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Diffstat (limited to 'metapost/context/base/mp-core.mp')
-rw-r--r-- | metapost/context/base/mp-core.mp | 1116 |
1 files changed, 1116 insertions, 0 deletions
diff --git a/metapost/context/base/mp-core.mp b/metapost/context/base/mp-core.mp new file mode 100644 index 000000000..5f1341a69 --- /dev/null +++ b/metapost/context/base/mp-core.mp @@ -0,0 +1,1116 @@ +%D \module +%D [ file=mp-core.mp, +%D version=2000.something, % 1999.08.12, +%D title=\CONTEXT\ \METAPOST\ graphics, +%D subtitle=core interfacing, +%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_core : endinput ; fi ; + +boolean context_core ; context_core := true ; + +pair lxy[], rxy[], cxy[], llxy[], lrxy[], ulxy[], urxy[] ; +path pxy[] ; +numeric hxy[], wxy[], dxy[], nxy[] ; + +def box_found (expr n,x,y,w,h,d) = + not ((x=0) and (y=0) and (w=0) and (h=0) and (d=0)) +enddef ; + +def initialize_box_pos (expr pos,n,x,y,w,h,d) = + pair lxy, rxy, cxy, llxy, lrxy, ulxy, urxy ; + path pxy ; numeric hxy, wxy, dxy, nxy; + lxy := (x,y) ; + llxy := (x,y-d) ; + lrxy := (x+w,y-d) ; + urxy := (x+w,y+h) ; + ulxy := (x,y+h) ; + wxy := w ; + hxy := h ; + dxy := d ; + rxy := lxy shifted (wxy,0) ; + pxy := llxy--lrxy--urxy--ulxy--cycle ; + cxy := center pxy ; + nxy := n ; + freeze_box(pos) ; +enddef ; + +def freeze_box (expr pos) = + lxy[pos] := lxy ; + llxy[pos] := llxy ; + lrxy[pos] := lrxy ; + urxy[pos] := urxy ; + ulxy[pos] := ulxy ; + wxy[pos] := wxy ; + hxy[pos] := hxy ; + dxy[pos] := dxy ; + rxy[pos] := rxy ; + pxy[pos] := pxy ; + cxy[pos] := cxy ; + nxy[pos] := nxy ; +enddef ; + +def initialize_box (expr n,x,y,w,h,d) = + + numeric bpos ; bpos := 0 ; initialize_box_pos(bpos,n,x,y,w,h,d) ; + +enddef ; + +def initialize_area (expr fn,fx,fy,fw,fh,fd, + tn,tx,ty,tw,th,td) = + + numeric fpos ; fpos := 1 ; initialize_box_pos(fpos,fn,fx,fy,fw,fh,fd) ; + numeric tpos ; tpos := 2 ; initialize_box_pos(tpos,tn,tx,ty,tw,th,td) ; + + do_initialize_area (fpos, tpos) ; + +enddef ; + +def do_initialize_area (expr fpos, tpos) = + lxy := lxy[fpos] ; + llxy := (xpart llxy[fpos], ypart llxy[tpos]) ; + lrxy := lrxy[tpos] ; + urxy := (xpart urxy[tpos], ypart urxy[fpos]) ; + ulxy := ulxy[fpos] ; + wxy := xpart lrxy - xpart llxy ; + hxy := hxy[fpos] ; + dxy := dxy[tpos] ; + rxy := lxy shifted (wxy,0) ; + pxy := llxy--lrxy--urxy--ulxy--cycle ; + cxy := center pxy ; +enddef ; + +def set_par_line_height (expr ph, pd) = + par_strut_height := + if ph>0 : ph elseif StrutHeight>0 : StrutHeight else : 8pt fi ; + par_strut_depth := + if pd>0 : pd elseif StrutDepth >0 : StrutDepth else : 3pt fi ; + par_line_height := + par_strut_height + par_strut_depth ; +enddef ; + +def initialize_par (expr fn,fx,fy,fw,fh,fd, + tn,tx,ty,tw,th,td, + mn,mx,my,mw,mh,md, + pn,px,py,pw,ph,pd, + rw,rl,rr,rh,ra,ri) = + + numeric fpos ; fpos := 1 ; initialize_box_pos(fpos,fn,fx,fy,fw,fh,fd) ; + numeric tpos ; tpos := 2 ; initialize_box_pos(tpos,tn,tx,ty,tw,th,td) ; + numeric mpos ; mpos := 3 ; initialize_box_pos(mpos,mn,mx,my,mw,mh,md) ; + numeric ppos ; ppos := 4 ; initialize_box_pos(ppos,pn,px,py,pw,ph,pd) ; + + numeric par_strut_height, par_strut_depth, par_line_height ; + + set_par_line_height (ph, pd) ; + + do_initialize_area (fpos, tpos) ; + do_initialize_par (fpos, tpos, mpos, ppos, rw,rl,rr,rh,ra,ri) ; + +enddef ; + +def initialize_area_par (expr fn,fx,fy,fw,fh,fd, + tn,tx,ty,tw,th,td, + wn,wx,wy,ww,wh,wd) = + + numeric fpos ; fpos := 1 ; initialize_box_pos(fpos,fn,fx,fy,fw,fh,fd) ; + numeric tpos ; tpos := 2 ; initialize_box_pos(tpos,tn,tx,ty,tw,th,td) ; + numeric wpos ; wpos := 3 ; initialize_box_pos(wpos,wn,wx,wy,ww,wh,wd) ; + + numeric par_strut_height, par_strut_depth, par_line_height ; + + set_par_line_height (wh, wd) ; + + numeric ffpos ; ffpos := 4 ; initialize_box_pos(ffpos,wn,wx,fy,0,wh,wd) ; + numeric ttpos ; ttpos := 5 ; initialize_box_pos(ttpos,wn,wx+ww,ty,0,wh,wd) ; + + do_initialize_area (ffpos, ttpos) ; + + numeric mpos ; mpos := 6 ; freeze_box(mpos) ; + +% do_initialize_area (fpos, tpos) ; + do_initialize_par (fpos, tpos, mpos, ffpos, 0,0,0,0,0,0) ; + +enddef ; + +def do_initialize_par (expr fpos, tpos, mpos, ppos, rw,rl,rr,rh,ra,ri) = + + pair lref, rref, pref, lhref, rhref ; + + % clip the page area to the left and right skips + + llxy[mpos] := llxy[mpos] shifted (+rl,0) ; + lrxy[mpos] := lrxy[mpos] shifted (-rr,0) ; + urxy[mpos] := urxy[mpos] shifted (-rr,0) ; + ulxy[mpos] := ulxy[mpos] shifted (+rl,0) ; + + % fixate the leftskip, rightskip and hanging indentation + + lref := (xpart llxy[mpos],ypart ulxy[ppos]) ; lhref := lref shifted (rh,0) ; + rref := (xpart lrxy[mpos],ypart urxy[ppos]) ; rhref := rref shifted (rh,0) ; + + pref := lxy[ppos] ; + + if nxy[tpos] > nxy[fpos] : + if nxy[fpos] = nxy[mpos] : + % first of multiple pages + llxy[tpos] := llxy[mpos] ; + lrxy[tpos] := lrxy[mpos] ; + urxy[tpos] := lrxy[mpos] shifted (0,par_line_height) ; + ulxy[tpos] := llxy[mpos] shifted (0,par_line_height) ; + boxgriddirection := down ; + elseif nxy[tpos] = nxy[mpos] : + % last of multiple pages + llxy[fpos] := ulxy[mpos] shifted (0,-par_line_height) ; + lrxy[fpos] := urxy[mpos] shifted (0,-par_line_height) ; + urxy[fpos] := urxy[mpos] ; + ulxy[fpos] := ulxy[mpos] ; + boxgriddirection := up ; + else : + % middle of multiple pages + llxy[fpos] := ulxy[mpos] shifted (0,-par_line_height) ; + lrxy[fpos] := urxy[mpos] shifted (0,-par_line_height) ; + urxy[fpos] := urxy[mpos] ; + ulxy[fpos] := ulxy[mpos] ; + llxy[tpos] := llxy[mpos] ; + lrxy[tpos] := lrxy[mpos] ; + urxy[tpos] := lrxy[mpos] shifted (0,par_line_height) ; + ulxy[tpos] := llxy[mpos] shifted (0,par_line_height) ; + boxgriddirection := up ; + fi ; + else : + % just one page + boxgriddirection := up ; + fi ; + + path txy, bxy, pxy, mxy ; + + txy := originpath ; % top + bxy := originpath ; % bottom + pxy := originpath ; % composed + + boolean lefthang, righthang, somehang ; + + % we only hang on the first of a multiple page background + + if nxy[mpos] > nxy[fpos] : + lefthang := righthang := somehang := false ; + else : + lefthang := (rh>0) ; righthang := (rh<0) ; somehang := false ; + fi ; + + if lefthang : + mxy := boundingbox (lref -- lref shifted (rh,ra*par_line_height)) ; + elseif righthang : + mxy := boundingbox (rref -- rref shifted (rh,ra*par_line_height)) ; + else : + mxy := originpath ; + fi ; + + if round(ypart llxy[fpos]) = round(ypart llxy[tpos]) : + + % We have a one-liner. Watch how er use the bottom pos for + % determining the height. + + llxy[fpos] := (xpart llxy[fpos], ypart llxy[tpos]) ; + ulxy[fpos] := (xpart ulxy[fpos], ypart ulxy[tpos]) ; + + else : + + % We have a multi-liner. For convenience we now correct the + % begin and end points for indentation. + + if lefthang and (round(ypart llxy[tpos]) >= round(ypart lrcorner mxy)) : + llxy[tpos] := (xpart lhref, ypart llxy[tpos]) ; + ulxy[tpos] := (xpart lhref, ypart ulxy[tpos]) ; + else : + llxy[tpos] := (xpart lref, ypart llxy[tpos]) ; + ulxy[tpos] := (xpart lref, ypart ulxy[tpos]) ; + fi ; + + if righthang and (round(ypart lrxy[fpos]) >= round(ypart llcorner mxy)) : + lrxy[fpos] := (xpart rhref, ypart lrxy[fpos]) ; + urxy[fpos] := (xpart rhref, ypart urxy[fpos]) ; + else : + lrxy[fpos] := (xpart rref, ypart lrxy[fpos]) ; + urxy[fpos] := (xpart rref, ypart urxy[fpos]) ; + fi ; + + fi ; + + somehang := (ypart ulxy[fpos]>ypart llcorner mxy) and + (ypart llxy[tpos]<ypart llcorner mxy) ; + + if round(ypart llxy[fpos]) = round(ypart llxy[tpos]) : + + % A (short) one-liner goes into the top box. + + txy := llxy[fpos] -- lrxy[tpos] -- urxy[tpos] -- ulxy[fpos] -- cycle ; + + elseif (round(ypart llxy[fpos]) = round(ypart ulxy[tpos])) and + (round(xpart lrxy[tpos]) < round(xpart llxy[fpos])) : + + % We have a sentence that spans two lines but