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使用幻影节点调整节点级别

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使用幻影节点调整节点级别

考虑MWE：

\documentclass[landscape]{article}

\usepackage{tikz}
\usetikzlibrary{shapes,arrows}
\begin{document}

\tikzset{
  treenode/.style = {align=center, inner sep=2pt, rounded corners = 2pt, minimum width = 2cm, text centered, font=\sffamily},
  block/.style = {treenode, rectangle, white, font=\sffamily\bfseries, draw=black, fill=black},
  phantom/.style = {}
}

\begin{tikzpicture}[->,>=stealth',level/.style={sibling distance = 3in/#1, level distance = 1.5cm}] 
  \node [block] {P1}
    child {node [block] {P2}
      child {node [block] {P3}
        child {node [block] {P4}}
        child {node [block] {P5}}
      }
    }
    child {node [block] {P6}
      child {node [phantom] {}
        child {node [block] {P7}}
      }
    }
    child {node [block] {P8}
      child {node [block] {P9}
        child {node [block] {P10}}
      }
    }
  ;
\end{tikzpicture}

\end{document}

我正在使用幻影节点让 P7 与 P4、P5 和 P10 处于同一级别。

但是在幻影节点的位置，我得到了一些空白空间，来自 P6 的连接器终止于此，并且新的连接器从该空白空间开始到 P7。

如何获得从 P6 到 P7 的直连接器？通常，我们如何调整各个节点的“级别”？

答案1

在这种情况下，forest可能会有所帮助；tier关键是让您毫不费力地获得所需的对齐（还请注意较短的代码）：

\documentclass{article}
\usepackage{forest}

\tikzset{
treenode/.style={
  align=center, 
  inner sep=2pt, 
  rounded corners=2pt,
  minimum width = 2cm,
  font=\sffamily
  },
block/.style={
  treenode, 
  rectangle, 
  white, 
  font=\sffamily\bfseries, 
  draw=black, 
  fill=black
  },
  phantom/.style = {}
}

\begin{document}


\begin{forest}
for tree={
  block,
  edge={->,>=latex},
  where level={0}{s sep=1.5cm}{}
}
[P1
  [P2
    [P3
      [P4]
      [P5,tier=last]
    ]
  ]
  [P6,before computing xy={s=(s("!p")+s("!n"))}
    [P7,tier=last]
  ]
  [P8
    [P9]
    [P10,tier=last]
  ]
]
\end{forest}

\end{document}

在此处输入图片描述

由于节点的当前标签方案也可以留给包，因此代码可以更短。

答案2

这是一个可行的解决方案。要删除空格，请使用coordinate而不是node，这里 edge from parent/.style={draw=none}用于不绘制从 P6 到 P7 的线，然后手动绘制 (P6)--(P7) 线。

在此处输入图片描述

代码

\documentclass[border=1cm]{standalone}
%\documentclass[landscape]{article}

\usepackage{tikz}
\usetikzlibrary{shapes,arrows}
\begin{document}

\tikzset{
  treenode/.style = {align=center, inner sep=2pt, rounded corners = 2pt, minimum width = 2cm, text centered, font=\sffamily},
  block/.style = {treenode, rectangle, white, font=\sffamily\bfseries, draw=black, fill=black},
  phantom/.style = {},
}

\begin{tikzpicture}[->,>=stealth',
level/.style={sibling distance = 3in/#1, level distance = 1.5cm}
] 
  \node [block] {P1}
    child {node [block] {P2}
      child {node [block] {P3}
        child {node [block] {P4}}
        child {node [block] {P5}}
      }
    }
    child {node [block](a) {P6}
      child {coordinate [phantom,edge from parent/.style={draw=none}] {}
        child {node [block](b) {P7}}
      }
    }
    child {node [block] {P8}
      child {node [block] {P9}
        child {node [block] {P10}}
      }
    }
  ;
\draw[->] (a)--(b);
\end{tikzpicture}

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