if not modules then modules = { } end modules ['supp-mpl'] = { version = 1.001, comment = "companion to luatex-mplib.tex", author = "Hans Hagen & Taco Hoekwater", copyright = "ConTeXt Development Team", license = "public domain", } --[[ldx--
This module is a stripped down version of libraries that are used
by
Let's silently quit and make sure that no one loads it
manually in
We create a namespace and some variables to it. If a namespace is already defined it wil not be initialized. This permits hooking in code beforehand.
We don't make a format automatically. After all, distributions
might have their own preferences and normally a format (mem) file will
have some special place in the
A few helpers, taken from
We use the
You can use your own reported if needed, as long as it handles multiple arguments and formatted strings.
--ldx]]-- metapost.report = metapost.report or function(...) texio.write(format("The rest of this module is not documented. More info can be found in the
We removed some message and tracing code. We might even remove the flusher
--ldx]]-- local function pdf_startfigure(n,llx,lly,urx,ury) tex.sprint(format("\\startMPLIBtoPDF{%s}{%s}{%s}{%s}",llx,lly,urx,ury)) end local function pdf_stopfigure() tex.sprint("\\stopMPLIBtoPDF") end function pdf_literalcode(fmt,...) -- table tex.sprint(format("\\MPLIBtoPDF{%s}",format(fmt,...))) end function pdf_textfigure(font,size,text,width,height,depth) text = text:gsub(".","\\hbox{%1}") -- kerning happens in metapost tex.sprint(format("\\MPLIBtextext{%s}{%s}{%s}{%s}{%s}",font,size,text,0,-( 7200/ 7227)/65536*depth)) end local bend_tolerance = 131/65536 local rx, sx, sy, ry, tx, ty, divider = 1, 0, 0, 1, 0, 0, 1 local function pen_characteristics(object) if mplib.pen_info then local t = mplib.pen_info(object) rx, ry, sx, sy, tx, ty = t.rx, t.ry, t.sx, t.sy, t.tx, t.ty divider = sx*sy - rx*ry return not (sx==1 and rx==0 and ry==0 and sy==1 and tx==0 and ty==0), t.width else rx, sx, sy, ry, tx, ty, divider = 1, 0, 0, 1, 0, 0, 1 return false, 1 end end local function concat(px, py) -- no tx, ty here return (sy*px-ry*py)/divider,(sx*py-rx*px)/divider end local function curved(ith,pth) local d = pth.left_x - ith.right_x if abs(ith.right_x - ith.x_coord - d) <= bend_tolerance and abs(pth.x_coord - pth.left_x - d) <= bend_tolerance then d = pth.left_y - ith.right_y if abs(ith.right_y - ith.y_coord - d) <= bend_tolerance and abs(pth.y_coord - pth.left_y - d) <= bend_tolerance then return false end end return true end local function flushnormalpath(path,open) local pth, ith for i=1,#path do pth = path[i] if not ith then pdf_literalcode("%f %f m",pth.x_coord,pth.y_coord) elseif curved(ith,pth) then pdf_literalcode("%f %f %f %f %f %f c",ith.right_x,ith.right_y,pth.left_x,pth.left_y,pth.x_coord,pth.y_coord) else pdf_literalcode("%f %f l",pth.x_coord,pth.y_coord) end ith = pth end if not open then local one = path[1] if curved(pth,one) then pdf_literalcode("%f %f %f %f %f %f c",pth.right_x,pth.right_y,one.left_x,one.left_y,one.x_coord,one.y_coord ) else pdf_literalcode("%f %f l",one.x_coord,one.y_coord) end elseif #path == 1 then -- special case .. draw point local one = path[1] pdf_literalcode("%f %f l",one.x_coord,one.y_coord) end return t end local function flushconcatpath(path,open) pdf_literalcode("%f %f %f %f %f %f cm", sx, rx, ry, sy, tx ,ty) local pth, ith for i=1,#path do pth = path[i] if not ith then pdf_literalcode("%f %f m",concat(pth.x_coord,pth.y_coord)) elseif curved(ith,pth) then local a, b = concat(ith.right_x,ith.right_y) local c, d = concat(pth.left_x,pth.left_y) pdf_literalcode("%f %f %f %f %f %f c",a,b,c,d,concat(pth.x_coord, pth.y_coord)) else pdf_literalcode("%f %f l",concat(pth.x_coord, pth.y_coord)) end ith = pth end if not open then local one = path[1] if curved(pth,one) then local a, b = concat(pth.right_x,pth.right_y) local c, d = concat(one.left_x,one.left_y) pdf_literalcode("%f %f %f %f %f %f c",a,b,c,d,concat(one.x_coord, one.y_coord)) else pdf_literalcode("%f %f l",concat(one.x_coord,one.y_coord)) end elseif #path == 1 then -- special case .. draw point local one = path[1] pdf_literalcode("%f %f l",concat(one.x_coord,one.y_coord)) end return t end --[[ldx--Support for specials has been removed.
