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if not modules then modules = { } end modules ['mlib-pdf'] = {
version = 1.001,
comment = "companion to mlib-ctx.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
local format, join = string.format, table.concat
local sprint = tex.sprint
local abs, sqrt, round = math.abs, math.sqrt, math.round
metapost = metapost or { }
metapost.multipass = false
metapost.n = 0
function metapost.convert(result, trialrun, flusher, multipass)
if trialrun then
metapost.multipass = false
metapost.parse(result, flusher)
if multipass and not metapost.multipass then
metapost.flush(result, flusher) -- saves a run
else
return false
end
else
metapost.flush(result, flusher)
end
return true -- done
end
function metapost.comment(message)
if message then
sprint(tex.ctxcatcodes,format("\\MPLIBtoPDF{\\letterpercent\\space mps graphic %s: %s}", metapost.n, message))
end
end
metapost.flushers = { }
metapost.flushers.pdf = { }
function metapost.flushers.pdf.startfigure(n,llx,lly,urx,ury,message)
metapost.n = metapost.n + 1
sprint(tex.ctxcatcodes,format("\\startMPLIBtoPDF{%s}{%s}{%s}{%s}",llx,lly,urx,ury))
if message then metapost.comment(message) end
end
function metapost.flushers.pdf.stopfigure(message)
if message then metapost.comment(message) end
sprint(tex.ctxcatcodes,"\\stopMPLIBtoPDF")
end
function metapost.flushers.pdf.flushfigure(pdfliterals) -- table
if #pdfliterals > 0 then
sprint(tex.ctxcatcodes,"\\MPLIBtoPDF{",join(pdfliterals,"\n"),"}")
end
end
function metapost.flushers.pdf.textfigure(font,size,text,width,height,depth) -- we could save the factor
text = text:gsub(".","\\hbox{%1}") -- kerning happens in metapost (i have to check if this is true for mplib)
sprint(tex.ctxcatcodes,format("\\MPLIBtextext{%s}{%s}{%s}{%s}{%s}",font,size,text,0,-number.dimenfactors.bp*depth))
end
-- the pen calculations are taken from metapost, first converted by
-- taco from c to lua, and then optimized by hans, so all errors are his
local function pyth(a,b)
return sqrt(a*a + b*b) -- much faster than sqrt(a^2 + b^2)
end
local aspect_bound = 10/65536
local aspect_default = 1/65536
local bend_tolerance = 131/65536
local eps = 0.0001
local function coord_range_x(h, dz) -- direction x
local zlo, zhi = 0, 0
for i=1, #h do
local p = h[i]
local z = p.x_coord
if z < zlo then zlo = z elseif z > zhi then zhi = z end
z = p.right_x
if z < zlo then zlo = z elseif z > zhi then zhi = z end
z = p.left_x
if z < zlo then zlo = z elseif z > zhi then zhi = z end
end
return (zhi - zlo <= dz and aspect_bound) or aspect_default
end
local function coord_range_y(h, dz) -- direction y
local zlo, zhi = 0, 0
for i=1, #h do
local p = h[i]
local z = p.y_coord
if z < zlo then zlo = z elseif z > zhi then zhi = z end
z = p.right_y
if z < zlo then zlo = z elseif z > zhi then zhi = z end
z = p.left_y
if z < zlo then zlo = z elseif z > zhi then zhi = z end
end
return (zhi - zlo <= dz and aspect_bound) or aspect_default
end
local rx, sx, sy, ry, tx, ty, divider = 1, 0, 0, 1, 0, 0, 1
local function pen_characteristics(object)
local p = object.pen[1]
