TikZ：如何镜像椭圆标注？

Question

我在 Beamer 中使用 TikZ，并且想将椭圆标注镜像为 tikz 图片的一部分，以便它指向给定的节点。

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{positioning, shapes.callouts}
    
\begin{document}
\begin{frame}

\begin{tikzpicture}
\node(st){Something};
\node(ec)[ellipse callout, above right=of st, draw=black]{Comment};
\end{tikzpicture}

\end{frame}

  
\end{document}

Answer 1

两个选项：

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{positioning, shapes.callouts}
    
\begin{document}

\begin{frame}
\begin{tikzpicture}
\node(st){Something};
\node(ec)[
  ellipse callout, 
  above right=of st, 
  draw=black,
  callout relative pointer={(-1,-1)}
  ]{Comment};
\end{tikzpicture}
\end{frame}

\begin{frame}
\begin{tikzpicture}
\node(st){Something};
\node(ec)[
  ellipse callout, 
  above right=of st, 
  draw=black,
  callout absolute pointer={(st.north east)}
  ]{Comment};
\end{tikzpicture}
\end{frame}

  
\end{document}