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|
-- class gaCanvas
-- Copyright (C) 2019-2022 Roberto Giacomelli
-- <ga> encoding functions (see barracuda-manual.pdf)
local gaCanvas = {_classname = "gaCanvas"}
gaCanvas.__index = gaCanvas
gaCanvas.mm = 186467.98110236 -- conversion factor sp -> mm (millimeter)
gaCanvas.bp = 65781.76 -- conversion factor sp -> bp (big point)
gaCanvas.pt = 65536 -- sp -> pt
-- ga specification: see the file ga-grammar.pdf in the doc directory
-- gaCanvas constructor
function gaCanvas:new() --> object
local drv = assert(self._driver_class)
-- graphic state fields returned by Driver:default_style() method
-- linewidth
-- linecap
-- linejoin
-- dashpattern
-- dashphase
local o = assert(drv:default_style()) -- initial graphic state
o._version = 100 -- version of the ga format
o._data = {} -- ga stream array
o.bb_on = true
setmetatable(o, self)
return o
end
-- save graphic data in an external file with the 'id_drv' format
-- id_drv::= string, specific driver output identifier
-- filename ::= string, file name
-- ext ::= string, file extension (optional, default SVG)
function gaCanvas:save(id_drv, filename, ext) --> ok, err
local driver = self._driver_class
return driver:save(id_drv, self, filename, ext)
end
-- insert a ga drawing in a TeX hbox
-- PDFnative only function
-- boxname ::= string
function gaCanvas:ga_to_hbox(boxname) --> ok, err
local driver = self._driver_class
return driver:ga_to_hbox(self, boxname)
end
-- return a clone of the <ga> stream array
function gaCanvas:get_stream() --> table (as a flat array)
local data = self._data
local t = {}
for _, v in ipairs(data) do
t[#t + 1] = v
end
return t
end
-- Ipothetical further constructor
-- function gaCanvas:from_tcp_server() --> err
-- end
-- function gaCanvas:get_bbox()
-- end
-- function gaCanvas:check() --> ok, err
-- end
-- line width: opcode <1> <w: DIM>
function gaCanvas:encode_linewidth(w) --> ok, err
if type(w) ~= "number" then
return false, "[ArgErr 'w'] number expected"
end
if w < 0 then return false, "[ArgErr: w] negative number not allowed" end
self.linewidth = w
local data = self._data
data[#data + 1] = 1 -- opcode for line thickness
data[#data + 1] = w
return true, nil
end
-- line cap style: opcode <2> cap <u8>|<enum>
-- 0 | "butt": Butt cap
-- 1 | "round": Round cap
-- 2 | "proj": Projecting square cap
function gaCanvas:encode_linecap(cap) --> ok, err
local tcap = type(cap)
local cap_res
if tcap == "number" then
if cap == 0 or cap == 1 or cap == 2 then
cap_res = cap
else
return false, "[ArgErr: cap] 0, 1 or 2 expected"
end
elseif tcap == "string" then
if cap == "butt" then
cap_res = 0
elseif cap == "round" then
cap_res = 1
elseif cap == "proj" then
cap_res = 2
else
return false, "[ArgErr: cap] 'butt', 'round' or 'proj' expected"
end
else
return false, "[ArgErr: cap] number or string expected"
end
self.linecap = cap_res
local data = self._data
data[#data + 1] = 2 -- opcode for line cap style
data[#data + 1] = cap_res
return true, nil
end
-- line join style: opcode <3> join <u8>|<enum>
-- 0 | "miter" : Miter join
-- 1 | "round" : Round join
-- 2 | "bevel" : Bevel join
function gaCanvas:encode_linejoin(join) --> ok, err
local tjoin = type(join)
local join_res
if tjoin == "number" then
if join == 0 or join == 1 or join == 2 then
join_res = join
else
return false, "[ArgErr: join] 0, 1 or 2 integer expected"
end
elseif tjoin == "string" then
if join == "miter" then
join_res = 0
elseif join == "round" then
join_res = 1
elseif join == "bevel" then
join_res = 2
else
return false, "[ArgErr: join] '"..join.."' join style not found"
end
else
return false, "[ArgErr: join] number or string expected"
end
self.linejoin = join_res
local data = self._data
