我的文档中的大多数页面看起来都像这样，这是书籍中常见的布局：
___________________________
| | |
| Title | ........... |
| | ........... |
| .......... | ........... |
| ........... | ........... |
| ........... | ........... |
| ........... | ........... |
| ........... | ........... |
| ........... | ........... |
| 1 | 2 |
|_____________|_____________|
我有一些特殊的页面，希望其中的内容能够跨越左页和右页。
- 该论文基本上被视为一张宽的 A3 纸，只是页码保持不变。
- 页边距与上面的相同，但是书的折叠处没有页边距。
- 甚至章节和部分标题也应该跨越。
书中的大多数页面并不以这种方式跨越。
___________________________
| | |
| The Title Goes Across Too |
| | |
| ........................ |
| ......................... |
| ......................... |
| ......................... |
| ......................... |
| ......................... |
| 1 | 2 |
|_____________|_____________|
我怎样才能以这种方式将某些页面的内容跨越两页？
答案1
如果您的两页跨页没有浮动，那么您可以简单地将内容存储在一个框中，然后将该框分成两部分。
% The default layout
\setuplayout[cutspace=1in, backspace=1in, width=middle]
% The layout for left and right page. ConTeXt treats cutspace=0pt as a signal
% to set cutspace=backspace. So, I use cutspace=1sp (the smallest non-zero
% space in TeX.
\definelayout[leftpage] [cutspace=1sp, backspace=1in, width=middle]
\definelayout[rightpage][cutspace=1in, backspace=1sp, width=middle]
% A box to store the content
\newbox\twopagebox
% A frame to typeset the content.
\defineframed
[twopageframe]
[
width=\the\dimexpr2\paperwidth-2\backspace,
height=\textheight,
align=normal,
frame=off,
]
% An environment to gather the data, typeset it in a box, and then split
% the box.
%
% A buffer is not needed here, as we can directly typeset the material in
% a box.
\unexpanded\def\starttwopagemakeup
{\grabbufferdata[twopagebuffer][starttwopagemakeup][stoptwopagemakeup]}
\unexpanded\def\stoptwopagemakeup
{\setbox\twopagebox\hbox{\twopageframe{\getbuffer[twopagebuffer]}}%
\page[right]%
\setuplayout[leftpage]%
\clip[nx=2, ny=1, x=1]{\copy\twopagebox}%
\page
\setuplayout[rightpage]%
\clip[nx=2, ny=1, x=2]{\copy\twopagebox}%
\page
\setuplayout[reset]}
\setupbackgrounds[page][frame=on, framecolor=red]
% To visualize the page border
\starttext
\dorecurse{6}{\input knuth \endgraf}
\starttwopagemakeup
\chapter {Two page data}
\dorecurse{6}{\input knuth \endgraf}
\stoptwopagemakeup
\dorecurse{6}{\input knuth \endgraf}
\stoptext
这使
笔记在将页面合并在一起以在此处显示图像时，我特意在页面之间留出了空间。
此解决方案仅适用于单页。如果您希望支持多页，则需要将内容存储为\vbox并保留，\vsplit直到没有剩余材料为止。例如，
% The default layout
\setuplayout[cutspace=1in, backspace=1in, width=middle]
% The layout for left and right page. ConTeXt treats cutspace=0pt as a signal
% to set cutspace=backspace. So, I use cutspace=1sp (the smallest non-zero
% space in TeX.
\definelayout[leftpage] [cutspace=1sp, backspace=1in, width=middle]
\definelayout[rightpage][cutspace=1in, backspace=1sp, width=middle]
% A box to store the content
\newbox\twopagebox
\newbox\contentbox
\unprotect
% An environment to gather the data, typeset it in a box, and then split
% the box.
\unexpanded\def\starttwopagemakeup
{\setbox\contentbox\vbox\bgroup
\hsize\the\dimexpr2\paperwidth-2\backspace\relax}
\unexpanded\def\stoptwopagemakeup
{\egroup
\typeset_all_pages}
\def\typeset_all_pages
{\ifvoid\contentbox
% Done
\else\ifdim\ht\contentbox>\textheight
\setbox\twopagebox\vsplit\contentbox to \textheight
\typeset_one_page\twopagebox
\typeset_all_pages
\else
\typeset_one_page\contentbox
\fi
\fi}
\def\typeset_one_page#1% box
{\page[right]%
\setuplayout[leftpage]%
\clip[nx=2, ny=1, x=1]{\copy#1}%
\page
\setuplayout[rightpage]%
\clip[nx=2, ny=1, x=2]{\copy#1}%
\page
\setuplayout[reset]}
\protect
\setupbackgrounds[page][frame=on, framecolor=red]
% To visualize the page border
\setuphead[chapter][page=] % Otherwise we get an extra page
\starttext
\starttwopagemakeup
\chapter{One}
\dorecurse{12}{\input knuth \relax}
\stoptwopagemakeup
\chapter{Normal Text}
\dorecurse{12}{\input ward \endgraf}
\stoptext
这使用低级 TeX（因为拆分页面实际上相当于编写输出例程）。有关详细信息，请参阅 TeX by Topic。