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-rw-r--r--tex/context/base/mlib-pdf.lua1060
1 files changed, 530 insertions, 530 deletions
diff --git a/tex/context/base/mlib-pdf.lua b/tex/context/base/mlib-pdf.lua
index 963309951..6ca50a12f 100644
--- a/tex/context/base/mlib-pdf.lua
+++ b/tex/context/base/mlib-pdf.lua
@@ -1,530 +1,530 @@
-if not modules then modules = { } end modules ['mlib-pdf'] = {
- version = 1.001,
- comment = "companion to mlib-ctx.mkiv",
- author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
- copyright = "PRAGMA ADE / ConTeXt Development Team",
- license = "see context related readme files",
-}
-
--- maybe %s is better than %f
-
-local format, concat, gsub = string.format, table.concat, string.gsub
-local abs, sqrt, round = math.abs, math.sqrt, math.round
-local setmetatable = setmetatable
-local Cf, C, Cg, Ct, P, S, lpegmatch = lpeg.Cf, lpeg.C, lpeg.Cg, lpeg.Ct, lpeg.P, lpeg.S, lpeg.match
-local formatters = string.formatters
-
-local report_metapost = logs.reporter("metapost")
-
-local mplib, context = mplib, context
-
-local allocate = utilities.storage.allocate
-
-local copy_node = node.copy
-local write_node = node.write
-
-metapost = metapost or { }
-local metapost = metapost
-
-metapost.flushers = metapost.flushers or { }
-local pdfflusher = { }
-metapost.flushers.pdf = pdfflusher
-
-metapost.multipass = false
-metapost.n = 0
-metapost.optimize = true -- false
-
-local experiment = true -- uses context(node) that already does delayed nodes
-
-local savedliterals = nil -- needs checking
-local mpsliteral = nodes.pool.register(node.new("whatsit",nodes.whatsitcodes.pdfliteral)) -- pdfliteral.mode = 1
-
-local pdfliteral = function(s)
- local literal = copy_node(mpsliteral)
- literal.data = s
- return literal
-end
-
--- Because in MKiV we always have two passes, we save the objects. When an extra
--- mp run is done (due to for instance texts identifier in the parse pass), we
--- get a new result table and the stored objects are forgotten. Otherwise they
--- are reused.
-
-local function getobjects(result,figure,f)
- if metapost.optimize then
- local objects = result.objects
- if not objects then
- result.objects = { }
- end
- objects = result.objects[f]
- if not objects then
- objects = figure:objects()
- result.objects[f] = objects
- end
- return objects
- else
- return figure:objects()
- end
-end
-
-function metapost.convert(result, trialrun, flusher, multipass, askedfig)
- if trialrun then
- metapost.multipass = false
- metapost.parse(result, askedfig)
- if multipass and not metapost.multipass and metapost.optimize then
- metapost.flush(result, flusher, askedfig) -- saves a run
- else
- return false
- end
- else
- metapost.flush(result, flusher, askedfig)
- end
- return true -- done
-end
-
-function metapost.flushliteral(d)
- if savedliterals then
- local literal = copy_node(mpsliteral)
- literal.data = savedliterals[d]
- write_node(literal)
- else
- report_metapost("problem flushing literal %a",d)
- end
-end
-
-function metapost.flushreset() -- will become obsolete and internal
- savedliterals = nil
-end
-
-function pdfflusher.comment(message)
- if message then
- message = formatters["%% mps graphic %s: %s"](metapost.n,message)
- if experiment then
- context(pdfliteral(message))
- else
- if savedliterals then
- local last = #savedliterals + 1
- savedliterals[last] = message
- context.MPLIBtoPDF(last)
- else
- savedliterals = { message }
- context.MPLIBtoPDF(1)
- end
- end
- end
-end
-
-function pdfflusher.startfigure(n,llx,lly,urx,ury,message)
- savedliterals = nil
- metapost.n = metapost.n + 1
- context.startMPLIBtoPDF(llx,lly,urx,ury)
- if message then pdfflusher.comment(message) end
