在 tkz 中向某个方向弯曲箭头

Question

我有以下代码，可以给出附图。

\documentclass[border=4mm]{standalone}
\usepackage{tkz-berge}
\begin{document}
    \begin{tikzpicture}
    [->, >=stealth', auto, thick,
    main node/.style=
    {circle, fill=black!30, draw, minimum size=.3cm, inner sep=0pt]},
    scale=2
    ]
    \newcommand\vx{0.5}
    \newcommand\vy{.5}
    \newcommand\fx{1} % 4.x
    \node[main node] (*) at (-\vx,  0 ) {$*$};

    \node[main node] (n) at ( \vx, \vy) {$n$};
    \node[main node] (m) at (\vx, -\vy) {$m$};

    \node (x_1) at (-2*\vx,-\vy) {$x_1 $};
    \node (x_mid) at (-2*\vx,0) {$... $};
    \node (x_i) at (-2*\vx,\vy) {$x_i$};
    \node (y_1) at (4*\vx,\vy) {$y_1$};
    \node (y_mid) at (4*\vx,0) {$...$};
    \node (y_j) at (4*\vx,-\vy) {$y_j$};
    \path[-]
    (*) 
    edge node {} (m) 
    edge node {} (n) 

    ;
    \begin{scope}[every path/.style={->}]
    \draw (*) --(x_1);
    \draw (*) -- (x_mid); 
    \draw (*) -- (x_i);
    \draw (*) -- (y_1);
    \draw (*) -- (y_mid); 
    \draw (*) -- (y_j);
    \end{scope}  

    \end{tikzpicture}
\end{document}

得出：

但是我想用第二张图片中类似的东西替换右边的箭头。我需要箭头沿着类似的路径然后分开。有人能给我一些建议吗？如果我也可以像图中那样添加一个圆圈就太好了。

Answer 1

在有用的位置添加一个新节点，例如2*\vx,0，并通过该节点绘制线条：

\documentclass[border=4mm]{standalone}
\usepackage{tkz-berge}
\begin{document}
    \begin{tikzpicture}
    [->, >=stealth', auto, thick,
    main node/.style=
    {circle, fill=black!30, draw, minimum size=.3cm, inner sep=0pt]},
    scale=2
    ]
    \newcommand\vx{0.5}
    \newcommand\vy{.5}
    \newcommand\fx{1} % 4.x
    \node[main node] (*) at (-\vx,  0 ) {$*$};

    \node[main node] (n) at ( \vx, \vy) {$n$};
    \node[main node] (m) at (\vx, -\vy) {$m$};

    \node (x_1) at (-2*\vx,-\vy) {$x_1 $};
    \node (x_mid) at (-2*\vx,0) {$... $};
    \node (x_i) at (-2*\vx,\vy) {$x_i$};
    \node (y_1) at (4*\vx,\vy) {$y_1$};
    \node (y_mid) at (4*\vx,0) {$...$};
    \node (y_j) at (4*\vx,-\vy) {$y_j$};
    \node [draw,circle,minimum size=6mm] (kink) at (2*\vx,0) {}; %%% <-- added
    \path[-]
    (*) 
    edge node {} (m) 
    edge node {} (n) 

    ;
    \begin{scope}[every path/.style={->}]
    \draw (*) --(x_1);
    \draw (*) -- (x_mid); 
    \draw (*) -- (x_i);
    \draw (*) -- ([yshift=1mm]kink.center) -- (y_1); %% added middle coordinate
    \draw (*) -- (y_mid); 
    \draw (*) -- ([yshift=-1mm]kink.center) -- (y_j); %% added middle coordinate
    \end{scope}  

    \end{tikzpicture}
\end{document}