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图中标签距离线条太远

tag-icon • tag-icon tikz-pgf diagrams labels
图中标签距离线条太远

我在图表中遇到标签问题。我想让它们更靠近线条，但似乎找不到办法。有没有办法让标签更靠近线条？

以下是代码：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows}
\begin{document}
\begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto, minimum width = 3em, minimum height = 3em,
  thick, main node/.style={rectangle,fill=white,draw}
 ]

  \node[main node,node distance=3cm] (2) {I(t)};
  \node[main node,node distance=3cm] (1) [left of=2] {S(t)};
  \node[main node,node distance=3cm] (3) [right of=2] {A(t)};
  \node[below of=1,node distance=2cm] (dummy1) {};
  \node[below of=2,node distance=2cm] (dummy2) {};
  \node[below of=3,node distance=2cm] (dummy3) {};
  \node[right of=3,node distance=2cm] (dummy4) {};
  \node[left of=1,node distance=2cm] (dummy) {};


 \draw[->,draw=black] (1)  -- node {$\lambda(t)$} (2);
 \draw[->,draw=black] (2)  -- node {$\alpha$} (3);
 \draw[->,draw=black] (dummy) -- node {$\Lambda$} (1);
 \draw[->,draw=black] (1) -- node {$\mu$} (dummy1);
 \draw[->,draw=black] (2) -- node {$\mu$} (dummy2);
 \draw[->,draw=black] (3) -- node {$\mu$} (dummy3);
 \draw[->,draw=black] (3) -- node {$\nu$} (dummy4);

\end{tikzpicture}
\end{document}

在此处输入图片描述

答案1

您已设定节点大小3em在整个环境中，宽度和高度至少为s tikzpicture，而这应该只与 相关联main node/.style。我的意思是：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows}
\begin{document}
\begin{tikzpicture}[>=stealth',shorten >=1pt,auto,
  thick, main node/.style={rectangle,fill=white,draw, minimum width = 3em, minimum height = 3em}
 ]

  \node[main node,node distance=3cm] (2) {I(t)};
  \node[main node,node distance=3cm] (1) [left of=2] {S(t)};
  \node[main node,node distance=3cm] (3) [right of=2] {A(t)};
  \node[below of=1,node distance=2cm] (dummy1) {};
  \node[below of=2,node distance=2cm] (dummy2) {};
  \node[below of=3,node distance=2cm] (dummy3) {};
  \node[right of=3,node distance=2cm] (dummy4) {};
  \node[left of=1,node distance=2cm] (dummy) {};


 \draw[->,draw=black] (1)  -- node [outer ysep=0pt]{$\lambda(t)$} (2);
 \draw[->,draw=black] (2)  -- node {$\alpha$} (3);
 \draw[->,draw=black] (dummy) -- node {$\Lambda$} (1);
 \draw[->,draw=black] (1) -- node {$\mu$} (dummy1);
 \draw[->,draw=black] (2) -- node {$\mu$} (dummy2);
 \draw[->,draw=black] (3) -- node {$\mu$} (dummy3);
 \draw[->,draw=black] (3) -- node {$\nu$} (dummy4);

\end{tikzpicture}
\end{document}

预期输出：

在此处输入图片描述

答案2

如果你把这行放在两个代码块之间

\tikzset{every node/.style={draw}}

这就是你将看到的

在此处输入图片描述

您可以看到，它们内部的数学文本周围都有额外的间距。这是因为您提供的 tikzpicture 选项minimum width = 3em, minimum height = 3em适用于所有内容，除非您覆盖它们。

一个选择是像 AboAmmar 展示的那样，把它们带入mainnode风格或者使用

\tikzset{every node/.style={minimum size=0pt}}

在第一段代码之后重置选项..

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