我正在使用forest包来创建一棵树。但是我想打印树的每一级的深度数字（如下图中的 1 级和 2 级）。
我已经创建了树。其代码如下：
\documentclass{article}
\usepackage[utf8]{inputenc}
\title{Temp}
\author{mjain8 }
\date{May 2017}
\usepackage{forest}
\begin{document}
\begin{forest}
my edge label/.style={
edge label={node [midway,above,sloped, font=\tiny] {$#1$}}
},
for tree={%
l sep=1.5cm,
s sep=0.2cm,
minimum height=1.5cm,
minimum width=1.7cm,
align=left
},
my label/.style={
label={[anchor=south,font=\scriptsize,red]:#1},
},
max label/.style={
label={[anchor=south,font=\scriptsize]:#1},
},
level label/.style={
label={[font=\scriptsize]left:#1},
},
[A,draw,circle,my label={1},max label={maxprofit:0},level label={$i_1$}
[B,draw,circle,my edge label={\{i_1\}},my label={2},max label={maxprofit:10}
[D,draw,circle,my edge label={\{i_1,i_2\}},my label={3},max label={maxprofit:40}
[E,draw,circle,my edge label={\{i_1,i_2,i_3\}},my label={4},max label={maxprofit:80}
[F,draw,circle,my edge label={\{i_1,i_2,i_3,i_4\}},my label={5}]
[G,draw,circle,my edge label={\{i_1,i_2,i_3\}},my label={6}]
]
[H,draw,circle,my edge label={\{i_1,i_2\}},my label={7}]
]
[I,draw,circle,my edge label={\{i_1\}},my label={8}
[J5,draw,circle,my edge label={\{i_1,i_3\}},my label={9}
[K,draw,circle,my edge label={\{i_1,i_3,i_4\}},my label={10 : F as 17>16}]
[L,draw,circle,my edge label={\{i_1,i_3\}},my label={11 : B as 50<80}]
]
[M,draw,circle,my edge label={\{i_1\}},my label={9 : B as 60 < 80}]
]
]
[N,draw,circle,my edge label={\{\}},my label={12}
[O,draw,circle,my edge label={\{i_2\}},my label={13}
[P,draw,circle,my edge label={\{i_2,i_3\}},my label={14}
[Q,draw,circle,my edge label={\{i_2,i_3,i_4\}},my label={15 : F as 17>16}]
[R,draw,circle,my edge label={\{i_2,i_3\}},my label={16}]
]
[S,draw,circle,my edge label={\{i_2\}},my label={17}]
]
[T,draw,circle,my edge label={\{\}},my label={18}
[U,draw,circle,my edge label={\{i_3\}},my label={19}
[V,draw,circle,my edge label={\{i_3,i_4\}},my label={20},max label={maxprofit:90}]
]
[W,draw,circle,my edge label={\{\}},my label={21: B as 50<90}]
]
]
]
\end{forest}
\end{document}
我尝试阅读森林文档，但似乎相关文档中没有提及任何内容。
有人可以建议如何做到这一点吗？
答案1
像这样？树上已经有很多标签了，但我在左侧添加了无衬线标签，如图片所示。
\documentclass[border=10pt]{standalone}
\usepackage{forest}
\begin{document}
\begin{forest}
my edge label/.style={
edge label={node [midway,above,sloped, font=\tiny] {$#1$}}
},
for tree={%
l sep=1.5cm,
s sep=0.2cm,
minimum height=1.5cm,
minimum width=1.7cm,
align=left,
circle,
draw,
},
my label/.style={
label={[anchor=south,font=\scriptsize,red]:#1},
},
max label/.style={
label={[anchor=south,font=\scriptsize]:#1},
},
level label/.style={
label={[font=\scriptsize]left:#1},
},
before drawing tree={
tikz+={
\node [anchor=mid east, font=\sffamily] (m) at (current bounding box.west |- .mid) {Level 1};
},
tempcounta'=1,
for tree={
if={% if the current level exceeds the value of tempcounta
>OR>{level}{tempcounta}%
}{% then step the count and add the level marker
tempcounta'+=1,
tikz+/.process={ Rw {tempcounta} {
\node [anchor=mid east, font=\sffamily] at (m.east |- .mid) {Level #1};
}%
},
}{},
},
},
[A, my label={1},max label={maxprofit:0},level label={$i_1$}
[B, my edge label={\{i_1\}},my label={2},max label={maxprofit:10}
[D, my edge label={\{i_1,i_2\}},my label={3},max label={maxprofit:40}
[E, my edge label={\{i_1,i_2,i_3\}},my label={4},max label={maxprofit:80}
[F, my edge label={\{i_1,i_2,i_3,i_4\}},my label={5}]
[G, my edge label={\{i_1,i_2,i_3\}},my label={6}]
]
[H, my edge label={\{i_1,i_2\}},my label={7}]
]
[I, my edge label={\{i_1\}},my label={8}
[J5, my edge label={\{i_1,i_3\}},my label={9}
[K, my edge label={\{i_1,i_3,i_4\}},my label={10 : F as 17>16}]
[L, my edge label={\{i_1,i_3\}},my label={11 : B as 50<80}]
]
[M, my edge label={\{i_1\}},my label={9 : B as 60 < 80}]
]
]
[N, my edge label={\{\}},my label={12}
[O, my edge label={\{i_2\}},my label={13}
[P, my edge label={\{i_2,i_3\}},my label={14}
[Q, my edge label={\{i_2,i_3,i_4\}},my label={15 : F as 17>16}]
[R, my edge label={\{i_2,i_3\}},my label={16}]
]
[S, my edge label={\{i_2\}},my label={17}]
]
[T, my edge label={\{\}},my label={18}
[U, my edge label={\{i_3\}},my label={19}
[V, my edge label={\{i_3,i_4\}},my label={20},max label={maxprofit:90}]
]
[W, my edge label={\{\}},my label={21: B as 50<90}]
]
]
]
\end{forest}
\end{document}