data[#data + 1] = 3 -- opcode for line join style
data[#data + 1] = join_res
return true, nil
end
-- 5 <dash_pattern>, Dash pattern line style, p <len> n <qty> bi <len>
-- p: phase lenght
-- n: number of array element
-- [bi]: dash array of dash and gap lenghts
function gaCanvas:encode_dash_pattern(p, ...) --> ok, err
if type(p) ~= "number" then return false, "[ArgErr: phase] number expected" end
local t = {...}
for i, v in ipairs(t) do
if type(v) ~= "number" then
return false, "[ArgErr: array] found a not number value at index " .. i
end
end
self.dash_pattern = t
self.dash_phase = p
local n = #t
local d = self._data
d[#d + 1] = 5
d[#d + 1] = p
d[#d + 1] = n
for _, b in ipairs(t) do
d[#d + 1] = b
end
return true, nil
end
-- 6 <reset_pattern>, set the continous line style
function gaCanvas:encode_reset_pattern() --> ok, err
self.dash_pattern = nil
self.dash_phase = nil
local d = self._data
d[#d + 1] = 6
return true, nil
end
-- checking the bounding box from now on
-- opcode: <29>
function gaCanvas:encode_enable_bbox() --> ok, err
self.bb_on = true
local data = self._data
data[#data + 1] = 29
return true, nil
end
-- Stop checking the bounding box
-- opcode: <30>
function gaCanvas:encode_disable_bbox() --> ok, err
self.bb_on = false
local data = self._data
data[#data + 1] = 30
return true, nil
end
-- insert a figure bbox
-- code: <31> x1 y1 x2 y2
function gaCanvas:encode_set_bbox(x1, y1, x2, y2) --> ok, err
if type(x1) ~= "number" then return false, "[ArgErr: x1] number expected" end
if type(y1) ~= "number" then return false, "[ArgErr: y1] number expected" end
if type(x2) ~= "number" then return false, "[ArgErr: x2] number expected" end
if type(y2) ~= "number" then return false, "[ArgErr: y2] number expected" end
if x1 > x2 then x1, x2 = x2, x1 end -- re-order coordinates
if y1 > y2 then y1, y2 = y2, y1 end
local data = self._data
data[#data + 1] = 31 -- bounding box of the object group
data[#data + 1] = x1
data[#data + 1] = y1
data[#data + 1] = x2
data[#data + 1] = y2
return true, nil
end
-- insert a line from point (x1, y1) to the point (x2, y2)
-- tx optional translator x-vector
-- ty optional translator y-vector
-- <32> x1 y1 x2 y2
function gaCanvas:encode_line(x1, y1, x2, y2, tx, ty) --> ok, err
if type(x1) ~= "number" then return false, "[ArgErr: x1] number expected" end
if type(y1) ~= "number" then return false, "[ArgErr: y1] number expected" end
if type(x2) ~= "number" then return false, "[ArgErr: x2] number expected" end
if type(y2) ~= "number" then return false, "[ArgErr: y2] number expected" end
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
x1 = x1 + tx
x2 = x2 + tx
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
y1 = y1 + ty
y2 = y2 + ty
end
local data = self._data
data[#data + 1] = 32 -- append line data
data[#data + 1] = x1
data[#data + 1] = y1
data[#data + 1] = x2
data[#data + 1] = y2
return true, nil
end
-- insert an horizontal line from point (x1, y) to point (x2, y)
-- tx optional translator x-vector
-- ty optional translator y-vector
-- <33> x1 x2 y
function gaCanvas:encode_hline(x1, x2, y, tx, ty) --> ok, err
if type(x1) ~= "number" then return false, "[ArgErr: x1] number expected" end
if type(x2) ~= "number" then return false, "[ArgErr: x2] number expected" end
if type(y) ~= "number" then return false, "[ArgErr: y] number expected" end
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
x1 = x1 + tx
x2 = x2 + tx
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
y = y + ty
end
local data = self._data
data[#data + 1] = 33 -- append hline data
data[#data + 1] = x1
data[#data + 1] = x2
data[#data + 1] = y
return true, nil
end
-- vline, Vertical line, from point (x, y1) to point (x, y2)
-- tx optional translator x-vector
