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如何在 Tikz 中搜索数组中的元素？

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如何在 Tikz 中搜索数组中的元素？

我正在尝试将一个值（第一个输入参数）和一个数组（第二个输入参数）传递给 Tikzset，我想检查该值是否在数组中。每次运行代码时，都会将数组作为整体读取，而不是逐个元素读取。这里，颜色填充是进行搜索，然后调用我之前定义的其他 Tikzset。当我使用 Ifnum 时，只将值作为输入和一个数字，一切都运行正常，但我在数组输入方面遇到了困难。

\begin{figure*}[h]
\begin{adjustbox}{minipage=\textwidth,scale=0.8}
\begin{tikzpicture}[node distance = 2cm, on grid,>={Stealth[inset=0pt,length=6pt,angle'=28,round]},fill fraction/.style n args={2}{path picture={
        \fill[#1] (path picture bounding box.center) -- (path picture bounding box.south)  arc [start angle=-90, delta angle=-100, radius=1] -- cycle;
        \fill[#2] (path picture bounding box.center) -- (path picture bounding box.south)  arc [start angle=-90, delta angle=100, radius=1] -- cycle;
        }}
,fill fraction2/.style n args={1}{path picture={
        \fill[#1] (path picture bounding box.center) -- (path picture bounding box.south)  arc [start angle=-90, delta angle=-180, radius=1] -- cycle;
        }}
        ]
        
\tikzset{
redfill/.code args={}{
\definecolor{mycolour1}{rgb}{1,0,0}%
\pgfkeysalso{/tikz/fill=mycolour1}
  }
}
\tikzset{
greenfill/.code args={}{
\definecolor{mycolour2}{rgb}{0,1,0}%
\pgfkeysalso{/tikz/fill=mycolour2}
  }
}
\tikzset{
bluefill/.code args={}{
\definecolor{mycolour3}{rgb}{0,0,1}%
\pgfkeysalso{/tikz/fill=mycolour3}
  }
}

\tikzset{colorfill/.code n args={2}{
\foreach \x in {#2}{
\ifnum \x = #1
        \tikzset{greenfill={}}
    \else
        \tikzset{redfill={}}
    \fi
}

}}

\def\greenstatesind{
{2,4}
}
\def\redstatesind{
3
}

\node[state,initial](q1){$q^{1}$};
\foreach \i[evaluate=\i as \j using int(\i-1),evaluate=\i as \k using int(\i)] in {2,...,5}{
    \node[state, right of=q\j, colorfill={\k},{\greenstatesind}] (q\i){$q^{\i}$};
    }
\end{tikzpicture}
\end{adjustbox}
\end{figure*}

答案1

有几个小问题，比如不可见空格等，这些问题很容易解决。如果您想使用循环来查看列表中是否包含给定元素，则还有两个更微妙的问题：

  1. 如果想要密切关注您提供的代码，则必须使用密钥/.expanded以免混淆 pgf。
  2. \tikzset{}如果在循环中使用foreach，则不起作用，因为\tikzset是本地的并且foreach使用组。但是，/.list密钥不构成这些组，因此可以改用。

此代码实现了这些更改，并完成了提供给完整文档的片段。

\documentclass{article}
\usepackage{geometry}
\usepackage{adjustbox}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,automata,positioning}
\begin{document}
\begin{figure*}[h]
    \begin{adjustbox}{minipage=\textwidth,scale=0.8}
    \begin{tikzpicture}[node distance = 2cm, on grid,>={Stealth[inset=0pt,length=6pt,angle'=28,round]},fill fraction/.style n args={2}{path picture={
            \fill[#1] (path picture bounding box.center) -- (path picture bounding box.south)  arc [start angle=-90, delta angle=-100, radius=1] -- cycle;
            \fill[#2] (path picture bounding box.center) -- (path picture bounding box.south)  arc [start angle=-90, delta angle=100, radius=1] -- cycle;
            }}
    ,fill fraction2/.style n args={1}{path picture={
            \fill[#1] (path picture bounding box.center) -- (path picture bounding box.south)  arc [start angle=-90, delta angle=-180, radius=1] -- cycle;
            }}
            ]
            
    \tikzset{
    redfill/.code={%  args={}{....} is at the very least unnecessary
    \definecolor{mycolour1}{rgb}{1,0,0}%
    \pgfkeysalso{/tikz/fill=mycolour1}
      }
    }
    \tikzset{%
    greenfill/.code={%  args={}{....} is at the very least unnecessary
    \definecolor{mycolour2}{rgb}{0,1,0}%
    \pgfkeysalso{/tikz/fill=mycolour2}
    }
    }
    \tikzset{
    bluefill/.code={%  args={}{....} is at the very least unnecessary
    \definecolor{mycolour3}{rgb}{0,0,1}%
    \pgfkeysalso{/tikz/fill=mycolour3}
      }
    }
    
    \tikzset{colorfill sub/.code={\ifnum\pgfkeysvalueof{/tikz/colorfill item}=#1\relax
            \tikzset{greenfill}% greenfill has no argument
        \else
            \pgfkeysalso{/tikz/redfill}% redfill has no argument
        \fi},
        colorfill item/.initial=0,
        colorfill/.code n args={2}{%
        \tikzset{colorfill item=#1,colorfill sub/.list=#2}%
         }    
    }
    
    \def\greenstatesind{%
    {2,4}%
    }
    \def\redstatesind{%
    {3}%
    }
    
    \node[state,initial](q1){$q^{1}$};
    \foreach \i[evaluate=\i as \j using int(\i-1),evaluate=\i as \k using int(\i)] in {2,...,5}{
        \node[state,right of=q\j,colorfill/.expanded={\k}{\greenstatesind}% removed comma and added /.expanded
        ] (q\i){$q^{\i}$};
        }
    \end{tikzpicture}
    \end{adjustbox}
    \end{figure*}
\end{document}

在此处输入图片描述

请注意，这项任务很可能可以大大简化。pgf 有\pgfutil@in@一个低级成员资格测试，在 pgf 中被广泛使用。我不知道它是否为此类测试提供了用户界面。

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