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+% EPSF.TEX macro file:
+% Written by Tomas Rokicki of Radical Eye Software, 29 Mar 1989.
+% Revised by Don Knuth, 3 Jan 1990.
+% Revised by Tomas Rokicki to accept bounding boxes with no
+% space after the colon, 18 Jul 1990.
+%
+% TeX macros to include an Encapsulated PostScript graphic.
+% Works by finding the bounding box comment,
+% calculating the correct scale values, and inserting a vbox
+% of the appropriate size at the current position in the TeX document.
+%
+% To use with the center environment of LaTeX, preface the \epsffile
+% call with a \leavevmode. (LaTeX should probably supply this itself
+% for the center environment.)
+%
+% To use, simply say
+% \input epsf % somewhere early on in your TeX file
+% \epsfbox{filename.ps} % where you want to insert a vbox for a figure
+%
+% Alternatively, you can type
+%
+% \epsfbox[0 0 30 50]{filename.ps} % to supply your own BB
+%
+% which will not read in the file, and will instead use the bounding
+% box you specify.
+%
+% The effect will be to typeset the figure as a TeX box, at the
+% point of your \epsfbox command. By default, the graphic will have its
+% `natural' width (namely the width of its bounding box, as described
+% in filename.ps). The TeX box will have depth zero.
+%
+% You can enlarge or reduce the figure by saying
+% \epsfxsize=<dimen> \epsfbox{filename.ps}
+% (or
+% \epsfysize=<dimen> \epsfbox{filename.ps})
+% instead. Then the width of the TeX box will be \epsfxsize and its
+% height will be scaled proportionately (or the height will be
+% \epsfysize and its width will be scaled proportiontally). The
+% width (and height) is restored to zero after each use.
+%
+% A more general facility for sizing is available by defining the
+% \epsfsize macro. Normally you can redefine this macro
+% to do almost anything. The first parameter is the natural x size of
+% the PostScript graphic, the second parameter is the natural y size
+% of the PostScript graphic. It must return the xsize to use, or 0 if
+% natural scaling is to be used. Common uses include:
+%
+% \epsfxsize % just leave the old value alone
+% 0pt % use the natural sizes
+% #1 % use the natural sizes
+% \hsize % scale to full width
+% 0.5#1 % scale to 50% of natural size
+% \ifnum#1>\hsize\hsize\else#1\fi % smaller of natural, hsize
+%
+% If you want TeX to report the size of the figure (as a message
+% on your terminal when it processes each figure), say `\epsfverbosetrue'.
+%
+\newread\epsffilein % file to \read
+\newif\ifepsffileok % continue looking for the bounding box?
+\newif\ifepsfbbfound % success?
+\newif\ifepsfverbose % report what you're making?
+\newdimen\epsfxsize % horizontal size after scaling
+\newdimen\epsfysize % vertical size after scaling
+\newdimen\epsftsize % horizontal size before scaling
+\newdimen\epsfrsize % vertical size before scaling
+\newdimen\epsftmp % register for arithmetic manipulation
+\newdimen\pspoints % conversion factor
+%
+\pspoints=1bp % Adobe points are `big'
+\epsfxsize=0pt % Default value, means `use natural size'
+\epsfysize=0pt % ditto
+%
+\def\epsfbox#1{\global\def\epsfllx{72}\global\def\epsflly{72}%
+ \global\def\epsfurx{540}\global\def\epsfury{720}%
+ \def\lbracket{[}\def\testit{#1}\ifx\testit\lbracket
+ \let\next=\epsfgetlitbb\else\let\next=\epsfnormal\fi\next{#1}}%
+%
+\def\epsfgetlitbb#1#2 #3 #4 #5]#6{\epsfgrab #2 #3 #4 #5 .\\%
+ \epsfsetgraph{#6}}%
+%
+\def\epsfnormal#1{\epsfgetbb{#1}\epsfsetgraph{#1}}%
+%
+\def\epsfgetbb#1{%
+%
+% The first thing we need to do is to open the
+% PostScript file, if possible.
+%
+\openin\epsffilein=#1
+\ifeof\epsffilein\errmessage{I couldn't open #1, will ignore it}\else
+%
+% Okay, we got it. Now we'll scan lines until we find one that doesn't
+% start with %. We're looking for the bounding box comment.
+%
+ {\epsffileoktrue \chardef\other=12
+ \def\do##1{\catcode`##1=\other}\dospecials \catcode`\ =10
+ \loop
+ \read\epsffilein to \epsffileline
+ \ifeof\epsffilein\epsffileokfalse\else
+%
+% We check to see if the first character is a % sign;
+% if not, we stop reading (unless the line was entirely blank);
+% if so, we look further and stop only if the line begins with
+% `%%BoundingBox:'.
