回到我通常的问题，我希望从这个问题中获得乐趣，并寻求如何为下面的 tikz 图（维恩图）编写更好的程序的想法。 Marmot 告诉我不要嵌套 tikzpictures，所以这是一个解决方案。我对其他想法很感兴趣。随意修改！
\documentclass{article}
%\usepackage{geometry}
\usepackage{tikz}
\topmargin=-0.45in
\evensidemargin=0in
\oddsidemargin=0in
\textwidth=6.5in
\textheight=9.0in
\headsep=0.25in
\linespread{1.1}
\newcommand{\A}{\mathbf{A}}
\newcommand{\B}{\mathbf{B}}
\newcommand{\C}{\mathbf{C}}
\newcommand{\x}{\mathbf{x}}
\begin{document}
\def\thirdcircle{(0,0) ellipse (1.5cm and .5cm)} %%%%%% A
\def\secondcircle{(0,0) ellipse (2.25cm and .75cm)} %%%%%% B
\def\firstcircle{(0,0) ellipse (3cm and 1cm)} %%%%%% C
\def\Extracircle{(2,0) ellipse (1.1cm and 2cm)} %%%%%% Extra Set
C in part(c)
\colorlet{circle edge}{blue!50}
\colorlet{circle area}{blue!20}
\tikzset{filled/.style={fill=circle area, draw=circle edge, thick},
outline/.style={draw=circle edge, thick}}
\begin{center}
\begin{minipage}{.45\textwidth}
\begin{tikzpicture}
\begin{scope}
\clip \Extracircle;
\fill[filled] \thirdcircle;
\end{scope}
\draw[outline] \firstcircle node[right=2.25cm] {$\A$};
\draw[outline] \thirdcircle node [] {$\B$};
\draw[fill] (0:1) circle (1pt) node[right=1pt] {\scriptsize $\x$};
\draw[outline] \Extracircle node[above=1cm] {$\C$};
\node at (0,-2) [below] {$\mathbf{B \cap C}$};
\node at (4,-2) [below] {$\mathbf{\subset}$};
\end{tikzpicture}
\end{minipage}
\begin{minipage}{.45\textwidth}
\begin{tikzpicture}
\begin{scope}
\clip \Extracircle;
\fill[filled] \firstcircle;
\end{scope}
\draw[outline] \firstcircle node[right=2.25cm] {$\A$};
\draw[outline] \thirdcircle node [] {$\B$};
\draw[fill] (0:1) circle (1pt) node[right=1pt] {\scriptsize $\x$};
\draw[outline] \Extracircle node[above=1cm] {$\C$};
\node at (0,-2) [below] {$\mathbf{A \cap C}$};
\end{tikzpicture}
\end{minipage}
\end{center}
\end{document}
输出：
答案1
首先，如果你对结果很满意，并且没有任何问题，你可以保持原样，不要试图“改进”它。既然你在这里问，这里有一些建议（重点是 Ti钾Z 部分并忽略页面几何问题，可以通过真正使用geometry包来更优雅地解决这些问题。）
这是一些已发生改变的代码。
- 这里没有使用 minipages，而是将两个部分放在了范围内（使用
local bounding boxes）。这在调整距离时会有所帮助，特别是现在图形确实居中了。在您的示例中，minipages 居中，但图形不一定居中。（我个人可能会\centering在这里使用。） - 各种省略号不再存储在宏中，而是存储在 Ti 中钾Z 样式。（这不一定是“更好”，但可以被认为是 Ti钾子儿。 ;-)
- 我还添加了一些应用程序
even odd rule，Dave 同时提到了这一点。
\documentclass{article}
%\usepackage{geometry}
\usepackage{tikz}
\usetikzlibrary{patterns}
\topmargin=-0.45in
\evensidemargin=0in
\oddsidemargin=0in
\textwidth=6.5in
\textheight=9.0in
\headsep=0.25in
\linespread{1.1}
\newcommand{\A}{\mathbf{A}}
\newcommand{\B}{\mathbf{B}}
\newcommand{\C}{\mathbf{C}}
\newcommand{\x}{\mathbf{x}}
\begin{document}
C in part(c)
\colorlet{circle edge}{blue!50}
\colorlet{circle area}{blue!20}
\tikzset{filled/.style={fill=circle area, draw=circle edge, thick},
outline/.style={draw=circle edge, thick}}
\begin{center}
\begin{tikzpicture}[standard ellipse/.style={insert path={(0,0) ellipse (#1*1.5cm and #1*.5cm)}},
standard ellipse/.default=1,
extra circle/.style={insert path={(2,0) ellipse (1.1cm and 2cm)}}]
\begin{scope}[local bounding box=left]
\coordinate (O) at (0,0);
\begin{scope}
\clip[extra circle];
\fill[filled,standard ellipse];
\end{scope}
\draw[outline,standard ellipse=2] node[right=2.25cm] {$\A$};
\draw[outline,standard ellipse] node [] {$\B$};
\draw[fill] (0:1) circle (1pt) node[right=1pt,font=\scriptsize] {$\x$};
\draw[outline,extra circle] node[above=1cm] {$\C$};
\node at (0,-2) [below] {$\mathbf{B \cap C}$};
\node at (4,-2) [below] {$\mathbf{\subset}$};
\end{scope}
\begin{scope}[local bounding box=right,shift={([xshift=3cm]left.east|-O)}]
\begin{scope}
\clip[extra circle];
\fill[filled,standard ellipse=2];
\path[pattern=north east lines,even odd rule,standard ellipse=2,standard
ellipse=1];
\end{scope}
\draw[outline,standard ellipse=2] node[right=2.25cm] {$\A$};
\draw[outline,standard ellipse] node [] {$\B$};
\draw[fill] (0:1) circle (1pt) node[right=1pt,font=\scriptsize] {$\x$};
\draw[outline,extra circle] node[above=1cm] {$\C$};
\node at (0,-2) [below] {$\mathbf{A \cap C}$};
\end{scope}
\end{tikzpicture}
\end{center}
\end{document}