-end
-
-function pdfflusher.stopfigure(message)
- if message then pdfflusher.comment(message) end
- context.stopMPLIBtoPDF()
- context.MPLIBflushreset() -- maybe just at the beginning
-end
-
-function pdfflusher.flushfigure(pdfliterals) -- table
- if #pdfliterals > 0 then
- pdfliterals = concat(pdfliterals,"\n")
- if experiment then
- context(pdfliteral(pdfliterals))
- else
- if savedliterals then
- local last = #savedliterals + 1
- savedliterals[last] = pdfliterals
- context.MPLIBtoPDF(last)
- else
- savedliterals = { pdfliterals }
- context.MPLIBtoPDF(1)
- end
- end
- end
-end
-
-function pdfflusher.textfigure(font,size,text,width,height,depth) -- we could save the factor
- text = gsub(text,".","\\hbox{%1}") -- kerning happens in metapost (i have to check if this is true for mplib)
- context.MPtextext(font,size,text,0,-number.dimenfactors.bp*depth)
-end
-
-local bend_tolerance = 131/65536
-
-local rx, sx, sy, ry, tx, ty, divider = 1, 0, 0, 1, 0, 0, 1
-
-local pen_info = mplib.pen_info
-
-local function pen_characteristics(object)
- local t = 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
-end
-
-local function mpconcat(px, py) -- no tx, ty here / we can move this one inline if needed
- 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, t, open)
- local pth, ith, nt
- if t then
- nt = #t
- else
- t = { }
- nt = 0
- end
- for i=1,#path do
- nt = nt + 1
- pth = path[i]
- if not ith then
- t[nt] = formatters["%f %f m"](pth.x_coord,pth.y_coord)
- elseif curved(ith,pth) then
- t[nt] = formatters["%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
- t[nt] = formatters["%f %f l"](pth.x_coord,pth.y_coord)
- end
- ith = pth
- end
- if not open then
- nt = nt + 1
- local one = path[1]
- if curved(pth,one) then
- t[nt] = formatters["%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
- t[nt] = formatters["%f %f l"](one.x_coord,one.y_coord)
- end
- elseif #path == 1 then
- -- special case .. draw point
- local one = path[1]
- nt = nt + 1
- t[nt] = formatters["%f %f l"](one.x_coord,one.y_coord)
- end
- return t
-end
-
-local function flushconcatpath(path, t, open)
- local pth, ith, nt
- if t then
- nt = #t
- else
- t = { }
- nt = 0
- end
- nt = nt + 1
- t[nt] = formatters["%f %f %f %f %f %f cm"](sx,rx,ry,sy,tx,ty)
- for i=1,#path do
- nt = nt + 1
- pth = path[i]
- if not ith then
- t[nt] = formatters["%f %f m"](mpconcat(pth.x_coord,pth.y_coord))
- elseif curved(ith,pth) then
- local a, b = mpconcat(ith.right_x,ith.right_y)
- local c, d = mpconcat(pth.left_x,pth.left_y)
- t[nt] = formatters["%f %f %f %f %f %f c"](a,b,c,d,mpconcat(pth.x_coord,pth.y_coord))
- else
- t[nt] = formatters["%f %f l"](mpconcat(pth.x_coord, pth.y_coord))
- end
- ith = pth
- end
- if not open then
- nt = nt + 1
- local one = path[1]
- if curved(pth,one) then
- local a, b = mpconcat(pth.right_x,pth.right_y)
- local c, d = mpconcat(one.left_x,one.left_y)
- t[nt] = formatters["%f %f %f %f %f %f c"](a,b,c,d,mpconcat(one.x_coord, one.y_coord))
- else
- t[nt] = formatters["%f %f l"](mpconcat(one.x_coord,one.y_coord))
- end
- elseif #path == 1 then
- -- special case .. draw point
- nt = nt + 1
- local one = path[1]
- t[nt] = formatters["%f %f l"](mpconcat(one.x_coord,one.y_coord))
- end
- return t
-end
-
-metapost.flushnormalpath = flushnormalpath
-
--- The flusher is pdf based, if another backend is used, we need to overload the
--- flusher; this is beta code, the organization will change (already upgraded in
--- sync with mplib)
---
--- We can avoid the before table but I like symmetry. There is of course a small
--- performance penalty, but so is passing extra arguments (result, flusher, after)
--- and returning stuff.
