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沒有箭頭的邊緣

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沒有箭頭的邊緣

我試著畫一條沒有箭頭的邊緣。當我這樣做時：

\begin{tikzpicture}

\draw[thick] (0, 0) node[circle, draw](A) {};
\draw[thick] (A) edge[loop below] (A);
 
\end{tikzpicture}

即使我沒有在 tikz 代碼中指定 ">=，我也會得到一個箭頭。我嘗試了“邊緣[-，下面循環]”，但仍然得到箭頭。我還嘗試了「edge[style={},loop below]」。我最終透過嘗試距離移除了箭頭：

\begin{tikzpicture}

\draw[thick] (0, 0) node[circle, draw](A) {};
\draw[thick] (A) edge[loop below, distance=1cm] (A);
 
\end{tikzpicture}

為什麼距離會關閉箭頭？我在這裡錯過了什麼嗎？

\documentclass{article}
\usepackage{tikz}
\begin{document}

\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw](A) {};
\draw[thick] (A) edge[loop below] (A);
\end{tikzpicture}

\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw](A) {};
\draw[thick] (A) edge[loop below, distance=1cm] (A);
\end{tikzpicture}

\end{document}

答案1

不是答案，但從手冊（75.4 Loops）推斷，它可能是解析邏輯（也許也與 的定義交互edge[loop]，但這是一個猜測）。

初始值為->， ，loop below其餘均不設值。請注意，這edge[distance=10pt,loop below]會產生一個箭頭提示。

環形

微量元素

\documentclass{article}
\usepackage{tikz}

\begin{document}
\center
\begin{tabular}{cc}
\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw,pin={(A) edge[in=255,out=285,min distance=5mm] (A)}](A) {1};
\draw[thick] (A) edge[in=255,out=285,min distance=5mm] (A);
\end{tikzpicture} &
\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw,pin={edge[->...}](A) {1};
\draw[thick] (A) edge[->,in=255,out=285,min distance=5mm] (A);
\end{tikzpicture}\\
\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw,pin={(A) to [loop below] ()}](A) {2};
\draw[thick] (A) to [loop below] ();
\end{tikzpicture} &
\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw,pin={\textbackslash draw[thick,->]...}](A) {2};
\draw[thick,->] (A) to [loop below] ();
\end{tikzpicture}\\
\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw,pin={(A) edge[loop below, distance=2mm] (A)}](A) {3};
\draw[thick] (A) edge[loop below, distance=2mm] (A);
\end{tikzpicture}&
\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw,pin={edge[->,...}](A) {3};
\draw[thick] (A) edge[->,loop below, distance=2mm] (A);
\end{tikzpicture}\\
\end{tabular}

\begin{tikzpicture}%[every loop/.style={}]
\draw (0,0) edge [red,loop above] () to [loop right] ()
to [loop below] () to [loop left] ();
\end{tikzpicture}
\begin{tikzpicture}[every loop/.style={}]
\draw (0,0) edge [loop above] () to [loop right] ()
to [loop below] () to [loop left] ();
\end{tikzpicture}

\begin{tikzpicture}
\node [circle,draw] {a} edge [loop above] node {x} ();
\end{tikzpicture}
\begin{tikzpicture}[every loop/.style={}]
\node [circle,draw] {a} edge [loop above] node {x} ();
\end{tikzpicture}

\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw](Z) {};
\draw[thick] (Z) edge[red,distance=10pt,loop below] (Z);
\end{tikzpicture}
\begin{tikzpicture}
\draw[thick] (0, 0) node[circle, draw](Z) {};
\draw[thick] (Z) edge[loop below,distance=10pt] (Z);
\end{tikzpicture}
\end{document}

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