使用节点和箭头的 TikZ 图形

Question

我计划绘制以下图形。

箭头是手工画的，应该是圆形的。

我想到的是以下 MWE。

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}

\usetikzlibrary{fit,positioning,hobby}
\usetikzlibrary{decorations.text}
\usetikzlibrary{decorations.pathreplacing}

\begin{document}

    \begin{tikzpicture}
    \node (one) at (0,0)   {$68 \times 62$}; 
    \node (two) at (5,0)  {$6 \times 7$};
    \node (three) at (7,0)  {$8 \times 2$};
    \draw [->,thick,postaction={decorate,decoration={raise=1ex,text along path,text align=center,text={|\footnotesize|{distance}{}}}}] (one) to [out=45,in=135] (two);
    \draw [->,thick,postaction={decorate,decoration={raise=-1.5ex,text along path,text align=center,text={|\footnotesize|{text}{}}}}] (one) to [bend right=45] (three);
    \end{tikzpicture}  
    
\end{document}

我在绘制图中箭头时卡住了。我该如何绘制该图。你能提出一些建议吗？

Answer 1

您可以使用库width=()函数calc，inner xsep=0pt将箭头精确地定位在左节点内的数字上方或下方。这是可行的，因为所有数字的宽度都相同，大致为 1ex。

（当然，更正确的应该是，例如，意思是：从节点的左上角开始，[xshift={width("$68 \times 6$")-width("$6$")/2}.one north west]向右移动到$68 \times 6$的宽度减去 的宽度的一半。）$6$one

我稍微简化了你的代码并得出了以下结论：

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

\usetikzlibrary{calc, shapes.misc}

\begin{document}

    \begin{tikzpicture}[digits/.style={inner xsep=0pt, inner ysep=2pt}]
    
    \node[digits] (one) at (0,0) {$68 \times 62$}; 
    \node[rounded rectangle, rounded rectangle right arc=none, draw] (two) at (3,0) {$6 \times 7$};
    \node[rounded rectangle, rounded rectangle left arc=none, draw] (three) at (4.25,0) {$8 \times 2$};

    \draw[thick] ([xshift={width("$6$")-1ex/2}]one.north west) to [bend left=45] node[above] (label above) {digits equal} ([xshift={width("$68 \times 6$")-1ex/2}]one.north west);

    \draw[thick] ([xshift={width("$68$")-1ex/2}]one.south west) to [bend right=45] node[below] (label below) {sum of digits $= 10$} ([xshift={width("$68 \times 62$")-1ex/2}]one.south west);

    \draw[->, thick, shorten >=2pt] (label above) to [bend left=45] node[above] {multiply} (two);
    
    \draw[->, thick, shorten >=2pt] (label below) to [bend right=45] node[below] {multiply} (three);
    
    \end{tikzpicture}
    
\end{document}