我正在嘗試從中心圓（大會）到經濟及社會理事會和國際刑事法院圓畫線，使得所有三個圓上的線的入射角都是 0 度，即該線位於與圓表面成90 度角。現在，這就是我所擁有的。
\documentclass{article}
\usetikzlibrary{calc}
\usetikzlibrary{matrix, shapes}
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{snakes}
\usetikzlibrary{positioning, intersections}
\pgfplotsset{compat=1.10}
\begin{document}
\begin{figure}[H]
\label{fig:structure}
\centering
\begin{tikzpicture}
\node[xshift=6cm,draw,regular polygon, regular polygon sides=4,text width=3cm,align=center] (sa)
{{\Large Specialized agencies}:\\
\textbullet FAO\\
\textbullet ILO\\
\textbullet ITU\\
\textbullet WHO};
\node[minimum size= 4.5cm, xshift=12cm,draw,circle, text width=3cm,align=center] (ga) {\Large{General Assembly}\\
\small{1 nation, 1 vote}};
\node[xshift=12cm,yshift=-5cm,draw, circle, text width=3cm,align=center] (sc) {\Large Security Council\\
\small{5 permanent members\\
10 rotating members chosen by GA}};
\node[xshift=12cm,yshift=5cm,draw,circle, text width=3cm,align=center] (sg) {\Large Secretary General\\
\small{Supports GA decisions}};
\node[xshift=17cm,yshift=2cm,draw,circle, text width=3cm,align=center] (ecsoc) {\Large Economic and Social Council
};
\node[xshift=17cm,yshift=-2cm,draw,circle, text width=3cm,align=center] (icc) {\Large International Criminal Court
};
\draw (sa.east) -- (ga.west);
\draw (sg.south) -- (ga.north);
\draw (sc.north) -- (ga.south);
\draw (ga.east) -- (ecsoc.west);
\draw (ga.east) -- (icc.west);
\end{tikzpicture}
\caption{Structure of the United Nations}
\end{figure}
\end{document}
答案1
如果您的意思是它們必須垂直於圓邊界，則不要--使用 ，edge[out=0, in=180]而是使用 in \draw (ga.east) edge[out=0, in=180] (ecsoc.west);。這樣，線以 0 度（右）退出，以 180 度（左）進入。
另外，將 Tikz 庫全部寫在一個地方，用逗號分隔，後您呼叫 Tikz 包，這樣它就不會產生錯誤。我通常會列出我需要的所有包，然後在所有可用的情況下列出庫。這樣它也更容易理解並且更有組織性。
\documentclass{article}
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{positioning, intersections, calc, matrix, shapes, snakes}
\pgfplotsset{compat=1.10}
\begin{document}
\begin{figure}[H]
\label{fig:structure}
\centering
\begin{tikzpicture}
\node[xshift=6cm,draw,regular polygon, regular polygon sides=4,text width=3cm,align=center] (sa)
{{\Large Specialized agencies}:\\
\textbullet FAO\\
\textbullet ILO\\
\textbullet ITU\\
\textbullet WHO};
\node[minimum size= 4.5cm, xshift=12cm,draw,circle, text width=3cm,align=center] (ga) {\Large{General Assembly}\\
\small{1 nation, 1 vote}};
\node[xshift=12cm,yshift=-5cm,draw, circle, text width=3cm,align=center] (sc) {\Large Security Council\\
\small{5 permanent members\\
10 rotating members chosen by GA}};
\node[xshift=12cm,yshift=5cm,draw,circle, text width=3cm,align=center] (sg) {\Large Secretary General\\
\small{Supports GA decisions}};
\node[xshift=17cm,yshift=2cm,draw,circle, text width=3cm,align=center] (ecsoc) {\Large Economic and Social Council
};
\node[xshift=17cm,yshift=-2cm,draw,circle, text width=3cm,align=center] (icc) {\Large International Criminal Court
};
\draw (sa.east) -- (ga.west);
\draw (sg.south) -- (ga.north);
\draw (sc.north) -- (ga.south);
\draw (ga.east) edge[out=0, in=180] (ecsoc.west);
\draw (ga.east) edge[out=0, in=180] (icc.west);
\end{tikzpicture}
\caption{Structure of the United Nations}
\end{figure}
\end{document}
順便說一句，您可以透過添加關鍵「鬆散度」來修改曲線外觀。預設值為 1，0 建立直線，增加數字會突出曲線。這是一個例子（黑色的是標準的，或1）：
\documentclass{standalone}
\usepackage{tikz}
\usepackage{pgfplots}
\usetikzlibrary{positioning, intersections, calc, matrix, shapes, snakes}
\pgfplotsset{compat=1.10}
\begin{document}
\begin{tikzpicture}
\node[draw, circle, text width=3cm, align=center] (ga) {\Large General Assembly};
\node[draw, circle, text width=3cm, align=center, xshift=6cm, yshift=3cm] (ecsoc) {\Large Economic and Social Council};
\draw[green] (ga.east) edge[out=0, in=180, looseness=0] (ecsoc.west);
\draw (ga.east) edge[out=0, in=180, looseness=1] (ecsoc.west);
\draw[red] (ga.east) edge[out=0, in=180, looseness=5] (ecsoc.west);
\draw[blue] (ga.east) edge[out=0, in=180, looseness=10] (ecsoc.west);
\end{tikzpicture}
\end{document}