with only end + % of line and begin of line segments. We need to take care of + % indentation. + + txy := llxy[fpos] -- lrxy[fpos] -- urxy[fpos] -- ulxy[fpos] -- cycle ; + bxy := llxy[tpos] -- lrxy[tpos] -- urxy[tpos] -- ulxy[tpos] -- cycle ; + + elseif (round(ypart llxy[fpos]) = round(ypart ulxy[tpos])) : + + % We have a sentence that spans two lines but with overlap. + + pxy := llxy[tpos] -- lrxy[tpos] -- urxy[tpos] -- lrxy[fpos] -- + urxy[fpos] -- ulxy[fpos] -- llxy[fpos] -- ulxy[tpos] -- cycle ; + + elseif lefthang and somehang : + + % We have a sentence that spans more than two lines with + % left hanging indentation. + + pxy := llxy[tpos] -- lrxy[tpos] -- urxy[tpos] -- + (xpart urxy[fpos],ypart urxy[tpos]) -- + urxy[fpos] -- ulxy[fpos] -- llxy[fpos] -- + if round(ypart urxy[tpos]) < round(ypart llcorner mxy) : + (xpart lrcorner mxy,ypart llxy[fpos]) -- + lrcorner mxy -- + (xpart llxy[tpos],ypart llcorner mxy) -- + else : + (xpart llxy[tpos],ypart llxy[fpos]) -- + fi + cycle ; + + elseif righthang and somehang : + + % We have a sentence that spans more than two lines with + % right hanging indentation. + + pxy := llxy[tpos] -- lrxy[tpos] -- urxy[tpos] -- + if round(ypart urxy[tpos]) < round(ypart llcorner mxy) : + (xpart lrcorner mxy,ypart urxy[tpos]) -- + lrcorner mxy -- llcorner mxy -- + else : + (xpart urxy[fpos],ypart urxy[tpos]) -- + fi + urxy[fpos] -- ulxy[fpos] -- llxy[fpos] -- + (xpart llxy[tpos],ypart llxy[fpos]) -- + cycle ; + + else : + + % We have a sentence that spans more than two lines with + % no hanging indentation. + + pxy := llxy[tpos] -- lrxy[tpos] -- urxy[tpos] -- + (xpart urxy[fpos],ypart urxy[tpos]) -- + urxy[fpos] -- ulxy[fpos] -- llxy[fpos] -- + (xpart llxy[tpos],ypart llxy[fpos]) -- cycle ; + + fi ; + + pxy := simplified pxy ; + pxy := unspiked pxy ; + +enddef ; + +TopSkip := 0 ; % will move +StrutHeight := 0 ; % will move + +pair last_multi_par_shift ; last_multi_par_shift := origin ; + +def relocate_multipars (expr xy) = + last_multi_par_shift := xy ; + for i=1 upto nofmultipars : + multipars[i] := multipars[i] shifted last_multi_par_shift ; + endfor ; +enddef ; + +boolean compensate_multi_par_topskip ; +boolean span_multi_column_pars ; +boolean auto_multi_par_hsize ; + +compensate_multi_par_topskip := true ; +span_multi_column_pars := false ; +auto_multi_par_hsize := false ; % true ; + +vardef multi_par_at_top (expr i) = + (round (ypart ulcorner multipars[i]) = round (ypart ulcorner + (TextAreas[multirefs[i]] shifted last_multi_par_shift))) +enddef ; + +numeric nofmultipars ; nofmultipars := 0 ; + +boolean obey_multi_par_hang ; obey_multi_par_hang := true ; +boolean obey_multi_par_more ; obey_multi_par_more := true ; +boolean snap_multi_par_tops ; snap_multi_par_tops := true ; +boolean local_multi_par_area ; local_multi_par_area := false ; +boolean ignore_multi_par_page ; ignore_multi_par_page := false ; + +def simplify_multi_pars = % boundingbox ipv shape als optie + for i := 1 upto nofmultipars : + multipars[i] := boundingbox multipars[i] ; + endfor ; +enddef ; + +def save_multipar (expr i, l, p) = + nofmultipars := nofmultipars + 1 ; + multirefs[nofmultipars] := i ; + multilocs[nofmultipars] := l ; + multipars[nofmultipars] := unspiked (simplified p) ; +enddef ; + +def prepare_multi_pars (expr fn,fx,fy,fw,fh,fd, + tn,tx,ty,tw,th,td, + wn,wx,wy,ww,wh,wd, + pn,px,py,pw,ph,pd, + rw,rl,rr,rh,ra,ri) = + + if span_multi_column_pars : + begingroup ; + save TextAreas ; path TextAreas[] ; + save NOfTextAreas ; numeric NOfTextAreas ; + for i=1 upto NOfTextColumns : + TextAreas[i] := TextColumns[i] ; + endfor ; + NOfTextAreas := NOfTextColumns ; + fi ; + + last_multi_par_shift := origin ; + + numeric fpos ; fpos := 1 ; initialize_box_pos(fpos,fn,fx,fy,fw,fh,fd) ; + numeric tpos ; tpos := 2 ; initialize_box_pos(tpos,tn,tx,ty,tw,th,td) ; + numeric wpos ; wpos := 3 ; initialize_box_pos(wpos,wn,wx,wy,ww,wh,wd) ; + numeric ppos ; ppos := 4 ; initialize_box_pos(ppos,pn,px,py,pw,ph,pd) ; + +if local_multi_par_area : + RealPageNumber := fn ; + NOfTextAreas := 1 ; + NOfSavedTextAreas := 0 ; + TextAreas[1] := TextAreas[0] ; + TextColumns[1] := TextColumns[0] ; + nxy[fpos] := nxy[tpos] := nxy[wpos] := nxy[ppos] := RealPageNumber ; + +%draw TextColumns[1] withcolor green ; +%draw TextAreas[1] withcolor green ; + +elseif ignore_multi_par_page : + RealPageNumber := fn ; + nxy[fpos] := nxy[tpos] := nxy[wpos] := nxy[ppos] := RealPageNumber ; +fi ; + + numeric par_strut_height, par_strut_depth, par_line_height ; + + set_par_line_height (ph, pd) ; + + numeric par_hang_indent, par_hang_after, par_indent, par_left_skip ; + + par_hang_indent := rh ; + par_hang_after := ra ; + par_indent := ri ; + par_left_skip := rl ; + + pair par_start_pos ; + +% par_start_pos := llxy[fpos] if par_indent<0: shifted (-par_indent,0) fi ; + + par_start_pos := llxy[fpos] + if par_indent <0: shifted (-par_indent, 0) fi + if par_left_skip<0: shifted (-par_left_skip,0) fi ; + + if wxy[wpos]>0 : + left_skip := rl + xpart llxy[wpos] - xpart llxy[ppos] ; + right_skip := rw - left_skip - ww ; + else : + left_skip := rl ; + right_skip := rr ; + fi ; + + path multipar, multipars[] ; + numeric multiref, multirefs[] ; + numeric multiloc, multilocs[] ; % 1=begin 2=between 3=end + + numeric multi_par_pages ; multi_par_pages := nxy[tpos]-nxy[fpos]+1 ; + + ii := 0 ; nn := NOfTextAreas+1 ; nofmultipars := 0 ; + + vardef snapped_multi_pos (expr p) = + if snap_multi_par_tops : + if abs(ypart p - ypart ulcorner multipar) < par_line_height : + (xpart p,ypart ulcorner multipar) + else : + p + fi + else : + p + fi + enddef ; + + % def set_multipar (expr i) = + % ((TextAreas[i] leftenlarged -left_skip) rightenlarged -right_skip) + % enddef ; + + vardef set_multipar (expr i) = + ( (TextAreas[i] leftenlarged -left_skip) rightenlarged (-right_skip + if auto_multi_par_hsize : + rw - bbwidth(TextAreas[i]) fi) ) + enddef ; + + vardef top_multi_par(expr p) = + (round(estimated_par_lines(bbheight(p)*par_line_height))=round(bbheight(p))) + enddef ; + + vardef multi_par_tsc(expr p) = + if top_multi_par(p) : TopSkipCorrection else : 0 fi + enddef ; + + vardef estimated_par_lines (expr h) = + round(h/par_line_height) + enddef ; + + vardef estimated_multi_par_height (expr n, t) = + if round(par_line_height)=0 : + 0 + else : + save ok, h ; boolean ok ; + numeric h ; h := 0 ; + ok := false ; + if (nxy[fpos]=RealPageNumber-1) : + for i := 1 upto NOfSavedTextAreas : + if (InsideSavedTextArea(i,par_start_pos)) : + ok := true ; + h := h + estimated_par_lines(ypart ulxy[fpos] - + ypart llcorner SavedTextAreas[i]) ; + elseif ok : + h := h + estimated_par_lines(bbheight(SavedTextAreas[i])) ; + fi ; + endfor ; + fi ; + if ok : + for i := 1 upto n-1 : + h := h + estimated_par_lines(bbheight(TextAreas[i])) ; + endfor ; + else : + % already: ok := false ; + for i := 1 upto n-1 : + if (InsideTextArea(i,par_start_pos)) : + ok := true ; + h := h + estimated_par_lines(ypart ulxy[fpos] - ypart llcorner TextAreas[i]) ; + elseif ok : + h := h + estimated_par_lines(bbheight(TextAreas[i])) ; + fi ; + endfor ; + fi ; + h + fi + enddef ; + + vardef left_top_hang (expr same_area) = + +par_hang_after := ra + estimated_par_lines(py-fy) ; + + if (par_hang_indent>0) and (par_hang_after<0) and obey_multi_par_hang : + pair _ul_ ; _ul_ := (xpart ulcorner multipar, ypart snapped_multi_pos(ulxy[fpos])); + pair _pa_ ; _pa_ := _ul_ shifted (0,par_hang_after*par_line_height) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart llcorner multipar)) ; + if same_area : + _pa_ := (xpart _pa_,max(ypart _pa_,ypart llxy[tpos])) ; + fi ; +% vervalt: + if obey_multi_par_more and (round(par_line_height)>0) : + par_hang_after := min(0,round(par_hang_after + + (ypart urxy[fpos]-ypart _pa_)/par_line_height)) ; + fi ; + (xpart _ul_ + par_hang_indent, ypart lrxy[fpos]) -- + (xpart _ul_ + par_hang_indent, ypart _pa_) -- + (xpart ulcorner multipar, ypart _pa_) + else : + (xpart ulcorner multipar, ypart lrxy[fpos]) + fi + enddef ; + + vardef right_top_hang (expr same_area) = + +par_hang_after := ra - estimated_par_lines(py-fy) ; + + if (par_hang_indent<0) and (par_hang_after<0) and obey_multi_par_hang : + pair _ur_ ; _ur_ := (xpart urcorner multipar, ypart snapped_multi_pos(urxy[fpos])) ; + pair _pa_ ; _pa_ := _ur_ shifted (0,par_hang_after*par_line_height) ; + _pa_ := (xpart _pa_,max(ypart _pa_ -TopSkipCorrection,ypart llcorner multipar)) ; + if same_area : + _pa_ := (xpart _pa_,max(ypart _pa_ -TopSkipCorrection,ypart snapped_multi_pos(ulxy[tpos]))) ; + fi ; + if obey_multi_par_more and (round(par_line_height)>0) : + par_hang_after := min(0,round(par_hang_after + + (ypart urxy[fpos]-ypart _pa_)/par_line_height)) ; + fi ; + (xpart urcorner multipar, ypart _pa_) -- + (xpart _ur_ + par_hang_indent, ypart _pa_) -- + (xpart _ur_ + par_hang_indent, ypart snapped_multi_pos(urxy[fpos])) + else : + (xpart urcorner multipar, ypart snapped_multi_pos(urxy[fpos])) + fi + enddef ; + + vardef x_left_top_hang (expr i, t) = + par_hang_after := min(0,ra + estimated_multi_par_height(i,t)) ; + if (par_hang_indent>0) and (par_hang_after<0) : + pair _ul_ ; _ul_ := ulcorner multipar ; + pair _pa_ ; _pa_ := _ul_ shifted (0,par_hang_after*par_line_height) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart llcorner multipar)) ; + +if t : + _pa_ := (xpart _pa_,max(ypart _pa_,ypart llxy[tpos])); +fi ; +if abs(ypart _pa_-ypart llxy[tpos])<par_line_height : + _pa_ := (xpart _pa_,ypart llxy[tpos]); +fi ; +if abs(ypart _pa_-ypart llcorner multipar)<par_line_height : + _pa_ := (xpart _pa_,ypart llcorner multipar); +fi ; + + (xpart _ul_, ypart _pa_) -- + (xpart _ul_ + par_hang_indent, ypart _pa_) -- + (xpart _ul_ + par_hang_indent, ypart _ul_) + else : + ulcorner multipar + fi + enddef ; + +% here + + vardef x_right_top_hang (expr i, t) = + par_hang_after := min(0,ra + estimated_multi_par_height(i,t)) ; + if (par_hang_indent<0) and (par_hang_after<0) : + pair _ur_ ; _ur_ := urcorner multipar ; + pair _pa_ ; _pa_ := _ur_ shifted (0,par_hang_after*par_line_height) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart lrcorner multipar)) ; +if t : + _pa_ := (xpart _pa_,max(ypart _pa_,ypart snapped_multi_pos(urxy[tpos]))) ; +fi ; + +%todo +% +%if abs(ypart _pa_-ypart llxy[tpos])<par_line_height : +% _pa_ := (xpart _pa_,ypart llxy[tpos]); +%fi ; +%if abs(ypart _pa_-ypart llcorner multipar)<par_line_height : +% _pa_ := (xpart _pa_,ypart llcorner multipar); +%fi ; + + (xpart _ur_ + par_hang_indent, ypart _ur_) -- + (xpart _ur_ + par_hang_indent, ypart _pa_) -- + (xpart _ur_, ypart _pa_) + else : + urcorner multipar + fi + enddef ; + + vardef left_bottom_hang (expr same_area) = + pair _ll_, _sa_, _pa_ ; + _sa_ := if same_area : llxy[tpos] else : lrcorner multipar fi ; + if (par_hang_indent>0) and (par_hang_after>0) and obey_multi_par_hang : + _ll_ := (xpart ulcorner multipar, ypart snapped_multi_pos(ulxy[fpos])) ; + _pa_ := _ll_ shifted (0,-par_hang_after*par_line_height) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart llcorner multipar)) ; + if same_area : + _pa_ := (xpart _pa_,max(ypart _pa_,ypart _sa_)) ; + fi ; + if obey_multi_par_more and (round(par_line_height)>0) : + par_hang_after := max(0,round(par_hang_after - + (ypart urxy[fpos]-ypart _pa_)/par_line_height)) ; + fi ; + _pa_ -- + (xpart _pa_ + par_hang_indent,ypart _pa_) -- + (xpart _pa_ + par_hang_indent,ypart _sa_) + else : + (xpart llcorner multipar, ypart _sa_) + fi + enddef ; + + vardef right_bottom_hang (expr same_area) = + pair _lr_, _sa_, _pa_ ; + _sa_ := if same_area : snapped_multi_pos(ulxy[tpos]) else : lrcorner multipar fi ; + if (par_hang_indent<0) and (par_hang_after>0) and