如何弯曲文本以使其遵循维恩图的曲线

Question

我需要让“A 类”、“B 类”、“C 类”沿着紧邻它们的圆的曲线行进：

\documentclass{article}

\usepackage[english]{babel}

\usepackage[utf8]{inputenc}

\usepackage{amsmath}

\usepackage{tikz}

\usetikzlibrary{arrows.meta}
\usetikzlibrary{decorations.text}

\begin{document}

\begin{tikzpicture}[scale=0.85]
\foreach \X [count=\Y starting from 2] in {\textit{A},\textit{B},\textit{C}}
{\draw (-\Y,-\Y/2) circle ({1.5*\Y} and \Y);
\node at (1-2*\Y,-1.1*\Y) {$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $  $ $   classes \X}; }
\draw ([xshift=-0.5cm,yshift=-0.5cm]current bounding box.south west)
rectangle ([xshift=0.5cm,yshift=0.5cm]current bounding box.north east);
\node[anchor=south] at (current bounding box.north) {\textbf{Three classes}};
\end{tikzpicture}


\end{document}

Answer 1

像这样吗？

\documentclass{article}

\usepackage[english]{babel}

\usepackage[utf8]{inputenc}

\usepackage{amsmath}

\usepackage{tikz}

\usetikzlibrary{arrows.meta} 
\usetikzlibrary{decorations.text}

\begin{document}

\begin{tikzpicture}[scale=0.85] 
\foreach \X [count=\Y starting from 2] in 
{A,B,C} 
{\draw (-\Y,-\Y/2) circle ({1.5*\Y} and \Y);
\path[decoration={text along path,
text={classes |\itshape|\X},text align=center,raise=0.2em},decorate] (-\Y,-\Y/2) +(-1.5*\Y,0) arc(180:360:{1.5*\Y} and \Y);
} 
\draw ([xshift=-0.5cm,yshift=-0.5cm]current bounding box.south west) 
rectangle ([xshift=0.5cm,yshift=0.5cm]current bounding box.north east); 
\node[anchor=south] at (current bounding box.north) {\textbf{Three classes}}; 
\end{tikzpicture}

\end{document}`