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|
--
-- This is file `luamplib.lua',
-- generated with the docstrip utility.
--
-- The original source files were:
--
-- luamplib.dtx (with options: `lua')
--
-- See source file 'luamplib.dtx' for licencing and contact information.
--
module('luamplib', package.seeall)
local err, warn, info, log = luatexbase.provides_module({
name = "luamplib",
version = 1.09,
date = "2011/11/09",
description = "Lua package to typeset Metapost with LuaTeX's MPLib.",
})
local function term(...)
texio.write_nl('term', 'luamplib: ' .. string.format(...))
end
local format, concat, abs = string.format, table.concat, math.abs
local data = ""
local function resetdata()
data = ""
end
function addline(line)
data = data .. '\n' .. line
end
function processlines()
process(data)
resetdata()
end
local mpkpse = kpse.new("luatex", "mpost")
local function finder(name, mode, ftype)
if mode == "w" then
return name
else
return mpkpse:find_file(name,ftype)
end
end
local currentformat = "plain"
function setformat (name)
currentformat = name
end
function load()
local mpx = mplib.new {
find_file = finder,
ini_version = true,
}
mpx:execute(format("input %s ;", currentformat))
return mpx
end
function report(result)
if not result then
err("no result object")
elseif result.status > 0 then
local t, e, l, f = result.term, result.error, result.log
if l then
log(l)
end
if t then
term(t)
end
if e then
if result.status == 1 then
warn(e)
else
err(e)
end
end
if not t and not e and not l then
if result.status == 1 then
warn("unknown error, no error, terminal or log messages, maybe missing beginfig/endfig")
else
err("unknown error, no error, terminal or log messages, maybe missing beginfig/endfig")
end
end
else
return true
end
return false
end
function process(data)
local converted, result = false, {}
local mpx = load()
if mpx and data then
local result = mpx:execute(data)
if report(result) then
if result.fig then
converted = convert(result)
else
warn("no figure output")
end
end
else
err("Mem file unloadable. Maybe generated with a different version of mplib?")
end
return converted, result
end
local function getobjects(result,figure,f)
return figure:objects()
end
function convert(result, flusher)
flush(result, flusher)
return true -- done
end
local function pdf_startfigure(n,llx,lly,urx,ury)
tex.sprint(format("\\mplibstarttoPDF{%s}{%s}{%s}{%s}",llx,lly,urx,ury))
end
local function pdf_stopfigure()
tex.sprint("\\mplibstoptoPDF")
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
function flush(result,flusher)
if result then
local figures = result.fig
if figures then
for f=1, #figures do
log("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(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 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 of File `luamplib.lua'.
|
