自动在文档末尾排版致谢

Question

我想在文档的最后一页打印一些图形（包含一些致谢等）。我不知道最终文档的长度，因为它是模板，因此我需要一个更通用的解决方案，而不是手动摆弄htbp限定符\clearpage等。这是我的 MWE：

\documentclass{article}
\usepackage[a6paper,margin=0.5cm,landscape]{geometry}
\usepackage{graphicx}
\usepackage{blindtext}
\pagestyle{empty}
\begin{document}
    \raggedbottom
    \blindtext\footnote{A footnote.}
    % uncomment to move float to the next page
    %\blindtext
    \begin{figure}[bp!]
        \includegraphics[draft,width=\linewidth,height=2cm]{documentfooter.pdf}
    \end{figure}
\end{document} 

如果最后一页的文本过多，浮动内容会移至第二页。但现在浮动内容在该页上垂直居中，而不是在底部对齐。

此外，脚注应排版在致谢部分上方。理想情况下，直接附在上面的文本上，而不是致谢部分。事实上，文档的所有内容（例如其他图表、表格等）都必须位于致谢开始之前。

致谢部分不必包含在图中。但这是我能想到的唯一方法。请注意，页码等的位置不应受到解决方案的影响。

Answer 1

这会将图像添加为最后一页页脚的一部分：

\documentclass{article}
\usepackage[a6paper,margin=0.5cm,landscape]{geometry}
\usepackage{graphicx}
\usepackage{blindtext}
\pagestyle{empty}
\AtEndDocument{\enlargethispage{-2.5cm}\thispagestyle{credits}}
\makeatletter
\def\ps@credits{%
\def\@oddfoot{\hfill
        \smash{\includegraphics[draft,width=\linewidth,height=2cm]{documentfooter.pdf}}%
        \hfill}}

\makeatother

\begin{document}
    \raggedbottom
    \blindtext\footnote{A footnote.}
    % uncomment to move float to the next page
    %\blindtext



\end{document} 

---

我 (Steven Segletes) 觉得根据 David 的回答做出独立解决方案不太合适，所以我选择编辑他的回答 (David，如果觉得不好，可以随时回滚)。我采纳了 David 的回答，并将命令添加\vfill到他的宏的开头\AtEndDocument。它处理了讨论的几个用例，包括 David 的原始解决方案不足的用例。

\documentclass{article}
\usepackage[a6paper,margin=0.5cm,landscape]{geometry}
\usepackage{graphicx}
\usepackage{blindtext}
\pagestyle{empty}
\AtEndDocument{\vfill\enlargethispage{-2.5cm}\thispagestyle{credits}}
\makeatletter
\def\ps@credits{%
\def\@oddfoot{\hfill
        \smash{\includegraphics[draft,width=\linewidth,height=2cm]{documentfooter.pdf}}%
        \hfill}}

\makeatother

\begin{document}
    \raggedbottom
    \blindtext\footnote{A footnote.}
    % uncomment to move float to the next page
    \blindtext



\end{document} 

Answer 2

以下（有点复杂的方法）似乎涵盖了所有情况：

\documentclass{article}

% packages needed only for the purpose of illustration
\usepackage[a6paper,margin=0.5cm,bottom=1.5cm,landscape]{geometry}
\usepackage{graphicx}
\usepackage[english]{babel}
\usepackage{blindtext}

% packages which are actually used for putting the credits box at the right place
\usepackage{calc}
\usepackage{scrextend}
\usepackage[absolute]{textpos}
\usepackage{needspace}
\usepackage{etoolbox}

% patch the \Needspace command: not only end the current page in case of
% insufficient space but always create an empty new one 
\makeatletter
\patchcmd{\@needsp@}{\break}{\break\null}{\typeout{good}}{\typeout{bad}}
\makeatother

\AtEndDocument{%
    % put the credits into a box
    \newsavebox{\credits}%
    \sbox{\credits}{\includegraphics[draft,width=\linewidth,height=2cm]{documentfooter.pdf}}%
    %
    % measure its total height
    \newlength{\creditstotalheight}%
    \settototalheight{\creditstotalheight}{\usebox{\credits}}%
    %
    % check if there is enough space on the current page
    % otherwise insert a page break
    \Needspace{\creditstotalheight}%
    %
    % reduce the size of the current page by the total height of the credits box
    % this is needed since \Needspace doesn't recognize footnotes
    % (they would overlay with the credits box)
    \enlargethispage{-\creditstotalheight}%
    %
    % calculate the upper left corner of the credits block
    % within the text area
    \newlength{\creditsx}%
    \newlength{\creditsy}%
    \ifthispageodd{%
        \setlength{\creditsx}{\dimexpr 1in+\hoffset+\oddsidemargin \relax}%
    }{%
        \setlength{\creditsx}{\dimexpr 1in+\hoffset+\evensidemargin \relax}%
    }%
    \setlength{\creditsy}{\dimexpr 1in+\voffset+\topmargin+\headsep+\headheight
        +\textheight-\creditstotalheight \relax}%
    %
    % typeset the credits at the computed position
    \begin{textblock*}{\widthof{\usebox{\credits}}}(\creditsx,\creditsy)%
        \noindent\usebox{\credits}%
    \end{textblock*}%
    \pagebreak% issue a page break to bring the \raggedbottom into effect on this page
}

\begin{document}
    \pagebreak
    \thispagestyle{plain}
    \raggedbottom
    \blindtext\footnote{A footnote.}
    % uncomment to get a two page output
    %\blindtext[2]
\end{document}

结果如果text+credits < 1 page：

结果如果text+credits > 1 page：