/usr/share/texlive/texmf-dist/tex/generic/midnight/border.tex is in texlive-generic-extra 2013.20140215-2.
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%
% border.tex: Macros to typeset borders.
% version: 1.0 release: 21 October 1991
%
% copyright (c) 1991 Marcel R. van der Goot
% You can use these macros to typeset documents. You may
% distribute this file freely, provided that you also distribute
% the accompanying documentation.
% You may make changes to this file, or extract portions
% of it for inclusion in other files, provided that
% (1) you change the name of the file;
% (2) you give proper credit and include copyright
% information where applicable;
% (3) explain how an unchanged version can be obtained; and
% (4) document the usage of your macros/changes (if usage
% of your macros is not worth documenting, they must not
% be worth using).
% You are not allowed to use the name ``Midnight Macros'' for
% any changed files.
% The above rules for making changes do not apply where it
% is explicitly noted in this file that something can be changed
% to conform to your local installation.
%
% USAGE:
% See the file border.doc
%
% original: csvax.cs.caltech.edu [131.215.131.131] in pub/tex
% (use anonymous ftp). Also in various archives.
%
% Caltech, Pasadena --- Marcel van der Goot
% marcel@cs.caltech.edu
% Caltech 256--80
% Pasadena, CA 91125
% USA
% (818) 356--4603
%
% update history:
% version 1.0: This one.
% release 21 Oct 1991: The original
%
%%%%%% CODE: (you don't need to read this to use the macros)
\edef\borderelm{\the\catcode`\_} % minor trick to remember the catcode
\catcode`\_=11% letter, to make private macros
% Note: we use \box0, \box2, \box4, \dimen0, \dimen2, and \count2, rather than
% allocating new boxes, dimensions, and counts. That is usually ok because all
% assignments are done within \hbox{...} or \vbox{...}, which provides
% grouping.
%%%%%%% exactly fitting border with overlaps
% \border makes a border of the specified dimensions, by overlapping some
% of the elements when necessary.
% \hborder takes four arguments, the width, and the indices of the left
% element, the middle element, and the right element. It makes an horizontal
% border of the form \hbox to wd{ l m+ r }, where there is at least one m.
% If wd is large enough to set at least {l m r}, all overlap is between
% elements of type m. In the unusual case where wd is too small, the overlap
% is necessarily with the corner elements.
\def\hborder#1#2#3#4% wd, l, m, r
{\hbox to#1
{\setbox0=\hbox{\borderelm#3}%
\borderelm#2%
\hskip0pt minus1fil %
\copy0\kern-.5\wd0 %
\cleaders\copy0\hskip0pt plus1fil %
\kern-.5\wd0\copy0 %
\hskip0pt minus1fil %
\borderelm#4%
}%
}
% \border does the vertical equivalent of \hborder: the top and bottom
% elements are hboxes generated with \hborder, and the middle element is
% an \hbox{ l \hss r }. This middle element is again used at least once,
% and if possible all overlap will be among middle elements.
% The \kern0sp at the end is to get depth 0, rather than the depth of
% the last hbox. (\boxmaxdepth is set to the largest possible value to make
% sure that the depth is indeed 0, not negative.)
\def\border#1#2% ht, wd
{\vbox to#1
{\offinterlineskip\boxmaxdepth=\maxdimen
\dimen2=#2
\setbox0=\hbox to\dimen2{\borderelm3\hss\borderelm4}
\dimen0=\ht0 \advance\dimen0 by\dp0
\hborder{\dimen2}012
\vskip0pt minus1fil
\copy0\kern-.5\dimen0
\cleaders\copy0\vskip0pt plus1fil
\kern-.5\dimen0\copy0
\vskip0pt minus1fil
\hborder{\dimen2}567
\kern0sp
}%
}
%%%%%%% exactly fitting border with spaces
% \xborder also makes a border of the specified dimensions, but rather than
% overlapping elements, it leaves space between the elements.
% \xhborder makes a horizontal border. Unlike \hborder, there are zero (not
% one) or more middle elements. The extra space is equally distributed
% between all the elements.
