KTUGFaq: Chngpage Package

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ChngpagePackage (rev. 1.3)

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Chngpage Package

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changepage 명령은 쪽 레이아웃을 바꾸는 데 사용한다. 이 명령은 아홉 개의 인자를 가지는데 각각 길이값을 주거나 비워둔다. 처음의 다섯 개의 인자는 \changetext 명령의 인자와 그 의미가 같다. 나머지 네 개의 인자는 다음과 같다.

\changepage{5 args}{topmargin}{headheight}{headsep}{footskip}

이 길이값들은 해당하는 값에 더해진다. 따라서 페이지 상의 텍스트 영역의 세로 위치를 변경할 수 있다. 현재 페이지부터 효과가 발생하고 새로운 \change... 명령이 나올 때까지 유효하다.

$/!\$ NOTE: 이 명령은 페이지 전체의 모든 문단에 영향을 끼친다. 몇 문단만 레이아웃을 바꾸려 한다면 차라리 hanging 패키지나 PlainTeX의 \parshape 명령을 고려해보는 것이 좋을 것이다.

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3 Examples ¶

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.

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4 adjustwidth 환경 ¶

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., \usepackagestrict{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.

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5 `\checkoddpage` 명령 ¶

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 FALSE.

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.

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