在 TikZ 图中水平居中节点

Question

我使用 tikz 绘制了这张图表：

使用以下代码：

\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows}
\begin{document}
\pagestyle{empty}

\tikzstyle{line} = [draw, -latex']
\tikzstyle{block} = [rectangle, draw, fill=blue!20, 
    text width=5em, text centered, rounded corners, minimum height=4em]


\begin{tikzpicture}[node distance = 5cm, scale=0.1]
    % Place nodes
    \node  [block](trr) {Node};
    \node  [block] (trr1) [below of=trr] {A};
    \node  [block] (trr2) [left of=trr1] {B};    
    \node  [block] (trr3) [right of=trr1] {C};      
    %\node  [block] (trr4) [right of=trr3] {D};        
    % Draw edges
    \path [line] (trr) -- (trr1);
    \path [line] (trr) -- (trr2);
    \path [line] (trr) -- (trr3);
    %\path [line] (trr) -- (trr4);
\end{tikzpicture}


\end{document}

我希望这个区块节点保持居中，并且我有 4 个元素（A，乙，C和德) 位于第二行。我该如何实现这一点？

取消注释该行

\node  [block] (trr4) [right of=trr3] {D};

和

\path [line] (trr) -- (trr4);  

结果是

Answer 1

你实际上画了一棵树..所以看看下面的代码是否给出了所需的结果：

\documentclass[border=3mm,
               tikz]{standalone}

\usepackage[latin1]{inputenc}
\usepackage{tikz}

\usetikzlibrary{arrows}

    \begin{document}
\begin{tikzpicture}[
every node/.style = {rectangle, draw, rounded corners, 
                     fill=blue!20,
                     text width=3em, minimum height=2em, 
                     align=center},
edge from parent/.style= {draw, -latex'}
                        ]
\node (trr) {Node}
    child {node (trr1) {A}}
    child {node (trr2) {B}}
    child {node (trr3) {C}}
    child {node (trr4) {D}};
\end{tikzpicture}
    \end{document}

附录：五年后我注意到，你喜欢在节点北边的子节点处放置箭头。使用forest package这个可以简单地实现：

\documentclass[border=3mm]{standalone}
\usepackage{forest}
\usetikzlibrary{arrows.meta}

\begin{document}
    \begin{forest}
for tree = {
% nodes
    draw, rounded corners, fill=blue!20,
    text width=3em, minimum height=2em, text centered,
% tree
    child anchor = north,
    edge={-Latex},
    l sep=11mm,
    s sep=1mm
            }
[Node
    [A] [B] [C] [D]
]
    \end{forest}
\end{document}