带箭头的循环流程图

Question

我用

\begin{tikzpicture}[
        node distance=4ex and 0em,
        block/.style={rectangle, draw, fill=white!20, 
    text width=7.5em, text centered, rounded corners, minimum height=4em},
        line/.style={draw, -latex},
        ]

        \node [block] (1) {A};
        \node [block, below right= of 1] (2) {B};
        \node [block, below left= of 2] (3) {C};
        \node [block, above left= of 3] (4) {D};

\path [line] (1) -- (2);
\path [line] (2) -- (3);
\path [line] (3) -- (4);
\path [line] (4) -- (1);
    \end{tikzpicture}

我现在想要用箭头 (1) 到 (2)、(2) 到 (3)、(4) 到 (4) 以及 (4) 到 (1) 来代替直线。请指教。

Answer 1

通过bend left节点之间的边选项，经过一些手动调整（非常类似于@CarLaTeX 答案，+1）后，箭头几乎完美地位于穿过节点的圆圈上：

\documentclass[margin=3.141592]{standalone} 
\usepackage{tikz}
\usetikzlibrary{arrows.meta,
                positioning}

\begin{document}
    \begin{tikzpicture}[
node distance = 4ex and 0em,
 block/.style = {rectangle, draw, fill=white!20,
                 text width=6em, text centered, rounded corners, minimum height=4em},
every edge/.style = {draw=gray, -{Latex[scale=0.8]}, ultra thick, bend angle=20},
                    ]
    \node [block] (1) {A};
    \node [block, below right= of 1] (2) {B};
    \node [block, below left= of 2] (3) {C};
    \node [block, above left= of 3] (4) {D};
\path   (1.east) edge [bend left] (2) 
        (2) edge [bend left] (3.east)
        (3.west) edge [bend left] (4)
        (4) edge [bend left] (1.west);       
    \end{tikzpicture}
\end{document}

给出

Answer 2

如果我的水晶球没问题的话，我想你会想要弯曲的箭而不是直线的箭。

您可以使用以下选项进行操作bend left：

\documentclass[border=1cm]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}[
    node distance=4ex and 0em,
    block/.style={rectangle, draw, fill=white!20, 
        text width=7.5em, text centered, rounded corners, minimum height=4em},
    line/.style={draw, -latex},
    ]
    \node [block] (1) {A};
    \node [block, below right= of 1] (2) {B};
    \node [block, below left= of 2] (3) {C};
    \node [block, above left= of 3] (4) {D};
    \path [line] (1) to[bend left] (2);
    \path [line] (2) to[bend left] (3);
    \path [line] (3) to[bend left] (4);
    \path [line] (4) to[bend left] (1);
\end{tikzpicture}
\end{document}