% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 9.3.4.3, p. I-324.
% Original source in file "boxit.TEX", starting line 555.
\wlog{L: "boxing4.tip" ["boxit.TEX," l. 555, p. I-324]}%
% This file DOES belong to format "texip."
\InputD{box-zero.tip}
\InputD{box-bul.tip}
\InputD{box-bb.tip}
\InputD{box-thck.tip}
\catcode`\@ = 11
\def\BoxingD #1{%
    \vbox{%
        \setbox\@BoxingBox = #1%
        \setbox\@BaseLineLeaders = \hbox to \wd\@BoxingBox{%
            \xleaders\hbox to 4pt{%
                \hskip 1pt
                \vrule depth 0.4pt height 0.4pt width 2pt
                \hfil
                }%
            \hfil
        }%
        \ZeroBox{\@BaseLineLeaders}% 
        \hrule height \BoxRuleThickness
        \hbox{%
            \vrule width \BoxRuleThickness
            \copy\@BulletBox
            \box\@BaseLineLeaders
            \box\@BoxingBox
            \vrule width \BoxRuleThickness
        }%
        \hrule height \BoxRuleThickness
    }%
}
\catcode`\@ = 12