树中节点链接的奇怪问题

Question

我有以下树：

\documentclass[10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[top=1in, bottom=1in, left=1in, right=1in]{geometry}
\usepackage{tikz}
\usetikzlibrary{graphdrawing,graphdrawing.trees}
\usetikzlibrary{positioning,calc}
\usetikzlibrary{shapes}
\geometry{a4paper}
\title{}
\author{}
\begin{document}
\tikzset{
  treenode/.style         = {shape=rectangle, rounded corners, top color=blue!15, bottom color=blue!5, draw, align=center},
  code/.style             = {treenode, text width=1.5cm, font=\tiny},
  root/.style             = {code, top color=blue!45, bottom color=blue!15},
  qnode/.style            = {treenode}
}
\begin{tikzpicture}[tree layout, level distance=1.5cm]
\begin{scope}
  \node (root) [root] {Root}
    child { node (1) [qnode] {}
      child { node (11) {} }
      child { node (12) [qnode] {} }
      child { node (13) {} }
      child { node (14) [qnode] {} }
    }
    child { node (2) [qnode] {} }
    child { node (3) [qnode] {}
      child { node (31) [qnode] {} }
      child { node (32) [qnode] {} }
      child { node (33) [qnode] {} }
      child { node (34) [qnode] {}
        child { node (341) [qnode] {} }
        child { node (342) {} }
        child { node (343) {} }
        child { node (344) [qnode] {} }
      }
    }
    child { node (4) {} }
  ;
  \draw[->, dashed] (344) -- (334);
\end{scope}
\end{tikzpicture}
\end{document}

然而，当我用 LuaLaTeX 排版时，我得到了

No shape named 12 is known

无论我将第二种形状改为何值（在此示例中为“12”），我都会发现第二种形状是未知的。

我做错了什么？或者较少的最好：我还能如何在 2 节点和 12 节点之间画一个箭头

Answer 1

这是比答案更详细的评论。我不知道你为什么以相对复杂的方式设计简单的树。将你的（非）MWE 简化为：

\documentclass[10pt]{article}
    \usepackage[utf8]{inputenc}
    \usepackage[margin=1in, a4paper]{geometry}
    \usepackage{tikz}
    \usetikzlibrary{graphdrawing,graphdrawing.trees}% it is not necessary for your tree
    \usetikzlibrary{calc,positioning,shapes}
\title{Complex Equation Solver and Locus Plotter}
\author{Oliver Webb}
\begin{document}
\tikzset{
    treenode/.style = {shape=rectangle, rounded corners, 
                       top color=blue!15, bottom color=blue!5, draw, align=center},
    code/.style     = {treenode, text width=1.5cm, font=\tiny},
    root/.style     = {code, top color=blue!45, bottom color=blue!15},
    qnode/.style    = {treenode}
}

\begin{tikzpicture}[
%    tree layout, this cause your problem
    level distance=1.5cm,
level 1/.style={sibling distance=2cm},% added for preventing overlap of nodes
level 2/.style={sibling distance=1cm}% added for preventing overlap of node
                     ]
  \node (root) [root] {Root}
    child { node (n1) [qnode] {}
      child { node (11) {} }
      child { node (12) [qnode] {} }
      child { node (13) {} }
      child { node (14) [qnode] {} }
    }
    child { node (2) [qnode] {} }
    child { node (3) [qnode] {}
      child { node (31) [qnode] {} }
      child { node (32) [qnode] {} }
      child { node (33) [qnode] {} }
      child { node (34) [qnode] {}
        child { node (341) [qnode] {} }
        child { node (342) {} }
        child { node (343) {} }
        child { node (344) [qnode] {} }
      }
    }
    child { node (4) {} }
  ;
  \draw[->, dashed] (342) -- (343);% here is select one of existing nodes
\end{tikzpicture}
\end{document}

在 LuaLatEX 中工作（包含在最新版本的 MikTeX 中）：

如果上面的 MWE 对你不起作用，那么使用 LuaLaTeX 应该会有所不同。不幸的是，我不使用它，所以在这方面我无法帮助你。