obey_multi_par_hang : + _lr_ := (xpart urcorner multipar, ypart snapped_multi_pos(urxy[fpos])) ; + _pa_ := _lr_ shifted (0,-par_hang_after*par_line_height) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart lrcorner multipar)) ; + if same_area : + _pa_ := (xpart _pa_,max(ypart _pa_,ypart snapped_multi_pos(ulxy[tpos]))) ; + fi ; + if obey_multi_par_more and (round(par_line_height)>0) : + par_hang_after := max(0,round(par_hang_after - + (ypart urxy[fpos]-ypart _pa_)/par_line_height)) ; + fi ; + (xpart _pa_ + par_hang_indent,ypart _sa_) -- + (xpart _pa_ + par_hang_indent,ypart _pa_) -- + _pa_ + else : + (xpart lrcorner multipar, ypart _sa_) + fi + enddef ; + + vardef x_left_bottom_hang (expr i, t) = + pair _ll_, _sa_, _pa_ ; +if t : + _sa_ := llxy[tpos] ; +else : + _sa_ := llcorner multipar ; +fi ; + if (par_hang_indent>0) and (ra>0) : + par_hang_after := max(0,ra - estimated_multi_par_height(i,t)) ; + _ll_ := ulcorner multipar ; + _pa_ := _ll_ shifted (0,-par_hang_after*par_line_height) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart llcorner multipar)) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart _sa_)) ; + % we need to compensate for topskip enlarged areas + if abs(ypart _pa_ - ypart _sa_) > par_line_height : + (xpart _pa_ + par_hang_indent,ypart _sa_) -- + (xpart _pa_ + par_hang_indent,ypart _pa_) -- + fi + _pa_ + else : + (xpart llcorner multipar, ypart _sa_) + fi + enddef ; + + vardef x_right_bottom_hang (expr i, t) = + pair _lr_, _sa_, _pa_ ; +if t : + _sa_ := snapped_multi_pos(ulxy[tpos]) ; +else : + _sa_ := llcorner multipar ; +fi ; + if (par_hang_indent<0) and (ra>0) : + par_hang_after := max(0,ra - estimated_multi_par_height(i, t)) ; + _lr_ := urcorner multipar ; + _pa_ := _lr_ shifted (0,-par_hang_after*par_line_height) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart lrcorner multipar)) ; + _pa_ := (xpart _pa_,max(ypart _pa_,ypart _sa_)) ; + % we need to compensate for topskip enlarged areas + _pa_ + if abs(ypart _pa_ - ypart _sa_) > par_line_height : + -- (xpart _pa_ + par_hang_indent,ypart _pa_) + -- (xpart _pa_ + par_hang_indent,ypart _sa_) + fi + else : + (xpart lrcorner multipar, ypart _sa_) + fi + enddef ; + + def test_multipar = + multipar := + llcorner multipar -- + urcorner multipar -- + lrcorner multipar -- + ulcorner multipar -- + cycle ; + enddef ; + + % first loop + + for i=1 upto NOfTextAreas : + + TopSkipCorrection := 0 ; + + multipar := set_multipar(i) ; + + % watch how we compensate for negative indentation + + if (nxy[fpos]=RealPageNumber) and (InsideTextArea(i,par_start_pos)) : + + % first one in chain + + ii := i ; + + if (nxy[tpos]=RealPageNumber) and (InsideTextArea(i,llxy[tpos])) : + + % in same area + + nn := i ; + + if compensate_multi_par_topskip and (round(LineHeight-ph-pd)=0) : + + TopSkipCorrection := TopSkip - StrutHeight ; + + if round(ypart ulxy[fpos] + TopSkipCorrection) = + round(ypart ulcorner TextAreas[i]) : + ulxy[fpos] := ulxy[fpos] shifted (0,TopSkipCorrection) ; + urxy[fpos] := urxy[fpos] shifted (0,TopSkipCorrection) ; + else : + TopSkipCorrection := 0 ; + fi ; + + fi ; + + if ypart llxy[fpos] = ypart llxy[tpos] : + + multipar := + llxy[fpos] -- + lrxy[tpos] -- + %urxy[tpos] -- + snapped_multi_pos(urxy[tpos]) -- + %ulxy[fpos] -- + snapped_multi_pos(ulxy[fpos]) -- + cycle ; + + save_multipar (i,1,multipar) ; + + elseif (ypart llxy[fpos] = ypart ulxy[tpos]) and + (xpart llxy[tpos] < xpart llxy[fpos]) : + + % two loners + + multipar := if obey_multi_par_hang : + + right_bottom_hang(true) -- + right_top_hang(true) -- + snapped_multi_pos(urxy[fpos]) -- + lrxy[fpos] -- + + else : + + llxy[fpos] -- + (xpart urcorner multipar, ypart llxy[fpos]) -- + (xpart urcorner multipar, ypart ulxy[fpos]) -- + snapped_multi_pos(ulxy[fpos]) -- + + fi cycle ; + + save_multipar (i,1,multipar) ; + + multipar := set_multipar(i) ; + + multipar := if obey_multi_par_hang : + + left_bottom_hang(true) -- + llxy[tpos] -- + snapped_multi_pos(ulxy[tpos]) -- + left_top_hang(true) -- + + else : + + (xpart llcorner multipar, ypart llxy[tpos]) -- + llxy[tpos] -- + snapped_multi_pos(ulxy[tpos]) -- + (xpart llcorner multipar, ypart ulxy[tpos]) -- + + fi cycle ; + + save_multipar (i,1,multipar) ; + + else : + + multipar := if obey_multi_par_hang : + + left_bottom_hang(true) -- + llxy[tpos] -- + %ulxy[tpos] -- + snapped_multi_pos(ulxy[tpos]) -- + right_bottom_hang(true) -- + right_top_hang(true) -- + %urxy[fpos] -- + snapped_multi_pos(urxy[fpos]) -- + lrxy[fpos] -- + left_top_hang(true) -- + + else : + + (xpart llcorner multipar, ypart llxy[tpos]) -- + llxy[tpos] -- + %ulxy[tpos] -- + snapped_multi_pos(ulxy[tpos]) -- + (xpart lrcorner multipar, ypart ulxy[tpos]) -- + (xpart urcorner multipar, ypart urxy[fpos]) -- + %urxy[fpos] -- + snapped_multi_pos(urxy[fpos]) -- + lrxy[fpos] -- + (xpart ulcorner multipar, ypart lrxy[fpos]) -- + + fi cycle ; + + save_multipar (i,1,multipar) ; + + fi ; + + elseif (nxy[tpos]=RealPageNumber) : + + % outside text area, fall back / test on: pascal werkboek + + multipar := + + llxy[fpos] -- + lrxy[tpos] -- + urxy[tpos] -- + ulxy[fpos] -- cycle ; + + save_multipar (i,1,multipar) ; + + else : + + multipar := if obey_multi_par_hang : + + left_bottom_hang(false) -- + right_bottom_hang(false) -- + right_top_hang(false) -- + %urxy[fpos] -- + snapped_multi_pos(urxy[fpos]) -- + lrxy[fpos] -- + left_top_hang(false) -- + + else : + + llcorner multipar -- + lrcorner multipar -- + (xpart urcorner multipar, ypart urxy[fpos]) -- + %urxy[fpos] -- + snapped_multi_pos(urxy[fpos]) -- + lrxy[fpos] -- + (xpart ulcorner multipar, ypart lrxy[fpos]) -- + + fi cycle ; + + save_multipar (i,1,multipar) ; + + fi ; + + elseif (nxy[tpos]=RealPageNumber) and (InsideTextArea(i,llxy[tpos])) : + + % last one in chain + + nn := i ; + + if obey_multi_par_hang and obey_multi_par_more : + + multipar := + x_left_top_hang(i,true) -- + x_right_top_hang(i,true) -- + x_right_bottom_hang(i,true) -- +% ulxy[tpos] -- +snapped_multi_pos(ulxy[tpos]) -- + llxy[tpos] -- + x_left_bottom_hang(i,true) -- + cycle ; + + else : + + multipar := + ulcorner multipar -- + urcorner multipar -- + (xpart lrcorner multipar, ypart urxy[tpos]) -- +% ulxy[tpos] -- +snapped_multi_pos(ulxy[tpos]) -- + llxy[tpos] -- + (xpart llcorner multipar, ypart llxy[tpos]) -- + cycle ; + + fi ; + + save_multipar (i,3,multipar) ; + + else : + + % handled later + + fi ; + + endfor ; + + % second loop + + for i=ii+1 upto nn-1 : + + % rest of chain / todo : hang + +%if (nxy[fpos]<=RealPageNumber) and (nxy[tpos]>=RealPageNumber) : + + multipar := set_multipar(i) ; + + if obey_multi_par_hang and obey_multi_par_more : + + multipar := + x_left_top_hang(i,false) -- + x_right_top_hang(i,false) -- + x_right_bottom_hang(i,false) -- + x_left_bottom_hang(i,false) -- + cycle ; + + fi ; + + save_multipar(i,2,multipar) ; + +%fi ; + + endfor ; + + if span_multi_column_pars : + endgroup ; + fi ; + +enddef ; + +color boxgridcolor ; boxgridcolor := .8red ; +color boxlinecolor ; boxlinecolor := .8blue ; +color boxfillcolor ; boxfillcolor := .8white ; +numeric boxgridtype ; boxgridtype := 0 ; +numeric boxlinetype ; boxlinetype := 1 ; +numeric boxfilltype ; boxfilltype := 1 ; +pair boxgriddirection ; boxgriddirection := up ; +numeric boxgridwidth ; boxgridwidth := 1pt ; +numeric boxlinewidth ; boxlinewidth := 1pt ; +numeric boxlineradius ; boxlineradius := 0pt ; +numeric boxfilloffset ; boxfilloffset := 0pt ; +numeric boxgriddistance ; boxgriddistance := .5cm ; + +def draw_box = + draw pxy withcolor boxlinecolor withpen pencircle scaled boxlinewidth ; + draw lxy -- rxy withcolor boxlinecolor withpen pencircle scaled boxgridwidth ; +enddef ; + +def draw_par = % 1 2 11 12 + do_draw_par(pxy) ; do_draw_par(txy) ; do_draw_par(bxy) ; + for i = pxy, txy, bxy : + if boxgridtype= 