local x_coord, y_coord, left_x, left_y, right_x, right_y = p.x_coord, p.y_coord, p.left_x, p.left_y, p.right_x, p.right_y
local wx, wy, width
if right_x == x_coord and left_y == y_coord then
wx = abs(left_x - x_coord)
wy = abs(right_y - y_coord)
else
wx = pyth(left_x - x_coord, right_x - x_coord)
wy = pyth(left_y - y_coord, right_y - y_coord)
end
if wy/coord_range_x(object.path, wx) >= wx/coord_range_y(object.path, wy) then
width = wy
else
width = wx
end
sx, rx, ry, sy, tx, ty = left_x, left_y, right_x, right_y, x_coord, y_coord
sx, rx, ry, sy = (sx-tx), (rx-ty), (ry-tx), (sy-ty) -- combine with previous
if width ~= 1 then
if width == 0 then
sx, sy = 1, 1
else
rx, ry, sx, sy = rx/width, ry/width, sx/width, sy/width
end
end
-- sx rx ry sy tx ty -> 1 0 0 1 0 0 is ok, but 0 0 0 0 0 0 not
if true then
if abs(sx) < eps then sx = eps end
if abs(sy) < eps then sy = eps end
else
-- this block looks complicated but it only captures invalid transforms
-- to be checked rx vs sx and so
local det = sx/sy - ry/rx
local aspect = 4*aspect_bound + aspect_default
if abs(det) < aspect then
local s
if det >= 0 then
s, aspect = 1, aspect - det
else
s, aspect = -1, -aspect - det -- - ?
end
local absrx, absry, abssy, abssx = abs(rx), abs(ry), abs(sy), abs(sx)
if abssx + abssy >= absry + absrx then -- was yy
if abssx > abssy then
sy = sy + (aspect + s*abssx) / sx
else
sx = sx + (aspect + s*abssy) / sy
end
else
if absry > absrx then
rx = rx + (aspect + s*absry) / ry
else
ry = ry + (aspect + s*absrx) / rx
end
end
end
end
divider = sx*sy - rx*ry
return not (sx==1 and rx==0 and ry==0 and sy==1 and tx==0 and ty==0), width
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, t, open)
local pth, ith
for i=1,#path do
pth = path[i]
if not ith then
t[#t+1] = format("%f %f m",pth.x_coord,pth.y_coord)
elseif curved(ith,pth) then
t[#t+1] = format("%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[#t+1] = format("%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
t[#t+1] = format("%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[#t+1] = format("%f %f l",one.x_coord,one.y_coord)
end
end
return t
end
local function flushconcatpath(path, t, open)
t[#t+1] = format("%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
t[#t+1] = format("%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)
t[#t+1] = format("%f %f %f %f %f %f c",a,b,c,d,concat(pth.x_coord, pth.y_coord))
else
t[#t+1] = format("%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)
t[#t+1] = format("%f %f %f %f %f %f c",a,b,c,d,concat(one.x_coord, one.y_coord))
else
t[#t+1] = format("%f %f l",concat(one.x_coord,one.y_coord))
end
end
return t
end
metapost.specials = metapost.specials or { }
-- we have two extension handlers, one for pre and postscripts, and one for colors
-- the flusher is pdf based, if another backend is used, we need to overload the
-- flusher; this is beta code, the organization will change
function metapost.flush(result,flusher) -- pdf flusher, table en dan concat is sneller, 1 literal
if result then
local figures = result.fig
if figures then
flusher = flusher or metapost.flushers.pdf
local colorconverter = metapost.colorconverter() -- function !
