如何在 Latex 中绘制此 DAG 依赖关系图

Question

我想知道如何在 Latex 中绘制类似的东西。请注意，边缘不是直线，就像我在许多 Tkz 示例中看到的那样。这是一个属性语法的示例，其中边缘表示属性值的流动。

\usepackage{tikz}
\usetikzlibrary{arrows}
\usetikzlibrary{positioning,calc}

\begin{document}

\begin{tikzpicture}[->,>=stealth',auto,node distance=2cm,
  thick,main node/.style={draw}]

\node[main node, rectangle, align=center] (1)                            {$n_0.S$};
\node[main node, rectangle, align=center] (2) [below= of 1]              {$n_1.I_1$};
\node[main node, rectangle, align=center] (3) [right =of 2, below= of 1] {$n_1.I_2$};
\node[main node, rectangle, align=center] (4) [right =of 3, below= of 1] {$n_1.S_1$};
\node[main node, rectangle, align=center] (5) [right =of 4, below= of 1] {$n_1.S_2$};
\node[main node, rectangle, align=center] (6) [below= of 1]              {$n_2.I_1$};
\node[main node, rectangle, align=center] (7) [right =of 6, below= of 1] {$n_2.I_2$};
\node[main node, rectangle, align=center] (8) [right =of 7, below= of 1] {$n_2.S_1$};
\node[main node, rectangle, align=center] (9) [right =of 8, below= of 1] {$n_2.S_2$};

\draw (2.south) to (4.south);
\draw (4.south) to (5.south);

\draw (6.south) to (8.south);
\draw (7.south) to (9.south);

\draw (3.south) to (6.north);
\draw (5.south) to (7.north);

\draw (8.south) to (3.north);
\draw (9.south) to (2.north);

\draw (8.north) to (1.south);

\end{tikzpicture}


\end{document}

Answer 1

这是一个例子。我使用手动定位框（它们在原始图片中以不同的方式接触，因此我认为使用positioning不是正确的工具）。我添加了一些可能的箭头来展示这个想法，您的 MWE 连接与上图不符。

我建议使用更明确的节点名称（如I1left，I2left等等），甚至可以通过一些\foreach循环简化图表，但我只是在这里做了最少的工作来展示这个想法。

\documentclass[border=2.78mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc,arrows.meta}%arrows is deprecated

\begin{document}

\begin{tikzpicture}[->,>=Stealth,auto,
  thick,main node/.style={draw, rectangle, align=center, text width=1cm}]

\node[main node, ] (1) at (0,4)    {$n_0.S$};

% stack left
\node[main node, ] (2) at (-6,0)   {$n_1.I_1$};
\node[main node, anchor=north west] (3) at(2.north east) {$n_1.I_2$};
\node[main node, anchor=south west] (4) at(3.north east) {$n_1.S_1$};
\node[main node, anchor=north west] (5) at(4.north east) {$n_1.S_2$};
% stack right
\node[main node, ] (6) at (2,0)   {$n_1.I_1$};
\node[main node, anchor=north west] (7) at(6.north east) {$n_1.I_2$};
\node[main node, anchor=south west] (8) at(7.north east) {$n_1.S_1$};
\node[main node, anchor=north west] (9) at(8.north east) {$n_1.S_2$};

\draw (2.south) to[out=-30, in=-120, looseness=1.2] (4.south);
\draw (3.south) to[out=-30, in=-120, looseness=1.2] (5.south);

\draw (6.south) to[out=-30, in=-120, looseness=1.2] (8.south);
\draw (7.south) to[out=-30, in=-120, looseness=1.2] (9.south);

\draw (3.north) to[out=30, in=120, looseness=1.2] (6.north);

\draw (8.north) to[out=90, in=-90] (1.south);

% the control points are relative to the star point here
\draw[red] (8.north) .. controls +(-1,1) and +(-5,2) .. (3.north);
\end{tikzpicture}
\end{document}