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模板的“背景”和“背景画布”有什么区别？

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模板的“背景”和“背景画布”有什么区别？

有什么区别：

\setbeamertemplate{background}{
\begin{tikzpicture}[remember picture,overlay]
\shade[top color=yellow!75!green!33,bottom color=blue!66!green!33,middle color=blue!6!green!33]
  ([shift={(0.0cm,0.0cm)}]current page.north west)
     rectangle
  ([shift={(0.0cm,0.0cm)}]current page.south east);
\end{tikzpicture}  
}

和：

\setbeamertemplate{background canvas}{
\begin{tikzpicture}[remember picture,overlay]
\shade[top color=yellow!75!green!33,bottom color=blue!66!green!33,middle color=blue!6!green!33]
  ([shift={(0.0cm,0.0cm)}]current page.north west)
     rectangle
  ([shift={(0.0cm,0.0cm)}]current page.south east);
\end{tikzpicture}  
}

第一个表现正常，第二个每次重建时表现随机？我用pdflatex和gummi（预览）构建它。第二个在我不重建而是从头构建时不显示任何背景。对我来说很奇怪。

编辑：甚至第一个也以不同的主题随机行事......

答案1

来自beamer用户指南：

在此处输入图片描述

因此，background canvas一切都在后面，然后才是background主要内容。

比较这些代码：

\documentclass{beamer}
\usepackage{tikz}
\setbeamertemplate{background}{
\begin{tikzpicture}[remember picture,overlay]
\node at (current page.center) {here};
\end{tikzpicture}
}
\setbeamertemplate{background canvas}{
\begin{tikzpicture}[remember picture,overlay]
\shade[top color=yellow!75!green!33,bottom color=blue!66!green!33,middle color=blue!6!green!33]
  ([shift={(0.0cm,0.0cm)}]current page.north west)
     rectangle
  ([shift={(0.0cm,0.0cm)}]current page.south east);
\end{tikzpicture}
}
\begin{document}
  \begin{frame}
    Some
  \end{frame}
\end{document}

在此处输入图片描述

和

\documentclass{beamer}
\usepackage{tikz}
\setbeamertemplate{background canvas}{
\begin{tikzpicture}[remember picture,overlay]
\node at (current page.center) {here};
\end{tikzpicture}
}
\setbeamertemplate{background}{
\begin{tikzpicture}[remember picture,overlay]
\shade[top color=yellow!75!green!33,bottom color=blue!66!green!33,middle color=blue!6!green!33]
  ([shift={(0.0cm,0.0cm)}]current page.north west)
     rectangle
  ([shift={(0.0cm,0.0cm)}]current page.south east);
\end{tikzpicture}
}
\begin{document}
  \begin{frame}
    Some
  \end{frame}
\end{document}

在此处输入图片描述

首先，您看到的here是中心，其次，它位于后面（因为它在里面）background canvas。

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