在每个 TIKZ 矩阵节点的左上角添加附加文本

Question

我想在每个单元格的角落放置一个简单的印刷体字母（并将每个数字留在单元格的中心）以形成迷宫。

\documentclass[11pt]{report}
\usepackage{tikz}
\usetikzlibrary{matrix}

\begin{document}
\begin{tikzpicture}

\matrix[matrix of math nodes,nodes in empty cells,
nodes={minimum size=3.5em,outer sep=0pt,anchor=center,draw,loosely dashed},
row sep=-\pgflinewidth,column sep=-\pgflinewidth
] (mat) {
    -1& -2,1 & -2,3 & -2,2 & -4,7 & -5\ & -5,04 & -1,3\\
    -1,4 & -1,7 & -2,6 &  -2  & -4,5 &  -4,3 & -5,1 & -5,13 \\
    -1 & -4  & -3 &  -3,2  & -3  & -4,2 & -4,4 & -49  \\
    -2 & -1,5  & -1,1 & -3,7   &  -4 &  -4,1 & -11 & -100\\
};

\draw[thick] (mat-1-1.north west) rectangle (mat-4-8.south east); 

\draw[red,thick,dashed] plot coordinates {
(mat-1-1) (mat-2-1) (mat-2-2) (mat-1-2) (mat-1-3) (mat-2-3) (mat-3-3) (mat-3-4) 
(mat-4-4) (mat-4-6) (mat-2-6) (mat-2-5) (mat-1-5) (mat-1-7) (mat-2-7) (mat-2-8) 
(mat-4-8)  };

\end{tikzpicture}
\end{document}

Answer 1

一种可能性是重叠两个矩阵，将第二个矩阵（带有字母）相对于第一个矩阵移动。

像这样：

\documentclass[11pt]{report}
\usepackage{tikz}
\usetikzlibrary{matrix}

\begin{document}

\begin{tikzpicture}
\matrix[matrix of math nodes,nodes in empty cells,
nodes={minimum size=3.5em,outer sep=0pt,anchor=center,draw,loosely dashed},
row sep=-\pgflinewidth,column sep=-\pgflinewidth
] (mat) {
    -1& -2,1 & -2,3 & -2,2 & -4,7 & -5\ & -5,04 & -1,3\\
    -1,4 & -1,7 & -2,6 &  -2  & -4,5 &  -4,3 & -5,1 & -5,13 \\
    -1 & -4  & -3 &  -3,2  & -3  & -4,2 & -4,4 & -49  \\
    -2 & -1,5  & -1,1 & -3,7   &  -4 &  -4,1 & -11 & -100\\
};

\draw[thick] (mat-1-1.north west) rectangle (mat-4-8.south east); 

\draw[red,thick,dashed] plot coordinates {
(mat-1-1) (mat-2-1) (mat-2-2) (mat-1-2) (mat-1-3) (mat-2-3) (mat-3-3) (mat-3-4) 
(mat-4-4) (mat-4-6) (mat-2-6) (mat-2-5) (mat-1-5) (mat-1-7) (mat-2-7) (mat-2-8) 
(mat-4-8)  };

% this is for centering:
\useasboundingbox (mat-1-1.north west) rectangle (mat-4-8.south east); 

\matrix[matrix of nodes,blue,
nodes={minimum size=3.5em,outer sep=0pt,anchor=center},
] (mat2) at ([shift={(-0.5,0.4)}]mat) {% <-- change the shift if you need to
    H & B & C & D & E & F & G & H\\
    A & B & C & D & E & F & G & H\\
    A & B & C & D & E & F & G & H\\
    A & B & C & D & E & F & G & H\\
};
\end{tikzpicture}

\end{document}

Answer 2

还有[label={...}]机制。标签的位置相对于中心（线与边缘相交的地方）而不是相对于角，因此有助于固定父节点的纵横比。

\documentclass{standalone}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}[label position=139, 
  every label/.style={green, below right, inner sep=1pt}]
\node[draw, inner sep=1em, label=A] at (0,0) {1,1};
\end{tikzpicture}
\end{document}