仅限 Beamer 且可见

Question

\begin{frame}{Convex polygon \& concave polygon}
    \begin{definition}
        A \textbf{convex} polygon has all its diagonals inside the polygon. \\
        A \textbf{concave} polygon has at least one diagonal outside the polygon.
    \end{definition}
        \only<2>{ \includegraphics[width=\textwidth]{concave_convex.pdf} }
        \only<3>{ \includegraphics[width=\textwidth]{concave_convex_ans.pdf} }
\end{frame}

目前，第一张幻灯片没有考虑到图表所占用的空间，如下所示：

我如何确保第一张幻灯片考虑到图表中，以便定义不是垂直居中。

谢谢。

Answer 1

编辑：看来最简单的解决方案是[t]向框架添加选项：

    \documentclass{beamer}

    \begin{document}
\begin{frame}[t]{Convex polygon \& concave polygon}
    \begin{definition}
        A \textbf{convex} polygon has all its diagonals inside the polygon. \\
        A \textbf{concave} polygon has at least one diagonal outside the polygon.
    \end{definition}
    \bigskip 
    \centering  
        \only<2>{\includegraphics[width=0.5\textwidth]{example-image-a}}
        \only<3>{\includegraphics[width=0.7\textwidth]{example-image-b}}   

\end{frame}
    \end{document}