如何对该表进行图案填充（不包括圆圈区域）？

Question

我想圈出矩阵表中的元素（如何在表格单元格的顶角创建一个带有边框的小单元格？) 并对矩阵表进行填充图案处理，不包括带圆圈的数字和嵌体。我还想用红色填充需求和供应中的单元格，如图所示。请帮帮我。

请注意，图中所画的红线是近似的，在最终的解决方案中，我希望有完美倾斜的线组（45 度阴影线）。

\documentclass[tikz,border=3mm]{standalone}
\usepackage{amsmath}
\usetikzlibrary{matrix}
\begin{document}
\begin{tikzpicture}[mmat/.style={matrix of math nodes,nodes in empty cells,
    row sep=-\pgflinewidth,column sep=-\pgflinewidth,
    nodes={minimum width=5.5em,minimum height=3.5em,
        draw,anchor=center,
        text depth=0.25ex,text height=0.8em}},
    inlay/.style={label={[draw,thin,anchor=north east,minimum width=0.7cm,
    minimum height=0em,inner sep=1.4pt]north east:#1}}]
    \matrix[mmat] (mat){
    &  P & Q & R & S & \textit{Supply} \\
    A & |[inlay=10]| 300 & |[inlay=20]| 200 & |[inlay=30]| 0 & |[inlay=40]| 0 & 500 \\
    B & |[inlay=50]| 0 & |[inlay=60]| & |[inlay=70]| & |[inlay=80]| & 500 \\
    C & |[inlay=90]| 0 & |[inlay=100]| & |[inlay=110]| & |[inlay=120]| & 500 \\
    Demand & |[inlay=130]| 300 & |[inlay=140]| 200 & |[inlay=150]| 1000 & |[inlay=160]| 500 & 2000 \\
    };         
    \draw (mat-1-1.north west) -- (mat-1-1.south east);
    \draw[stealth-] ([yshift=2ex,xshift=-0.5ex]mat-1-1.east) 
    -- ++ (-2ex,0) node[left,font=\itshape]{To};
    \draw[stealth-] ([xshift=3ex,yshift=0.5ex]mat-1-1.south west) 
    -- ++ (0,2ex) node[above,font=\itshape]{From};
    \end{tikzpicture}
    \end{document}

Answer 1

您可以制作带圆圈的节点内容标签，根据矩阵中的位置命名，以便可以从外部访问它们，还可以命名嵌体。这允许您填充该区域。

\documentclass[tikz,border=3mm]{standalone}
\usepackage{amsmath}
\usetikzlibrary{calc,matrix,patterns.meta}
\begin{document}
\begin{tikzpicture}[mmat/.style={matrix of math nodes,nodes in empty cells,
    row sep=-\pgflinewidth,column sep=-\pgflinewidth,
    nodes={minimum width=5.5em,minimum height=3.5em,
        draw,anchor=center,
        text depth=0.25ex,text height=0.8em}},
    inlay/.style={label={[draw,thin,anchor=north east,minimum width=0.7cm,
    minimum height=0em,inner sep=1.4pt,fill=white,
    name=inlay-\the\pgfmatrixcurrentrow-\the\pgfmatrixcurrentcolumn]north east:#1}},
    c/.style={label={[minimum width=0em,minimum height=0em,
        anchor=center,circle,inner sep=1pt,draw=red,
    name=c-\the\pgfmatrixcurrentrow-\the\pgfmatrixcurrentcolumn]center:#1}}]
    \matrix[mmat] (mat){
    &  P & Q & R & S & \textit{Supply} \\
    A & |[c=300,inlay=10]|  & |[c=200,inlay=20]| & |[c=0,inlay=30]| & |[c=0,inlay=40]|  &   |[fill=red]|500 \\
    B & |[c=0,inlay=50]| & |[inlay=60]| & |[inlay=70]| & |[inlay=80]| & 500 \\
    C & |[c=0,inlay=90]|  & |[inlay=100]| & |[inlay=110]| & |[inlay=120]| & 500 \\
    Demand & |[inlay=130,fill=red]| 300 & |[inlay=140]| 200 & |[inlay=150]| 1000 & |[inlay=160]| 500 & 2000 \\
    };         
    \draw (mat-1-1.north west) -- (mat-1-1.south east);
    \draw[stealth-] ([yshift=2ex,xshift=-0.5ex]mat-1-1.east) 
    -- ++ (-2ex,0) node[left,font=\itshape]{To};
    \draw[stealth-] ([xshift=3ex,yshift=0.5ex]mat-1-1.south west) 
    -- ++ (0,2ex) node[above,font=\itshape]{From};
    \foreach \X/\Y in {2/2,3/2,4/2,5/2,2/3,2/4}
    {\begin{scope}
    \path[pattern={Lines[angle=45,line width=0.7pt]},pattern color=red] 
    let \p1=($(c-\Y-\X.east)-(c-\Y-\X.center)$) in
     (mat-\Y-\X.south west) |- (inlay-\Y-\X.north west)
    |- (inlay-\Y-\X.south east) |- cycle
    (c-\Y-\X.center) circle[radius=\x1];
    \end{scope}}
\end{tikzpicture}
\end{document}