diff options
Diffstat (limited to 'tex/context/base/anch-pgr.lua')
| -rw-r--r-- | tex/context/base/anch-pgr.lua | 248 |
1 files changed, 133 insertions, 115 deletions
diff --git a/tex/context/base/anch-pgr.lua b/tex/context/base/anch-pgr.lua index bf4dcbe02..aba61794b 100644 --- a/tex/context/base/anch-pgr.lua +++ b/tex/context/base/anch-pgr.lua @@ -8,6 +8,8 @@ if not modules then modules = { } end modules ['anch-pgr'] = { -- todo: we need to clean up lists (of previous pages) +local commands, context = commands, context + local format = string.format local abs = math.abs local concat, sort = table.concat, table.sort @@ -47,34 +49,48 @@ end local eps = 2 -local function add(t,x,y,last) +local function add(t,x,y,last,direction) local n = #t if n == 0 then t[n+1] = { x, y } - elseif n == 1 then - local tn = t[1] - if abs(tn[1]-x) <= eps or abs(tn[2]-y) <= eps then - t[n+1] = { x, y } - end else - local tm = t[n-1] local tn = t[n] local lx = tn[1] local ly = tn[2] - if abs(lx-tm[1]) <= eps and abs(lx-x) <= eps then - if abs(ly-y) > eps then - tn[2] = y + if x == lx and y == ly then + -- quick skip + elseif n == 1 then +-- if abs(lx-x) <= eps or abs(ly-y) <= eps then + if abs(lx-x) > eps or abs(ly-y) > eps then + t[n+1] = { x, y } end - elseif abs(ly-tm[2]) <= eps and abs(ly-y) <= eps then - if abs(lx-x) > eps then - tn[1] = x + else + local tm = t[n-1] + local px = tm[1] + local py = tm[2] +if (direction == "down" and y > ly) or (direction == "up" and y < ly) then + -- move back from too much hang +else + if abs(lx-px) <= eps and abs(lx-x) <= eps then + if abs(ly-y) > eps then + tn[2] = y + end + elseif abs(ly-py) <= eps and abs(ly-y) <= eps then + if abs(lx-x) > eps then + tn[1] = x + end + elseif not last then + t[n+1] = { x, y } end - elseif not last then - t[n+1] = { x, y } +end end end end +-- local function add(t,x,y,last) +-- t[#t+1] = { x, y } +-- end + local function finish(t) local n = #t if n > 1 then @@ -109,105 +125,103 @@ end -- todo: mark regions and free paragraphs in collected -local function shapes(r,rx,ry,rw,rh,rd,lytop,lybot,rytop,rybot) +local function shapes(r,rx,ry,rw,rh,rd,lytop,lybot,rytop,rybot,obeyhang) -- we assume that we only hang per page and not cross pages -- which makes sense as hanging is only uses in special cases -- -- we can remove data as soon as a page is done so we could -- remember per page and discard areas after each shipout local leftshape, rightshape --- leftshape = r.leftshape --- rightshape = r.rightshape --- if not leftshape then - leftshape = { { rx, rh } } - rightshape = { { rw, rh } } - local paragraphs = r.paragraphs - local extending = false - if paragraphs then - for i=1,#paragraphs do - local p = paragraphs[i] - local ha = p.ha - if ha and ha ~= 0 then + leftshape = { { rx, rh } } -- spikes get removed so we can start at the edge + rightshape = { { rw, rh } } -- even if we hang next + local paragraphs = r.paragraphs + local extending = false + if paragraphs then + for i=1,#paragraphs do + local p = paragraphs[i] + local ha = p.ha + if obeyhang and ha and ha ~= 0 then + local py = p.y + local ph = p.h + local pd = p.d + local hi = p.hi + local hang = ha * (ph + pd) + local py_ph = py + ph + -- ha < 0 hi < 0 : right top + -- ha < 0 hi > 0 : left top + if ha < 0 then + if hi < 0 then -- right + add(rightshape,rw, py_ph,"up") + add(rightshape,rw + hi,py_ph,"up") + add(rightshape,rw + hi,py_ph + hang,"up") + add(rightshape,rw, py_ph + hang,"up") + else + -- left + add(leftshape,rx,py_ph,"down") + add(leftshape,rx + hi,py_ph,"down") + add(leftshape,rx + hi,py_ph + hang,"down") + add(leftshape,rx,py_ph + hang,"down") + end + else + -- maybe some day + end + extending = true -- false + else -- we need to clip to the next par + local ps = p.ps + if ps then local py = p.y local ph = p.h local pd = p.d - local hi = p.hi - local hang = ha * (ph + pd) + local step = ph + pd + local size = #ps * step local py_ph = py + ph - -- ha < 0 hi < 0 : right top - -- ha < 0 hi > 0 : left top - if ha < 0 then - if hi < 0 then -- right - add(rightshape,rw , py_ph) - add(rightshape,rw + hi, py_ph) - add(rightshape,rw + hi, py_ph + hang) - add(rightshape,rw , py_ph + hang) - else - -- left - add(leftshape,rx, py_ph) - add(leftshape,rx + hi, py_ph) - add(leftshape,rx + hi, py_ph + hang) - add(leftshape,rx, py_ph + hang) - end - end -extending = false - else -- we need to clip to the next par - local ps = p.ps - if ps then - local py = p.y - local ph = p.h - local pd = p.d - local step = ph + pd - local size = #ps * step - local py_ph = py + ph - add(leftshape,rx,py_ph) - add(rightshape,rw,py_ph) - for i=1,#ps do - local p = ps[i] - local l = p[1] - local w = p[2] - add(leftshape,rx + l, py_ph) - add(rightshape,rx + l + w, py_ph) - py_ph = py_ph - step - add(leftshape,rx + l, py_ph) - add(rightshape,rx + l + w, py_ph) - end - extending = true --- add(left,rx,py_ph) --- add(right,rw,py_ph) - else - if extending then - local py = p.y - local ph = p.h - local pd = p.d - local py_ph = py + ph - local py_pd = py - pd - add(leftshape,leftshape[#leftshape][1],py_ph) - add(rightshape,rightshape[#rightshape][1],py_ph) - add(leftshape,rx,py_ph) - add(rightshape,rw,py_ph) -extending = false - end + add(leftshape,rx,py_ph,"up") + add(rightshape,rw,py_ph,"down") + for i=1,#ps do + local p = ps[i] + local l = p[1] + local w = p[2] + add(leftshape,rx + l, py_ph,"up") + add(rightshape,rx + l + w, py_ph,"down") + py_ph = py_ph - step + add(leftshape,rx + l, py_ph,"up") + add(rightshape,rx + l + w, py_ph,"down") end + extending = true + elseif extending then + local py = p.y + local ph = p.h + local pd = p.d + local py_ph = py + ph + local py_pd = py - pd + add(leftshape,leftshape[#leftshape][1],py_ph,"up") + add(rightshape,rightshape[#rightshape][1],py_ph,"down") + add(leftshape,rx,py_ph,"up") -- shouldn't this be py_pd + add(rightshape,rw,py_ph,"down") -- shouldn't this be py_pd + extending = false end end end - -- we can have a simple variant when no paragraphs - if extending then - -- not ok - leftshape[#leftshape][2] = rd - rightshape[#rightshape][2] = rw - else - add(leftshape,rx,rd) - add(rightshape,rw,rd) - end --- r.leftshape = leftshape --- r.rightshape = rightshape --- end + end + -- we can have a simple variant when no paragraphs + if extending then + -- not ok + leftshape[#leftshape][2] = rd + rightshape[#rightshape][2] = rw + else + add(leftshape,rx,rd,"up") + add(rightshape,rw,rd,"down") + end return clip(leftshape,lytop,lybot), clip(rightshape,rytop,rybot) end -local function singlepart(b,e,r,left,right) +-- local function shapes(r,rx,ry,rw,rh,rd,lytop,lybot,rytop,rybot,obeyhang) +-- local leftshape = { { rx, rh }, { rx, rd } } +-- local rightshape = { { rw, rh }, { rw, rd } } +-- return clip(leftshape,lytop,lybot), clip(rightshape,rytop,rybot) +-- end + +local function singlepart(b,e,r,left,right,obeyhang) local bx, by = b.x, b.y local ex, ey = e.x, e.y local rx, ry = r.x, r.y @@ -238,7 +252,7 @@ local function singlepart(b,e,r,left,right) } else area = { } - local leftshapes, rightshapes = shapes(r,rx,ry,rw,rh,rd,bd,ed,bh,eh) + local leftshapes, rightshapes = shapes(r,rx,ry,rw,rh,rd,bd,ed,bh,eh,obeyhang) add(area,bx,bh-ry) for i=1,#rightshapes do local ri = rightshapes[i] @@ -265,7 +279,7 @@ local function singlepart(b,e,r,left,right) } end -local function firstpart(b,r,left,right) +local function firstpart(b,r,left,right,obeyhang) local bx, by = b.x, b.y local rx, ry = r.x, r.y local rw = rx + r.w @@ -278,7 +292,7 @@ local function