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TikZ - forest - 用于 nodewalk 添加从根到叶的路径

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TikZ - forest - 用于 nodewalk 添加从根到叶的路径

在接下来的M(erly)WE中，这是我的目标。

  1. 我想以颜色作为论据。
  2. 我想装饰从根到叶子的所有边和节点。

以下是代码的输出。

在此处输入图片描述

我正在尝试使用for nodewalk但不知道如何使用...

  • ...将节点定义为参数或使用样式，
  • ...将颜色定义为参数，
  • ... 在每个节点周围放一个框架，
  • ... 为彩色边缘提供良好的左点。

以下是部分代码。

\documentclass[12pt,a4paper]{article}

\usepackage{forest}

\begin{document}

\section{Mark all nodes}

\begin{forest}
  for tree = {
    grow'  = 0,
    l      = 2.5cm,
    parent anchor=east,
    s sep  = 1.2cm,
  },
  mark/.style = {
    mark node,edge=mark line
  },
  mark node/.style = {
    draw = red,
    line width = 2pt,
    rounded corners
  },
  /tikz/mark line/.style={
    red,
    line width = 2.5pt,
    line cap = round,
    shorten >= -1pt, % this (TikZ) key deals with "links" between edges and nodes
  },
  [
    [A, mark=red
      [B]
      [C,mark=blue]
    ]
    [D, mark=red
      [E, mark=red
        [F]
        [G, mark=red]
        [H]
      ]
    ]
  ]
\end{forest}


\section{Try to indicate only the leaf}

\begin{forest}
  for tree = {
    grow'  = 0,
    l      = 2.5cm,
    parent anchor=east,
    s sep  = 1.2cm,
  },
  before typesetting nodes={
    for nodewalk={
      c,
      every step={
        tikz/.wrap pgfmath arg={
          \draw[red,
                line width = 2.5pt,
                line cap = round] ()--(#1);
      }{name("!b")}
    },
    211,ancestors
    }{}
  },
  [
    [A,
      [B]
      [C]
    ]
    [D
      [E
        [F]
        [G]
        [H]
      ]
    ]
  ]
\end{forest}

\end{document}

答案1

我不完全确定你想做什么。（你是想为了智力练习还是出于某些实际原因而使用 nodewalk？例如，也许你想在序言中指定叶子，而不是在叶子中指定为参数。如果是这样，下面的方法虽然可以调整，但不能立即使用。

\documentclass{article}
\usepackage{forest}

\begin{document}

\section{Mark all nodes}
\tikzset{
  mark line/.style={
    #1,
    line width = 2.5pt,
    line cap = round,
    shorten >= -1pt, % this (TikZ) key deals with "links" between edges and nodes
  },
}
\forestset{
  mark/.style = {
    mark node=#1,edge={mark line=#1}
  },
  mark node/.style = {
    draw = #1,
    line width = 2pt,
    rounded corners
  },
}
\begin{forest}
  for tree = {
    grow'  = 0,
    l'      = 2.5cm,
    parent anchor=east,
    s sep'  = 1.2cm,
  },
  [
    [A, mark=red
      [B]
      [C,mark=blue]
    ]
    [D, mark=red
      [E, mark=red
        [F]
        [G, mark=red]
        [H]
      ]
    ]
  ]
\end{forest}


\section{Try to indicate only the leaf}

\forestset{%
  mark me/.style={%
    for nodewalk={while nodewalk valid={parent}{current,fake=parent}}{mark=#1}
  },
}

\begin{forest}
  for tree = {
    grow'  = 0,
    l'      = 2.5cm,
    parent anchor=east,
    s sep'  = 1.2cm,
  },
  [
    [A,
      [B]
      [C]
    ]
    [D
      [E
        [F, mark me=green]
        [G]
        [H]
      ]
    ]
  ]
\end{forest}

\end{document}

两棵树，一棵是从问题中修改而来的

答案2

我不知道我是否正确理解了你的问题...仅使用tikz，我建议以下解决方案。节点和边缘有两种样式：snode简单、cnode彩色...

在此处输入图片描述

\documentclass[12pt, border=1cm]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}

\tikzset{%
  node distance=1.5cm and 0.2cm,
  snode/.style={rectangle, rounded corners},
  cnode/.style={draw, red, rectangle, rounded corners, line width=1.75pt, text=black},
  sedge/.style={black, thin},
  cedge/.style={red, line width=1.75pt}
}

\begin{tikzpicture}
  \node[inner sep=0pt, outer sep=0pt] (R) {};
  \node[snode, above right=1.5cm and 2cm of R] (A) {A};
  \node[snode, below right=1.5cm and 2cm of R] (D) {D};
  \node[snode, above right=1cm and 2cm of A] (B) {B};
  \node[snode, below right=1cm and 2cm of A] (C) {C};
  \node[snode, right=2cm of D] (E) {E};
  \node[snode, above right=1.3cm and 2cm of E] (F) {F};
  \node[snode, right=2cm of E] (G) {G};
  \node[snode, below right=1.3cm and 2cm of E] (H) {H};

  \path
  (R) edge[sedge] (A) (A.east) edge[sedge] (B)
  (R) edge[sedge] (A) (A.east) edge[sedge] (C)
  (R) edge[sedge] (D) (D.east) edge[sedge] (E) (E.east) edge[sedge] (F) 
  (R) edge[sedge] (D) (D.east) edge[sedge] (E) (E.east) edge[sedge] (G) 
  (R) edge[sedge] (D) (D.east) edge[sedge] (E) (E.east) edge[sedge] (H); 
\end{tikzpicture}
\qquad
\begin{tikzpicture}
  \node[inner sep=0pt, outer sep=0pt] (R) {};
  \node[snode, above right=1.5cm and 2cm of R] (A) {A};
  \node[cnode, below right=1.5cm and 2cm of R] (D) {D};
  \node[snode, above right=1cm and 2cm of A] (B) {B};
  \node[snode, below right=1cm and 2cm of A] (C) {C};
  \node[cnode, right=2cm of D] (E) {E};
  \node[cnode, above right=1.3cm and 2cm of E] (F) {F};
  \node[snode, right=2cm of E] (G) {G};
  \node[snode, below right=1.3cm and 2cm of E] (H) {H};

  \path
  (R) edge[sedge] (A) (A.east) edge[sedge] (B)
  (R) edge[sedge] (A) (A.east) edge[sedge] (C)
  (R) edge[sedge] (D) (D.east) edge[sedge] (E) (E.east) edge[sedge] (G) 
  (R) edge[sedge] (D) (D.east) edge[sedge] (E) (E.east) edge[sedge] (H)
  (R) edge[cedge] (D) (D.east) edge[cedge] (E) (E.east) edge[cedge] (F); 
\end{tikzpicture}

\end{document}

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