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Beamer：如何将图像保留在其位置，同时仅用于显示文本

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Beamer：如何将图像保留在其位置，同时仅用于显示文本

这个问题和我的一个问题基本相同较早的一个，除了唯一的区别是我使用“仅”来更改同一位置的文本（即，这个问题）。换句话说，我在进行过程中会破坏我之前的文本，并且不会在之前的文本下面添加新的文本。

由于第一个“only”的文本比第二个“only”短，因此图像将移动位置。我希望图像保持在其位置。

以下是一个例子 在此处输入图片描述

在此处输入图片描述

可能不太明显，但第二张图像比第一张更高。

代码在这里，有人能找到解决方案吗？

\documentclass{beamer}

\usepackage{graphicx}

\title[Title]{Presentation}
\author{Sandro Botticelli}
\institute{Italy}
\date{1484}

\begin{document}


\begin{frame}
\begin{figure}
\includegraphics[scale = 0.8]{Venus}
    \caption{Nascita di Venere}
\end{figure}

\only<1>{In the centre the newly-born goddess Venus stands nude in a giant scallop shell. Its size is purely imaginary, and is also found in classical depictions of the subject. } 


\only<2>{Alternative identifications for the two secondary female figures involve those also found in the Primavera; the nymph held by Zephyr may be Chloris, a flower nymph he married in some versions of her story, and the figure on land may be Flora. Flora is generally the Roman equivalent of the Greek Chloris; in the Primavera Chloris is transformed into the figure of Flora next to her, following Ovid's Fasti, but it is hard to see that such a transformation is envisaged here.}
\end{frame}


\end{document}

答案1

正如@marmot 在他的评论中所建议的那样，\begin{frame}[t]我会这样做。我认为你无论如何都应该使用环境overprint。当你的图片不在顶部时也可以工作。

来自 beameruserguide：

这种方法（使用）的问题\only在于，它可能会导致线条高度出现轻微但令人讨厌的差异，这可能会导致整个框架在幻灯片之间“摆动”。如果替换文本有几行长，这个问题会变得更加严重。

为了解决这个问题，你可以使用两个环境：overlayarea 和 overprint。第一个更灵活，但不太人性化。

 \begin{overlayarea}{⟨area width⟩}{⟨area height⟩}
 ⟨environment contents⟩
 \end{overlayarea}

环境中的所有内容都将放置在指定大小的矩形区域中。无论其实际内容如何，​​该区域在帧的所有幻灯片上都将具有相同的大小。

例子：

\begin{overlayarea}{\textwidth}{3cm}
\only<1>{Some text for the first slide.\\Possibly several lines long.}
\only<2>{Replacement on the second slide.}
\end{overlayarea}
\begin{overprint}[⟨area width⟩]
 ⟨environment contents⟩
\end{overprint}

区域宽度默认为文本宽度。

这是您的 MWEoverprint

\documentclass{beamer}

\title[Title]{Presentation}
\author{Sandro Botticelli}
\institute{Italy}
\date{1484}

\begin{document}


\begin{frame}
\begin{figure}
\includegraphics[scale = 0.8]{Venus}
    \caption{Nascita di Venere}
\end{figure}

\begin{overprint}
    \onslide<1>{In the centre the newly-born goddess Venus stands nude in a giant scallop shell. Its size is purely imaginary, and is also found in classical depictions of the subject. } 
    \onslide<2>{Alternative identifications for the two secondary female figures involve those also found in the Primavera; the nymph held by Zephyr may be Chloris, a flower nymph he married in some versions of her story, and the figure on land may be Flora. Flora is generally the Roman equivalent of the Greek Chloris; in the Primavera Chloris is transformed into the figure of Flora next to her, following Ovid's Fasti, but it is hard to see that such a transformation is envisaged here.}
\end{overprint}
\end{frame}

\end{document}

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