-
-local function ignore() end
-
-function metapost.flush(result,flusher,askedfig)
- if result then
- local figures = result.fig
- if figures then
- flusher = flusher or pdfflusher
- local resetplugins = metapost.resetplugins or ignore -- before figure
- local processplugins = metapost.processplugins or ignore -- each object
- local synchronizeplugins = metapost.synchronizeplugins or ignore
- local pluginactions = metapost.pluginactions or ignore -- before / after
- local startfigure = flusher.startfigure
- local stopfigure = flusher.stopfigure
- local flushfigure = flusher.flushfigure
- local textfigure = flusher.textfigure
- for f=1, #figures do
- local figure = figures[f]
- local objects = getobjects(result,figure,f)
- local fignum = figure:charcode() or 0
- if askedfig == "direct" or askedfig == "all" or askedfig == fignum then
- local t = { }
- 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]
- metapost.llx = llx
- metapost.lly = lly
- metapost.urx = urx
- metapost.ury = ury
- if urx < llx then
- -- invalid
- startfigure(fignum,0,0,0,0,"invalid",figure)
- stopfigure()
- else
- startfigure(fignum,llx,lly,urx,ury,"begin",figure)
- t[#t+1] = "q"
- if objects then
- resetplugins(t) -- we should move the colorinitializer here
- for o=1,#objects do
- local object = objects[o]
- local objecttype = object.type
- if objecttype == "start_bounds" or objecttype == "stop_bounds" or objecttype == "special" then
- -- skip
- elseif objecttype == "start_clip" then
- t[#t+1] = "q"
- flushnormalpath(object.path,t,false)
- t[#t+1] = "W n"
- elseif objecttype == "stop_clip" then
- t[#t+1] = "Q"
- miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
- elseif objecttype == "text" then
- t[#t+1] = "q"
- local ot = object.transform -- 3,4,5,6,1,2
- t[#t+1] = formatters["%f %f %f %f %f %f cm"](ot[3],ot[4],ot[5],ot[6],ot[1],ot[2]) -- TH: formatters["%f %f m %f %f %f %f 0 0 cm"](unpack(ot))
- flushfigure(t) -- flush accumulated literals
- t = { }
- textfigure(object.font,object.dsize,object.text,object.width,object.height,object.depth)
- t[#t+1] = "Q"
- else
- -- we use an indirect table as we want to overload
- -- entries but this is not possible in userdata
- --
- -- can be optimized if no path
- --
- local original = object
- local object = { }
- setmetatable(object, {
- __index = original
- })
- -- first we analyze
- local before, after = processplugins(object)
- local objecttype = object.type -- can have changed
- if before then
- t = pluginactions(before,t,flushfigure)
- end
- local ml = object.miterlimit
- if ml and ml ~= miterlimit then
- miterlimit = ml
- t[#t+1] = formatters["%f M"](ml)
- end
- local lj = object.linejoin
- if lj and lj ~= linejoin then
- linejoin = lj
- t[#t+1] = formatters["%i j"](lj)
- end
- local lc = object.linecap
- if lc and lc ~= linecap then
- linecap = lc
- t[#t+1] = formatters["%i J"](lc)
- end
- local dl = object.dash
- if dl then
- local d = formatters["[%s] %f d"](concat(dl.dashes or {}," "),dl.offset)
- if d ~= dashed then
- dashed = d
- t[#t+1] = dashed
- end
- elseif dashed then
- t[#t+1] = "[] 0 d"
- dashed = false
- end
- local path = object.path -- newpath
- local transformed, penwidth = false, 1
- local open = path and path[1].left_type and path[#path].right_type -- at this moment only "end_point"
- local pen = object.pen
- if pen then