firstpart(b,r,left,right) local bh = by + b.h local bd = by - b.d local area = { } - local leftshapes, rightshapes = shapes(r,rx,ry,rw,rh,rd,bd,rd,bh,rd) + local leftshapes, rightshapes = shapes(r,rx,ry,rw,rh,rd,bd,rd,bh,rd,obeyhang) add(area,bx,bh-ry) for i=1,#rightshapes do local ri = rightshapes[i] @@ -302,7 +316,7 @@ local function firstpart(b,r,left,right) } end -local function middlepart(r,left,right) +local function middlepart(r,left,right,obeyhang) local rx, ry = r.x, r.y local rw = rx + r.w local rh = ry + r.h @@ -312,7 +326,7 @@ local function middlepart(r,left,right) rw = rw - right end local area = { } - local leftshapes, rightshapes = shapes(r,rx,ry,rw,rh,rd,rh,rd,rh,rd) + local leftshapes, rightshapes = shapes(r,rx,ry,rw,rh,rd,rh,rd,rh,rd,obeyhang) for i=#leftshapes,1,-1 do local li = leftshapes[i] add(area,li[1],li[2]-ry) @@ -333,7 +347,7 @@ local function middlepart(r,left,right) } end -local function lastpart(e,r,left,right) +local function lastpart(e,r,left,right,obeyhang) local ex, ey = e.x, e.y local rx, ry = r.x, r.y local rw = rx + r.w @@ -347,7 +361,7 @@ local function lastpart(e,r,left,right) local ed = ey - e.d local area = { } -- two cases: till end and halfway e line - local leftshapes, rightshapes = shapes(r,rx,ry,rw,rh,rd,rh,ed,rh,eh) + local leftshapes, rightshapes = shapes(r,rx,ry,rw,rh,rd,rh,ed,rh,eh,obeyhang) for i=1,#rightshapes do local ri = rightshapes[i] add(area,ri[1],ri[2]-ry) @@ -375,7 +389,7 @@ local backgrounds = { } graphics.backgrounds = backgrounds -local function calculatemultipar(tag) +local function calculatemultipar(tag,obeyhang) local collected = jobpositions.collected local b = collected[format("b:%s",tag)] local e = collected[format("e:%s",tag)] @@ -429,13 +443,13 @@ local function calculatemultipar(tag) -- if bindex == eindex then return { - list = { [b.p] = { singlepart(b,e,collected[br],left,right) } }, + list = { [b.p] = { singlepart(b,e,collected[br],left,right,obeyhang) } }, bpos = b, epos = e, } else local list = { - [b.p] = { firstpart(b,collected[br],left,right) }, + [b.p] = { firstpart(b,collected[br],left,right,obeyhang) }, } for i=bindex+1,eindex-1 do br = format("%s:%s",btag,i) @@ -446,18 +460,18 @@ local function calculatemultipar(tag) local p = r.p local pp = list[p] if pp then - pp[#pp+1] = middlepart(r,left,right) + pp[#pp+1] = middlepart(r,left,right,obeyhang) else - list[p] = { middlepart(r,left,right) } + list[p] = { middlepart(r,left,right,obeyhang) } end end end local p = e.p local pp = list[p] if pp then - pp[#pp+1] = lastpart(e,collected[er],left,right) + pp[#pp+1] = lastpart(e,collected[er],left,right,obeyhang) else - list[p] = { lastpart(e,collected[er],left,right) } + list[p] = { lastpart(e,collected[er],left,right,obeyhang) } end return { list = list, @@ -537,10 +551,10 @@ local template_d = [[ setbounds currentpicture to multibox ; ]] -function backgrounds.fetchmultipar(n,anchor,page) +function backgrounds.fetchmultipar(n,anchor,page,obeyhang) local data = pbg[n] if not data then - data = calculatemultipar(n) + data = calculatemultipar(n,obeyhang) pbg[n] = data -- can be replaced by register -- register(data.list,n,anchor) end @@ -590,6 +604,10 @@ function commands.fetchmultipar(n,anchor,page) context(backgrounds.fetchmultipar(n,anchor,page)) end +function commands.fetchmultishape(n,anchor,page) + context(backgrounds.fetchmultipar(n,anchor,page,true)) +end + local template_a = [[ path posboxes[], posregions[] ; numeric pospages[] ; @@ -642,10 +660,10 @@ end local doifelse = commands.doifelse -function commands.doifelsemultipar(n,page) +function commands.doifelsemultipar(n,page,obeyhang) local data = pbg[n] if not data then - data = calculatemultipar(n) + data = calculatemultipar(n,obeyhang) pbg[n] = data end if page then |