当使用带有 [grow right sep] 选项的图库时，如何指定节点链之间的垂直距离？

Question

我想使用该graphs库绘制框图，到目前为止运行良好。但是，我想通过添加另一个节点链来向下面的框图添加另一个输入。正如您在下面的最小工作示例中所看到的，占位符节点链1 -> 2 -> 3;和a -> b -> c;应该更低，但我找不到任何选项来增加节点链之间的垂直距离pgfmanual.pdf。有人知道使用该选项时在图形中指定节点链之间垂直距离的选项grow right sep吗？

\documentclass{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}

\usepackage{tikz}
\usetikzlibrary{graphs,calc}

\begin{document}

\begin{tikzpicture}[
    ,sum/.style={
        ,draw
        ,circle
        ,inner sep=0pt
        ,minimum size=2mm
        ,graphs/empty nodes
    }
    ,point/.style={
        ,draw
        ,circle,
        ,inner sep=0pt
        ,minimum size=1mm
        ,fill=black
        ,graphs/empty nodes
    }
    ,block/.style={
        ,draw
        ,rectangle          % shape
        ,minimum size = 6mm % size
        ,semithick         % border
    }
    ,mblock/.style={ % block with \displaystyle
        ,block
        ,font=\everymath\expandafter{\the\everymath\displaystyle}
    }
    ,mblockfeedback/.style 2 args={to path={
            node[mblock] (b) at ($(\tikztostart)!0.5!(\tikztotarget)+(0,#1)$){#2}
            -- ++(0,#1)
            -- (b)
            -- (b -| \tikztotarget)
            -- (\tikztotarget)\tikztonodes
        }
    }
    ,minus/.style = {edge node={node[#1]{$-$}}}
    ,mblock/.append style={text height=3.25ex, text depth=2ex}
]
    \graph[grow right sep=1cm] {
            "$X(s)$"
            -> s1[sum]
            -> "$K$"[mblock]
            -> "$\frac{1}{s}$"[mblock]
            -- p1[point]
            -> "$Y(s)$";
            
            p1 ->[mblockfeedback={-1.5cm}{$\frac{1}{K}$},minus={pos=0.9,right}] s1;

            1 -> 2 -> 3;
            
            a -> b -> c;
        }
    ;
\end{tikzpicture}

\end{document}

Answer 1

使用branch down。

\documentclass{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}

\usepackage{tikz}
\usetikzlibrary{graphs,calc}

\begin{document}
    
    \begin{tikzpicture}[
        ,sum/.style={
            ,draw
            ,circle
            ,inner sep=0pt
            ,minimum size=2mm
            ,graphs/empty nodes
        }
        ,point/.style={
            ,draw
            ,circle,
            ,inner sep=0pt
            ,minimum size=1mm
            ,fill=black
            ,graphs/empty nodes
        }
        ,block/.style={
            ,draw
            ,rectangle          % shape
            ,minimum size = 6mm % size
            ,semithick         % border
        }
        ,mblock/.style={ % block with \displaystyle
            ,block
            ,font=\everymath\expandafter{\the\everymath\displaystyle}
        }
        ,mblockfeedback/.style 2 args={to path={
                node[mblock] (b) at ($(\tikztostart)!0.5!(\tikztotarget)+(0,#1)$){#2}
                -- ++(0,#1)
                -- (b)
                -- (b -| \tikztotarget)
                -- (\tikztotarget)\tikztonodes
            }
        }
        ,minus/.style = {edge node={node[#1]{$-$}}}
        ,mblock/.append style={text height=3.25ex, text depth=2ex}
        ]
        \graph[grow right sep=1cm, branch down=3cm] {
            "$X(s)$"
            -> s1[sum]
            -> "$K$"[mblock]
            -> "$\frac{1}{s}$"[mblock]
            -- p1[point]
            -> "$Y(s)$";
            
            p1 ->[mblockfeedback={-1.5cm}{$\frac{1}{K}$},minus={pos=0.9,right}] s1;
            
            1 -> 2 -> 3;
            
            a -> b -> c;
        }
        ;
    \end{tikzpicture}
    
\end{document}