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在偶数页上插入不同的图形

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在偶数页上插入不同的图形

有时对某个图表的讨论会跨越数页，而我想在讨论继续进行时在每个偶数页上插入该图表的副本。

有一个与此密切相关的问题（每页后插入一张图片) 但所需的效果是在前言中设置一张图片，并将其插入到整个文档的每个偶数页中。而我想根据需要对不同的图形进行这种插入，即我需要一个宏来告诉在偶数页上包含哪个图形，直到我发出另一个宏，说插入现在必须结束。

我的 MWE 如下，但我只表达了我所追求的。我对如何继续下去一无所知。

有什么建议么？

\documentclass[12pt]{amsbook}
\usepackage{mwe,lipsum}
\begin{document}
\includegraphics[width=0.5\textwidth]{example-image-a}
%
% Now I want "example-image-a", or  a re-scaled smaller version, to be inserted at the beginning of every even numbered page until the end of \lipsum or until I say so.
%
%

\lipsum[1-18]
%

\includegraphics[width=0.5\textwidth]{example-image-b}
%
% Now I want "example-image-b", or a re-scaled smaller version, to be inserted at the beginning of every even numbered page until the end of \lipsum or until I say so.
%
%

\lipsum
%
\end{document}

答案1

如果您对所指的解决方案感到满意，除了您提到的功能之外，还有一个简单的解决方法：制作图片宏，然后进行调整。

\documentclass{article}
\usepackage{afterpage,everypage}
\usepackage{mwe,lipsum}
\AddEverypageHook{%
\ifodd\value{page}
\OddPicture%
\else%
\EvenPicture%
\fi}
\afterpage{\includegraphics{example-image-a}}  %  why this is necessary?
\newcommand{\OddPicture}{}
\newcommand{\EvenPicture}{\afterpage{\includegraphics{example-image-a}}}
\newcommand{\StopPictures}{%
\renewcommand{\OddPicture}{}
\renewcommand{\EvenPicture}{}
}
\begin{document}
\lipsum[1-18]

\StopPictures
\lipsum
\renewcommand{\OddPicture}{\afterpage{\includegraphics{example-image-b}}}
\renewcommand{\EvenPicture}{}


\lipsum

\lipsum

\StopPictures
\lipsum
\end{document}

此代码片段导致文档在偶数页上暂时显示 example-image-a，然后切换到奇数页上的 example-image-b。

答案2

从 everypage 包中读到“...一旦钩子被堆叠，就没有办法取消堆叠，也没有办法清除它们。...条件必须包含在钩子中”我想出了以下解决方案：

\documentclass[12pt]{amsbook}
\usepackage{afterpage,everypage}
\usepackage{mwe,lipsum}
\usepackage{sidenotes}

\usepackage[dvipsnames]{xcolor} % For this example only

\AddEverypageHook{%
\ifodd\value{page}
\else%
\EvenPicture%
\fi}

\newcommand{\Picture}{}
\newcommand{\EmptyPicture}{}
\newcounter{permission}
\setcounter{permission}{0}

\afterpage{\ifnum\value{permission}=1%
 \begin{center}%
 {\includegraphics[width=0.5\textwidth]{\Picture}}
 \end{center}%
 \else\EmptyPicture\fi}
% This is needed for the first time \EvenPicture is called

\newcommand{\EvenPicture}{{\afterpage{\ifnum\value{permission}=1%
 \begin{center}%
 {\includegraphics[width=0.5\textwidth]{\Picture}}%
 \end{center}%
 \else\EmptyPicture\fi}}}

\newcommand{\StartPicture}[1]{%
 \renewcommand{\Picture}{#1}%
 \begin{center}\includegraphics{#1}\end{center}%
 \setcounter{permission}{1}%
}

\newcommand{\StopPicture}{\setcounter{permission}{0}}

\begin{document}
\lipsum[1-3]

\StartPicture{example-image-a}

\lipsum[2-13]

\StopPicture
\textcolor{red}{We terminate figure A here}

\textcolor{green}{Now we start figure B}

\StartPicture{example-image-b}

\lipsum[3-19]

\StopPicture
\textcolor{red}{We terminate figure B here}

\lipsum[1]

\textcolor{green}{Now we start figure C}

\StartPicture{example-image-c}


\lipsum[4-11]


\StopPicture
\textcolor{red}{We terminate figure C here}

\lipsum[5-15]

\end{document}

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