如何在 LaTeX 中绘制图形

Question

我想画一些类似的东西

在 LaTeX 中。

我是 LaTeX 新手，不知道如何绘制。我该怎么办？

Answer 1

一种可能性是使用TikZ；使用循环放置和命名一些圆形节点\foreach，然后使用以下语法绘制箭头(<name>.<angle>)：

代码：

\documentclass[tikz,border=1mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}

\tikzset{
  mycircle/.style={
  circle,
  draw,
  inner sep=5pt
  }
}

\begin{document}

\begin{tikzpicture}[>=latex]
\foreach \Valor/\Texto in {1/$7$,2/$11$,3/$18$,4/$12$}
  \node[mycircle,label={left:\Texto}] at (0,-\Valor cm) (column\Valor) {};
\foreach \Valor/\Texto in {1/$-10$,2/$-23$,3/$-15$}
  \node[mycircle,label={above:\Texto}] at (\Valor cm,1cm) (row\Valor) {};
\node[above right=5pt and 20pt of row3] {Demands};
\node[below=5pt and 20pt of column4] {Supplies};

\draw[->]
  (column1.20) -| (row1.-110) node[midway,above left] {$5$};  
\draw[->]
  (column1.-20) -| (row2.-140) node[midway,above left] {$6$};  
\draw[->]
  (column2.20) -| (row1.-70) node[midway,above left] {$8$};  
\draw[->]
  (column2.0) -| (row2.-110) node[midway,above left] {$4$};  
\draw[->]
  (column2.-20) -| (row3.-110) node[midway,above left] {$3$};  
\draw[->]
  (column3) -| (row2.-70) node[midway,above left] {$9$};  
\draw[->]
  (column4.20) -| (row2.-40) node[midway,above left] {$3$};  
\draw[->]
  (column4.-20) -| (row3.-70) node[midway,above left] {6};  

\end{tikzpicture}

\end{document}