- if pen.type == 'elliptical' then
- transformed, penwidth = pen_characteristics(original) -- boolean, value
- t[#t+1] = formatters["%f w"](penwidth) -- todo: only if changed
- if objecttype == 'fill' then
- objecttype = 'both'
- end
- else -- calculated by mplib itself
- objecttype = 'fill'
- end
- end
- if transformed then
- t[#t+1] = "q"
- end
- if path then
- if transformed then
- flushconcatpath(path,t,open)
- else
- flushnormalpath(path,t,open)
- end
- if objecttype == "fill" then
- t[#t+1] = "h f"
- elseif objecttype == "outline" then
- t[#t+1] = (open and "S") or "h S"
- elseif objecttype == "both" then
- t[#t+1] = "h B"
- end
- end
- if transformed then
- t[#t+1] = "Q"
- end
- local path = object.htap
- if path then
- if transformed then
- t[#t+1] = "q"
- end
- if transformed then
- flushconcatpath(path,t,open)
- else
- flushnormalpath(path,t,open)
- end
- if objecttype == "fill" then
- t[#t+1] = "h f"
- elseif objecttype == "outline" then
- t[#t+1] = (open and "S") or "h S"
- elseif objecttype == "both" then
- t[#t+1] = "h B"
- end
- if transformed then
- t[#t+1] = "Q"
- end
- end
- if after then
- t = pluginactions(after,t,flushfigure)
- end
- if object.grouped then
- -- can be qQ'd so changes can end up in groups
- miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
- end
- end
- end
- end
- t[#t+1] = "Q"
- flushfigure(t)
- stopfigure("end")
- end
- if askedfig ~= "all" then
- break
- end
- end
- end
- end
- end
-end
-
-function metapost.parse(result,askedfig)
- if result then
- local figures = result.fig
- if figures then
- local analyzeplugins = metapost.analyzeplugins -- each object
- for f=1,#figures do
- local figure = figures[f]
- local fignum = figure:charcode() or 0
- if askedfig == "direct" or askedfig == "all" or askedfig == fignum then
- local bbox = figure:boundingbox()
- metapost.llx = bbox[1]
- metapost.lly = bbox[2]
- metapost.urx = bbox[3]
- metapost.ury = bbox[4]
- local objects = getobjects(result,figure,f)
- if objects then
- for o=1,#objects do
- analyzeplugins(objects[o])
- end
- end
- if askedfig ~= "all" then
- break
- end
- end
- end
- end
- end
-end
-
--- tracing:
-
-local t = { }
-
-local flusher = {
- startfigure = function()
- t = { }
- context.startnointerference()
- end,
- flushfigure = function(literals)
- local n = #t
- for i=1, #literals do
- n = n + 1
- t[n] = literals[i]
- end
- end,
- stopfigure = function()
- context.stopnointerference()
- end
-}
-
-function metapost.pdfliterals(result)
- metapost.flush(result,flusher)
- return t
-end
-
--- so far
-
-function metapost.totable(result)
- local figure = result and result.fig and result.fig[1]
- if figure then
- local t = { }
- local objects = figure:objects()
- for o=1,#objects do
- local object = objects[o]
- local tt = { }
- local fields = mplib.fields(object)
- for f=1,#fields do
- local field = fields[f]
- tt[field] = object[field]
- end
- t[o] = tt
- end
- local b = figure:boundingbox()
- return {
- boundingbox = { llx = b[1], lly = b[2], urx = b[3], ury = b[4] },
- objects = t
- }
- else
- return nil
- end
-end
+if not modules then modules = { } end modules ['mlib-pdf'] = {
+ version = 1.001,
+ comment = "companion to mlib-ctx.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files",
+}
+
+-- maybe %s is better than %f
+
