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% chngpage.sty
% Provides commands to change the page layout in the middle of a document,
% and to robustly check for typesetting on odd or even pages.
% Instructions for use are at the end of this file.
% author: Peter Wilson (CUA)
% (now at
% Copyright 2000
% Released under the Latex Project Public License
\ProvidesPackage{chngpage}[2001/01/31 v1.1b change page layout]
%% Note: internal package commands all include the string `cp@'
%% new \if for the strict option
%% Declare and process options
%% new commands for getting a page number from a label (see ltxref.dtx)
0% in case no label in the *.aux file (page number made = 0)
\expandafter\cp@setref\csname r@#1\endcsname\@secondoftwo{#1}}
%% User level command to check for odd/even page
%% copy of some of the code from the ifmtarg package to save requiring ifmtarg
%% set the page output parameters
\advance\columnwidth-\columnsep \divide\columnwidth\tw@%
\ifx\@empty #1\relax \else
\ifcpoddpage\else % even numbered page
% Usage:
% ------
% \changetext
% The \changetext command is for changing the size and horizontal position
% of the text block on a page. The command takes 5 arguments, each of which
% is a length or is empty. i.e.,
% \changetext{textheight}{textwidth}{evensidemargin}{oddsidemargin}{columnsep}
% The given lengths are added to the corresponding current lengths and
% the remainder of the current page is typeset using the changed text block
% layout. The new layout remains in effect until another \change... command
% is issued.
% \changepage
% The \changepage command is for changing the general layout of
% a page. The command takes 9 arguments, each of which is a length or is empty.
% The first 5 arguments are the same as for \changetext and have the same effect.
% The last four arguments are:
% \changepage{5 args}{topmargin}{headheight}{headsep}{footskip}
% These lengths are added to the corresponding current lengths and
% thus modify the vertical positions of the elements of the page. The
% remainder of the current page is typeset using the changed text block
% and page layout. The new layout remains in effect until another
% \change... command is issued.
% NOTE 1: Not supplying a value for a length argument is equivalent
% to giving it a zero length value.
% NOTE 2: For any given page, everything is constant except for the textwidth
% and columnsep (for example, what is the meaning of two
% topmargins on a single column page?).
% It is therefore best to change anything else at the
% start of a new page. Further, any changes only apply to whole
% paragraphs. If you want an odd shaped paragraph use either
% the hanging package or the TeX \parshape command.
% For example, to change from single column pages to double column
% pages where the text block is both shorter and wider, then to revert
% back to the initial layout:
% ... single column normal page
% \newpage % or \clearpage
% \changetext{-5\baselineskip}{10em}{-5em}{-5em}{}
% \twocolumn
% ... two column pages
% \clearpage
% \changetext{5\baselineskip}{-10em}{5em}{5em}{}
% \onecolumn
% ... normal pages
% Note the adjustments to the margins which will keep the vertical centerline
% of the textblock at the same position on the page.
% As another example, to increase the width of a single paragraph:
% \changetext{0pt}{5em}{}{}{}%
% Start of wider paragraph text ...
% ... end of paragraph.
% \changetext{0pt}{-5em}{}{}{}
% Start of a normal paragraph ...
% Under some circumstances you can include a \change... command as part of
% the argument to \afterpage (from the afterpage package) and it may work.
% Similarly it may work in a heading style used for \thispagestyle to change
% a single page.
% adjustwidth
% Within an adjustwidth environment the left and right margins can be
% adjusted. The environment takes one optional argument and two required
% length arguments:
% \begin{adjustwidth}[]{leftmargin}{rightmargin}
% A positive length value will increase the relevant margin (shortening
% the text lines) while a negative length value will decrease the margin
% (lengthening text lines). An empty length argument means no change
% to the margin. At the end of the environment the margins revert to
% their original values.
% For example, to extend the text into the right margin:
% \begin{adjustwidth}{}{-8em}
% Any appearance of the optional argument (even just []) will cause
% the values of the margins to switch between odd and even pages.
% If the document is being set twosided it might be advantageous
% to have any wider text extending into the outside margin. This
% could be done via the optional argument, as:
% \begin{adjustwidth}[]{}{-8em}
% To have the adjusted text horizontally centered with respect to
% any surrounding text, the margins should be adjusted equally:
% \begin{adjustwidth}{-4em}{-4em}
% For interest, \begin{quotation} is pretty much equivalent
% to \begin{adjustwidth}{2.5em}{2.5em}
% The environment may also be used inside a float if the contents are
% a bit too wide for the text block, but can still fit within the physical
% page:
% \begin{figure}
% \begin{adjustwidth}{-2em}{-2em}
% \includegraphics{wide}
% \caption{Wide figure}
% \end{adjustwidth}
% \end{figure}
% Sometimes, because of the asynchronous nature of the TeX output
% routine, the margin switching may be incorrect (like \marginpar sometimes)
% near the top of a page. This can be corrected by using the package
% option `strict' (i.e., \usepackage[strict]{chngpage}), which causes
% adjustwidth to use the \checkoddpage command (see below).
% A disadvantage of the strict option is that the package generates
% a new label for each adjustwidth environment, and TeX may run out
% of space if there are an excessive number of labels in the document.
% Whether or not the strict option is used, `strict adjustwidths'
% can be turned on by putting the command \cpstricttrue before
% the environment, and turned of by using \cpstrictfalse.
% NOTE: In a twocolumn document, the adjustwidth environment
% treats both columns equally. For example, if the width is meant
% to be wider at the outer margin, then on odd pages the extra width
% will be at the right of any column, and on even pages the extra
% will be at the left of any column. You can get interesting effects
% by careful hand tuning on two column pages.
% \checkoddpage
% The \checkoddpage command can be used anywhere in the body of
% a document to determine if TeX is typesetting on an odd or
% even numbered page. If on an odd page then \ifcpoddpage is
% set TRUE, otherwise (on an even page) \ifcpoddpage is set
% This works by the \checkoddpage command generating a label and
% then checking the \pageref for the label (actually, a special version
% of \pageref is required and is used internally by \checkoddpage).
% This mechanism requires at least two LaTeX passes to ensure that
% the labels have settled (on the initial pass there will be no labels
% in the *.aux file to be checked).
% The label identifier is composed of the command \cplabelprefix
% and an automatically generated number. \cplabelprefix, initially
% defined as `^_', can be changed in the preamble if it will cause
% a clash with any author-defined labels. The default labels will
% be of the form `^_N' where N is a positive integer.
% Changes in version 1.1b (2001/01/31)
% ----------------------
% o Added strict option for robust adjustwidth; checks odd/even
% pages via labels instead of by the page counter.
% Changes in version 1.1a (2001/01/18)
% ----------------------
% o Added missing {} in last 4 arguments of \changepage
% Changes in version 1.1 (2000/07/22)
% ----------------------
% o Empty arguments made available
% o Added adjustwidth environment
% Peter W.
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