\def\hxborder#1#2#3#4% wd, l, m, r
{\hbox to#1
{\setbox0=\hbox{\borderelm#3}%
\borderelm#2%
\xleaders\copy0\hskip0pt plus1fil minus1fil %
\borderelm#4%
}%
}
% \xborder is to \hxborder as \border is to \hborder.
\def\xborder#1#2% ht, wd
{\vbox to#1
{\offinterlineskip\boxmaxdepth=\maxdimen
\dimen2=#2
\setbox0=\hbox to\dimen2{\borderelm3\hss\borderelm4}
\hxborder{\diemn2}012
\xleaders\copy0\vskip0pt plus1fil minus1fil
\hxborder{\dimen2}567
\kern0sp
}%
}
%%%%%%% rounded border with abutting elements
% \plusborder and \minusborder make borders with abutted elements (no
% overlaps, no spaces). To make this possible, the border dimensions are
% rounded so that an integral number of elements fits. \plusborder rounds
% up, \minusborder rounds down. \plusgray and \minusgray are similiar, except
% that \borderelm8 is used as center element (normally the center is white).
% \plus_border and \minus_border are used for both, where the 3rd argument
% indicates whether there is a center element.
% The computation consists of determining the space D that has to be
% filled with middle elements. If the width of the middle element is d,
% there fit (D div d) middle element in a `minus border.'
% To avoid minor inaccuracies in the arithmetic, what we actually do is
% (D+100sp) div d. 100sp is so small as to be invisible.
\def\hminusborder#1#2#3#4% wd, l, m, r
{\hbox
{\dimen0=#1\count2=\dimen0 %
\setbox0=\hbox{\borderelm#2}\advance\count2 by-\wd0 %
\setbox0=\hbox{\borderelm#4}\advance\count2 by-\wd0 %
\setbox0=\hbox{\borderelm#3}%
\advance\count2 by100 %
\divide\count2 by\wd0 %
\borderelm#2%
\cleaders\copy0\hskip\count2\wd0 %
\borderelm#4%
}%
}
\def\minus_border#1#2#3% ht, wd, #3=empty ==> no center element
{\vbox
{\offinterlineskip\boxmaxdepth=\maxdimen
\dimen2=#2\relax
\dimen0=#1\count2=\dimen0
\setbox0=\hminusborder{\dimen2}012
\advance\count2 by-\ht0 \advance\count2 by-\dp0
\setbox2=\hminusborder{\dimen2}567
\advance\count2 by-\ht2 \advance\count2 by-\dp2
\if.#3.\setbox4=\hbox to\wd0{\borderelm3\hss\borderelm4}
\else \setbox4=\hminusborder{\dimen2}384
\fi
\advance\count2 by100
\dimen0=\ht4\advance\dimen0 by\dp4
\divide\count2 by\dimen0
\box0
\cleaders\copy4\vskip\count2\dimen0
\box2
\kern0sp
}%
}
\def\minusborder#1#2{\minus_border{#1}{#2}{}}
\def\minusgray#1#2{\minus_border{#1}{#2}{1}}
% Rounding upwards is achieved with (D + d - 1) div d, but again, we
% actually do (D + d - 100sp) div d.
\def\hplusborder#1#2#3#4% wd, l, m, r
{\hbox
{\dimen0=#1\count2=\dimen0 %
\setbox0=\hbox{\borderelm#2}\advance\count2 by-\wd0 %
\setbox0=\hbox{\borderelm#4}\advance\count2 by-\wd0 %
\setbox0=\hbox{\borderelm#3}%
\advance\count2 by\wd0\advance\count2 by-100 %
\divide\count2 by\wd0 %
\borderelm#2%
\cleaders\copy0\hskip\count2\wd0 %
\borderelm#4%
}%
}
\def\plus_border#1#2#3% ht, wd, #3=empty ==> no center element
{\vbox
{\offinterlineskip\boxmaxdepth=\maxdimen
\dimen2=#2\relax
\dimen0=#1\relax\count2=\dimen0
\setbox0=\hplusborder{\dimen2}012
\advance\count2 by-\ht0 \advance\count2 by-\dp0
\setbox2=\hplusborder{\dimen2}567
\advance\count2 by-\ht2 \advance\count2 by-\dp2
\if.#3.\setbox4=\hbox to\wd0{\borderelm3\hss\borderelm4}
\else\setbox4=\hplusborder{\dimen2}384
\fi
\dimen0=\ht4\advance\dimen0 by\dp4
\advance\count2 by\dimen0\advance\count2 by-100
\divide\count2 by\dimen0
\box0
\cleaders\copy4\vskip\count2\dimen0
\box2
\kern0sp
}%
}
\def\plusborder#1#2{\plus_border{#1}{#2}{}}
\def\plusgray#1#2{\plus_border{#1}{#2}{1}}
%%%%%%% border example (rounded corners)
% This example creates a border with rounded corners. The corners are taken
% from the manfnt font, as described in The TeXbook, p.389. However, we
% reposition them in their boxes, as their original position is inconvenient:
% We want tight-fitting boxes, because the boxes determine the border width
% and height. The original position is described in The TeXbook.
