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如何使节点变为红色？

tag-icon • tag-icon tikz-pgf graphics
如何使节点变为红色？ 
\documentclass{article}

\usepackage{tikz,tkz-graph,tkz-berge}
\usetikzlibrary{arrows, automata}

\begin{document}

\begin{tikzpicture}[
        > = stealth, % arrow head style
        shorten > = 1pt, % don't touch arrow head to node
        auto,
        node distance = 3cm, % distance between nodes
        semithick % line style
    ]

\tikzstyle{every state}=[
        draw = black,
        thick,
        fill = white,
        minimum size = 4mm
    ]

    \node[state] (5)  {5};
    \node[state] (2) [right of=5] {2};
    \node[state] (4) [below left of=2] {4};
    \node[state] (3) [below right of=4] {3};
    \node[state] (6) [left of=3] {6};
    \node[state] (1) [above right of=3] {1};

    \path[->] (2) edge node {5} (5);
    \path[->] (5) edge node {15} (4);
    \path[->] (6) edge node {10} (5);
    \path[->] (6) edge node {4} (4);
    \path[->] (2) edge node {30} (6);
    \path[->] (3) edge node {15} (6);
    \path[->] (3) edge node {4} (2);
    \path[->] (2) edge node {20} (1.west);
    \path[->] (1) edge node {2} (2.east);
    \path[->] (1) edge node {15} (3);
    \end{tikzpicture}

\end{document}

我只想要一个节点 5 为红色，怎么做？

在此处输入图片描述

答案1

例如，您可以使用代码

\tikzstyle{red state}=[
        draw = red,
        thick,
        fill = white,
        minimum size = 4mm,
        circle
    ]

    \node[red state] (5)  {5};

使用以下 MWE

\documentclass{article}

\usepackage{tikz,tkz-graph,tkz-berge}
\usetikzlibrary{arrows, automata}

\begin{document}

\begin{tikzpicture}[
        > = stealth, % arrow head style
        shorten > = 1pt, % don't touch arrow head to node
        auto,
        node distance = 3cm, % distance between nodes
        semithick % line style
    ]

\tikzstyle{every state}=[
        draw = black,
        thick,
        fill = white,
        minimum size = 4mm
    ]

\tikzstyle{red state}=[
        draw = red,
        thick,
        fill = white,
        minimum size = 4mm,
        circle
    ]

    \node[red state] (5)  {5};
    \node[state] (2) [right of=5] {2};
    \node[state] (4) [below left of=2] {4};
    \node[state] (3) [below right of=4] {3};
    \node[state] (6) [left of=3] {6};
    \node[state] (1) [above right of=3] {1};

    \path[->] (2) edge node {5} (5);
    \path[->] (5) edge node {15} (4);
    \path[->] (6) edge node {10} (5);
    \path[->] (6) edge node {4} (4);
    \path[->] (2) edge node {30} (6);
    \path[->] (3) edge node {15} (6);
    \path[->] (3) edge node {4} (2);
    \path[->] (2) edge node {20} (1.west);
    \path[->] (1) edge node {2} (2.east);
    \path[->] (1) edge node {15} (3);
    \end{tikzpicture}

\end{document}

得到结果：

在此处输入图片描述

答案2

您可以添加样式，

  • 排队：\node[state, draw = red] (5) {5};
  • 或者在定义中：\tikzstyle{red state} = [ state, draw = red ]

如果你从头定义每种风格，比如另一个解决方案

\tikzstyle{red state} = [
        draw = red,
        thick,
        fill = white,
        minimum size = 4mm,
        circle
    ]

那么如果您想改变基本样式，就必须调整所有这些样式。

我宁愿定义

  • 基本节点样式
  • 基本节点样式的彩色版本[base, draw = ...]
  • 另一个强调基节点样式的版本，例如通过[base, fill = ...]
  • ...

所以我可以轻松更改基本节点样式，并且所有派生样式都会立即继承这一更改。

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