我该如何为这个维恩图着色？我需要为另一个区域着色。有什么建议吗？

Question

我可以生成以下内容，但需要修改它以包含圆 A 和 B - C 交点的阴影。有什么建议吗？

\documentclass[border=0.2cm]{standalone}
% Required packages
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz}
 
\begin{document}
\begin{tikzpicture}[thick,
    set/.style = {circle,
        minimum size = 3cm,
        fill=black!30}]
% Set A
\node[set,label={135:$A$}] (A) at (0,0) {};
 
% Set B
\node[set,fill=white, label={45:$B$}] (B) at (1.8,0) {};
 
% Set C
\node[set,label=$C$] (C) at (0.9,1.5) {};
 
% Intersection
\begin{scope}
    
\clip (0,0) circle(1.5cm);
\clip (1.8,0) circle(1.5cm);
\clip (0.9,1.5) circle(1.5cm);
\fill[white!60](1.8,0) circle(1.5cm);
    
\end{scope}

% Circles outline
\draw (0,0) circle(1.5cm);
\draw (1.8,0) circle(1.5cm);
\draw (0.9,1.5) circle(1.5cm);
 
\end{tikzpicture}
 
\end{document}

Answer 1

填充圆 A 和 BC 交点的一种方法是先填充整个图形，然后填充其补图。以下代码来自这里，并添加填充even odd rule

\fill[gray!20,draw,even odd rule] \cirA \cirB;

代码

\documentclass[tikz,border=0.2cm]{standalone}
\begin{document}
\begin{tikzpicture}[thick]
\def\r{1.5} % radius of two circles
\def\d{1}   % distance of two centers
\def\cirA{(210:\d) circle(\r)}
\def\cirB{(-30:\d) circle(\r)}
        
\draw[fill=yellow] 
\cirA +(135:\r+.3) node{$A$} 
\cirB +(45:\r+.3)  node{$B$};       
        
% Fill the complement of intersection of A and B-C
\begin{scope}
\clip \cirA;
\clip \cirB;
\draw[fill=gray!20] (90:\d) circle(\r);
\end{scope}

\fill[gray!20,draw,even odd rule] \cirA \cirB;
        
% Circles outline
\draw \cirA \cirB;
\end{tikzpicture}
\end{document}

Answer 2

我的建议很谦虚。有一个非常好的包装文图Nicola LC Talbot 的作品。非常简单。检查图表是否正确。

\documentclass{standalone}
\usepackage{venndiagram}
\begin{document}
\begin{venndiagram3sets}
\fillACapBNotC
\end{venndiagram3sets}
\end{document}

或这个.....

\documentclass{standalone}
\usepackage{venndiagram}
\begin{document}
\begin{venndiagram3sets}
\fillACapBCapC
\end{venndiagram3sets}
\end{document}