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如何在 tikz 中定义边缘

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如何在 tikz 中定义边缘

当我对边缘使用绝对位置时，我得到的箭头几乎相交。这是我的代码。请帮忙。

\begin{tikzpicture} [
      node distance = 2cm and 0.8cm,
      >=stealth,
      scale=0.8,
      transform shape
    ]
    \node[block] at (2,3) (Incompetent Reflux Mechanism){Incompetent Lower esophageal sphincter};
    \node[block] at (2,0) (Gastric content into esophagus and beyond){Gastric content into esophagus and beyond};
    \node[block] at (-2, -3) (Symptoms){Symptoms};
    \node[block] at (6, -3)(Mucosal damage){Mucosal damage};
    \node at (2,-3){and or};
    \begin{scope}[cyan!40!black]
    \draw[->] (2,3) -- (2,0);
    \draw[->] (2,0) -- (-2,-3);
    \draw[->] (2,0) -- (6,-3);
    \end{scope}
    \end{tikzpicture}   
    \end{frame}

答案1

一般来说，nodes 的写法如下：

\node[<options>] at (<x>,<y>) (<label>) {<content>};

您已经label绘制了节点，但这些标签太长了。把它们缩短：(Mechanism)而不是(Incompetent Reflux Mechanism)现在您可以借助这些标签绘制箭头：

\draw[->] (Mechanism) -- (Gastric);

Mechanism将在标有和 的节点之间绘制一个箭头Gastric。

完整代码：

\documentclass[tikz,border=10pt]{standalone}
\tikzset{block/.style ={rectangle,draw}
}
\begin{document}
\begin{tikzpicture} [
      node distance = 2cm and 0.8cm,
      >=stealth,
      scale=0.8,
      transform shape
    ]
    \node[block] at (2,3)  (Mechanism){Incompetent Lower esophageal sphincter};
    \node[block] at (2,0)  (Gastric){Gastric content into esophagus and beyond};
    \node[block] at (-2, -3) (Symptoms){Symptoms};
    \node[block] at (6, -3) (Mucosal){Mucosal damage};
    \node at (2,-3){and or};
    \begin{scope}[cyan!40!black]
    \draw[->] (Mechanism) -- (Gastric);
    \draw[->] (Gastric.south) -- (Symptoms.north);
    \draw[->] (Gastric.south) -- (Mucosal.north);
    \end{scope}
    \end{tikzpicture}
\end{document}

在此处输入图片描述

你也可以制作箭头来转向

\draw[->] (Gastric.south) -- ++(0,-1) -| (Symptoms.north);

(Gastric.south) -- ++(0,-1)从 向下 画一条线Gastric.south，长度为 1cm，并-| (Symptoms.north);画一个向 弯曲的箭头Symptoms.north。

\documentclass[tikz,border=10pt]{standalone}
\tikzset{block/.style ={rectangle,draw}
}
\begin{document}
\begin{tikzpicture} [
      node distance = 2cm and 0.8cm,
      >=stealth,
      scale=0.8,
      transform shape
    ]
    \node[block] at (2,3)  (Mechanism){Incompetent Lower esophageal sphincter};
    \node[block] at (2,0)  (Gastric){Gastric content into esophagus and beyond};
    \node[block] at (-2, -3) (Symptoms){Symptoms};
    \node[block] at (6, -3) (Mucosal){Mucosal damage};
    \node at (2,-3){and or};
    \begin{scope}[cyan!40!black]
    \draw[->] (Mechanism) -- (Gastric);
    \draw[->] (Gastric.south) -- ++(0,-1) -| (Symptoms.north);
    \draw[->] (Gastric.south) -- ++(0,-1) -| (Mucosal.north);
    \end{scope}
    \end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

您可以在标记的两个节点之间画线，而不是两个坐标之间画线。

\begin{tikzpicture} [
  node distance = 2cm and 0.8cm,
  >=stealth,
  scale=0.8,
  transform shape
]   
\node(a1) at (0,0) {Hello};
\node(a2) at (2,0) {World};
\draw[->] (a1) -- (a2);
\end{tikzpicture}

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