+local format, concat, gsub = string.format, table.concat, string.gsub
+local abs, sqrt, round = math.abs, math.sqrt, math.round
+local setmetatable = setmetatable
+local Cf, C, Cg, Ct, P, S, lpegmatch = lpeg.Cf, lpeg.C, lpeg.Cg, lpeg.Ct, lpeg.P, lpeg.S, lpeg.match
+local formatters = string.formatters
+
+local report_metapost = logs.reporter("metapost")
+
+local mplib, context = mplib, context
+
+local allocate = utilities.storage.allocate
+
+local copy_node = node.copy
+local write_node = node.write
+
+metapost = metapost or { }
+local metapost = metapost
+
+metapost.flushers = metapost.flushers or { }
+local pdfflusher = { }
+metapost.flushers.pdf = pdfflusher
+
+metapost.multipass = false
+metapost.n = 0
+metapost.optimize = true -- false
+
+local experiment = true -- uses context(node) that already does delayed nodes
+
+local savedliterals = nil -- needs checking
+local mpsliteral = nodes.pool.register(node.new("whatsit",nodes.whatsitcodes.pdfliteral)) -- pdfliteral.mode = 1
+
+local pdfliteral = function(s)
+ local literal = copy_node(mpsliteral)
+ literal.data = s
+ return literal
+end
+
+-- Because in MKiV we always have two passes, we save the objects. When an extra
+-- mp run is done (due to for instance texts identifier in the parse pass), we
+-- get a new result table and the stored objects are forgotten. Otherwise they
+-- are reused.
+
+local function getobjects(result,figure,f)
+ if metapost.optimize then
+ local objects = result.objects
+ if not objects then
+ result.objects = { }
+ end
+ objects = result.objects[f]
+ if not objects then
+ objects = figure:objects()
+ result.objects[f] = objects
+ end
+ return objects
+ else
+ return figure:objects()
+ end
+end
+
+function metapost.convert(result, trialrun, flusher, multipass, askedfig)
+ if trialrun then
+ metapost.multipass = false
+ metapost.parse(result, askedfig)
+ if multipass and not metapost.multipass and metapost.optimize then
+ metapost.flush(result, flusher, askedfig) -- saves a run
+ else
+ return false
+ end
+ else
+ metapost.flush(result, flusher, askedfig)
+ end
+ return true -- done
+end
+
+function metapost.flushliteral(d)
+ if savedliterals then
+ local literal = copy_node(mpsliteral)
+ literal.data = savedliterals[d]
+ write_node(literal)
+ else
+ report_metapost("problem flushing literal %a",d)
+ end
+end
+
+function metapost.flushreset() -- will become obsolete and internal
+ savedliterals = nil
+end
+
+function pdfflusher.comment(message)
+ if message then
+ message = formatters["%% mps graphic %s: %s"](metapost.n,message)
+ if experiment then
+ context(pdfliteral(message))
+ else
+ if savedliterals then
+ local last = #savedliterals + 1
+ savedliterals[last] = message
+ context.MPLIBtoPDF(last)
+ else
+ savedliterals = { message }
+ context.MPLIBtoPDF(1)
+ end
+ end
+ end
+end
+
+function pdfflusher.startfigure(n,llx,lly,urx,ury,message)
+ savedliterals = nil
+ metapost.n = metapost.n + 1
+ context.startMPLIBtoPDF(llx,lly,urx,ury)
+ if message then pdfflusher.comment(message) end
+end
+
+function pdfflusher.stopfigure(message)
+ if message then pdfflusher.comment(message) end
+ context.stopMPLIBtoPDF()
+ context.MPLIBflushreset() -- maybe just at the beginning
+end
+
+function pdfflusher.flushfigure(pdfliterals) -- table
+ if #pdfliterals > 0 then
+ pdfliterals = concat(pdfliterals,"\n")
+ if experiment then
