latex做三个部分交叠在一起的圆圈

在LaTeX中制作三个部分交叠在一起的圆圈，可以使用`tikz`包中的`path picture`和`circle`命令。以下是一个简单的例子，它创建了一个由三个大小不同的圆圈组成的图形，它们彼此部分重叠：

\documentclass{article}
\usepackage{tikz}

\begin{document}
\newcommand{\OverlapCircles}[4][blue]{%
    \begin{tikzpicture}[
        scale=#1,
        path picture={
            \draw [fill=black] circle (0.5);
            \foreach \i in {1,...,#2} {
                \pgfmathsetmacro{\angle}{90 - (\i-1)*120}
                \node [circle, draw=white, fill=none, rotate=\angle] at (0.5,0) {%
                    \pgfinterruptpath
                        \pgftransformshift{\pgfpoint{-#3 pt}{-\#3 pt}}
                        \node[inner sep=0pt, outer sep=0pt] {\scalebox{#4}{$\bigcirc$}};
                    \endpgfinterruptpath
                };
            }
        },
    ]
    \path picture {};
\end{tikzpicture}
}

% 使用示例
\OverlapCircles[red, 3, 4pt, 0.7]
\OverlapCircles[green!50!black, 4, 6pt, 0.8]
\OverlapCircles[blue, 5, 8pt, 0.9]