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调整森林中的叶子大小

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调整森林中的叶子大小

我正在尝试使用森林包绘制一些树。出于某种原因，树叶的大小会根据树有多少片树叶而不同（见图）。

我想让图片中三棵树的每片叶子都大小相同。我该怎么做？在此处输入图片描述

我的代码如下：

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{forest}

\begin{document}
\begin{figure}[t]
\centering
\begin{forest}
for tree={circle,draw}
[
    [, edge label={node[midway,left] {0}} 
      [$S^e_0$,edge label={node[midway,left] {0}} ] 
      [$S^e_1$,edge label={node[midway,right] {1}} ] 
    ]
    [, edge label={node[midway,right] {1}}
      [$S^e_2$,edge label={node[midway,left] {0}} ] 
      [$S^e_3$,edge label={node[midway,right] {1}} ] 
  ] 
]
\end{forest}

\begin{forest}
for tree={circle,draw}
[
    [, edge label={node[midway,left] {0}} 
      [, edge label={node[midway,left] {0}}
        [$S^{e+1}_0$, edge label={node[midway,left] {0}}]
        [$S^{e+1}_1$, edge label={node[midway,right] {1}}]
        ]
      [$S^{e+1}_2$, edge label={node[midway,right] {1}} ] 
    ]
    [, edge label={node[midway,right] {1}}
      [$S^{e+1}_3$,edge label={node[midway,left] {0}} ] 
      [$S^{e+1}_4$,edge label={node[midway,right] {1}} ] 
  ] 
]
\end{forest}
\begin{forest}
for tree={circle,draw}
[
    [, edge label={node[midway,left] {0}} 
      [$S^{e+2}_0$,edge label={node[midway,left] {0}} ] 
      [$S^{e+2}_1$,edge label={node[midway,right] {1}} ] 
    ]
    [$S^{e+2}_2$, edge label={node[midway,right] {1}} ]
]
\end{forest}
\caption{...} \label{fig:...}
\end{figure}
\end{document}

答案1

具有适当的值minimum size：

在此处输入图片描述

\documentclass{article}
\usepackage{forest}

\begin{document}


\begin{figure}[t]
\centering
\begin{forest}
for tree={circle,draw}
[
    [, edge label={node[midway,left] {0}} 
      [$S^e_0$,minimum size=3em,edge label={node[midway,left] {0}} ] 
      [$S^e_1$,minimum size=3em,edge label={node[midway,right] {1}} ] 
    ]
    [, edge label={node[midway,right] {1}}
      [$S^e_2$,minimum size=3em,edge label={node[midway,left] {0}} ] 
      [$S^e_3$,minimum size=3em,edge label={node[midway,right] {1}} ] 
  ] 
]
\end{forest}

\begin{forest}
for tree={circle,draw}
[
    [, edge label={node[midway,left] {0}} 
      [, edge label={node[midway,left] {0}}
        [$S^{e+1}_0$,minimum size=3em, edge label={node[midway,left] {0}}]
        [$S^{e+1}_1$, minimum size=3em,edge label={node[midway,right] {1}}]
        ]
      [$S^{e+1}_2$, minimum size=3em,edge label={node[midway,right] {1}} ] 
    ]
    [, edge label={node[midway,right] {1}}
      [$S^{e+1}_3$,minimum size=3em,edge label={node[midway,left] {0}} ] 
      [$S^{e+1}_4$,minimum size=3em,edge label={node[midway,right] {1}} ] 
  ] 
]
\end{forest}
\begin{forest}
for tree={circle,draw}
[
    [, edge label={node[midway,left] {0}} 
      [$S^{e+2}_0$,minimum size=3em,edge label={node[midway,left] {0}} ] 
      [$S^{e+2}_1$,minimum size=3em,edge label={node[midway,right] {1}} ] 
    ]
    [$S^{e+2}_2$, minimum size=3em,edge label={node[midway,right] {1}} ]
]
\end{forest}
\caption{...} 
\label{fig:...}
\end{figure}