--ldx]]-- function metapost.flush(result,flusher) if result then local figures = result.fig if figures then for f=1, #figures do metapost.report("flushing figure %s",f) local figure = figures[f] local objects = getobjects(result,figure,f) local fignum = tonumber((figure:filename()):match("([%d]+)$") or figure:charcode() or 0) local miterlimit, linecap, linejoin, dashed = -1, -1, -1, false local bbox = figure:boundingbox() local llx, lly, urx, ury = bbox[1], bbox[2], bbox[3], bbox[4] -- faster than unpack if urx < llx then -- invalid pdf_startfigure(fignum,0,0,0,0) pdf_stopfigure() else pdf_startfigure(fignum,llx,lly,urx,ury) pdf_literalcode("q") if objects then for o=1,#objects do local object = objects[o] local objecttype = object.type if objecttype == "start_bounds" or objecttype == "stop_bounds" then -- skip elseif objecttype == "start_clip" then pdf_literalcode("q") flushnormalpath(object.path,t,false) pdf_literalcode("W n") elseif objecttype == "stop_clip" then pdf_literalcode("Q") miterlimit, linecap, linejoin, dashed = -1, -1, -1, false elseif objecttype == "special" then -- not supported elseif objecttype == "text" then local ot = object.transform -- 3,4,5,6,1,2 pdf_literalcode("q %f %f %f %f %f %f cm",ot[3],ot[4],ot[5],ot[6],ot[1],ot[2]) pdf_textfigure(object.font,object.dsize,object.text,object.width,object.height,object.depth) pdf_literalcode("Q") else local cs = object.color if cs and #cs > 0 then pdf_literalcode(metapost.colorconverter(cs)) end local ml = object.miterlimit if ml and ml ~= miterlimit then miterlimit = ml pdf_literalcode("%f M",ml) end local lj = object.linejoin if lj and lj ~= linejoin then linejoin = lj pdf_literalcode("%i j",lj) end local lc = object.linecap if lc and lc ~= linecap then linecap = lc pdf_literalcode("%i J",lc) end local dl = object.dash if dl then local d = format("[%s] %i d",concat(dl.dashes or {}," "),dl.offset) if d ~= dashed then dashed = d pdf_literalcode(dashed) end elseif dashed then pdf_literalcode("[] 0 d") dashed = false end local path = object.path local transformed, penwidth = false, 1 local open = path and path[1].left_type and path[#path].right_type local pen = object.pen if pen then if pen.type == 'elliptical' then transformed, penwidth = pen_characteristics(object) -- boolean, value pdf_literalcode("%f w",penwidth) if objecttype == 'fill' then objecttype = 'both' end else -- calculated by mplib itself objecttype = 'fill' end end if transformed then pdf_literalcode("q") end if path then if transformed then flushconcatpath(path,open) else flushnormalpath(path,open) end if objecttype == "fill" then pdf_literalcode("h f") elseif objecttype == "outline" then pdf_literalcode((open and "S") or "h S") elseif objecttype == "both" then pdf_literalcode("h B") end end if transformed then pdf_literalcode("Q") end local path = object.htap if path then if transformed then pdf_literalcode("q") end if transformed then flushconcatpath(path,open) else flushnormalpath(path,open) end if objecttype == "fill" then pdf_literalcode("h f") elseif objecttype == "outline" then pdf_literalcode((open and "S") or "h S") elseif objecttype == "both" then pdf_literalcode("h B") end if transformed then pdf_literalcode("Q") end end if cr then pdf_literalcode(cr) end end end end pdf_literalcode("Q") pdf_stopfigure() end end end end end function metapost.colorconverter(cr) local n = #cr if n == 4 then local c, m, y, k = cr[1], cr[2], cr[3], cr[4] return format("%.3f %.3f %.3f %.3f k %.3f %.3f %.3f %.3f K",c,m,y,k,c,m,y,k), "0 g 0 G" elseif n == 3 then local r, g, b = cr[1], cr[2], cr[3] return format("%.3f %.3f %.3f rg %.3f %.3f %.3f RG",r,g,b,r,g,b), "0 g 0 G" else local s = cr[1] return format("%.3f g %.3f G",s,s), "0 g 0 G" end end end