使用这些规格创建 Tikz 图片

Question

你好，我正在尝试创建一个如图所示的 tikz 图形。这是我的代码

\documentclass[border=4mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,positioning}
\begin{document}
    \begin{tikzpicture}[
  \node[rectangle] (a1) {box 1};
     \node[rectangle,below right=of a1] (a2) {box 2};
    \node[rectangle,above right=of a1] (a3) {box 3};

    \foreach \i/\j/\txt/\p in {% start node/end node/text/position
      a1/a2/1-2/below,
      a1/a3/1-3/above,
      a2/a3/2-3/below} \draw [myarrow] (\i) -- node[sloped,font=\small,\p] {\txt} (\j);
    \end{tikzpicture}
\end{document}

我不知道如何添加矩形；如何将箭头连接到侧边；以及如何在框长度不同的情况下使箭头变直——最好箭头接触边缘的中心。

Answer 1

使用Tikz shapes库并描述节点的侧面。

\documentclass[margin=4mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,positioning,shapes}
\begin{document}

 \begin{tikzpicture}[>=latex]
 \tikzstyle{rect}=[ thick, draw=blue, rectangle, minimum width=100pt, 
  minimum height = 50pt, align=center]
  \node[rect] (a1) {box 1};
  \node[rect,below right=of a1] (a3) {box 3};
  \node[rect,above right=of a1] (a2) {box 2};
\draw[->] (a1.north)--(a2.west)node[midway,above,xshift=-2mm]{1-2};
\draw[->] (a1.south)--(a3.west)node[midway,below,xshift=-2mm]{1-3};
\draw[->] (a2.south)--(a3.north)node[midway,xshift=-3mm]{2-3};

    \end{tikzpicture}
\end{document}