\end{document}

答案2

这也使用minimum width类似leandriis 的回答但将其附加到所有没有子节点的节点。通过定义一种在所有树中使用的样式，可以实现进一步的简化。

\documentclass{article}
\usepackage{forest}
\forestset{my tree/.style={for tree={circle,
    draw,
    where n children=0{minimum width=3em}{}}}}
\begin{document}
\begin{figure}[t]
\centering
\begin{forest}
my tree
[
    [, edge label={node[midway,left] {0}} 
      [$S^e_0$,edge label={node[midway,left] {0}} ] 
      [$S^e_1$,edge label={node[midway,right] {1}} ] 
    ]
    [, edge label={node[midway,right] {1}}
      [$S^e_2$,edge label={node[midway,left] {0}} ] 
      [$S^e_3$,edge label={node[midway,right] {1}} ] 
  ] 
]
\end{forest}

\begin{forest}
my tree
[
    [, edge label={node[midway,left] {0}} 
      [, edge label={node[midway,left] {0}}
        [$S^{e+1}_0$, edge label={node[midway,left] {0}}]
        [$S^{e+1}_1$, edge label={node[midway,right] {1}}]
        ]
      [$S^{e+1}_2$, edge label={node[midway,right] {1}} ] 
    ]
    [, edge label={node[midway,right] {1}}
      [$S^{e+1}_3$,edge label={node[midway,left] {0}} ] 
      [$S^{e+1}_4$,edge label={node[midway,right] {1}} ] 
  ] 
]
\end{forest}
~
\begin{forest}
my tree
[
    [, edge label={node[midway,left] {0}} 
      [$S^{e+2}_0$,edge label={node[midway,left] {0}} ] 
      [$S^{e+2}_1$,edge label={node[midway,right] {1}} ] 
    ]
    [$S^{e+2}_2$, edge label={node[midway,right] {1}} ]
]
\end{forest}
\caption{...} 
\label{fig:...}
\end{figure}
\end{document}

在此处输入图片描述

$您可以使用来消除添加符号的需要math content，但在这个例子中，我个人会发现这会令人困惑。

答案3

基于我的答案，简化了边标签的书写，并对树进行了稍微的重新设计：

\documentclass{article}
\usepackage{forest}

\begin{document}
\begin{figure}[t]
\tikzset{Circle/.style = {circle, draw, minimum size=8pt, inner sep=0pt}}
\forestset{
  EL/.style 2 args={% shortens for (my) edge label
    edge label={node[midway, font=\footnotesize, #1]{#2}},
                    },
        }% end of forestset
\centering
\begin{forest}
  for tree={circle, draw,
            minimum size=2em, % <-- added
            inner sep=1pt}      % <-- added
[,Circle
    [, Circle, EL={left}{0}
      [$S^e_0$, EL={left}{0} ]
      [$S^e_1$, EL={right}{1}]
    ]
    [, Circle, EL={right}{1}
      [$S^e_2$,EL={left}{0}]
      [$S^e_3$,EL={right}{1}]
  ]
]
\end{forest}

\bigskip
\begin{forest}
  for tree={circle, draw,
            minimum size=2em, % <-- added
            inner sep=1pt}      % <-- added
[,Circle
    [, Circle, EL={left}{0}
      [, Circle, EL={left}{0}, fit=band
        [$S^{e+1}_0$, EL={left}{0}]
        [$S^{e+1}_1$,  EL={right}{1}]
        ]
      [$S^{e+1}_2$, EL={right}{1} ]
    ]
    [, Circle, EL={right}{1}
      [$S^{e+1}_3$, EL={left}{0}]
      [$S^{e+1}_4$, EL={right}{1} ]
  ]
]
\end{forest}
\quad
\begin{forest}
  for tree={circle, draw,
            minimum size=2em, % <-- added
            inner sep=1pt}      % <-- added
[,Circle
    [, Circle,  EL={left}{0}, fit=band
      [$S^{e+2}_0$, EL={left}{0} ]
      [$S^{e+2}_1$, EL={right}{1} ]
    ]
    [$S^{e+2}_2$,  EL={right}{1} ]
]
\end{forest}
\caption{...}
\label{fig:...}
\end{figure}
\end{document}

在此处输入图片描述

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