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|
-- Code39 barcode encoder implementation
-- Copyright (C) 2020 Roberto Giacomelli
--
-- All dimensions must be in scaled point (sp)
-- every fields that starts with an undercore sign are intended as private
local Code39 = {
_VERSION = "code39 v0.0.5",
_NAME = "Code39",
_DESCRIPTION = "Code39 barcode encoder",
}
Code39._symb_def = {-- symbol definition
["0"] = 112122111, ["1"] = 211112112, ["2"] = 211112211,
["3"] = 111112212, ["4"] = 211122111, ["5"] = 111122112,
["6"] = 111122211, ["7"] = 212112111, ["8"] = 112112112,
["9"] = 112112211, ["A"] = 211211112, ["B"] = 211211211,
["C"] = 111211212, ["D"] = 211221111, ["E"] = 111221112,
["F"] = 111221211, ["G"] = 212211111, ["H"] = 112211112,
["I"] = 112211211, ["J"] = 112221111, ["K"] = 221111112,
["L"] = 221111211, ["M"] = 121111212, ["N"] = 221121111,
["O"] = 121121112, ["P"] = 121121211, ["Q"] = 222111111,
["R"] = 122111112, ["S"] = 122111211, ["T"] = 122121111,
["U"] = 211111122, ["V"] = 211111221, ["W"] = 111111222,
["X"] = 211121121, ["Y"] = 111121122, ["Z"] = 111121221,
["-"] = 212111121, ["."] = 112111122, [" "] = 112111221,
["$"] = 111212121, ["/"] = 121112121, ["+"] = 121211121,
["%"] = 121212111,
}
Code39._star_def = 112121121 -- '*' start/stop character
-- parameters definition
Code39._par_order = {
"module",
"ratio",
"quietzone",
"interspace",
"height",
"text_enabled",
"text_vpos",
"text_hpos",
"text_gap",
"text_star",
}
Code39._par_def = {}
local pardef = Code39._par_def
-- module main parameter
pardef.module = {
-- Narrow element X-dimension is the width of the smallest element in a
-- barcode symbol.
-- The X-dimension impacts scan-ability. Within the allowed range, it is
-- recommended to use the largest possible X-dimension that is consistent
-- with label or form design.
-- The module width (width of narrow element) should be at least 7.5 mils
-- or 0.1905mm (a mil is 1/1000 inch).
default = 7.5 * 0.0254 * 186467, -- 7.5 mils (sp) unit misure,
unit = "sp", -- scaled point
isReserved = true,
fncheck = function (self, mod, _) --> boolean, err
if mod >= self.default then return true, nil end
return false, "[OutOfRange] too small value for module"
end,
}
pardef.ratio = {
-- The "wide" element is a multiple of the "narrow" element and this
-- multiple must remain the same throughout the symbol. This multiple can
-- range between 2.0 and 3.0. Preferred value is 3.0.
-- The multiple for the wide element should be between 2.0 and 3.0 if the
-- narrow element is greater than 20 mils. If the narrow element is less
-- than 20 mils (0.508mm), the multiple can only range between 2.0 and 2.2.
default = 2.0, -- the minimum
unit = "absolute-number",
isReserved = true,
fncheck = function (self, ratio, tparcheck) --> boolean, err
local mils = 0.0254 * 186467
local mod = tparcheck.module
local maxr; if mod < 20*mils then maxr = 2.2 else maxr = 3.0 end
if ratio < 2.0 then
return false, "[OutOfRange] too small ratio (min 2.0)"
end
if ratio > maxr then
return false, "[OutOfRange] too big ratio (max "..maxr..")"
end
return true, nil
end,
}
pardef.quietzone = {
-- It is recommended to use the largest possible quiet zone, that is
-- consistent with label or form design.
