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--
-- ga graphic assembler or
-- Intermediate Graphic Language for barcode drawing
-- Copyright (C) 2019 Roberto Giacomelli
--
-- All dimensions are in scaled point (sp)
-- ga LuaTeX Driver (native implementation node+pdfliteral)
-- class for drawing elementary geometric elements
local PDFnative = {
_VERSION = "PDFnative v0.0.4",
_NAME = "PDFnative",
_DESCRIPTION = "A LuaTeX native pdfliteral driver for ga graphic stream",
}
PDFnative.ext = "txt" -- file extension
PDFnative.buf_sep = "\n" -- separation string for buffer concat
function PDFnative.init_buffer(st) --> buffer, text buffer
st.head = nil -- addition for text processing (to remember purpose)
st.last = nil
st.hbox = nil
st.cw = nil
st.x_hbox = nil
st.char_counter = nil
local bf = {"q"} -- create a new graphic stack
local xt = {} -- text buffer
return bf, xt
end
function PDFnative.close_buffer(st, bf, xt)
bf[#bf + 1] = "Q" -- stack restoring
end
-- text utility special functions
local function newglue(w) --> node
local n = node.new("glue")
n.width = w
return n
end
local function newglyph(c) --> node -- ? U+2423 ␣ for whitespace?
if c == 32 then
return newglue(tex.sp "3.5pt")
end
local n = node.new("glyph")
n.char = c
n.font = font.current()
return n
end
local function newpdfliteral(buf) --> node
local npdf = node.new("whatsit", "pdf_literal")
npdf.mode = 0
npdf.data = table.concat(buf, "\n")
return npdf
end
local function append_glyph(head, last, c) --> head, last, xdim
if c == 32 then -- space
local space = tex.sp "3.5pt"
head, last = node.insert_after(head, last, newglue(space))
return head, last, space
else
local g = newglyph(c)
local xdim = g.width
head, last = node.insert_after(head, last, g)
return head, last, xdim
end
end
-- special drawing function
function PDFnative.hboxcreate(hboxname, st, buf, txt) --> ok, err
local node = assert(node, "This is not LuaTeX!")
local tex = assert(tex)
local font = assert(font)
if not tex.isbox(hboxname) then
return nil, string.format("Box register [%s] doesn’t exist", hboxname)
end
local bb_x1, bb_y1, bb_x2, bb_y2 = st.bb_x1, st.bb_y1, st.bb_x2, st.bb_y2
local npdf = newpdfliteral(buf) -- node whatsit pdfliteral
-- vboxing, vertical correction
local vpdf = node.vpack(npdf)
vpdf.height = -bb_y1
-- glue, for horizontal correction
local ng = newglue(-bb_x1)
local head, last = node.insert_after(ng, ng, vpdf)
local xprev = 0.0
for _, t in ipairs(txt) do -- text processing
local gy = newglue(t[3] - bb_y1) -- n, x, y, w, h -- t[3] -t[5] - bb_y1
local nvtxt = node.insert_after(t[1], t[1], gy)
local vtxt = node.vpack(nvtxt)
local gx = newglue(t[2]-xprev)
head, last = node.insert_after(head, last, gx)
head, last = node.insert_after(head, last, vtxt)
xprev = t[2] + t[4]
end
-- hboxing
local hbox = node.hpack(head)
hbox.width = bb_x2 - bb_x1
hbox.height = bb_y2 - bb_y1
tex.box[hboxname] = hbox
return true, nil
end
-- PDF literal encoding functions
-- 1 <W: dim>; set line width
function PDFnative.append_001(st, bf, xt, w)
local bp = st.bp -- 1bp (sp)
bf[#bf + 1] = string.format("%0.6f w", w/bp)
end
-- 2 <enum: u8>; set line cap style
function PDFnative.append_002(st, bf, xt, cap)
bf[#bf + 1] = string.format("%d J", cap)
end
-- 3 <enum: u8>; set line join style
function PDFnative.append_003(st, bf, xt, j)
bf[#bf + 1] = string.format("%d j", j)
end
-- draw an horizontal line
-- 33 <x1: DIM> <x2: DIM> <y: DIM>
function PDFnative.append_033(st, bf, xt, x1, x2, y)
local bp = st.bp -- conversion factor bp -> sp
bf[#bf + 1] = string.format("% 0.6f %0.6f m", x1/bp, y/bp)
bf[#bf + 1] = string.format("% 0.6f %0.6f l", x2/bp, y/bp)
bf[#bf + 1] = "S" -- stroke
end
-- vline
-- draw a vertical line
-- 34 <y1: DIM> <y2: DIM> <x: DIM>
function PDFnative.append_034(st, bf, xt, y1, y2, x)
local bp = st.bp -- conversion factor bp -> sp
bf[#bf + 1] = string.format("% 0.6f %0.6f m", x/bp, y1/bp)
bf[#bf + 1] = string.format("% 0.6f %0.6f l", x/bp, y2/bp)
bf[#bf + 1] = "S" -- stroke
end
-- Vbar
-- draw a group of vertical lines
-- 36 <y1: DIM> <y2: DIM> <b: UINT> <x1: DIM> <t1: DIM> ...
