% 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 9.2.1, p. I-314.
% Original source in file "boxit.TEX", starting line 79.
\wlog{L: "graphmac.tip" ["boxit.TEX," l. 79, p. I-314]}%
% This file DOES belong to format "texip."
\InputD{box-zero.tip}
\catcode`\@ = 11
\newdimen\@ScaleLength
\def\SetScale #1{%
   \@ScaleLength = #1
}
\SetScale{1mm}
\newdimen\@LineThickness
\def\SetLineThickness #1{%
   \@LineThickness = #1
}
\SetLineThickness{0.3mm}
\newbox\@GraphDataBox
\def\SetGraphDataBox #1{%
   \dimen0 = #1%
   \setbox\@GraphDataBox =
       \hbox{%
           \hskip -0.5\dimen0
           \vrule height 0.5\dimen0
                  depth  0.5\dimen0
                  width  1.0\dimen0
       }%
   \ZeroBox{\@GraphDataBox}%
}
\SetGraphDataBox{2mm}
\def\DrawDataBox (#1,#2){%
   {%
       \setbox0 = \hbox{%
           \hskip #1\@ScaleLength
           \raise #2\@ScaleLength\copy\@GraphDataBox
       }%
       \ZeroBoxOut{0}%
   }%
}
\def\DrawHLine (#1,#2)#3{%
   {%
       \setbox0 = \hbox{%
           \hskip #1\@ScaleLength
           \raise #2\@ScaleLength
               \hbox{%
                   \vrule height 0.5\@LineThickness
                          depth  0.5\@LineThickness
                          width  #3\@ScaleLength
               }%
       }%
       \ZeroBoxOut{0}%
   }%
}
\def\DrawVLine (#1,#2)#3{%
   {%
       \setbox0 = \hbox{%
           \hskip #1\@ScaleLength
           \hskip -0.5\@LineThickness
           \raise #2\@ScaleLength
               \hbox{%
                   \vrule height #3\@ScaleLength
                          depth  0pt
                          width  \@LineThickness
               }%
       }%
       \ZeroBoxOut{0}%
   }%
}
\catcode`\@ = 12

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