-- Quiet zones must be at least 10 times the module width or 0.10 inches,
-- whichever is larger. Default value (100 mils)
default = 2.54 * 186467, -- 0.1 inches equal to 100*mils
unit = "sp", -- scaled point
isReserved = false,
fncheck = function (self, qz, tparcheck) --> boolean, err
local mils = 0.0254 * 186467
local mod = tparcheck.module
local min = math.max(10*mod, 100*mils)
if qz >= min then
return true, nil
end
return false, "[OutOfRange] quietzone too small"
end,
fndefault = function(self, tck) --> default value respect to a set of param
local mod = tck.module
return math.max(10*mod, self.default)
end,
}
pardef.interspace = { -- Intercharacter gap
-- The intercharacter gap width (igw) is 5.3 times the module width (mw) if
-- mw is less than 10 mils. If mw is 10 mils or greater, the value for igw
-- is 3mw or 53 mils, whichever is greater. However, for quality printers,
-- igw often equals mw.
default = 7.5 * 0.0254 * 186467, -- 1 module, for quality printer
unit = "sp", -- scaled point
isReserved = false,
fncheck = function (self, igw, tparcheck) --> boolean, err
local mod = tparcheck.module
if igw >= mod then return true, nil end
return false, "[OutOfRange] interspace too small"
end,
fndefault = function(self, tck) --> default value respect to a set of param
return tck.module
end,
}
pardef.height = {
-- To enhance readability, it is recommended that the barcode be designed
-- to be as tall as possible, taking into consideration the aspects of label
-- and forms design.
-- The height should be at least 0.15 times the barcode's length or 0.25 inch.
default = 8 * 186467, -- 8 mm -- TODO: better assessment for symbol length
unit = "sp", -- scaled point
isReserved = false,
fncheck = function (self, h, _) --> boolean, err
local mils = 0.0254 * 186467
if h >= 250*mils then return true, nil end
return false, "[OutOfRange] height too small"
end,
}
-- text yes or not
pardef.text_enabled = { -- boolean type
-- enable/disable a text label upon the barcode symbol
default = true,
isReserved = false,
fncheck = function (self, flag, _) --> boolean, err
if type(flag) == "boolean" then
return true, nil
else
return false, "[TypeErr] not a boolean value"
end
end,
}
-- define the text label vertical position
pardef.text_vpos = { -- enumeration
default = "bottom",
isReserved = false,
policy_enum = {
top = true, -- place text at the top of symbol
bottom = true, -- place text under the symbol
},
fncheck = function (self, e, _) --> boolean, err
if type(e) ~= "string" then return false, "[TypeError] not a string" end
local keys = self.policy_enum
if keys[e] == true then
return true, nil
else
return false, "[Err] enumeration value '"..e.."' not found"
end
end,
}
-- define the text label horizontal position
pardef.text_hpos = { -- enumeration
default = "left",
isReserved = false,
policy_enum = {
left = true,
center = true,
right = true,
spaced = true,
},
fncheck = function (self, e, _) --> boolean, err
if type(e) ~= "string" then return false, "[TypeError] not a string" end
local keys = self.policy_enum
if keys[e] == true then
return true, nil
else
return false, "[Err] enumeration value '"..e.."' not found"
end
end,
}
-- vertical dimension between symbol and text
pardef.text_gap = {
default = 2.2 * 65536, -- 2.2 pt
isReserved = false,
unit = "em", --> TODO: please put this under further analisys asap
fncheck = function(self, g, _) --> boolean, err
if type(g) == "number" then
if g > 0 then
return true, nil
else
return false, "[OptErr] negative number"
end
else
return false, "[TypeErr] not valid type for gap opt"
end
end,
}
-- star character appearing
pardef.text_star = {
default = false,
isReserved = false,
fncheck = function(_self, flag, _) --> boolean, err
if type(flag) == "boolean" then
return true, nil
else
return false, "[TypeErr] not a boolean value"
end
end,
}
-- configuration function
