在 tikzpicture 中包含箭头吗？

Question

我正在尝试在一个简单的 tikzpicture 中重新创建该图表：

我可以得到大致的形状：

\begin{center}
    \begin{tikzpicture}
        \node[inner sep=0pt,minimum size=4pt] (e) at (0,2) {$E$};
        \node[inner sep=0pt,minimum size=4pt] (a) at (2,2) {$A$};
        \node[inner sep=0pt,minimum size=4pt] (b) at (4,2) {$B$};
        \node[inner sep=0pt,minimum size=4pt] (c) at (1,0) {$C$};
        \draw[-stealth, shorten <= 3pt, shorten >= 3pt] (e) to node [above=3pt] {$i$} (a);
        \draw[-stealth, shorten <= 3pt, shorten >= 3pt] (a) to node [above=3pt] {$f$} node [below=3pt] {$g$} (b);
        \draw[-stealth, shorten <= 3pt, shorten >= 3pt] (c) to node [left=7pt] {$k$} (e);
        \draw[-stealth, shorten <= 3pt, shorten >= 3pt] (c) to node [left=7pt] {$h$} (a);
    \end{tikzpicture}
\end{center}

但是，我不知道如何获取包含箭头样式 - 我可以在 TikZ 手册中看到有一个名为的箭头尖right hook，但我不确定如何使用它；另外，我想保留隐形箭头尖。我不确定的另一件事是如何最好地制作双箭头。

我已经找到了 tikzcd 包 - 我不想使用它；它破坏了我已经编写的内容的风格（相当多）。

Answer 1

tikz一种使用和的方法arrows。

放置right hook在 之前-stealth。通过一些位置调整，您还可以放置两个平行箭头，请参阅path命令。

输出：

代码：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows}

\begin{document}

\begin{center}
    \begin{tikzpicture}
    \node[inner sep=0pt,minimum size=4pt] (e) at (0,2) {$E$};
    \node[inner sep=0pt,minimum size=4pt] (a) at (2,2) {$A$};
    \node[inner sep=0pt,minimum size=4pt] (b) at (4,2) {$B$};
    \node[inner sep=0pt,minimum size=4pt] (c) at (1,0) {$C$};
    \draw[right hook-stealth, shorten <= 3pt, shorten >= 3pt] (e) to node [above=3pt] {$i$} (a);
    \path[-stealth, shorten <= 3pt, shorten >= 3pt]
    ([yshift=-2pt]a.east) edge node [above,yshift= 1.0ex]  {$f$} ([yshift=-2pt]b.west)
    ([yshift= 2pt]a.east) edge node [below,yshift=-1.0ex]  {$g$} ([yshift= 2pt]b.west);
    \draw[-stealth, shorten <= 3pt, shorten >= 3pt, dashed] (c) to node [left=7pt] {$k$} (e);
    \draw[-stealth, shorten <= 3pt, shorten >= 3pt] (c) to node [left=7pt] {$h$} (a);
    \end{tikzpicture}
\end{center}

\end{document}

Answer 2

和tikz-cd。

\documentclass{article}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}[column sep=1em,row sep=2em]
 E \arrow[rr,hook,"i"] && A \arrow[rr,yshift=2pt,"f"] \arrow[rr,yshift=-2pt,"g"
 '] & ~ &B\\
 & C\arrow[ul,dashed,"h"] \arrow[ur,"k"] & &&
\end{tikzcd}
\end{document}

Answer 3

另一种可能的方法是直接用 Ti 绘制钩箭头钾z 使用arc。对于双箭头，使用节点锚点。

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{center}
    \begin{tikzpicture}
        \node[inner sep=0pt,minimum size=4pt] (e) at (0,2) {$E$};
        \node[inner sep=0pt,minimum size=4pt] (a) at (2,2) {$A$};
        \node[inner sep=0pt,minimum size=4pt] (b) at (4,2) {$B$};
        \node[inner sep=0pt,minimum size=4pt] (c) at (1,0) {$C$};
        \draw[-stealth] ([xshift=2ex,yshift=1ex] e) arc (90:270:0.5ex)--(a)node[midway, above]{$i$};
%        \draw[-stealth, shorten <= 3pt, shorten >= 3pt] (a) to node [above=3pt] {$f$} node [below=3pt] {$g$} (b);
        \draw[dashed,-stealth, shorten <= 3pt, shorten >= 3pt] (c) to node [left=7pt] {$k$} (e);
        \draw[-stealth, shorten <= 3pt, shorten >= 3pt] (c) to node [left=7pt] {$h$} (a);

        \draw[-stealth] (a.north east)--(b.north west)node[midway, above]{$f$};
        \draw[-stealth] (a.south east)--(b.south west)node[midway, below]{$g$};
\end{tikzpicture}

\end{center}
\end{document}