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|
require("lualibs-lpeg")
local luakeys = require("luakeys")
pixelart = {
_debug = false,
_counter = 0,
}
--------------------------------------------------------------------------------
--[[ Debug on/off
--]]
local function pixelart_setpixelartdebug(flag)
luakeys.opts.debug = flag
pixelart._debug = flag
end
pixelart.setpixelartdebug = pixelart_setpixelartdebug
pixelart.setpixelartdebug = pixelart_setpixelartdebug
--------------------------------------------------------------------------------
--[[ Print
--]]
local function tex_sprint(text)
tex.sprint(text)
if pixelart._debug then
io.write(text)
end
end
local function tex_print(text)
tex.print(text)
if pixelart._debug then
io.write(text, "\n")
end
end
--------------------------------------------------------------------------------
--[[ Define and use colors
-- ]]
pixelart._colors = {}
local function pixelart_parsecolors(argument)
return luakeys.parse(
argument,
{
naked_as_value = true,
hooks = {
keys = function(key, value, depth, current, result)
return tostring(key), value
end,
}
}
)
end
local function pixelart_newpixelartcolors(name, argument)
if pixelart._colors[name] == nil then
pixelart._colors[name] = pixelart_parsecolors(argument)
else
error(string.format("Error: Colors '%s' is already defined.", name))
end
end
local function pixelart_renewpixelartcolors(name, argument)
pixelart._colors[name] = pixelart_parsecolors(argument)
end
pixelart.newpixelartcolors = pixelart_newpixelartcolors
pixelart.renewpixelartcolors = pixelart_renewpixelartcolors
-- Default color sets
pixelart._colors["explicit"] = {}
pixelart._colors["RGB"] = {
R = "red",
G = "green",
B = "blue",
W = "white",
K = "black"
}
pixelart._colors["BW"] = {
["0"] = "white",
["1"] = "black",
}
pixelart._colors["gray"] = {
["0"] = "white",
["1"] = "white!89!black",
["2"] = "white!78!black",
["3"] = "white!67!black",
["4"] = "white!56!black",
["5"] = "white!44!black",
["6"] = "white!33!black",
["7"] = "white!22!black",
["8"] = "white!11!black",
["9"] = "black",
}
pixelart._colors["mono"] = {}
for _, char in pairs(string.explode("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", "")) do
pixelart._colors["mono"][char] = ""
end
--------------------------------------------------------------------------------
--[[ Options
--]]
local ALGORITHMS = {squares = true, stack = true}
local function parse(str, default)
local parser = luakeys.define({
tikz = {},
colors = {
process = function(value, input, result, unknown)
-- If argument is a string, convert numeric keys into strings
if type(value) ~= "table" then
return value
end
local converted = {}
for k, v in pairs(value) do
converted[tostring(k)] = v
end
return converted
end,
},
margin = {
data_type = "number",
default = 0,
always_present = true,
},
style = {
data_type = "string",
default = "pixelart",
always_present = true,
},
squares = {
exclusive_group = "algo",
},
stack = {
exclusive_group = "algo",
},
draft = {
data_type = "boolean",
},
})
options = parser(str, {
defaults = default,
})
-- Algo option
local algo = nil
for key, value in pairs(ALGORITHMS) do
if options[key] then
algo = key
end
end
if not algo then
options[pixelart._default_algo[1]] = pixelart._default_algo[2]
end
-- Convert Tikz option back to string
if type(options.tikz) == type({}) then
options.tikz = luakeys.render(options.tikz)
end
return options
end
local DEFAULT = {colors = "mono"}
local function pixelart_setpixelartdefault(str)
pixelart._default = parse(str, DEFAULT)
for key, value in pairs(pixelart._default) do
if ALGORITHMS[key] then
pixelart._default_algo = {key, value}
pixelart._default[key] = nil
end
end
end
pixelart._default = {colors = "mono"}
pixelart._default_algo = {"stack", {}}
pixelart.setpixelartdefault = pixelart_setpixelartdefault
--------------------------------------------------------------------------------
--[[ Parse pixelart string
--Parse arguments, and build a table of tables.
--]]
--
local lineRE = lpeg.Ct(
-- Regular expression to match a line of colors
(
(lpeg.P("{") * lpeg.C((lpeg.P(1) - lpeg.S("{}"))^0) * lpeg.P("}"))
+
lpeg.C((lpeg.P(1) - lpeg.S("{}")))
)^0
)
local function str2arrays(str)
-- Turn the \pixelart{} argument into a table (of lines) of tables (of colors).