-- ty optional translator y-vector
-- <34> y1 y2 x
function gaCanvas:encode_vline(y1, y2, x, tx, ty) --> ok, err
if type(y1) ~= "number" then return false, "[ArgErr] 'y1' number expected" end
if type(y2) ~= "number" then return false, "[ArgErr] 'y2' number expected" end
if type(x) ~= "number" then return false, "[ArgErr] 'x' number expected" end
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
x = x + tx
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
y1 = y1 + ty
y2 = y2 + ty
end
local data = self._data
data[#data + 1] = 34 -- append vline data
data[#data + 1] = y1
data[#data + 1] = y2
data[#data + 1] = x
return true, nil
end
-- insert an open polyline
-- tx optional translator x-vector
-- ty optional translator y-vector
-- <38> <n> x1 y1 x2, y2, ... , xn, yn
function gaCanvas:encode_polyline(point, tx, ty) --> ok, err
if type(point) ~= "table" then
return false, "[ArgErr: point] table expected"
end
local n, p
if point._classname == "Polyline" then
n, p = point:get_points()
else
local len = #point
if len == 0 then return false, "[Err] 'point' is an empty table" end
if (len % 2) ~= 0 then
return false, "[Err] 'point' is not an even long array"
end
n = len/2
for _, coord in ipairs(point) do
if type(coord) ~= "number" then
return false, "[Err] found a non-number in the 'point' array"
end
end
p = point
end
if n < 2 then return
false, "[Err] a polyline must have at least two points"
end
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
else
tx = 0
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
else
ty = 0
end
local data = self._data
data[#data + 1] = 38
data[#data + 1] = n
for i = 1, 2*n, 2 do
data[#data + 1] = p[i] + tx
data[#data + 1] = p[i + 1] + ty
end
return true, nil
end
-- insert a rectangle from point (x1, x2) to (x2, y2)
-- tx optional translator x-vector
-- ty optional translator y-vector
-- <48> <x1: DIM> <y1: DIM> <x2: DIM> <y2: DIM>
function gaCanvas:encode_rect(x1, y1, x2, y2, tx, ty) --> ok, err
if type(x1) ~= "number" then return false, "[ArgErr] 'x1' number expected" end
if type(y1) ~= "number" then return false, "[ArgErr] 'y1' number expected" end
if type(x2) ~= "number" then return false, "[ArgErr] 'x2' number expected" end
if type(y2) ~= "number" then return false, "[ArgErr] 'y2' number expected" end
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
x1 = x1 + tx
x2 = x2 + tx
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
y1 = y1 + ty
y2 = y2 + ty
end
local d = self._data
d[#d + 1] = 48 -- append rectangle data
d[#d + 1] = x1
d[#d + 1] = y1
d[#d + 1] = x2
d[#d + 1] = y2
return true, nil
end
-- Vbar object: opcode <36>
-- tx optional translator x-vector
-- ty optional translator y-vector
-- x0, y1, y2 ordinates
function gaCanvas:encode_vbar(vbar, x0, y1, y2, tx, ty) --> ok, err
if type(vbar) ~= "table" then
return false, "[ArgErr: vbar] table expected"
end
if x0 == nil then
x0 = 0
elseif type(x0) ~= "number" then
return false, "[ArgErr: x0] number expected"
end
if type(y1) ~= "number" then return false, "[ArgErr: y1] number expected" end
if type(y2) ~= "number" then return false, "[ArgErr: y2] number expected" end
-- ordinates
if y1 == y2 then return false, "[ArgErr: y1, y2] same value" end
if y1 > y2 then y1, y2 = y2, y1 end
local bdim, bars
if vbar._classname == "Vbar" then
bdim, bars = vbar:get_bars()
bdim = 2*bdim
else
bdim = #vbar
if bdim % 2 ~= 0 then -- bdim must be even
return false, "[Err: vbar] found an odd array of elements"
end
bars = vbar
end
if bdim == 0 then return false, "[Err: vbar] the number of bars is zero" end
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
x0 = x0 + tx
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
y1 = y1 + ty
y2 = y2 + ty
end
local data = self._data
data[#data + 1] = 36 -- vbar sequence start