% If \manfnt is already defined, we do not redefine it.
\ifx\manfnt\UNDEFINED
\font\manfnt=manfnt
\fi
% \roundcorners is a bit messy, but that is not so important.
% Just so that you can use \minusgray and \plusgray, we added a center
% character (just some random character from the font). That meant that the
% left and right character had to be given widths equal to the corner elements.
% \roundcorners scales properly with \manfnt.
\def\roundcorners#1% use as \borderelm
{{\manfnt
\setbox2=\hbox{\char'44}% for demonstration purposes
\ifcase#1
\setbox0=\hbox{d}% lu
\hbox to\ht0{\vbox to\fontdimen8\font{\vss\box0}\hss}%
\or\hbox{\vrule width\wd2 height\fontdimen8\font depth0pt\hss}% u=d
\or\setbox0=\hbox{a}% ru
\hbox to\ht0{\kern\dp0\vbox to\fontdimen8\font{\vss\box0}\hss}%
\or\setbox0=\hbox{d}%
\hbox to\ht0{\vrule width\fontdimen8\font height\ht2 depth\dp2\hss}% l
\or\setbox0=\hbox{d}%
\hbox to\ht0{\hss\vrule width\fontdimen8\font height\ht2 depth\dp2}% r
\or\setbox0=\hbox{c}% ld
\hbox to\ht0{\vbox{\copy0\kern-\dp0}\hss}%
\or\hbox{\vrule width\wd2 height\fontdimen8\font depth0pt\hss}% d=u
\or\setbox0=\hbox{b}% rd
\hbox to\ht0{\kern\dp0\vbox{\copy0\kern-\dp0}\hss}%
\or\box2 % center character
\fi
}}
%%%%%%% centering text within a border
% \setborder[bwd, hspace, vspace]\bordermacro uses \bordermacro (one of
% \border, \xborder, etc.) to typeset a border. The width of the border is bwd,
% the height of the border depends on the amount of text within the border.
% This text is read and typeset in a vbox, with the hsize set so that the
% width has the appropriate value. This is done in a somewhat convoluted way
% with \afterassignment to set the hsize, and \aftergroup to create the border.
% The reason is that now the text is not read as an argument of \setborder,
% which is important, for instance, if the text contains catcode changes.
% We did not write \setborder[#1,#2,#3]#4#{ , which would have ensured that a
% brace follows: that would have required an explicit brace, whereas now you
% can also use \bgroup (useful if you want to put \setborder in some other
% macro).
\newbox\brd_txt
\newbox\brd_box
\def\setborder[#1,#2,#3]#4% wd, hspace, vspace, bordermacro
{\def\brd_inbox
{\hsize=#1
\advance\hsize by-#2
\advance\hsize by-#2
\aftergroup\set_border
}%
\def\set_border
{\setbox\brd_txt=\vbox
{\vskip#3
\box\brd_txt
\vskip#3
}%
\setbox\brd_box=#4{\ht\brd_txt}{#1}%
\vbox to\ht\brd_box
{\copy\brd_box \kern-\ht\brd_box
\vss
\hbox to\wd\brd_box{\hss\box\brd_txt\hss}
\vss
}%
}%
\afterassignment\brd_inbox
\setbox\brd_txt=\vbox
}
%%%%%%% initialization
\catcode`\_=\borderelm % restore catcode
\let\borderelm=\roundcorners % only reasonable initialization
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