-- Trim string: remove leading and trailing whitespaces
str = str:gsub("^%s*(.-)%s*$", "%1")
-- Turn it into a table (which is called "array" not to clash with the "table" library)
local array = {}
for k, line in ipairs(string.explode(str, " ")) do
array[k] = lineRE:match(line)
end
-- Ensure each row has the same number of columns
local length = 0
for k, line in ipairs(array) do
if #line > length then
length = #line
end
end
for k, line in ipairs(array) do
if #line < length then
for i=#line+1, length do
line[i] = false
end
end
end
-- Flip array so that flipped[x][y] gives the pixel with coordinates (x, y), in the standard frame
local flipped = {}
for y, line in ipairs(array) do
for x, color in ipairs(array[y]) do
if y == 1 then
flipped[x] = {}
end
flipped[x][#array - y + 1] = color
end
end
return flipped
end
--------------------------------------------------------------------------------
--[[ Color tools
--]]
local function color2color(colors, color)
-- Convert a color (as given by the user) into a color (usable by TikZ).
if color == "." or not color then
-- Transparent pixel: do not print anything
return nil
elseif colors[color] and colors[color] ~= "" then
-- A color has been defined: use it
return string.format("color=%s", colors[color])
elseif colors[color] and colors[color] == "" then
-- An empty color has been defined: use the default TikZ color
return ""
else
-- No color has been defined: use the argument as the TikZ color
return color
end
end
--------------------------------------------------------------------------------
-- Turn pixelart string into TikZ code, using the SQUARES algorithm
local function pixelart_body_squares(array, colors, options)
-- Draw the tikz pixels, as a set of squares.
tex_print(string.format(
[[\clip ({0-%s}, {0-%s}) rectangle (%s, %s); ]],
options.margin,
options.margin,
#array + options.margin,
#array[1] + options.margin
))
for x, column in ipairs(array) do
for y, color in ipairs(column) do
color = color2color(colors, color)
---------------------
-- Which pixel size?
local overlap
if type(options.squares) == type({}) then
overlap = options.squares["overlap"] or "0"
else
overlap = "0"
end
---------------------
-- At last, we can display the pixel…
if color ~= nil then
tex_print(string.format([[\fill[%s, %s] (%s, %s) rectangle ++(1+%s, 1+%s);]],
options.style,
color,
string.format("{%s-%s}", x-1, overlap),
string.format("{%s-%s}", y-1, overlap),
2*overlap,
2*overlap
))
end
end
end
end
--------------------------------------------------------------------------------
-- Turn pixelart string into TikZ code, using the STACK algorithm
local function remove_zone(write, coord, read)
-- Remove the zone of the pixel `coord`
-- If both write and read are present (they are expected to be 2D-arrays of the same size, then read zones from `read`, and remove them from `write`.
-- Default values for options
if read == nil then
read = write
end
if colorblind == nil then
colorblind = false
end
local originalcolor = read[coord[1]][coord[2]]
local samecolor = function(color) return color == originalcolor end
-- Go!
local stack = {}
table.insert(stack, coord)
while #stack ~= 0 do
local current = table.remove(stack)
for _, neighbour in pairs({
{current[1]-1, current[2]},
{current[1]+1, current[2]},
{current[1], current[2]-1},
{current[1], current[2]+1},
}) do
if (
neighbour[1] >= 1 and neighbour[1] <= #read -- First coordinate inside the array
and
neighbour[2] >= 1 and neighbour[2] <= #read[1] -- Second coordinate inside the array
and
write[neighbour[1]][neighbour[2]] -- Not processed yet
and
samecolor(read[neighbour[1]][neighbour[2]]) -- Same color
) then
table.insert(stack, neighbour)
end
end
write[current[1]][current[2]] = false
end
end
local border_transitions = {
westtop = {
tests = {
{1, 1},
{1, 0},
},
next = {
["true true"] = {
step = {1, 1},
state = "northleft",
mark = {0, 0},
},
["false true"] = {
step = {1, 0},
state = "westtop",
mark = nil,
},
["true false"] = {
step = {0, 0},
state = "southright",
mark = {1, 1},
},
["false false"] = {
step = {0, 0},
state = "southright",
mark = {1, 1},
},
},
},
northleft = {
tests = {
{-1, 1},
{0, 1},
},
next = {
["true true"] = {
step = {-1, 1},
state = "eastbottom",
mark = {1, 0},
},
["true false"] = {
step = {0, 0},
state = "westtop",
mark = {0, 1},
},
["false true"] = {
step = {0, 1},
state = "northleft",
mark = nil,
},
["false false"] = {
step = {0, 0},
state = "westtop",
mark = {0, 1},
},
},
},
southright = {
tests = {
{0, -1},
{1, -1},
},
next = {
["true true"] = {
step = {1, -1},
state = "westtop",
mark = {0, 1},
},
["false true"] = {
step = {0, 0},
state = "eastbottom",
mark = {1, 0},
},
["true false"] = {
step = {0, -1},
state = "southright",
mark = nil,
},
["false false"] = {
step = {0, 0},
state = "eastbottom",
mark = {1, 0},
},
},
},
eastbottom = {
tests = {
{-1, 0},
{-1, -1},
},
next = {
["true true"] = {
step = {-1, -1},
state = "southright",
mark = {1, 1},
},
["false true"] = {
step = {0, 0},
state = "northleft",
mark = {0, 0},
},
["true false"] = {
step = {-1, 0},
state = "eastbottom",
mark = nil,
},
["false false"] = {
step = {0, 0},
state = "northleft",
mark = {0, 0},
},
},
},
}
local function iter_border(array, start, colorblind)
-- If colorblind==true, all colors are considered the same (that is, a pixel is either transparent or colored, with no difference between the colors)
local samecolor
if colorblind then
samecolor = function(current, test)
if (
current[1] + test[1] < 1
or
current[1] + test[1] > #array
) then
return false
end
color = array[current[1] + test[1]][current[2] + test[2]]
if color == nil or color == false then
return false
end
return (
color == "." and array[start[1]][start[2]] == "."