function PDFnative.append_036_bar(st, bf, xt, x, w, y1, y2)
local bp = st.bp -- conversion factor bp -> sp
local fmt = "%0.6f %0.6f %0.6f %0.6f re"
local x1 = x - w/2
local h = y2 - y1
-- pdf literal insertion <x y w h re>
bf[#bf + 1] = string.format(fmt, x1/bp, y1/bp, w/bp, h/bp)
end
function PDFnative.append_036_stop(st, bf, xt, nbar, y1, y2)
bf[#bf + 1] = "f" -- fill
bf[#bf + 1] = "S" -- stroke
end
-- draw a rectangle
-- 48 <x1: DIM> <y1: DIM> <x2: DIM> <y2: DIM>
function PDFnative.append_048(st, bf, xt, x1, y1, x2, y2)
local w = x2 - x1 -- rectangle width
assert(w > 0)
local h = y2 - y1 -- rectangle height
assert(h > 0)
local bp = st.bp -- conversion factor
local fmt = "%0.6f %0.6f %0.6f %0.6f re S"
-- pdf literal string <x y w h re>
bf[#bf + 1] = string.format(fmt, x1/bp, y1/bp, w/bp, h/bp)
end
-- 130 <text> Text with several glyphs
-- 130 <ax: FLOAT> <ay: FLOAT> <xpos: DIM> <ypos: DIM> <c: CHARS>
function PDFnative.append_130_char(st, bf, xt, c)
local head, last = st.head, st.last
head, last = append_glyph(head, last, c)
st.head = head
st.last = last
end
-- return bounding box of the text object without deep
function PDFnative.append_130_stop(st, bf, xt, xpos, ypos, ax, ay)
local head = assert(st.head)
st.head = nil -- reset temporary reference
st.last = nil
local hbox = node.hpack(head)
local w, h, d = node.dimensions(hbox)
local x1 = xpos - ax*w -- text position
local y1; if ay > 0 then
y1 = ypos - h*ay
else
y1 = ypos - d*ay
end
xt[#xt + 1] = {hbox, x1, y1 - d, w, h}
return x1, y1, x1 + w, y1 + h
end
-- 131 <text_xspaced>, Text with glyphs equally spaced on its vertical axis
-- 131 <x1: DIM> <xgap: DIM> <ay: FLOAT> <ypos: DIM> <c: CHARS>
function PDFnative.append_131_char(st, bf, xt, c, xgap)
local head, last, prec_cw = st.head, st.last, st.cw
local cw
if prec_cw then
local g = newglyph(c)
cw = g.width
local isp = xgap - (cw + prec_cw)/2
local s = newglue(isp)
head, last = node.insert_after(head, last, s)
head, last = node.insert_after(head, last, g)
else -- first char
head, last, cw = append_glyph(head, last, c)
st.x_hbox = cw/2
end
st.cw = cw
st.head = head
st.last = last
end
function PDFnative.append_131_stop(st, bf, xt, x1, xgap, ypos, ay) --> bb
local head = assert(st.head)
st.head = nil -- reset temporary reference
st.last = nil
st.cw = nil
local hbox = node.hpack(head)
local w, h, d = node.dimensions(hbox)
local bx1 = x1 - st.x_hbox
st.x_hbox = nil -- reset temporary references
local y1; if ay > 0 then
y1 = ypos - h*ay
else
y1 = ypos - d*ay
end
xt[#xt + 1] = {hbox, bx1, y1 - d, w, h}
return bx1, y1, bx1 + w, y1 + h
end
-- 132 <text_xwidth> Glyphs equally spaced on vertical axis between two x coordinates
-- 132 <ay: FLOAT> <x1: DIM> <x2: DIM> <y: DIM> <c: CHARS>
function PDFnative.append_132_char(st, bf, xt, c)
local head, last = st.head, st.last
if head then
local g = newglyph(c)
local s = newglue(1)
head, last = node.insert_after(head, last, s)
head, last = node.insert_after(head, last, g)
st.char_counter = st.char_counter + 1
else -- first char
head, last, cw = append_glyph(head, last, c)
st.cw = cw
st.char_counter = 1
end
st.head = head
st.last = last
end
function PDFnative.append_132_stop(st, bf, xt, x1, x2, ypos, ay) --> p1, p2
local head, last = st.head, st.last
st.head = nil -- reset temporary registry
st.last = nil
local w_1 = st.cw
st.cw = nil
local i = st.char_counter
st.char_counter = nil
local w_n = last.width
local xgap = (x2 - x1 - (w_1 + w_n)/2)/(i - 1)
local c_curr = head
for _ = 1, i - 1 do
local g = c_curr.next
local c_next = g.next
local w_2
w_1, w_2 = c_curr.width, c_next.width
g.width = xgap - (w_1 + w_2)/2
c_curr = c_next
end
local hbox = node.hpack(head)
local w, h, d = node.dimensions(hbox)
local y; if ay > 0 then
y = ypos - h*ay
else
y = ypos - d*ay
end
xt[#xt + 1] = {hbox, x1, y - d, w, h}
return x1, y, x2, y + h
end
return PDFnative
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