data[#data + 1] = y1
data[#data + 1] = y2
data[#data + 1] = bdim/2 -- the number of bars, pair <x_i, w_i>
for i = 1, bdim, 2 do
local coord = bars[i]
local width = bars[i + 1]
if type(coord) ~= "number" then
return false, "[Err] a coordinates is not a number"
end
if type(width) ~= "number" then
return false, "[Err] a width is not a number"
end
data[#data + 1] = coord + x0
data[#data + 1] = width
end
return true, nil
end
-- print a Vbar queue starting at x position 'xpos', between the horizontal line
-- tx optional translator x-vector
-- ty optional translator y-vector
-- at y0 and y1 y-coordinates
function gaCanvas:encode_vbar_queue(queue, xpos, y0, y1, tx, ty) --> ok, err
-- check arg
if type(queue) ~= "table" then
return false, "[ArgErr: queue] table expected"
end
if type(xpos) ~= "number" then
return false, "[ArgErr: xpos] number expected"
end
if type(y0) ~= "number" then
return false, "[ArgErr: y0] number expected"
end
if type(y1) ~= "number" then
return false, "[ArgErr: y1] number expected"
end
local i = 2
while queue[i] do
local x = queue[i - 1] + xpos
local vbar = queue[i]
local _, err = self:encode_vbar(vbar, x, y0, y1, tx, ty)
if err then return false, err end
i = i + 2
end
return true, nil
end
-- tx optional translator x-vector
-- ty optional translator y-vector
-- [text] <130> ax ay xpos ypos chars
function gaCanvas:encode_Text(txt, xpos, ypos, ax, ay, tx, ty) --> ok, err
if type(txt) ~= "table" then
return false, "[ArgErr: txt] object table expected"
end
if type(xpos) ~= "number" then
return false, "[ArgErr: xpos] number expected"
end
if type(ypos) ~= "number" then
return false, "[ArgErr: ypos] number expected"
end
if ax == nil then
ax = 0
elseif type(ax) ~= "number" then
return false, "[ArgErr: ax] number expected"
end
if ay == nil then
ay = 0
elseif type(ay) ~= "number" then
return false, "[ArgErr: ay] number expected"
end
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
xpos = xpos + tx
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
ypos = ypos + ty
end
local chars = assert(txt.codepoint, "[InternalErr: txt] no 'codepoint' found")
if #chars == 0 then return false, "[InternalErr: txt] no chars found" end
local data = self._data
data[#data + 1] = 130
data[#data + 1] = ax -- relative anchor x-coordinate
data[#data + 1] = ay -- relative anchor y-coordinate
data[#data + 1] = xpos -- text x-coordinate
data[#data + 1] = ypos -- text y-coordinate
for _, c in ipairs(chars) do
data[#data + 1] = c
end
data[#data + 1] = 0 -- end string signal
return true, nil
end
-- glyphs equally spaced along the baseline
-- tx optional translator x-vector
-- ty optional translator y-vector
-- [text_xspaced] <131> x1 xgap ay ypos chars
function gaCanvas:encode_Text_xspaced(txt, x1, xgap, ypos, ay, tx, ty) --> ok, err
if type(txt)~= "table" then return false, "[ArgErr: txt] object table expected" end
local chars = assert(txt.codepoint, "[InternalErr: txt] no 'codepoint' found")
local n = #chars
if n == 0 then return false, "[InternalErr: txt] no chars found" end
if type(x1) ~= "number" then return false, "[ArgErr: x1] number expected" end
if type(xgap) ~= "number" then return false, "[ArgErr: xgap] number expected" end
if xgap < 0 then
local n = #chars
x1 = x1 + (n - 1) * xgap
xgap = -xgap
end
if type(ypos) ~= "number" then return false, "[ArgErr: ypos] number expected" end
if ay == nil then
ay = 0
elseif type(ay) ~= "number" then
return false, "[ArgErr: ay] number expected"
end
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
x1 = x1 + tx
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
ypos = ypos + ty
end
local data = self._data
data[#data + 1] = 131
data[#data + 1] = x1 -- x-coordinate of the first axis from left to right