1 : + boxgriddirection := origin ; + draw baseline_grid (i,boxgriddirection,true ) withcolor boxgridcolor ; + elseif boxgridtype= 2 : + boxgriddirection := origin ; + draw baseline_grid (i,boxgriddirection,false) withcolor boxgridcolor ; + elseif boxgridtype=11 : + draw graphic_grid(i,boxgriddistance,boxgriddistance,boxgriddistance/2,boxgriddistance/2) ; + elseif boxgridtype=12 : + draw graphic_grid(i,boxgriddistance,boxgriddistance,0,0) ; + fi ; + endfor ; +enddef ; + +def do_show_par (expr p, r, c) = + if length(p) > 2 : for i=0 upto length(p) : + draw fullcircle scaled r shifted point i of p + withpen pencircle scaled .5pt withcolor c ; + endfor ; fi ; + draw p withpen pencircle scaled .5pt withcolor c ; +enddef ; + +def show_par = + if length(mxy) > 2 : + draw mxy dashed evenly + withpen pencircle scaled .5pt withcolor .5white ; + fi ; + do_show_par(txy, 4pt, .5green) ; + do_show_par(bxy, 6pt, .5blue ) ; + do_show_par(pxy, 8pt, .5red ) ; + draw pref withpen pencircle scaled 2pt ; +enddef ; + +def draw_multi_pars = + for i=1 upto nofmultipars : + do_draw_par(multipars[i]) ; + if boxgridtype= 1 : + draw baseline_grid (multipars[i],up,true ) withcolor boxgridcolor ; + elseif boxgridtype= 2 : + draw baseline_grid (multipars[i],up,false) withcolor boxgridcolor ; + elseif boxgridtype=11 : + draw graphic_grid(multipars[i],boxgriddistance,boxgriddistance,boxgriddistance/2,boxgriddistance/2) ; + elseif boxgridtype=12 : + draw graphic_grid(multipars[i],boxgriddistance,boxgriddistance,0,0) ; + fi ; + endfor ; +enddef ; + +def show_multi_pars = + for i=1 upto nofmultipars : + do_show_par(multipars[i], 6pt, .5blue) ; + endfor ; +enddef ; + +vardef do_draw_par (expr p) = + if (length p>2) and (bbwidth(p)>1) and (bbheight(p)>1) : + save pp ; path pp ; + if (boxlineradius>0) and (boxlinetype=2) : + pp := p cornered boxlineradius ; + else : + pp := p ; + fi ; + if boxfilltype>0 : +if boxfilloffset>0 : + % temporary hack + begingroup ; interim linejoin := mitered ; + filldraw pp withcolor boxfillcolor withpen pencircle scaled (2*boxfilloffset) ; + endgroup ; +else : + fill pp withcolor boxfillcolor ; +fi ; + fi ; + if boxlinetype>0 : + draw pp withcolor boxlinecolor withpen pencircle scaled boxlinewidth ; + fi ; + fi ; +enddef ; + +vardef baseline_grid (expr pxy, pdir, at_baseline) = + if (par_line_height>0) and (bbheight(pxy)>1) and (bbwidth(pxy)>1) and (boxgridwidth>0) : + save i, grid ; picture grid ; pair start ; + def _do_ (expr start) = + draw start -- start shifted (bbwidth(pxy),0) + withpen pencircle scaled boxgridwidth + withcolor boxgridcolor ; + enddef ; + grid := image + ( %fails with inlinespace + % + if pdir=up : + for i = if at_baseline : par_strut_depth else : 0 fi + step par_line_height + until max(bbheight(pxy),par_line_height) : + _do_ (llcorner pxy shifted (0,+i)) ; + endfor ; + else : + for i = if at_baseline : par_strut_height else : 0 fi + step par_line_height + until bbheight(pxy) : + _do_ (ulcorner pxy shifted (0,-i)) ; + endfor ; + fi ; + ) ; + clip grid to pxy ; + grid + else : + nullpicture + fi +enddef ; + +vardef graphic_grid (expr pxy, dx, dy, x, y) = + if (bbheight(pxy)>dy) and (bbwidth(pxy)>dx) and (boxgridwidth>0) : + save grid ; picture grid ; + grid := image + ( for i = xpart llcorner pxy step dx until xpart lrcorner pxy : + draw (i,ypart llcorner pxy) -- (i,ypart ulcorner pxy) + withpen pencircle scaled boxgridwidth ; + endfor ; + for i = ypart llcorner pxy step dy until ypart ulcorner pxy : + draw (xpart llcorner pxy,i) -- (xpart lrcorner pxy,i) + withpen pencircle scaled boxgridwidth ; + endfor ) shifted (x,y) ; + clip grid to pxy ; + grid + else : + nullpicture + fi +enddef ; + +def anchor_box (expr n,x,y,w,h,d) = + currentpicture := currentpicture shifted (-x,-y) ; +enddef ; + +let draw_area = draw_box ; +let anchor_area = anchor_box ; +let anchor_par = anchor_box ; + +endinput ; |