2

I can generate the following but need to modify it to include shading of the intersection of circle A and B - C. Any suggestions?

\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);
\fillwhite!60 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}

enter image description here

Sebastiano
  • 54,118
user244196
  • 21

2 Answers2

2

One way to filling of the intersection of circle A and B-C is first filling the whole figure, then filling its complement. The following code is from here, and adding a filling with even odd rule

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

enter image description here

The code

\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}
Black Mild
  • 17,569
2

My suggestion it is humble. There is a very nice package venndiagram of Nicola L. C. Talbot. It is very simple. Check if the diagram is correct.

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

enter image description here

or this.....

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

enter image description here

Sebastiano
  • 54,118