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%D \module
%D [ file=spec-ps,
%D version=1996.01.25,
%D title=\CONTEXT\ Special Macros,
%D subtitle=Adobe PostScript,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D \macros
%D {dostartgraymode,dostopgraymode,
%D dostartrgbcolormode,dostartcmykcolormode,dostartgraycolormode,dostopcolormode,
%D dostartrotation,dostoprotation,
%D dostartscaling,dostopscaling,
%D dostartmirroring,dostopmirroring,
%D dostartnegative,dostopnegative,
%D dostartoverprint,dostopoverprint,
%D doselectfirstpaperbin,
%D doselectsecondpaperbin}
%D
%D This implementation is straightforward and can be used as
%D a default with postscript||drivers. We use \type{ps:} as
%D opening, because most drivers support this.
\startspecials[postscript]
\def\@@insertpostscriptliteral {ps: }
\def\@@insertpostscriptretain {" }
\definespecial\dostartgraymode#1%
{\special
{\@@insertpostscriptliteral
#1\space setgray}}
\definespecial\dostopgraymode
{\special
{\@@insertpostscriptliteral
0 setgray}}
\definespecial\dostartrgbcolormode#1#2#3%
{\special
{\@@insertpostscriptliteral
#1\space #2\space #3\space setrgbcolor}}
\definespecial\dostartcmykcolormode#1#2#3#4%
{\special
{\@@insertpostscriptliteral
#1\space #2\space #3\space #4\space setcmykcolor}}
\definespecial\dostartgraycolormode#1%
{\special
{\@@insertpostscriptliteral
#1\space setgray}}
\definespecial\dostopcolormode
{\special
{\@@insertpostscriptliteral
0 setgray}}
\definespecial\doselectfirstpaperbin
{\special
{\@@insertpostscriptliteral
statusdict begin 1 setpapertray end}} % checken
\definespecial\doselectsecondpaperbin
{\special
{\@@insertpostscriptliteral
statusdict begin 0 setpapertray end}} % checken
\definespecial\dostartrotation#1% straight from the YandY manual
{\special
{\@@insertpostscriptliteral
gsave currentpoint currentpoint translate
\number#1\space\space rotate neg exch neg exch translate}}
\definespecial\dostoprotation
{\special
{\@@insertpostscriptliteral
currentfont currentpoint grestore moveto setfont}}
\definespecial\dostartscaling#1#2% conforming the YandY manual
{\special
{\@@insertpostscriptliteral
gsave currentpoint currentpoint translate
#1\space #2\space scale neg exch neg exch translate}}
\definespecial\dostopscaling
{\special
{\@@insertpostscriptliteral
currentfont currentpoint grestore moveto setfont}}
\definespecial\dostartmirroring % some translate and exch stuff from YandY
{\special
{\@@insertpostscriptliteral
gsave currentpoint currentpoint translate
[-1 0 0 1 0 0] concat neg exch neg exch translate}}
\definespecial\dostopmirroring
{\special
{\@@insertpostscriptliteral
currentfont currentpoint grestore moveto setfont}}
\definespecial\dostartnegative
{\special{\@@insertpostscriptliteral gsave {1 exch sub} settransfer}}
\definespecial\dostopnegative
{\special{\@@insertpostscriptliteral grestore}}
\definespecial\dostartoverprint
{\special{\@@insertpostscriptliteral true setoverprint}}
\definespecial\dostopoverprint
{\special{\@@insertpostscriptliteral false setoverprint}}
\definespecial\dostartgraphicgroup
{\special{\@@insertpostscriptliteral gsave}}
\definespecial\dostopgraphicgroup
{\special{\@@insertpostscriptliteral grestore}}
%D \macros
%D {doovalbox}
%D
%D This implementation is a mixture of several possible
%D implementations. We use some constants that may not be
%D changed. It took some time to find them, but these values
%D offer quite accurate results. The macro calls for
%D \type{\forgetall}, which resets indentation, skips and
%D \type{\everypar}.
%D
%D Because a stroke follows the line, we correct for half of
%D the linewidth. Furthermore we use scaling to overcome some
%D limitations in the precision ($<1$~sp) and to prevent
%D rounding errors. We also do some correction for large
%D values. We let PostScript compare some arguments with
%D \type{a b eq {action} fi}.
%D
%D The path is based on a macro of J.~Hefferon cs. We also
%D tried the D.~Salomon implementation, but this did not work
%D well, just like some other alternatives.
% #1 = width #2 = height #3 = depth
% #4 = linewidth #5 = radius
% #5 = stroke (ja,nee) #7 = fill (ja,nee)
\def\@@insertpostscriptliteral {ps: }
\def\@@insertpostscriptretain {postscript } % unknown
\def\dosomeovalcalc#1#2#3%
{\dimen2=#1%
\advance\dimen2 #2%
\PointsToBigPoints{\dimen2}#3}
\def\dosomeovalbox#1#2#3#4#5#6#7#8% variant not yet supported
{\bgroup
\dimen0=#4\divide\dimen0 2
\dosomeovalcalc{0pt}{+\dimen0}\xmin
\dosomeovalcalc{#1}{-\dimen0}\xmax
\dosomeovalcalc{#2}{-\dimen0}\ymax
\dosomeovalcalc{-#3}{+\dimen0}\ymin
\dosomeovalcalc{#4}{0pt}\stroke
\dosomeovalcalc{#5}{0pt}\radius
\edef\dostroke{#6}%
\edef\dofill{#7}%
\setbox\nextbox\hbox
{\ifnum\dostroke\dofill>0
\special
{\@@insertpostscriptretain
gsave
newpath
\xmin\space \radius\space add \ymin\space moveto
\xmax\space \ymin\space \xmax\space \ymax\space \radius\space arcto
\xmax\space \ymax\space \xmin\space \ymax\space \radius\space arcto
\xmin\space \ymax\space \xmin\space \ymin\space \radius\space arcto
\xmin\space \ymin\space \xmax\space \ymin\space \radius\space arcto
\xmin\space \radius\space add \ymin\space moveto
16 {pop} repeat
closepath
(\dostroke) (1) eq
{\stroke\space 0 ne
{gsave
\stroke\space setlinewidth
stroke
grestore} if} if
(\dofill) (1) eq
{fill} if
grestore}%
\fi}%
\nextboxwd#1%
\nextboxht#2%
\nextboxdp#3%
\flushnextbox
\egroup}
%D The indirect call permits a (rather) dirty hack, needed
%D for \DVIPS\ support.
\definespecial\doovalbox
{\dosomeovalbox}
%D \macros
%D {dostartclipping,dostopclipping}
%D
%D These two specials are not yet working as expected.
\definespecial\dostartclipping#1#2#3%
{\PointsToBigPoints{#2}\width
\PointsToBigPoints{#3}\height
\grabMPclippath{#1}{0}{\width}{\height}
{0 0 moveto \width 0 lineto \width \height lineto 0 \height\space lineto}%
\special
{\@@insertpostscriptliteral\space
save newpath \MPclippath\space closepath clip}}
\definespecial\dostopclipping
{\special{\@@insertpostscriptliteral\space restore}}
%D Some MP stuff:
\definespecial\doinsertMPfile#1%
{\doiffileelse{./#1}{\includeMPasEPS{./#1}}{\message{[MP #1]}}}
\stopspecials
\endinput
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