand that once)
      \edef\pgf@tempa{{\pgfkeysvalueof{/wickersons/path vars/name}/.style={insert path={%
            (\pgfkeysvalueof{/wickersons/path vars/left},0) -- node [every wickersons label/.try] {\unexpanded\expandafter{\wickersons@pathvars@label}}
            (\pgfkeysvalueof{/wickersons/path vars/right},5)}}}}%
      % and get it out of this group
      \pgfmath@smuggleone\pgf@tempa
    \endgroup
    % the 'path vars' now contain all there values before 'add path' was used
    %
    % have you seen the extra pair of braces in \pgf@tempa? Those where necessary, otherwise I had to use
    % \expandafter\tikzset\expandafter{\pgf@tempa}
    % here
    \expandafter\tikzset\pgf@tempa
  },
  path vars/.cd,
   name/.initial=path,% if 'add path' has been used without the 'name' key the style would have been named 'path'
   left/.initial=0,   % if 'add path' has been used without the 'left' key the left point would have started at (0,0)
   right/.initial=0,  % ...
   label/.store in=\wickersons@pathvars@label,% or toks
   label=%            % ...
}
\makeatother
\begin{document}
\begin{tikzpicture}[
 x=1mm,
 y=-1mm,
 ->,
 thick,
 every wickersons label/.style={midway, above, sloped},
 /wickersons/add path/.list={%
   {name=foo, left= 2, right=23, label=horse},%
   {name=bar, left=25, right=29, label=sheep},%
   {name=baz, left=31,           label=\textbf{zebra}}%
 }]

  \draw [every wickersons label/.append style={pos=.2}] [foo];
  \draw [bar];
  \draw [every wickersons label/.append style={pos=.4}] [baz]; % uses right=0
\end{tikzpicture}
\end{document}

输出

在此处输入图片描述

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