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%D \module
%D [ file=mp-text.mpiv,
%D version=2000.07.10,
%D title=\CONTEXT\ \METAPOST\ graphics,
%D subtitle=text support,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%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.
%D This one is only used in metafun so it will become a module.
if known context_text : endinput ; fi ;
boolean context_text ; context_text := true ;
def build_parshape (expr p, offset_or_path, dx, dy, baselineskip, strutheight, strutdepth, topskip) =
if unknown trace_parshape :
boolean trace_parshape ; trace_parshape := false ;
fi ;
begingroup ;
save
q, l, r, line, tt, bb,
n, hsize, vsize, vvsize, voffset, hoffset, width, indent,
ll, lll, rr, rrr, cp, cq, t, b ;
path
q, l, r, line, tt, bb ;
numeric
n, hsize, vsize, vvsize, voffset, hoffset, width[], indent[] ;
pair
ll, lll, rr, rrr, cp, cq, t, b ;
n := 0 ;
cp := center p ;
if path offset_or_path :
q := offset_or_path ;
cq := center q ;
voffset := dy ;
hoffset := dx ;
else :
q := p ;
cq := center q ;
hoffset := offset_or_path + dx ;
voffset := offset_or_path + dy ;
fi ;
hsize := xpart lrcorner q - xpart llcorner q ;
vsize := ypart urcorner q - ypart lrcorner q ;
q := p shifted - cp ;
startsavingdata ;
savedata "\global\parvoffset " & decimal voffset & "bp " ;
savedata "\global\parhoffset " & decimal hoffset & "bp " ;
savedata "\global\parwidth " & decimal hsize & "bp " ;
savedata "\global\parheight " & decimal vsize & "bp " ;
if not path offset_or_path :
q := q xscaled ((hsize-2hoffset)/hsize) yscaled ((vsize-2voffset)/vsize) ;
fi ;
hsize := xpart lrcorner q - xpart llcorner q ;
vsize := ypart urcorner q - ypart lrcorner q ;
t := (ulcorner q -- urcorner q) intersection_point q ;
b := (llcorner q -- lrcorner q) intersection_point q ;
if xpart directionpoint t of q < 0 :
q := reverse q ;
fi ;
l := q cutbefore t ;
l := l if xpart point 0 of q < 0 : & q fi cutafter b ;
r := q cutbefore b ;
r := r if xpart point 0 of q > 0 : & q fi cutafter t ;
% tt := (ulcorner q -- urcorner q) shifted (0,-topskip) ;
% bb := (llcorner q -- lrcorner q) shifted (0,strutdepth) ;
% l := l cutbefore (l intersection_point tt) ;
% l := l cutafter (l intersection_point bb) ;
% r := r cutbefore (r intersection_point bb) ;
% r := r cutafter (r intersection_point tt) ;
if trace_parshape :
drawarrow p withpen pencircle scaled 2pt withcolor red ;
drawarrow l shifted cp withpen pencircle scaled 1pt withcolor green ;
drawarrow r shifted cp withpen pencircle scaled 1pt withcolor blue ;
fi ;
vardef found_point (expr lin, pat, sig) =
pair a, b ;
a := pat intersection_point (lin shifted (0,strutheight)) ;
if intersection_found :
a := a shifted (0,-strutheight) ;
else :
a := pat intersection_point lin ;
fi ;
b := pat intersection_point (lin shifted (0,-strutdepth)) ;
if intersection_found :
if sig :
if xpart b > xpart a : a := b shifted (0,strutdepth) fi ;
else :
if xpart b < xpart a : a := b shifted (0,strutdepth) fi ;
fi ;
fi ;
a
enddef ;
if (strutheight+strutdepth<baselineskip) :
vvsize := vsize ;
else :
vvsize := (vsize div baselineskip) * baselineskip ;
fi ;
for i=topskip step baselineskip until vvsize :
line := (ulcorner q -- urcorner q) shifted (0,-i-eps) ;
ll := found_point(line,l,true ) ;
rr := found_point(line,r,false) ;
if trace_parshape :
fill (ll--rr--rr shifted (0,strutheight)--ll shifted (0,strutheight)--cycle) shifted cp withcolor .5white ;
fill (ll--rr--rr shifted (0,-strutdepth)--ll shifted (0,-strutdepth)--cycle) shifted cp withcolor .7white ;
draw ll shifted cp withpen pencircle scaled 2pt ;
draw rr shifted cp withpen pencircle scaled 2pt ;
draw (ll--rr) shifted cp withpen pencircle scaled .5pt ;
fi ;
n := n + 1 ;
indent[n] := abs(xpart ll - xpart llcorner q) ;
width[n] := abs(xpart rr - xpart ll) ;
if (i=strutheight) and (width[n]<baselineskip) :
n := n - 1 ;
savedata "\global\parfirst\plusone " ;
fi ;
endfor ;
savedata "\global\parlines " & decimal n ;
savedata "\global\partoks{ " ;
for i=1 upto n:
savedata decimal indent[i]&"bp " & decimal width[i]&"bp " ;
endfor ;
savedata "}" ;
stopsavingdata ;
endgroup ;
enddef ;
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