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彩色上三角矩阵

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彩色上三角矩阵

我拿了一个代码并修改了它。但是，我无法正确更改它。输出是顶部矩阵，而所需的矩阵在下面（绿色上三角）。如何才能正确完成？

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{matrix,fit}
\begin{document}
\pgfdeclarelayer{background}
\pgfsetlayers{background,main}
‎
‎‎\begin{tikzpicture}[baseline={([yshift=-1ex]current bounding box.center)}]
    \matrix[matrix of math nodes,left delimiter={[},right delimiter={]},row sep=10pt,column sep=10pt] (m) {
       1  &3 &-8‎ & 5‎\\
       2  &0 &1‎& 7‎\\
       7 &9 &1‎& 2‎\\‎
       7 &9 &1‎& 2‎\\‎‎
    };
    \begin{pgfonlayer}{background}
 \node[inner sep=3pt,fit=(m-1-1)]          (1)   {};
 \node[inner sep=3pt,‎fit=(m-1-2)‎ (m-2-3‎) ‎(m-‎3‎-‎4‎‎)‎]  (2)   {};
 \node[inner sep=3pt,fit=‎‎(m-‎4‎-‎4‎)]          (3)   {‎‎};
 \draw[rounded corners,dotted,fill=green!‎8‎0!white,inner sep=3pt,fill opacity=0.1] (1.north west) ‎-‎- (2.north east) |- (3.south west) |- (2.south west) |- (1.south west) -- cycle;
\end{‎pgfonlayer}‎
  \end{tikzpicture}‎‎
\end{document}

在此处输入图片描述

答案1

我不知道为什么我无法编译你的代码，在我看来，它里面有一些罕见的字符（inputtenc Error: Unicode character ...），但是我使用另一个框架。

这里有 MWE 的三个例子：绿色表示使用矩阵中定义的节点；红色表示根据您发送的代码，您可以在其中看到错误；蓝色表示如何通过您发送的代码方法获得您想要的东西......

结果： 在此处输入图片描述 梅威瑟：

\documentclass[tikz,border=14pt]{standalone}
\usepackage{tikz}  
\usetikzlibrary{matrix,shapes,decorations.pathreplacing,fit,backgrounds}

\begin{document}
    \begin{tikzpicture}[
        %Styles
        Matrix/.style={
            matrix of nodes,
            text height=2.5ex,
            text depth=0.75ex,
            text width=3.25ex,
            align=center,
            left delimiter={[},
            right delimiter={]},
            column sep=0pt,
            row sep=0pt,
            %nodes={draw=black!10}, % Uncoment to see the square nodes.
            nodes in empty cells,
        },
        DA/.style={
            fill=green!10,
            dotted,
            line width=0.7pt,
            rounded corners=5pt,
        }
    ]

    \matrix[Matrix] at (0,0) (M){ % Matrix contents  
    1 & 3 & -8 & 5 \\
    2 & 0 & 1 & 7 \\
    7 & 9 & 1 & 2 \\
    7 & 9 & 1 & 2 \\
    };

    \matrix[Matrix,nodes={draw=black!10}] at (4,0) (M1){ % Matrix contents  
    1 & 3 & -8 & 5 \\
    2 & 0 & 1 & 7 \\
    7 & 9 & 1 & 2 \\
    7 & 9 & 1 & 2 \\
    };
     \matrix[Matrix] at (8,0) (M2){ % Matrix contents  
    1 & 3 & -8 & 5 \\
    2 & 0 & 1 & 7 \\
    7 & 9 & 1 & 2 \\
    7 & 9 & 1 & 2 \\
    };
    \begin{scope}[on background layer] %Allows to draw in background layer.
        %FOR MATRIX M
        %To delimit area groups using matrix nodes
        \draw[DA](M-1-1.north west) 
            -| (M-4-4.south east)
            -- (M-4-4.south west)
            |- (M-3-3.south west)
            |- (M-2-2.south west)
            |- (M-1-1.south west)
            -- cycle;

        % Method for your example
        % In red some mistakes
        % Fit creates squared nodes
        %\node[styles](ID){Text};
        \node[inner sep=2pt,draw,red,fit=(M1-1-1)](fit1){};
        \node[inner sep=2pt,draw,red,fit=(M1-1-2)(M1-2-3)(M1-3-4)](fit2){};
        \node[inner sep=2pt,draw,red,fit=(M1-4-4)](fit3){};
        %If you trace the draw:
        \draw[DA,fill=red,fill opacity=0.2](fit1.north west)
            -- (fit2.north east)
            |- (fit3.south west)
            |- (fit2.south west)
            |- (fit1.south west)
            -- cycle;

    % Correcting using the method you use 
    \node[inner sep=2pt,draw,blue,fit=(M2-1-1)](n1){};
    \node[inner sep=2pt,draw,blue,fit=(M2-2-2)](n2){};
    \node[inner sep=2pt,draw,blue,fit=(M2-3-3)](n3){};  
    \node[inner sep=2pt,draw,blue,fit=(M2-4-4)](n4){};
    %If you trace the draw:
        \draw[DA,fill=blue,fill opacity=0.2](n1.north west)
            -| (n4.south east)
            |- (n4.south west)
            |- (n3.south west)
            |- (n2.south west)
            |- (n1.south west)
            -- cycle;           
    \end{scope}

    \end{tikzpicture}
\end{document}

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