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为什么指定节点方向时要使用双箭头？

tag-icon • tag-icon tikz-pgf
为什么指定节点方向时要使用双箭头？

在绘制节点连接的时候我比较困惑。

\usepackage{xcolor}
\definecolor{darkblue}{HTML}{1F4E79}
\definecolor{salmon}{HTML}{FF9C6B}
\tikzstyle{cell} = [rectangle, minimum width=1cm, minimum height=0.5cm,text centered, draw=black, fill=salmon]
\tikzstyle{state} = [rectangle, minimum width=1cm, minimum height=0.5cm,text centered, draw=black, fill=darkblue]
\tikzstyle{arrow} = [thick,->,>=stealth]

\begin{tikzpicture}[thick,scale=0.8, every node/.style={scale=0.8},node distance=1.5cm]
    \node (0) [state] {\textcolor{white}{feature extraction}};
    \node (1) [cell, below of=0] {invertBotConE2\_f48\_k1\_b4\_noskip};
    \node (2) [cell, below of=1] {invertBotConE2\_f16\_k3\_b4\_noskip};
    \draw [arrow] (0) -- (1);
    \draw [arrow] (1) -- (2);
    \draw  (0.east)  [arrow]  edge [out=0, in=0, out looseness=4, in looseness=4]  (2.north);
\end{tikzpicture}

0,2 是我的节点。east指定时，它会在节点 0 上创建一个箭头。如果删除，它会消失。如果我想将其0.south作为边的起点怎么办？

双头连接

答案1

使用to而不是edge。

\documentclass[tikz,border=3.14mm]{standalone}
\usepackage{xcolor}
\definecolor{darkblue}{HTML}{1F4E79}
\definecolor{salmon}{HTML}{FF9C6B}
\tikzset{cell/.style={rectangle, minimum width=1cm, minimum height=0.5cm,text
centered, draw=black, fill=salmon},
state/.style={rectangle, minimum width=1cm, minimum height=0.5cm,text
centered, draw=black, fill=darkblue},
arrow/.style={thick,->,>=stealth}}
\begin{document}
\begin{tikzpicture}[thick,scale=0.8, every node/.style={scale=0.8},node distance=1.5cm]
    \node (0) [state] {\textcolor{white}{feature extraction}};
    \node (1) [cell, below of=0] {invertBotConE2\_f48\_k1\_b4\_noskip};
    \node (2) [cell, below of=1] {invertBotConE2\_f16\_k3\_b4\_noskip};
    \draw [arrow] (0) -- (1);
    \draw [arrow] (1) -- (2);
    \draw  (0.east)  [arrow]  to[out=0, in=0, out looseness=4, in looseness=4]  (2.north);
\end{tikzpicture}
\end{document}

或者使用适当的语法edge。

\documentclass[tikz,border=3.14mm]{standalone}
\usepackage{xcolor}
\definecolor{darkblue}{HTML}{1F4E79}
\definecolor{salmon}{HTML}{FF9C6B}
\tikzset{cell/.style={rectangle, minimum width=1cm, minimum height=0.5cm,text
centered, draw=black, fill=salmon},
state/.style={rectangle, minimum width=1cm, minimum height=0.5cm,text
centered, draw=black, fill=darkblue},
arrow/.style={thick,->,>=stealth}}
\begin{document}
\begin{tikzpicture}[thick,scale=0.8, every node/.style={scale=0.8},node distance=1.5cm]
    \node (0) [state] {\textcolor{white}{feature extraction}};
    \node (1) [cell, below of=0] {invertBotConE2\_f48\_k1\_b4\_noskip};
    \node (2) [cell, below of=1] {invertBotConE2\_f16\_k3\_b4\_noskip};
    \draw [arrow] (0) -- (1);
    \draw [arrow] (1) -- (2);
    \draw  (0.east)    edge[arrow,out=0, in=0, out looseness=4, in looseness=4]  (2.north);
\end{tikzpicture}
\end{document}

在此处输入图片描述

（尝试）解释：edge插入新路径。因此，您有两条路径和两个箭头。

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