data[#data + 1] = xgap -- axial distance between gliphs
data[#data + 1] = ay -- anchor relative y-coordinate
data[#data + 1] = ypos -- text y-coordinate
for _, c in ipairs(chars) do
data[#data + 1] = c
end
data[#data + 1] = 0 -- end string signal
return true, nil
end
-- text_xwidth
-- tx optional translator x-vector
-- ty optional translator y-vector
-- text equally spaced but within [x1, x2] coordinate interval
-- <132> <ay: FLOAT> <x1: DIM> <x2: DIM> <y: DIM> <c: CHARS>
function gaCanvas:encode_Text_xwidth(txt, x1, x2, ypos, ay, tx, ty) --> ok, err
if type(txt)~= "table" then return false, "[ArgErr: txt] object table expected" end
if type(x1) ~= "number" then return false, "[ArgErr: x1] number expected" end
if type(x2) ~= "number" then return false, "[ArgErr: x2] number expected" end
if type(ypos) ~= "number" then return false, "[ArgErr: ypos] number expected" end
if ay == nil then
ay = 0
elseif type(ay) ~= "number" then
return false, "[ArgErr: ay] number expected"
end
local chars = assert(txt.codepoint, "[InternalErr: txt] no 'codepoint' found")
if #chars == 0 then return false, "[InternalErr: txt] no chars found" end
if x1 > x2 then x1, x2 = x2, x1 end -- reorder coordinates
if tx ~= nil then
if type(tx) ~= "number" then return false, "[ArgErr: tx] number expected" end
x1 = x1 + tx
x2 = x2 + tx
end
if ty ~= nil then
if type(ty) ~= "number" then return false, "[ArgErr: ty] number expected" end
ypos = ypos + ty
end
local data = self._data
data[#data + 1] = 132
data[#data + 1] = ay -- anchor relative y-coordinate
data[#data + 1] = x1 -- left limit of the text box
data[#data + 1] = x2 -- right limit of the text box
data[#data + 1] = ypos -- text y-coordinate
for _, c in ipairs(chars) do
data[#data + 1] = c
end
data[#data + 1] = 0 -- end string signal
return true, nil
end
-- experimental code section
-- new opcodes under assessment
-- [start_text_group] 140
function gaCanvas:start_text_group() --> ok, err
local data = self._data
data[#data + 1] = 140
return true, nil
end
-- [gtext] 141
function gaCanvas:gtext(chars) --> ok, err
if type(chars) ~= "table" then return false, "[ArgErr: chars] table expected" end
local data = self._data
data[#data + 1] = 141
for _, c in ipairs(chars) do
data[#data + 1] = c
end
data[#data + 1] = 0 -- end string signal
return true, nil
end
-- [gtext_spaced] 142 gap string
function gaCanvas:gtext_spaced(gap, chars) --> ok, err
if type(gap) ~= "number" then return false, "[ArgErr: gap] number expected" end
if type(chars) ~= "table" then return false, "[ArgErr: chars] table expected" end
local data = self._data
data[#data + 1] = 142
data[#data + 1] = gap
for _, c in ipairs(chars) do
data[#data + 1] = c
end
data[#data + 1] = 0 -- end string signal
return true, nil
end
-- [gtext_space] 143 gap
function gaCanvas:gtext_gap(gap) --> ok, err
if type(gap) ~= "number" then return false, "[ArgErr: gap] number expected" end
local data = self._data
data[#data + 1] = 143
data[#data + 1] = gap
return true, nil
end
-- [end_text_group] 149 ax ay x y
function gaCanvas:end_text_group(xpos, ypos, ax, ay) --> ok, err
if type(xpos) ~= "number" then return false, "[ArgErr: xpos] '' number expected" end
if type(ypos) ~= "number" then return false, "[ArgErr: ypos] number expected" end
if type(ax) ~= "number" then return false, "[ArgErr: ax] number expected" end
if type(ay) ~= "number" then return false, "[ArgErr: ay] number expected" end
local data = self._data
data[#data + 1] = 149
data[#data + 1] = ax -- anchor relative x-coordinate
data[#data + 1] = ay -- anchor relative y-coordinate
data[#data + 1] = xpos -- text x-coordinate
data[#data + 1] = ypos -- text y-coordinate
return true, nil
end
return gaCanvas
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