+ context(pdfliteral(pdfliterals))
+ else
+ if savedliterals then
+ local last = #savedliterals + 1
+ savedliterals[last] = pdfliterals
+ context.MPLIBtoPDF(last)
+ else
+ savedliterals = { pdfliterals }
+ context.MPLIBtoPDF(1)
+ end
+ end
+ end
+end
+
+function pdfflusher.textfigure(font,size,text,width,height,depth) -- we could save the factor
+ text = gsub(text,".","\\hbox{%1}") -- kerning happens in metapost (i have to check if this is true for mplib)
+ context.MPtextext(font,size,text,0,-number.dimenfactors.bp*depth)
+end
+
+local bend_tolerance = 131/65536
+
+local rx, sx, sy, ry, tx, ty, divider = 1, 0, 0, 1, 0, 0, 1
+
+local pen_info = mplib.pen_info
+
+local function pen_characteristics(object)
+ local t = 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
+end
+
+local function mpconcat(px, py) -- no tx, ty here / we can move this one inline if needed
+ 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, t, open)
+ local pth, ith, nt
+ if t then
+ nt = #t
+ else
+ t = { }
+ nt = 0
+ end
+ for i=1,#path do
+ nt = nt + 1
+ pth = path[i]
+ if not ith then
+ t[nt] = formatters["%f %f m"](pth.x_coord,pth.y_coord)
+ elseif curved(ith,pth) then
+ t[nt] = formatters["%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
+ t[nt] = formatters["%f %f l"](pth.x_coord,pth.y_coord)
+ end
+ ith = pth
+ end
+ if not open then
+ nt = nt + 1
+ local one = path[1]
+ if curved(pth,one) then
+ t[nt] = formatters["%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
+ t[nt] = formatters["%f %f l"](one.x_coord,one.y_coord)
+ end
+ elseif #path == 1 then
+ -- special case .. draw point
+ local one = path[1]
+ nt = nt + 1
+ t[nt] = formatters["%f %f l"](one.x_coord,one.y_coord)
+ end
+ return t
+end
+
+local function flushconcatpath(path, t, open)
+ local pth, ith, nt
+ if t then
+ nt = #t
+ else
+ t = { }
+ nt = 0
+ end
+ nt = nt + 1
+ t[nt] = formatters["%f %f %f %f %f %f cm"](sx,rx,ry,sy,tx,ty)
+ for i=1,#path do
+ nt = nt + 1
+ pth = path[i]
+ if not ith then
+ t[nt] = formatters["%f %f m"](mpconcat(pth.x_coord,pth.y_coord))
+ elseif curved(ith,pth) then
+ local a, b = mpconcat(ith.right_x,ith.right_y)
+ local c, d = mpconcat(pth.left_x,pth.left_y)
+ t[nt] = formatters["%f %f %f %f %f %f c"](a,b,c,d,mpconcat(pth.x_coord,pth.y_coord))
+ else
+ t[nt] = formatters["%f %f l"](mpconcat(pth.x_coord, pth.y_coord))
+ end
+ ith = pth
+ end
+ if not open then
+ nt = nt + 1
+ local one = path[1]
+ if curved(pth,one) then
+ local a, b = mpconcat(pth.right_x,pth.right_y)
+ local c, d = mpconcat(one.left_x,one.left_y)
+ t[nt] = formatters["%f %f %f %f %f %f c"](a,b,c,d,mpconcat(one.x_coord, one.y_coord))
+ else
+ t[nt] = formatters["%f %f l"](mpconcat(one.x_coord,one.y_coord))
+ end
+ elseif #path == 1 then
+ -- special case .. draw point
+ nt = nt + 1
+ local one = path[1]
+ t[nt] = formatters["%f %f l"](mpconcat(one.x_coord,one.y_coord))
+ end
+ return t
+end
+
+metapost.flushnormalpath = flushnormalpath
+
+-- The flusher is pdf based, if another backend is used, we need to overload the
+-- flusher; this is beta code, the organization will change (already upgraded in
+-- sync with mplib)
+--
+-- We can avoid the before table but I like symmetry. There is of course a small
+-- performance penalty, but so is passing extra arguments (result, flusher, after)
+-- and returning stuff.
