4
\begin{tikzpicture}[fill=gray]
    \scope
        \clip (2.7,-2.54) rectangle (-1.5,1.5)
         (0,0) circle (1)
         (1.2,0) circle (1);
         \fill (0.6,-1.04) circle (1);
    \endscope
        \draw (0,0) circle (1) (0,1)  node [text=black,above] {$A$}
              (1.2,0) circle (1) (0,1)  node [text=black,above right,shift={(1,0.01)}] {$B$}
              (0.6,-1.04) circle (1) (1.1,-0.6) node [text=black, shift={(0.6,-1.1)}] {$C$}
              (2.7,-2.54) rectangle (-1.5,1.5) node [text=black,above] {};
\end{tikzpicture}

This is the output of the above code - not quite what I want. If you understand the set notation in my question you'll understand that I want C to be filled in except for the little middle section of the diagram where A and B and C are all intersecting (i.e. I want to not shade in the region corresponding to the set whose members are common to A and B and C).

I am not smart enough to work out how to use clipping to achieve this. Please help me!

mac
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Noam Hudson
  • 51
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    Hi there! I recommend putting "venn" into the search box in http://www.texample.net/ You'll get many useful examples which should be helpful. Also, there is a tutorial on Venn diagrams on our website: https://tex.stackexchange.com/a/9682/11002 – yo' Aug 14 '17 at 07:39
  • Welcome to TeX.SX! – Bobyandbob Aug 14 '17 at 07:45
  • Attention all! Feel free to try to answer this question as I've set it up, but I've decided to simply insert an image of a Venn Diagram into my document for this case – Noam Hudson Aug 14 '17 at 07:46

3 Answers3

11

You can use the vendiagram package. Its very easy to use. Do you mean something like this?

\documentclass[]{article}
\usepackage{tikz,venndiagram}

\begin{document}

\begin{venndiagram3sets}
\fillOnlyC
\fillBCapCNotA
\fillACapCNotB
\end{venndiagram3sets}
\[ C\setminus (A \cap B \cap C) \]
\end{document}

enter image description here

mac
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6

The following code should do what you want (based on http://www.texample.net/tikz/examples/venn-diagram/):

\documentclass[border=2mm]{standalone}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\fill[gray] (0.6,-1.04) circle (1);
\begin{scope}
  \clip (0.6,-1.04) circle (1);
  \clip (1.2,0) circle (1);
  \fill[white] (0,0) circle (1);
\end{scope}
\draw (0,0) circle (1) (0,1) node [text=black,above] {$A$};
\draw (1.2,0) circle (1) (1,1.01) node [text=black,above right] {$B$};
\draw (0.6,-1.04) circle (1) (1.7,-1.7) node [text=black] {$C$};

\draw (2.7,-2.54) rectangle (-1.5,1.5);
\end{tikzpicture}

\end{document}

Output

epR8GaYuh
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  • I did not know that you can use two clip commands in the same scope. I like your answer better than mine. – crixstox Aug 14 '17 at 11:51
5

Requested Answer for C \setminus (A \cap B \cap C)

To draw enter image description here you can nest two scopes and clips as follows.

\begin{tikzpicture}
    % frame
    \draw (2.7,-2.54) rectangle (-1.5,1.5);
    % area
    \fill[gray] (0.6,-1.04) circle (1);
    \begin{scope}
        \clip (0.6,-1.04) circle (1) (1.1,-0.6);
        \begin{scope}
            \clip (0,0) circle (1);                
            \fill[white] (1.2,0) circle (1) (0,1);
        \end{scope}
    \end{scope}
    % outline
    \draw (0,0) circle (1) (0,1)  node [text=black,above] {$A$};
    \draw (1.2,0) circle (1) (0,1)  node [text=black,above right,shift={(1,0.01)}] {$B$};
    \draw (0.6,-1.04) circle (1) (1.1,-0.6) node [text=black, shift={(0.6,-1.1)}] {$C$};
\end{tikzpicture}

enter image description here

Not requested answer for C \setminus (A \cap B)

To draw enter image description here you do not need neither clipping nor the "even odd rule", just draw circle in the right order.

\begin{tikzpicture}
    % frame
    \draw (2.7,-2.54) rectangle (-1.5,1.5);
    % area
    \fill[gray] (0.6,-1.04) circle (1);
    \fill[white] (0,0) circle (1) (0,1);
    \fill[white] (1.2,0) circle (1);
    % outline
    \draw (0,0) circle (1) (0,1)  node [text=black,above] {$A$};
    \draw (1.2,0) circle (1) (0,1)  node [text=black,above right,shift={(1,0.01)}] {$B$};
    \draw (0.6,-1.04) circle (1) (1.1,-0.6) node [text=black, shift={(0.6,-1.1)}] {$C$};
\end{tikzpicture}

This gives the result.

enter image description here

crixstox
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