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