+
+local function ignore() end
+
+function metapost.flush(result,flusher,askedfig)
+ if result then
+ local figures = result.fig
+ if figures then
+ flusher = flusher or pdfflusher
+ local resetplugins = metapost.resetplugins or ignore -- before figure
+ local processplugins = metapost.processplugins or ignore -- each object
+ local synchronizeplugins = metapost.synchronizeplugins or ignore
+ local pluginactions = metapost.pluginactions or ignore -- before / after
+ local startfigure = flusher.startfigure
+ local stopfigure = flusher.stopfigure
+ local flushfigure = flusher.flushfigure
+ local textfigure = flusher.textfigure
+ for f=1, #figures do
+ local figure = figures[f]
+ local objects = getobjects(result,figure,f)
+ local fignum = figure:charcode() or 0
+ if askedfig == "direct" or askedfig == "all" or askedfig == fignum then
+ local t = { }
+ 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]
+ metapost.llx = llx
+ metapost.lly = lly
+ metapost.urx = urx
+ metapost.ury = ury
+ if urx < llx then
+ -- invalid
+ startfigure(fignum,0,0,0,0,"invalid",figure)
+ stopfigure()
+ else
+ startfigure(fignum,llx,lly,urx,ury,"begin",figure)
+ t[#t+1] = "q"
+ if objects then
+ resetplugins(t) -- we should move the colorinitializer here
+ for o=1,#objects do
+ local object = objects[o]
+ local objecttype = object.type
+ if objecttype == "start_bounds" or objecttype == "stop_bounds" or objecttype == "special" then
+ -- skip
+ elseif objecttype == "start_clip" then
+ t[#t+1] = "q"
+ flushnormalpath(object.path,t,false)
+ t[#t+1] = "W n"
+ elseif objecttype == "stop_clip" then
+ t[#t+1] = "Q"
+ miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
+ elseif objecttype == "text" then
+ t[#t+1] = "q"
+ local ot = object.transform -- 3,4,5,6,1,2
+ t[#t+1] = formatters["%f %f %f %f %f %f cm"](ot[3],ot[4],ot[5],ot[6],ot[1],ot[2]) -- TH: formatters["%f %f m %f %f %f %f 0 0 cm"](unpack(ot))
+ flushfigure(t) -- flush accumulated literals
+ t = { }
+ textfigure(object.font,object.dsize,object.text,object.width,object.height,object.depth)
+ t[#t+1] = "Q"
+ else
+ -- we use an indirect table as we want to overload
+ -- entries but this is not possible in userdata
+ --
+ -- can be optimized if no path
+ --
+ local original = object
+ local object = { }
+ setmetatable(object, {
+ __index = original
+ })
+ -- first we analyze
+ local before, after = processplugins(object)
+ local objecttype = object.type -- can have changed
+ if before then
+ t = pluginactions(before,t,flushfigure)
+ end
+ local ml = object.miterlimit
+ if ml and ml ~= miterlimit then
+ miterlimit = ml
+ t[#t+1] = formatters["%f M"](ml)
+ end
+ local lj = object.linejoin
+ if lj and lj ~= linejoin then
+ linejoin = lj
+ t[#t+1] = formatters["%i j"](lj)
+ end
+ local lc = object.linecap
+ if lc and lc ~= linecap then
+ linecap = lc
+ t[#t+1] = formatters["%i J"](lc)
+ end
+ local dl = object.dash
+ if dl then
+ local d = formatters["[%s] %f d"](concat(dl.dashes or {}," "),dl.offset)
+ if d ~= dashed then
+ dashed = d
+ t[#t+1] = dashed
+ end
+ elseif dashed then
+ t[#t+1] = "[] 0 d"
+ dashed = false
+ end
+ local path = object.path -- newpath
+ local transformed, penwidth = false, 1
