tikz 的图例

Question

这是我需要制作的图例，但我无法让列之间的空间发挥作用。它们需要均匀分布，而不能占用边距。我也想知道如何在标题中做到这一点。

\documentclass{article}
\usepackage{tikz}
\usepackage{lipsum}
\usetikzlibrary{automata, backgrounds,calc,shapes}
\usepackage{subfig}
\makeatletter
\tikzset{circle split part fill/.style args={#1,#2}{%
 alias=tmp@name, 
  postaction={%
    insert path={
     \pgfextra{%
     \pgfpointdiff{\pgfpointanchor{\pgf@node@name}{center}}%
                  {\pgfpointanchor{\pgf@node@name}{east}}%
     \pgfmathsetmacro\insiderad{\pgf@x}
      \fill[#1] (\pgf@[email protected]) ([xshift=-\pgflinewidth]\pgf@[email protected]) arc
                          (0:180:\insiderad-\pgflinewidth)--cycle;
      \fill[#2] (\pgf@[email protected]) ([xshift=\pgflinewidth]\pgf@[email protected])  arc
                           (180:360:\insiderad-\pgflinewidth)--cycle;            %  \end{scope}
         }}}}}
 \makeatother
\begin{document}
\definecolor{yes}{RGB}{255,51,76}
\definecolor{no}{RGB}{161,251,251}
    \begin{figure}[ht]
    \centering
\tikzset{shorten >=1pt,
        node distance=.55cm,
        font = \scriptsize,
        auto,%on grid
        state/.style = {shape=circle,thick,draw,minimum width=+1.7ex,minimum height=+1.4ex,inner sep=+.1pt}
        }
\begin{tikzpicture}% note that \tiny gets inherited from above    
\matrix[column sep=.2ex,draw]{ \draw[->,thick] (-1.2em,1em) -- (-1.2em,0); \draw[->,thick] (-1em,0.5em) -- (0,0.5em)
node[right] {\bf go forward};
 & 
 \draw[<-, thick] (-1.2em,1em) -- (-1.2em,0); \draw[<-,thick] (-1em,0.5em) -- (0,0.5em)
node[right] {\bf{go backward}}; 
& \draw (-0.2em,0)  edge [thick,in=150,out=80,loop] (-0.2em,0);
\path (0,0.5em) node[thick, right] {\bf{stay}};
& \node[state,fill=yes,label=right:\bf{yes}]{};\\
& \node[state,fill=no,label=right: \bf{no}]{};
& \node[state,circle split part fill={no,yes},label=right:\bf{Both}]{};
& \node[state,fill = gray,label=right:\bf{allocated in previous cohorts}]{};
& \node[state,fill = white,label=right: \bf{not allocated yet}]{};
;\\
};
\end{tikzpicture} 
\caption{my figure}   
\end{figure}
\end{document}

Answer 1

这是一个快速编写的提案。主要内容是用 替换\bf，node font=\bfseries并尝试将宽度相似的元素放在同一列中。不过仍有改进的空间。

\documentclass{article}
\usepackage{tikz}
\usepackage{lipsum}
\usetikzlibrary{automata, backgrounds,calc,shapes}
\usepackage{subfig}
\makeatletter
\tikzset{circle split part fill/.style args={#1,#2}{%
 alias=tmp@name, 
  postaction={%
    insert path={
     \pgfextra{%
     \pgfpointdiff{\pgfpointanchor{\pgf@node@name}{center}}%
                  {\pgfpointanchor{\pgf@node@name}{east}}%
     \pgfmathsetmacro\insiderad{\pgf@x}
      \fill[#1] (\pgf@[email protected]) ([xshift=-\pgflinewidth]\pgf@[email protected]) arc
                          (0:180:\insiderad-\pgflinewidth)--cycle;
      \fill[#2] (\pgf@[email protected]) ([xshift=\pgflinewidth]\pgf@[email protected])  arc
                           (180:360:\insiderad-\pgflinewidth)--cycle;            %  \end{scope}
         }}}}}
 \makeatother
\begin{document}
\definecolor{yes}{RGB}{255,51,76}
\definecolor{no}{RGB}{161,251,251}
    \begin{figure}[ht]
    \centering
\tikzset{shorten >=1pt,
        node distance=.55cm,
        font = \scriptsize,
        auto,%on grid
        state/.style = {shape=circle,thick,draw,minimum width=+1.7ex,minimum height=+1.4ex,inner sep=+.1pt}
        }
\begin{tikzpicture}% note that \tiny gets inherited from above    
\matrix[column sep=.2ex,draw,nodes={node font=\bfseries},every label/.append
style={node font=\bfseries}]{ 
\draw[->,thick] (-1.2em,1em) -- (-1.2em,0); \draw[->,thick] (-1em,0.5em) -- (0,0.5em)
node[right] {go forward};
& \draw (-0.2em,0)  edge [thick,in=150,out=80,loop] (-0.2em,0);
\path (0,0.5em) node[right] {stay~~};
& \path (-1ex,0.5em) node[state,fill=no,label=right: no]{}; 
& \path (-1ex,0.5em)  node[state,fill = gray,label=right:allocated in previous cohorts]{};\\
\draw[<-, thick] (-1.2em,1em) -- (-1.2em,0); \draw[<-,thick] (-1em,0.5em) -- (0,0.5em)
node[right] {go backward}; 
& \path (-1ex,0.5em) node[state,fill=yes,label=right:yes]{};
& \path (-1ex,0.5em) node[state,circle split part fill={no,yes},label=right:Both~~]{};
& \path (-1ex,0.5em) node[state,fill = white,label=right:not allocated yet]{};
;\\
};
\end{tikzpicture} 
\caption{my figure}   
\end{figure}
\end{document}