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+%D \module
+%D [ file=mp-text.mp,
+%D version=2000.07.10,
+%D title=\CONTEXT\ \METAPOST\ graphics,
+%D subtitle=text support,
+%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.
+
+%D Under construction.
+
+if known context_text : endinput ; fi ;
+
+boolean context_text ; context_text := true ;
+
+if unknown noftexpictures :
+ numeric noftexpictures ; noftexpictures := 0 ;
+fi ;
+
+if unknown texpictures[1] :
+ picture texpictures[] ;
+fi ;
+
+numeric textextoffset ; textextoffset := 0 ;
+
+% vardef textext@#(expr txt) =
+% interim labeloffset := textextoffset ;
+% noftexpictures := noftexpictures + 1 ;
+% if string txt :
+% write "% figure " & decimal charcode & " : " &
+% "texpictures[" & decimal noftexpictures & "] := btex " &
+% txt & " etex ;" to jobname & ".mpt" ;
+% if unknown texpictures[noftexpictures] :
+% thelabel@#("unknown",origin)
+% else :
+% thelabel@#(texpictures[noftexpictures],origin)
+% fi
+% else :
+% thelabel@#(txt,origin)
+% fi
+% enddef ;
+
+boolean hobbiestextext ; hobbiestextext := false ;
+% string textextstring ; textextstring := "" ;
+
+% def resettextextdirective =
+% textextstring := "" ;
+% enddef ;
+
+% def textextdirective text t =
+% textextstring := textextstring & t ;
+% enddef ;
+
+vardef textext@#(expr txt) =
+ save _s_ ; string _s_ ;
+ interim labeloffset := textextoffset ;
+ noftexpictures := noftexpictures + 1 ;
+ if string txt :
+ if hobbiestextext : % the tex.mp method as fallback (see tex.mp)
+ write _s_ & "btex " & txt & " etex" to "mptextmp.mp" ;
+ write EOF to "mptextmp.mp" ;
+ scantokens "input mptextmp"
+ else :
+ write "% figure " & decimal charcode & " : " &
+ "texpictures[" & decimal noftexpictures & "] := btex " &
+ txt & " etex ;" to jobname & ".mpt" ;
+ if unknown texpictures[noftexpictures] :
+ thelabel@#("unknown",origin)
+ else :
+ thelabel@#(texpictures[noftexpictures],origin)
+ fi
+ fi
+ else :
+ thelabel@#(txt,origin)
+ fi
+enddef ;
+
+string laboff_ ; laboff_ := "" ;
+string laboff_c ; laboff_c := "" ;
+string laboff_l ; laboff_l := ".lft" ;
+string laboff_r ; laboff_r := ".rt" ;
+string laboff_b ; laboff_b := ".bot" ;
+string laboff_t ; laboff_t := ".top" ;
+
+string laboff_lt ; laboff_lt := ".ulft" ;
+string laboff_rt ; laboff_rt := ".urt" ; % bugged, conflict with r
+string laboff_lb ; laboff_lb := ".llft" ;
+string laboff_rb ; laboff_rb := ".lrt" ;
+string laboff_tl ; laboff_tl := ".ulft" ;
+string laboff_tr ; laboff_tr := ".urt" ;
+string laboff_bl ; laboff_bl := ".llft" ;
+string laboff_br ; laboff_br := ".lrt" ;
+
+vardef textextstr(expr s, a) =
+ save ss ; string ss ;
+ ss := "laboff_" & a ;
+ ss := scantokens ss ;
+ ss := "textext" & ss & "(" & ditto & s & ditto & ")" ;
+ scantokens ss
+enddef ;
+
+pair laboff.origin ; laboff.origin = (0,0) ; % (infinity,infinity) ;
+pair laboff.raw ; laboff.raw = (0,0) ; % (infinity,infinity) ;
+
+laboff.origin = (0,0) ; labxf.origin := 0 ; labyf.origin := 0 ;
+laboff.raw = (0,0) ; labxf.raw := 0 ; labyf.raw := 0 ;
+
+vardef thelabel@#(expr s, z) =
+ save p ; picture p ;
+ p = s if not picture s : infont defaultfont scaled defaultscale fi ;
+% wrong, see myway textext
+% if laboff@#<>laboff.origin :
+ (p shifted (z + labeloffset*laboff@# - (labxf@#*lrcorner p +
+ labyf@#*ulcorner p + (1-labxf@#-labyf@#)*llcorner p)))
+% else :
+% (p shifted z)
+% fi
+enddef;
+
+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\chardef\parfirst=1 " ;
+ 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 ;
+
+vardef verbatim(expr str) =
+ ditto & "\detokenize{" & str & "}" & ditto
+enddef ;