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local tx = {}
setmetatable(tx, {__call = function(_, ...) return tx.base(...) end})
function tx.escape(str)
return (string.gsub(tostring(str), [[([%^:\])]], [[\%1]]))
end
local function getargs(...)
return select("#", ...), {...}
end
local function curry(f, x)
return function(...)
return f(x, ...)
end
end
local function xmkmodifier(func)
return function(self, ...)
table.insert(self, (func(...)))
return self
end
end
local function mkmodifier(fmt, spec)
return xmkmodifier(function(...)
local count = select("#", ...)
local args = {...}
for k, f in pairs(spec) do
args[k] = f(args[k])
end
return string.format(fmt, unpack(args, 1, count))
end)
end
-- Texture object
local tx_lib = {}
local tx_mt = {
__index = tx_lib,
__tostring = function(self)
return table.concat(self, "^")
end,
__concat = function(a, b)
return tx.raw(("%s^%s"):format(tostring(a), tostring(b)))
end,
}
function tx.raw(str)
return setmetatable({str}, tx_mt)
end
function tx.base(str)
return tx.raw(tx.escape(str))
end
-- TODO: use [fill when 5.8.0 becomes widely used client-side
function tx.fill(w, h, color)
return tx"advtrains_hud_bg.png":resize(w, h):colorize(color)
end
-- Most texture modifiers
tx_lib.colorize = xmkmodifier(function(c, a)
local str = ("[colorize:%s"):format(tx.escape(c))
if a then
str = str .. ":" .. a
end
return str
end)
tx_lib.multiply = mkmodifier("[multiply:%s", {tx.escape})
tx_lib.resize = mkmodifier("[resize:%dx%d", {})
tx_lib.transform = mkmodifier("[transform%s", {tx.escape})
-- [combine
local combine = {}
function combine:add(x, y, ent)
table.insert(self.st, ([[%d,%d=%s]]):format(x, y, tx.escape(tostring(ent))))
return self
end
local combine_mt = {
__index = combine,
__tostring = function(self)
return table.concat(self.st, ":")
end,
}
function tx.combine(w, h, bg)
local base = ("[combine:%dx%d"):format(w, h)
local obj = setmetatable({width = w, height = h, st = {base}}, combine_mt)
if bg then
obj:add_fill(0, 0, w, h, bg)
end
return obj
end
function combine:add_fill(x, y, ...)
return self:add(x, y, tx.fill(...))
end
local function add_multicolor_fill(n, self, x, y, w, h, ...)
local argc, argv = getargs(...)
local t = 0
for k = 1, argc, 2 do
t = t + argv[k]
end
local newargs = {x, y, w, h}
local sk, wk = n, n+2
local s = newargs[wk]/t
for k = 1, argc, 2 do
local v = argv[k] * s
newargs[wk] = v
newargs[5] = argv[k+1]
self:add_fill(unpack(newargs))
newargs[sk] = newargs[sk] + v
end
return self
end
combine.add_multicolor_fill_topdown = curry(add_multicolor_fill, 2)
combine.add_multicolor_fill_leftright = curry(add_multicolor_fill, 1)
local function add_segmentbar(n, self, x, y, w, h, m, c, ...)
local argc, argv = getargs(...)
local baseargs = {x, y, w, h}
local ss = (baseargs[n+2]+m)/c
local bs = ss - m
for k = 1, argc, 3 do
local lower, upper, fill = argv[k], argv[k+1], argv[k+2]
lower = math.max(0, math.floor(lower)+1)
upper = math.min(c, math.floor(upper))
if lower < upper then
local args = {x, y, w, h, fill}
args[n+2] = bs
args[n] = args[n] + ss*lower
for i = lower, upper do
self:add_fill(unpack(args))
args[n] = args[n] + ss
end
end
end
return self
end
combine.add_segmentbar_topdown = curry(add_segmentbar, 2)
combine.add_segmentbar_leftright = curry(add_segmentbar, 1)
local function add_lever(n, self, x, y, w, h, hs, ss, val, hf, sf)
local baseargs = {x, y, w, h}
local sargs = {x, y, w, h, sf}
sargs[5-n] = ss
sargs[n+2] = baseargs[n+2] + ss - hs
for k = 1, 2 do
sargs[k] = baseargs[k] + (baseargs[k+2] - sargs[k+2])/2
end
self:add_fill(unpack(sargs))
local hargs = {x, y, w, h, hf}
hargs[n+2] = hs
hargs[n] = baseargs[n] + (baseargs[n+2]-hs)*val
self:add_fill(unpack(hargs))
return self
end
combine.add_lever_topdown = curry(add_lever, 2)
combine.add_lever_leftright = curry(add_lever, 1)
--[[ Seven-segment display
-1-
6 2
-7-
5 3
-4-
--]]
local sevenseg_digits = {
["0"] = {1, 2, 3, 4, 5, 6},
["1"] = {2, 3},
["2"] = {1, 2, 4, 5, 7},
["3"] = {1, 2, 3, 4, 7},
["4"] = {2, 3, 6, 7},
["5"] = {1, 3, 4, 6, 7},
["6"] = {1, 3, 4, 5, 6, 7},
["7"] = {1, 2, 3},
["8"] = {1, 2, 3, 4, 5, 6, 7},
["9"] = {1, 2, 3, 4, 6, 7},
}
function combine:add_str7seg(x0, y0, tw, th, str, fill)
--[[ w and h (as width/height of individual (horizontal) segments) have the following properties:
tw = n(w+3h)-h
th = 2w+3h
--]]
local len = #str
local h = (2*tw-len*th)/(3*len-2)
local w = (th-3*h)/2
local ws = w+3*h
local segs = {
{h, 0, w, h},
{w+h, h, h, w},
{w+h, w+2*h, h, w},
{h, 2*(w+h), w, h},
{0, w+2*h, h, w},
{0, h, h, w},
{h, w+h, w, h},
}
for i = 1, len do
for _, k in pairs(sevenseg_digits[string.sub(str, i, i)] or {}) do
local s = segs[k]
self:add_fill(s[1]+x0, s[2]+y0, s[3], s[4], fill)
end
x0 = x0 + ws
end
return self
end
function combine:add_n7seg(x, y, w, h, n, prec, ...)
if not (type(n) == "number" and type(prec) == "number") then
error("passed non-numeric value or precision to numeric display")
elseif prec < 0 then
error("negative length")
end
local pfx = ""
if n >= 0 then
n = math.min(10^prec-1, n)
else
n = math.min(10^(prec-1)-1, -n)
pfx = "-"
end
local str = ("%d"):format(n)
return self:add_str7seg(x, y, w, h, pfx .. ("0"):rep(prec-#str-#pfx) .. str, ...)
end
return tx
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