) or (
color ~= "." and array[start[1]][start[2]] ~= "."
)
end
else
samecolor = function(current, test)
if (
current[1] + test[1] < 1
or
current[1] + test[1] > #array
) then
return false
end
color = array[current[1] + test[1]][current[2] + test[2]]
return color == array[start[1]][start[2]]
end
end
local current = {start[1], start[2]}
local state = "northleft"
return function()
while true do
tests = border_transitions[state].tests
local transition = border_transitions[state].next[string.format(
"%s %s",
samecolor(current, tests[1]),
samecolor(current, tests[2])
)]
state = transition.state
current = {
current[1] + transition.step[1],
current[2] + transition.step[2]
}
if transition.mark then
if current[1] == start[1] and current[2] == start[2] and state == "northleft" then
return
else
return {
current[1] + transition.mark[1],
current[2] + transition.mark[2],
}
end
end
end
end
end
local function iter_unprocessed_zones(array)
-- Iterate coordinates of pixels that haven't been processed yet (their value is not false)
local x = 1
local y = 1
return function()
while not array[x][y] do
x = x + 1
if x > #array then
x = 1
y = y + 1
if y > #array[1] then
return
end
end
end
return {x, y}
end
end
local function pixelart_body_stack(array, colors, options)
-- The first argument is an array of lines, each of them being an array of colors (i.e. color of the first pixel of the line, color of the second pixel of the line, etc).
-- Some "colors" have meaning:
-- - false (the boolean): pixel has already been processed
-- - "." (the character dot): pixel is transparent
-- - anything else: the color of the pixel
if #array == 0 then
return
end
tex_print([[\begin{scope}[even odd rule] ]])
-- Clip away transparent zones
tex_print(string.format(
[[\clip ({0-%s}, {0-%s}) rectangle (%s, %s) ]],
options.margin,
options.margin,
#array + options.margin,
#array[1] + options.margin
))
for x = 1, #array do
for y = 1, #array[x] do
if array[x][y] == "." then
tex_print(string.format("(%s, %s) rectangle ++(1, 1) ", x-1, y-1))
end
end
end
tex_print(";")
-- Draw color zones
for current in iter_unprocessed_zones(array) do
local color = color2color(colors, array[current[1]][current[2]])
if color == nil then
-- Nothing to do: transparent zone
else
tex_sprint(string.format([[\fill[%s, %s] (%s, %s) ]], options.style, color, current[1]-1, current[2]-1))
for coord in iter_border(array, current, false) do
tex_sprint(string.format([[ -- (%s, %s) ]], coord[1]-1, coord[2]-1))
end
tex_print(string.format([[ -- cycle ;]]))
end
remove_zone(array, {current[1], current[2]})
end
tex_print([[\end{scope} ]])
end
--------------------------------------------------------------------------------
-- Functions pixelart() and tikzpixelart()
local function pixelart_body(str, options)
-- Debug
pixelart._counter = pixelart._counter + 1
if pixelart._debug then
io.write("\n%", str, "\n")
io.write("% pixelart ", pixelart._counter, ", file ", status.filename, ", input line ", tex.inputlineno, "\n")
else
io.write("(pixelart ", pixelart._counter, ", file ", status.filename, ", input line ", tex.inputlineno)
end
-- Colors
local colors
if type(options.colors) == "table" then
colors = options.colors
else
colors = pixelart._colors[options.colors]
end
if (pixelart._draft or options.draft) and options.draft ~= false then
local array = str2arrays(str)
tex_print(string.format(
[[ \draw[pattern=checkerboard] (0, 0) rectangle (%s, %s); ]],
#array, #array[1]
))
elseif options.stack then
pixelart_body_stack(str2arrays(str), colors, options)
else -- options.squares is the default
pixelart_body_squares(str2arrays(str), colors, options)
end
if pixelart._debug then
-- Nothing
else
io.write(")")
end
end
local function pixelart_tikzpixelart(coord, str, options)
-- Parse options
local options = parse(options, pixelart._default)
if options.tikz then
tex_sprint(string.format([[\begin{scope}[%s] ]], options.tikz))
end
tex_print(string.format(
[[\begin{scope}[shift={%s}] ]],
coord
))
pixelart_body(str, options)
tex_print([[\end{scope} ]])
if options.tikz then
tex_print([[\end{scope} ]])
end
end
local function pixelart_pixelart(str, options)
-- Parse options
local options = parse(options, pixelart._default)
-- Tikz environment
tex_print([[\begin{tikzpicture}]])
if options.tikz then
tex_sprint(string.format("[%s]", options.tikz))
end
pixelart_body(str, options)
tex_print([[\end{tikzpicture}]])
end
pixelart.pixelart = pixelart_pixelart
pixelart.tikzpixelart = pixelart_tikzpixelart
|