+ local open = path and path[1].left_type and path[#path].right_type -- at this moment only "end_point"
+ local pen = object.pen
+ if pen then
+ if pen.type == 'elliptical' then
+ transformed, penwidth = pen_characteristics(original) -- boolean, value
+ t[#t+1] = formatters["%f w"](penwidth) -- todo: only if changed
+ if objecttype == 'fill' then
+ objecttype = 'both'
+ end
+ else -- calculated by mplib itself
+ objecttype = 'fill'
+ end
+ end
+ if transformed then
+ t[#t+1] = "q"
+ end
+ if path then
+ if transformed then
+ flushconcatpath(path,t,open)
+ else
+ flushnormalpath(path,t,open)
+ end
+ if objecttype == "fill" then
+ t[#t+1] = "h f"
+ elseif objecttype == "outline" then
+ t[#t+1] = (open and "S") or "h S"
+ elseif objecttype == "both" then
+ t[#t+1] = "h B"
+ end
+ end
+ if transformed then
+ t[#t+1] = "Q"
+ end
+ local path = object.htap
+ if path then
+ if transformed then
+ t[#t+1] = "q"
+ end
+ if transformed then
+ flushconcatpath(path,t,open)
+ else
+ flushnormalpath(path,t,open)
+ end
+ if objecttype == "fill" then
+ t[#t+1] = "h f"
+ elseif objecttype == "outline" then
+ t[#t+1] = (open and "S") or "h S"
+ elseif objecttype == "both" then
+ t[#t+1] = "h B"
+ end
+ if transformed then
+ t[#t+1] = "Q"
+ end
+ end
+ if after then
+ t = pluginactions(after,t,flushfigure)
+ end
+ if object.grouped then
+ -- can be qQ'd so changes can end up in groups
+ miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
+ end
+ end
+ end
+ end
+ t[#t+1] = "Q"
+ flushfigure(t)
+ stopfigure("end")
+ end
+ if askedfig ~= "all" then
+ break
+ end
+ end
+ end
+ end
+ end
+end
+
+function metapost.parse(result,askedfig)
+ if result then
+ local figures = result.fig
+ if figures then
+ local analyzeplugins = metapost.analyzeplugins -- each object
+ for f=1,#figures do
+ local figure = figures[f]
+ local fignum = figure:charcode() or 0
+ if askedfig == "direct" or askedfig == "all" or askedfig == fignum then
+ local bbox = figure:boundingbox()
+ metapost.llx = bbox[1]
+ metapost.lly = bbox[2]
+ metapost.urx = bbox[3]
+ metapost.ury = bbox[4]
+ local objects = getobjects(result,figure,f)
+ if objects then
+ for o=1,#objects do
+ analyzeplugins(objects[o])
+ end
+ end
+ if askedfig ~= "all" then
+ break
+ end
+ end
+ end
+ end
+ end
+end
+
+-- tracing:
+
+local t = { }
+
+local flusher = {
+ startfigure = function()
+ t = { }
+ context.startnointerference()
+ end,
+ flushfigure = function(literals)
+ local n = #t
+ for i=1, #literals do
+ n = n + 1
+ t[n] = literals[i]
+ end
+ end,
+ stopfigure = function()
+ context.stopnointerference()
+ end
+}
+
+function metapost.pdfliterals(result)
+ metapost.flush(result,flusher)
+ return t
+end
+
+-- so far
+
+function metapost.totable(result)
+ local figure = result and result.fig and result.fig[1]
+ if figure then
+ local t = { }
+ local objects = figure:objects()
+ for o=1,#objects do
+ local object = objects[o]
+ local tt = { }
+ local fields = mplib.fields(object)
+ for f=1,#fields do
+ local field = fields[f]
+ tt[field] = object[field]
+ end
+ t[o] = tt
+ end
+ local b = figure:boundingbox()
+ return {
+ boundingbox = { llx = b[1], lly = b[2], urx = b[3], ury = b[4] },
+ objects = t
+ }
+ else
+ return nil
+ end
+end
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