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Diffstat (limited to 'metapost/context/mp-text.mp')
| -rw-r--r-- | metapost/context/mp-text.mp | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/metapost/context/mp-text.mp b/metapost/context/mp-text.mp new file mode 100644 index 000000000..c08bac5ff --- /dev/null +++ b/metapost/context/mp-text.mp @@ -0,0 +1,202 @@ +%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 unknown context_tool : input mp-tool ; fi ; +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 ; + +pair laboff.origin ; laboff.origin = (infinity,infinity) ; +pair laboff.raw ; laboff.raw = (infinity,infinity) ; + +vardef thelabel@#(expr s, z) = + save p ; picture p ; + p = s if not picture s : infont defaultfont scaled defaultscale fi ; + 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 ; |