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%D \module
%D [ file=mp-fobg.mp,
%D version=2004.03.12,
%D title=\CONTEXT\ \METAPOST\ graphics,
%D subtitle=Formatting Objects,
%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 licen-en.pdf for
%C details.
if unknown context_tool : input mp-tool ; fi ;
if known context_fobg : endinput ; fi ;
boolean context_fobg ; context_fobg := true ;
FoNone := 0 ; FoHidden := 1 ; FoDotted := 2 ; FoDashed := 3 ; FoSolid := 4 ;
FoDouble := 5 ; FoGroove := 6 ; FoRidge := 7 ; FoInset := 8 ; FoOutset := 9 ;
FoAll := 0 ; FoTop := 1 ; FoBottom := 2 ; FoLeft := 3 ; FoRight := 4 ;
FoMedium := .5pt ; FoThin := FoMedium/2 ; FoThick := FoMedium*2 ;
color FoBackgroundColor, FoNoColor, FoLineColor[] ; FoNoColor := (-1,-1,-1) ;
numeric FoLineWidth[], FoLineStyle[] ;
boolean FoFrame, FoBackground, FoSplit ;
FoFrame := FoBackground := FoSplit := false ;
FoBackgroundColor := white ;
FoDashFactor := .5 ;
FoDotFactor := .375 ;
for i = FoAll upto FoRight :
FoLineColor[i] := black ;
FoLineWidth[i] := .5pt ;
FoLineStyle[i] := FoNone ;
endfor ;
def DrawFoFrame(expr n, p) =
drawoptions(withcolor FoLineColor[n] withpen pencircle scaled FoLineWidth[n]) ;
if FoLineStyle[n] = FoNone :
% nothing
elseif FoLineStyle[n] = FoHidden :
% nothing
elseif FoLineStyle[n] = FoDotted :
draw p dashed (withdots scaled (FoDotFactor*FoLineWidth[n])) ;
elseif FoLineStyle[n] = FoDashed :
draw p dashed (evenly scaled (FoDashFactor*FoLineWidth[n])) ;
elseif FoLineStyle[n] = FoSolid :
draw p ;
elseif FoLineStyle[n] = FoDouble :
draw p enlarged FoLineWidth[n] ; draw p enlarged -FoLineWidth[n] ;
elseif FoLineStyle[n] = FoGroove :
draw p ;
draw p withpen pencircle scaled .5FoLineWidth[n] withcolor (inverted FoLineColor[n] softened .5) ;
elseif FoLineStyle[n] = FoRidge :
draw p withcolor (inverted FoLineColor[n] softened .5) ;
draw p withpen pencircle scaled .5FoLineWidth[n] ;
elseif FoLineStyle[n] = FoInset :
draw p ; draw p inset 2.5FoLineWidth[n] ;
elseif FoLineStyle[n] = FoOutset :
draw p ; draw p outset 2.5FoLineWidth[n] ;
fi ;
enddef ;
primarydef p outset d =
((lrcorner p -- urcorner p -- ulcorner p -- llcorner p -- cycle)
shifted (d*(-1,1)) cutbefore topboundary p) cutafter leftboundary p
enddef ;
primarydef p inset d =
((ulcorner p -- llcorner p -- lrcorner p -- urcorner p -- cycle)
shifted (d*(1,-1)) cutbefore bottomboundary p) cutafter rightboundary p
enddef ;
vardef equalpaths(expr p, q) =
if length(p) = length(q) :
save ok ; boolean ok ; ok := true ;
for i = 0 upto length(p)-1 :
ok := ok and (round(point i of p) = round(point i of q)) ;
endfor ;
ok
else :
false
fi
enddef ;
endinput ;
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