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在投影机中循环播放几张背景图像

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在投影机中循环播放几张背景图像

我有一个包含多幅图像的图像目录：

p1.jpg
p2.jpg
p3.jpg
p4.jpg

我还有以下将背景图像设置为框架的环境：

\newenvironment{imageframe}[1]
{% Set background image
\usebackgroundtemplate{%
  \begin{tikzpicture}[remember picture,overlay]%
    \node[inner sep=0] at (current page.center) {\includegraphics[width=\paperwidth,height=\paperheight]{#1}};%
  \end{tikzpicture}%
}%
\begin{frame}%
}
{
\end{frame}%
}

使用方式如下：

\begin{imageframe}{p1.jpg}
  \frametitle{Nothing was the same.}
  Always felt like my vision been bigger than the bigger picture.
\end{imageframe}

我想创建变量（或命令）来保存有效背景图像列表（p1.jpg，...，p4.jpg），然后在调用环境时不明确指定图像路径。相反，第一次调用 imageframe 时应选择第一幅图像（p1.jpg），第二次调用第二幅图像（p2.jpg），依此类推。溢出应循环回到 p1.jpg。

答案1

无需计数器，也无需提前告知图像数量：只需按照显示的方式定义图像列表即可。

\documentclass{beamer}
\usepackage{tikz}

\newenvironment{autoimageframe}
 {% Set background image
  \usebackgroundtemplate{%
    \begin{tikzpicture}[remember picture,overlay]
    \node[inner sep=0] at (current page.center) {%
      \includegraphics[width=\paperwidth,height=\paperheight]{\currentbgimage}%
    };
    \end{tikzpicture}%
    \expandafter\swapbgimage\bgimagelist
  }%
  \begin{frame}}
 {\end{frame}}
\newcommand\currentbgimage{\expandafter\usebgimage\bgimagelist}
\newcommand{\usebgimage}{}
\def\usebgimage#1#2\bgimagelist{#1}
\newcommand{\swapbgimage}{}
\def\swapbgimage#1#2\bgimagelist{%
  \gdef\bgimagelist{#2{#1}\bgimagelist}%
}

% Define here the list of images
% Each image is in a braced group
% REMEMBER to have \bgimagelist at the end
\newcommand\bgimagelist{
  {example-image}
  {example-image-a}
  {example-image-b}
  {example-image-c}
  \bgimagelist
}

\begin{document}

% Thanks to Percusse for the code here
\foreach\x in{1,...,9}{
\begin{autoimageframe}
  \frametitle{Nothing was the same.}
  Always felt like my vision been bigger than the bigger picture.
\end{autoimageframe}
}

\end{document}

在此处输入图片描述

宏\currentbgimage使用列表中的第一个项目；然后\swapbgimage将第一个项目放在末尾。

答案2

您可以生成一些宏和一个名称列表并通过mod操作循环执行。

\documentclass{beamer}
\usepackage{tikz,mwe}% For dummy images

\newcounter{backgroundimagecounter}
\setcounter{backgroundimagecounter}{0}
\newenvironment{autoimageframe}
{% Set background image
\usebackgroundtemplate{%
  \begin{tikzpicture}[remember picture,overlay]%
    \pgfmathsetmacro\currentbackgroundimage{\backgroundimagenamelist[int(Mod(\value{backgroundimagecounter},\numberofbackgroundimages))]}%
    \node[inner sep=0] at (current page.center) {\includegraphics[width=\paperwidth,height=\paperheight]{\currentbackgroundimage}};%
  \end{tikzpicture}%
\stepcounter{backgroundimagecounter}%
}%
\begin{frame}%
}
{
\end{frame}%
}
\def\backgroundimagenamelist{{
"example-image",
"example-image-a",
"example-image-b",
"example-image-c"}}
\def\numberofbackgroundimages{4}

\begin{document}
\foreach\x in{1,...,9}{
\begin{autoimageframe}
  \frametitle{Nothing was the same.}
  Always felt like my vision been bigger than the bigger picture.
\end{autoimageframe}
}

\end{document}

在此处输入图片描述

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