local colorhandler = metapost.colorhandler
for f=1, #figures do
local figure = figures[f]
--~ local objects = figure:objects()
local objects = result.objects
if not objects then
objects = figure:objects()
result.objects = objects
end
local fignum = tonumber((figure:filename()):match("([%d]+)$") or 0)
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] -- faster than unpack
if urx < llx then
-- invalid
flusher.startfigure(fignum,0,0,0,0,"invalid")
flusher.stopfigure()
else
flusher.startfigure(fignum,llx,lly,urx,ury,"begin")
t[#t+1] = "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
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 == "special" then
metapost.specials.register(object.prescript)
elseif objecttype == "text" then
t[#t+1] = "q"
local ot = object.transform -- 3,4,5,6,1,2
t[#t+1] = format("%f %f %f %f %f %f cm",ot[3],ot[4],ot[5],ot[6],ot[1],ot[2]) -- TH: format("%f %f m %f %f %f %f 0 0 cm",unpack(ot))
flusher.flushfigure(t)
t = { }
flusher.textfigure(object.font,object.dsize,object.text,object.width,object.height,object.depth)
t[#t+1] = "Q"
else
-- alternatively we can pass on the stack, could be a helper
local currentobject = { -- not needed when no extensions
type = object.type,
miterlimit = object.miterlimit,
linejoin = object.linejoin,
linecap = object.linecap,
color = object.color,
dash = object.dash,
path = object.path,
htap = object.htap,
pen = object.pen,
prescript = object.prescript,
postscript = object.postscript,
}
--
local before, inbetween, after = nil, nil, nil
--
local cs, cr = currentobject.color, nil
-- todo document why ...
if cs and colorhandler and #cs > 0 and round(cs[1]*10000) == 123 then -- test in function
currentobject, cr = colorhandler(cs,currentobject,t,colorconverter)
objecttype = currentobject.type
end
--
local prescript = currentobject.prescript
if prescript then
-- move test to function
local special = metapost.specials[prescript]
if special then
currentobject, before, inbetween, after = special(currentobject.postscript,currentobject,t,flusher)
objecttype = currentobject.type
end
end
--
cs = currentobject.color
if cs and #cs > 0 then
t[#t+1], cr = colorconverter(cs)
end
--
if before then object, t = before() end
local ml = currentobject.miterlimit
if ml and ml ~= miterlimit then
miterlimit = ml
t[#t+1] = format("%f M",ml)
end
local lj = currentobject.linejoin
if lj and lj ~= linejoin then
linejoin = lj
t[#t+1] = format("%i j",lj)
end
local lc = currentobject.linecap
if lc and lc ~= linecap then
linecap = lc
t[#t+1] = format("%i J",lc)
end
local dl = currentobject.dash
if dl then
local d = format("[%s] %i d",join(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
if inbetween then object, t = inbetween() end
local path = currentobject.path
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 = currentobject.pen
if pen then
if pen.type=='elliptical' then
transformed, penwidth = pen_characteristics(object) -- boolean, value
t[#t+1] = format("%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 = currentobject.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 cr then
t[#t+1] = cr
end
if after then object, t = after() end
end
end
end
t[#t+1] = "Q"
flusher.flushfigure(t)
flusher.stopfigure("end")
end
end
end
end
end
function metapost.parse(result)
if result then
local figures = result.fig
if figures then
for f=1, #figures do
local figure = figures[f]
--~ local objects = figure:objects()
local objects = result.objects
if not objects then
objects = figure:objects()
result.objects = objects
end
if objects then
for o=1,#objects do
local object = objects[o]
if object.type == "outline" then
local prescript = object.prescript
if prescript then
local special = metapost.specials[prescript]
if special then
special(object.postscript,object)
end
end
end
end
end
end
end
end
end
do
-- just tracing
local t = { }
local flusher = {
startfigure = function()
t = { }
sprint(tex.ctxcatcodes,"\\startnointerference")
end,
flushfigure = function(literals)
for i=1, #literals do
t[#t+1] = literals[i]
end
end,
stopfigure = function()
sprint(tex.ctxcatcodes,"\\stopnointerference")
end
}
function metapost.pdfliterals(result)
metapost.flush(result,flusher)
return t
end
end
function metapost.totable(result)
local figure = result and result.fig and result.fig[1]
if figure then
local t = { }
local objects = figure:objects()
for _, object in ipairs(objects) do
local tt = { }
for _, field in ipairs(mplib.fields(object)) do
tt[field] = object[field]
end
t[#t+1] = 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
function metapost.colorconverter()
return function(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
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