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Beamer：将内容（带暂停！）放在后台

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Beamer：将内容（带暂停！）放在后台

我怎样才能将 pgf 图像的内容放在标题栏后面？我尝试使用如何在投影仪框架中插入背景图像？但如果框架有动画，此方法就会失败，而且pgfonlayer似乎没有帮助。

在此处输入图片描述

平均能量损失

\documentclass[]{beamer}
\usepackage{tikz}
\usepackage[most]{tcolorbox}
\usetikzlibrary{backgrounds}

% Frame title
\defbeamertemplate*{frametitle}{ubuntu}[1][]
{%
  \begin{tcolorbox}[enhanced,sharp corners,spread upwards,frame hidden,boxrule=0pt,interior style tile={width=\paperwidth}{example-image-a},before skip=0pt,halign=center]
    \usebeamercolor{frametitle}\color{fg}
    \insertframetitle
  \end{tcolorbox}
}

\begin{document}

%% FRAME_START
\begin{frame}{Foo}
    \begin{tikzpicture}[overlay,remember picture]
    \begin{pgfonlayer}{background} % <--- this does not help, even if I wrap the tcolorbox inside a tikzpicture
      \draw[fill=red] ([shift={(5mm,-5mm)}]current page.north west) rectangle (current page.south east);
      \node<+-> at (current page.center) {I'd like this picture to be behind the header.};
      \node<+-> at ([yshift=-1cm]current page.center) {And I want to be able to put pauses in my picture like this.};
    \end{pgfonlayer}
  \end{tikzpicture}  
\end{frame}

\end{document}

答案1

背景层tikzpicture仍是图片的一部分。它不会神奇地沉入图片之外的东西后面——就像绘画的背景不会沉入画布后面一样。

要将内容放在幻灯片的背景中，您需要 Beamer 方法 --- 而不是 Ti钾Z. 有关各种可用层的详细信息，请参阅 Beamer 手册。除 之外background canvas，background可能也会引起人们的兴趣。

您想要设置（可能在定义之后）相关的 Beamer 模板 - 就像您对标题元素所做的那样。

下面是一个示例，说明如何定义和设置background canvas有或无 Ti钾Z. 对于简单的阴影或色块，请使用 Beamer 方法。对于更复杂的效果，请使用tikzpicture或类似方法。

\documentclass[]{beamer}
\usepackage{tikz}
\usepackage[most]{tcolorbox}

% Frame title
\defbeamertemplate*{frametitle}{ubuntu}[1][]
{%
  \begin{tcolorbox}[enhanced,sharp corners,spread upwards,frame hidden,boxrule=0pt,interior style tile={width=\paperwidth}{example-image-a},before skip=0pt,halign=center]
    \usebeamercolor{frametitle}\color{fg}
    \insertframetitle
  \end{tcolorbox}%
}
\defbeamertemplate{background canvas}{red box}{\color{red}\vrule width\paperwidth height\paperheight}

\begin{document}

\setbeamertemplate{background canvas}[red box]
%% FRAME_START
\begin{frame}{Foo}
    \begin{tikzpicture}[overlay,remember picture]
      \node<+-> at (current page.center) {I'd like this picture to be behind the header.};
      \node<+-> at ([yshift=-1cm]current page.center) {And I want to be able to put pauses in my picture like this.};
  \end{tikzpicture}  
\end{frame}
\setbeamertemplate{background canvas}{% use a minipage if you don't want the image to occupy the whole area - you probably want to set background rather than background canvas in this case
%   \begin{minipage}[t]{\paperwidth}
    \includegraphics[height=\paperheight,width=\paperwidth]{example-image-a}%
%   \end{minipage}%
}
\begin{frame}{Image}
  With an image.
\end{frame}
\setbeamertemplate{background canvas}{%
  \begin{tikzpicture}[x=\paperwidth,y=\paperheight]
    \fill [left color=blue,right color=green] (0,0) rectangle (1,1);
    \foreach \i [evaluate=\i as \j using int(\i+2)] in {0,2,4,6,8} \fill [white,opacity=\i/10] (0,\i/10) rectangle (\paperwidth,\j/10);
  \end{tikzpicture}%
}
\begin{frame}{Pic}
  With a picture.
\end{frame}
\setbeamertemplate{background canvas}[default]
\begin{frame}{Default}
  Sans.
\end{frame}

\end{document}

由于 Okular 错误，目前没有可用的图像。很抱歉剥夺了读者的观看机会example-image-a。

不存在暂停等问题 - 这些都不会影响内容frame。

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