TikZ：绘制属性语法的依赖图

Question

这是先前这个问题。我取得了一些进展，但还没有完成。我在此基础上继续努力这个答案

我目前拥有的：

我希望它是：

1. 这两条线平行吗？
2. 在中间添加两个箭头
3. 在蓝色箭头下方添加问号

    \documentclass{article}
    
    \usepackage{tikz}
    \usetikzlibrary{arrows.meta,
                    calc, chains, 
                    positioning}
                    
    \usetikzlibrary{ext.paths.ortho}
    \usetikzlibrary{ext.node-families}
    \usetikzlibrary{arrows.meta,
                    decorations.markings,
                    positioning
                    }
                    
    \begin{document}
    
    
    
\begin{figure}[htbp]
    \centering
    \begin{tikzpicture}
        [arr/.style={> = {Stealth}}]% replace standard arrow tip
        % ~~~ coordinates for the triangles ~~~~~~~~~~
        \coordinate (A) at (0,0);
        \coordinate (B) at (5,0);
        \coordinate (C) at (1.2,2.5);
        \coordinate (D) at (3.2,2.5);
            
        \coordinate (c) at (1,1.5);
        \coordinate (a) at (-0.2,-1);
        \coordinate (b) at (2.5, -1);

        % ~~~ triangles ~~~~~~~~~
        \draw (C) -- (A) -- (B) -- (D);
        \draw (a) -- (c) -- (b);

        % ~~~ rectangles ~~~~~~~~~~
        \node [draw] (R) at (0.8,.4) {};
            \node [draw, anchor=south west] (S) at(R.north east) {};

        % ~~~ blue arrow ~~~~~~
        %     with a nicer arrow tip
        %     using nodes anchors
        %     bending the blue line

        \draw [blue, ->, arr] 
        (R.south) to [out=-90, in=-90, looseness=2.75] (S.south);

        % ~~~ red line ~~~~~~~~~~
        %     use rounded corners, radius 7mm
        %     draw a path, which runs through the rectangles

        \draw [red, ->, arr, rounded corners=7mm] 
        (1,2) -- (R) -- (0.3,-1) -- (1.7,-1) -- (S) -- ((1.2, 2);

    \end{tikzpicture}
\end{figure}

\end{document}

Answer 1

• 要使线平行，请使用极坐标(θ:r)。相对坐标也有帮助，例如\draw (A) -- ++(θ:r);。
• 中间的箭头应该作为marking装饰使用postaction=decorate
• 问号可以是相对于线定位的节点。

\documentclass{article}

\usepackage{tikz}
%\usetikzlibrary{arrows.meta,
%                calc, chains, 
%                positioning}
                
%\usetikzlibrary{ext.paths.ortho}
%\usetikzlibrary{ext.node-families}
\usetikzlibrary{arrows.meta,
                decorations.markings,
                %positioning
                }
                
\begin{document}



\begin{figure}[htbp]
\centering
\begin{tikzpicture}
    [arr/.style={> = {Stealth}}, arrmark/.style={decoration={markings, mark=at position #1 with {\arrow{>}}}, postaction=decorate}]% replace standard arrow tip
    % ~~~ coordinates for the triangles ~~~~~~~~~~
    \coordinate (A) at (0,0);
    \coordinate (B) at (5,0);
    \coordinate (C) at (60:3);
    %\coordinate (D) at (3.2,2.5);
        
    %\coordinate (c) at (1,1.5);
    \coordinate (a) at (-0.2,-1);
    %\coordinate (b) at (2.5, -1);

    % ~~~ triangles ~~~~~~~~~
    \draw (C) -- (A) -- (B) -- ++(120:3)coordinate(D);
    \draw (a) -- ++(60:3)coordinate(b) -- ++(-60:3)coordinate(c);

    % ~~~ rectangles ~~~~~~~~~~
    \node [draw] (R) at (1,.4) {};
        \node [draw, anchor=south west] (S) at(R.north east) {};

    % ~~~ blue arrow ~~~~~~
    %     with a nicer arrow tip
    %     using nodes anchors
    %     bending the blue line

    \draw [blue, ->, arr] 
    (R.south) to [out=-90, in=-90, looseness=2.75]node[below right=-3pt]{\scriptsize?} (S.south);

    % ~~~ red line ~~~~~~~~~~
    %     use rounded corners, radius 7mm
    %     draw a path, which runs through the rectangles
    
    \draw[red] (R) -- ++(80:1.2);
    \draw [red, ->, arr, rounded corners=7mm, arrmark=.15, arrmark=.6] 
    (R) -- (0.3,-1) -- (1.7,-1) -- (S) -- ++(80:1.2);

\end{tikzpicture}
\end{figure}

\end{document}