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% XEPSF.TEX macro file:
% Same as EPSF.TEX except that it uses the ExactBoundingBox put out by
% MetaPost under appropriate coding.
%
% (I made this unnecessary on 22 Jan 97 by changing MetaPost to
% output the exact bounding box when prologues<0. But I retain this
% file for compatibility with older uses of MetaPost, e.g. gbmac.tex.)
%
% 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
% `%%%ExactBoundingBox:'.
%
\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\epsfclipstring{}% do we clip or not? If so,
\def\epsfclipon{\def\epsfclipstring{ clip}}%
\def\epsfclipoff{\def\epsfclipstring{}}%
%
\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
\epsfrsize=0pt
%
% 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
\epsfrsize=0pt
\fi
\else \ifnum\epsfysize=0
\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
\epsfrsize=0pt
\else
\epsfrsize=\epsfysize
\fi
\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{%
\ifnum\epsfrsize=0\relax
\special{PSfile=#1 llx=\epsfllx\space lly=\epsflly\space
urx=\epsfurx\space ury=\epsfury\space rwi=\number\epsftmp
\epsfclipstring}%
\else
\epsfrsize=10\epsfysize \divide\epsfrsize\pspoints
\special{PSfile=#1 llx=\epsfllx\space lly=\epsflly\space
urx=\epsfurx\space ury=\epsfury\space rwi=\number\epsftmp\space
rhi=\number\epsfrsize \epsfclipstring}%
\fi
\hfil}}%
\global\epsfxsize=0pt\global\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{%%ExactBoundingBox}}%
%
% So we're ready to check for `%%ExactBoundingBox:' 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\epsfempty{}%
\def\epsfgrab #1 #2 #3 #4 #5\\{%
\global\def\epsfllx{#1}\ifx\epsfllx\epsfempty
\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
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