让图片像链条一样运作

Question

以下是使用开始于固定 TiKZ 图片。在找出这个答案的过程中，我发现了必要代码的一部分中有一个错误，我已经在 tikzmark 版本中修复了该错误github（发布日期为 2023 年 12 月，如果在该日期之后几个月阅读此内容，那么它现在几乎肯定已经在 CTAN 上更新了）。

键surround pic在与图片同名的图片周围放置一个矩形节点，以便(<pic name>.south)在定义了图片后可以使用它来定义坐标，例如。

然后，密钥pic anchor会安装代码来移动图片，以便其“锚点”位于指定位置。使用定位库，这意味着below=0pt of <previous pic>可以使用诸如之类的东西来指定此图片的位置。

最后，在弄清楚您当前的代码的作用后，我做了一些外观上的改变，主要是对已经存在的东西进行 TikZ-ify，例如使用键来加粗和居中数字，而不是对其进行硬编码。

\documentclass{article}
%\url{https://tex.stackexchange.com/q/705474/86}
\usepackage{fontspec,tikz}

\usetikzlibrary{
  calc,
  positioning,
  shapes.multipart,
  fit,
  backgrounds,
  tikzmark
}

\newcounter{stepnum}
\newcounter{tmpnum}
\newlength{\recwd}

\setlength{\recwd}{2.5in}

%% |=====8><-----| %%

\tikzset{
  pics/hvmpnode/.style n args={3}{% The basic mechanism: #1=L; #2=UR; #3=LR
    code={%
      \node[
        name=L\thestepnum,
        rounded corners=1.5pt,
        fill=cyan!20,
        text width=1.25em,
        node font=\bfseries,
        align=center,
        node contents={#1}
      ];
      \node[rounded corners,
        rectangle split,
        rectangle split parts=2,
        rectangle split part fill={yellow!80!orange!20,none},
        align=center,
        rounded corners=1.5pt,
        name=R,
        right= 0pt of L\thestepnum.east] {%
        \nodepart{one}\parbox{\recwd}{\centering\strut#2\strut}% UR
        \nodepart{two}\parbox{\recwd}{\parskip1ex\strut#3\strut}
      };% LR
      \draw[thick]  (R.text split east) -- (R.text split west);
      \node[inner sep=0pt,
        draw,
        thick,
        rounded corners=1.5pt,
        name=W\thestepnum,
        anchor=south west,
        fit=(L\thestepnum)(R)] {};% W = enclosing box
      \draw[thick] (W\thestepnum.south west -| R.west) --
      (W\thestepnum.north west -| R.west);% L/R rule
      \begin{scope}[on background layer]
      \fill[cyan!20,rounded corners=1.5pt] (W\thestepnum.north west) rectangle (R.south west);
      \end{scope}
    }%
  }
}

\NewDocumentEnvironment{example}{s O{} m o}{%
  \setcounter{stepnum}{0}%
  \parbox{\textwidth}{%
    \begingroup
    \bfseries
    \itshape
    \Large
    #3
    \par
    \endgroup
    \IfNoValueF{#4}{%
      \par\small\itshape\rightskip=0.5\textwidth plus 3em#4\par
    }%
  }%
  \par
  \medskip
  \begin{tikzpicture}[]
}{%
  \end{tikzpicture}
  \bigskip
}

\tikzset{
  if number/.code n args={3}{
    \ifnum#1\relax
    \pgfkeysalso{#2}
    \else
    \pgfkeysalso{#3}
    \fi
  }
}

\NewDocumentCommand{\step}{O{24pt} m +m}{% #1=materials; #2=technique
  \stepcounter{stepnum}%
  \setcounter{tmpnum}{\numexpr\thestepnum-1\relax}
  \pic[
    name=hvmp\thestepnum,
    surround pic,
    if number={\thestepnum=1}{}{
      pic anchor, 
      below=0pt of hvmp\thetmpnum,
    }
  ] {hvmpnode={\thestepnum}{#2}{#3}};
}

%% |=====8><-----| %%

\parindent0pt

\begin{document}

\thispagestyle{empty}

\begin{example}{Foobar}[This is a meaningless bunch of bla bla bla to see if this works in any way, shape, or form.]
\step{1 2 3 4 5 6}{bla bla bla lkfjdlkj}
\step[49.66pt]{z b c d e f 7 8 9}{Much more bla bla bla and this is so much more jejune nonsense and a lot more bubbishy stuff that makes no sense. Much more bla bla bla and this is so much more jejune nonsense and a lot more bubbishy stuff that makes no sense.}
\step[49.66pt]{z b c d e f 7 8 9}{Much more bla bla bla, Much more bla bla bla and this is so much more jejune nonsense and a lot more bubbishy stuff that makes no sense. Much more bla bla bla and this is so much more jejune nonsense an}
\step[19.66pt]{z b c d e f 7 8 9}{Much more bla bla bla}
\end{example}

\end{document}

结果（经过几次编译以使坐标稳定下来）：

Answer 1