function Code39:_config() --> ok, err
-- build Vbar object for the start/stop symbol
local mod, ratio = self.module, self.ratio
local n_star = self._star_def
local Vbar = self._libgeo.Vbar -- Vbar class
self._vbar = {['*'] = Vbar:from_int_revpair(n_star, mod, mod*ratio)}
return true, nil
end
-- overriding Barcode method
function Code39:_check_char(c) --> elem, err
if type(c) ~= "string" or #c ~= 1 then
return nil, "[ArgErr] invalid char"
end
local symb_def = self._symb_def
local n = symb_def[c]
if not n then
local fmt = "[ArgErr] '%s' is not a valid Code 39 symbol"
return nil, string.format(fmt, c)
end
return c, nil
end
-- overriding Barcode method
function Code39:_check_digit(n) --> elem, err
if type(n) ~= "number" then
return nil, "[ArgErr] not a number"
end
if n < 0 or n > 9 then
return nil, "[ArgErr] not a digit"
end
return string.char(n + 48), nil
end
function Code39:_finalize() --> ok, err
local v = assert(self._code_data, "[InternalErr] '_code_data' field is nil")
local vbar = self._vbar
local g_Vbar = self._libgeo.Vbar
local mod, ratio = self.module, self.ratio
local symb_def = self._symb_def
for _, c in ipairs(v) do
if not vbar[c] then
local n1 = symb_def[c]
vbar[c] = g_Vbar:from_int_revpair(n1, mod, mod*ratio)
end
end
return true, nil
end
-- tx, ty is an optional translator vector
function Code39:append_ga(canvas, tx, ty) --> canvas
local code = self._code_data
local ns = self._code_len -- number of chars inside the symbol
local mod = self.module
local ratio = self.ratio
local interspace = self.interspace
local h = self.height
local xs = mod*(6 + 3*ratio)
local xgap = xs + interspace
local w = xgap*(ns + 1) + xs -- (ns + 2)*xgap - interspace
local ax, ay = self.ax, self.ay
local x0 = (tx or 0) - ax * w
local y0 = (ty or 0) - ay * h
local x1 = x0 + w
local y1 = y0 + h
local xpos = x0
local err
err = canvas:start_bbox_group()
assert(not err, err)
local vbar = self._vbar
-- start/stop symbol
local term_vbar = vbar['*']
-- draw start symbol
err = canvas:encode_Vbar(term_vbar, xpos, y0, y1)
assert(not err, err)
for _, c in ipairs(code) do -- draw code symbols
xpos = xpos + xgap
local vb = vbar[c]
err = canvas:encode_Vbar(vb, xpos, y0, y1)
assert(not err, err)
end
-- draw stop symbol
err = canvas:encode_Vbar(term_vbar, xpos + xgap, y0, y1)
assert(not err, err)
-- bounding box setting
local qz = self.quietzone
err = canvas:stop_bbox_group(x0 - qz, y0, x1 + qz, y1)
assert(not err, err)
-- check height as the minimum of 15% of length
-- TODO: message could warn the user
-- if 0.15 * w > h then
-- message("The height of the barcode is to small")
-- end
if self.text_enabled then -- human readable text
local chars; if self.text_star then
chars = {"*"}
for _, c in ipairs(code) do
chars[#chars + 1] = c
end
chars[#chars + 1] = "*"
else
chars = {}
for _, c in ipairs(code) do
chars[#chars + 1] = c
end
end
local Text = self._libgeo.Text
local txt = Text:from_chars(chars)
-- setup text position
local txt_vpos = self.text_vpos
local txt_gap = self.text_gap
local ypos, tay; if txt_vpos == "top" then -- vertical setup
ypos = y1 + txt_gap
tay = 0.0
elseif txt_vpos == "bottom" then
ypos = y0 - txt_gap
tay = 1.0
else
error("[IntenalErr] text vertical placement option is wrong")
end
local txt_hpos = self.text_hpos
if txt_hpos == "spaced" then -- horizontal setup
local xaxis = x0
if not self.text_star then
xaxis = xaxis + xgap
end
xaxis = xaxis + xs/2
err = canvas:encode_Text_xspaced(txt, xaxis, xgap, ypos, tay)
assert(not err, err)
else
local xpos, tax
if txt_hpos == "left" then
xpos = x0
tax = 0.0
elseif txt_hpos == "center" then
xpos = (x1 + x0)/2
tax = 0.5
elseif txt_hpos == "right" then
xpos = x1
tax = 1.0
else
error("[InternalErr] wrong option for text_pos")
end
err = canvas:encode_Text(txt, xpos, ypos, tax, tay)
assert(not err, err)
end
end
return canvas
end
return Code39
--
|