+%
+ \expandafter\epsfaux\epsffileline:. \\%
+ \fi
+ \ifepsffileok\repeat
+ \ifepsfbbfound\else
+ \ifepsfverbose\message{No bounding box comment in #1; using defaults}\fi\fi
+ }\closein\epsffilein\fi}%
+%
+% Now we have to calculate the scale and offset values to use.
+% First we compute the natural sizes.
+%
+\def\epsfsetgraph#1{%
+ \epsfrsize=\epsfury\pspoints
+ \advance\epsfrsize by-\epsflly\pspoints
+ \epsftsize=\epsfurx\pspoints
+ \advance\epsftsize by-\epsfllx\pspoints
+%
+% If `epsfxsize' is 0, we default to the natural size of the picture.
+% Otherwise we scale the graph to be \epsfxsize wide.
+%
+ \epsfxsize\epsfsize\epsftsize\epsfrsize
+ \ifnum\epsfxsize=0 \ifnum\epsfysize=0
+ \epsfxsize=\epsftsize \epsfysize=\epsfrsize
+%
+% We have a sticky problem here: TeX doesn't do floating point arithmetic!
+% Our goal is to compute y = rx/t. The following loop does this reasonably
+% fast, with an error of at most about 16 sp (about 1/4000 pt).
+%
+ \else\epsftmp=\epsftsize \divide\epsftmp\epsfrsize
+ \epsfxsize=\epsfysize \multiply\epsfxsize\epsftmp
+ \multiply\epsftmp\epsfrsize \advance\epsftsize-\epsftmp
+ \epsftmp=\epsfysize
+ \loop \advance\epsftsize\epsftsize \divide\epsftmp 2
+ \ifnum\epsftmp>0
+ \ifnum\epsftsize<\epsfrsize\else
+ \advance\epsftsize-\epsfrsize \advance\epsfxsize\epsftmp \fi
+ \repeat
+ \fi
+ \else\epsftmp=\epsfrsize \divide\epsftmp\epsftsize
+ \epsfysize=\epsfxsize \multiply\epsfysize\epsftmp
+ \multiply\epsftmp\epsftsize \advance\epsfrsize-\epsftmp
+ \epsftmp=\epsfxsize
+ \loop \advance\epsfrsize\epsfrsize \divide\epsftmp 2
+ \ifnum\epsftmp>0
+ \ifnum\epsfrsize<\epsftsize\else
+ \advance\epsfrsize-\epsftsize \advance\epsfysize\epsftmp \fi
+ \repeat
+ \fi
+%
+% Finally, we make the vbox and stick in a \special that dvips can parse.
+%
+ \ifepsfverbose\message{#1: width=\the\epsfxsize, height=\the\epsfysize}\fi
+ \epsftmp=10\epsfxsize \divide\epsftmp\pspoints
+ \vbox to\epsfysize{\vfil\hbox to\epsfxsize{%
+ \special{PSfile=#1 llx=\epsfllx\space lly=\epsflly\space
+ urx=\epsfurx\space ury=\epsfury\space rwi=\number\epsftmp}%
+ \hfil}}%
+\epsfxsize=0pt\epsfysize=0pt}%
+
+%
+% We still need to define the tricky \epsfaux macro. This requires
+% a couple of magic constants for comparison purposes.
+%
+{\catcode`\%=12 \global\let\epsfpercent=%\global\def\epsfbblit{%BoundingBox}}%
+%
+% So we're ready to check for `%BoundingBox:' and to grab the
+% values if they are found.
+%
+\long\def\epsfaux#1#2:#3\\{\ifx#1\epsfpercent
+ \def\testit{#2}\ifx\testit\epsfbblit
+ \epsfgrab #3 . . . \\%
+ \epsffileokfalse
+ \global\epsfbbfoundtrue
+ \fi\else\ifx#1\par\else\epsffileokfalse\fi\fi}%
+%
+% Here we grab the values and stuff them in the appropriate definitions.
+%
+\def\epsfgrab #1 #2 #3 #4 #5\\{%
+ \global\def\epsfllx{#1}\ifx\epsfllx\empty
+ \epsfgrab #2 #3 #4 #5 .\\\else
+ \global\def\epsflly{#2}%
+ \global\def\epsfurx{#3}\global\def\epsfury{#4}\fi}%
+%
+% We default the epsfsize macro.
+%
+\def\epsfsize#1#2{\epsfxsize}
+%
+% Finally, another definition for compatibility with older macros.
+%
+\let\epsffile=\epsfbox