led_marquee/init.lua

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Lua
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-- simple LED marquee mod
-- by Vanessa Dannenberg
led_marquee = {}
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local S
if minetest.get_modpath("intllib") then
S = intllib.make_gettext_pair()
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else
S = function(s) return s end
end
local color_to_char = {
"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R"
}
local char_to_color = {
["0"] = 0,
["1"] = 1,
["2"] = 2,
["3"] = 3,
["4"] = 4,
["5"] = 5,
["6"] = 6,
["7"] = 7,
["8"] = 8,
["9"] = 9,
["A"] = 10,
["B"] = 11,
["C"] = 12,
["D"] = 13,
["E"] = 14,
["F"] = 15,
["G"] = 16,
["H"] = 17,
["I"] = 18,
["J"] = 19,
["K"] = 20,
["L"] = 21,
["M"] = 22,
["N"] = 23,
["O"] = 24,
["P"] = 25,
["Q"] = 26,
["R"] = 27,
["a"] = 10,
["b"] = 11,
["c"] = 12,
["d"] = 13,
["e"] = 14,
["f"] = 15,
["g"] = 16,
["h"] = 17,
["i"] = 18,
["j"] = 19,
["k"] = 20,
["l"] = 21,
["m"] = 22,
["n"] = 23,
["o"] = 24,
["p"] = 25,
["q"] = 26,
["r"] = 27
}
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-- the following functions based on the so-named ones in Jeija's digilines mod
local reset_meta = function(pos)
minetest.get_meta(pos):set_string("formspec", "field[channel;Channel;${channel}]")
end
local on_digiline_receive_std = function(pos, node, channel, msg)
local meta = minetest.get_meta(pos)
local setchan = meta:get_string("channel")
if setchan ~= channel then return end
local num = tonumber(msg)
if msg == "colon" or msg == "period" or msg == "off" or (num and (num >= 0 and num <= 9)) then
minetest.swap_node(pos, { name = "led_marquee:marquee_"..msg, param2 = node.param2})
end
end
-- convert Lua's idea of a UTF-8 char to ISO-8859-1
-- first char is non-break space, 0xA0
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local iso_chars=" ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
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local get_iso = function(c)
local hb = string.byte(c,1) or 0
local lb = string.byte(c,2) or 0
local dec = lb+hb*256
local char = dec - 49664
if dec > 49855 then char = dec - 49856 end
return char
end
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local make_iso = function(s)
local i = 1
local s2 = ""
while i <= string.len(s) do
if string.byte(s,i) > 159 then
s2 = s2..string.char(get_iso(string.sub(s, i, i+1)))
i = i + 2
else
s2 = s2..string.sub(s, i, i)
i = i + 1
end
end
return s2
end
-- scrolling
led_marquee.set_timer = function(pos, timeout)
local timer = minetest.get_node_timer(pos)
timer:stop()
if timeout > 0 then
local meta = minetest.get_meta(pos)
timer:start(timeout)
end
end
led_marquee.scroll_text = function(pos, elapsed, skip)
local meta = minetest.get_meta(pos)
local msg = meta:get_string("last_msg")
local channel = meta:get_string("channel")
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local index = meta:get_int("index")
local color = meta:get_int("last_color")
local colorchar = color_to_char[color+1]
if not index or index < 1 or not string.byte(msg, index) then index = 1 end
local len = string.len(msg)
skip = skip or 1
index = index + skip
-- search backward to find the most recent color code in the string
local r = index
while r > 0 and not string.match(string.sub(msg, r, r+1), "/[0-9A-Ra-r]") do
r = r - 1
end
if r == 0 then r = 1 end
if string.match(string.sub(msg, r, r+1), "/[0-9A-Ra-r]") then
colorchar = string.sub(msg, r+1, r+1)
end
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-- search forward to find the next printable symbol after the current index
local f = index
while f < len do
if string.match(string.sub(msg, f, f+1), "/[0-9A-Ra-r]") then
f = f + 2
else
break
end
end
led_marquee.display_msg(pos, channel, "/"..colorchar..string.sub(msg, f)..string.rep(" ", skip + 1))
meta:set_int("index", f)
if not elapsed or elapsed < 0.5 then return false end
return true
end
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-- the nodes:
local fdir_to_right = {
{ 0, -1 },
{ 0, -1 },
{ 0, -1 },
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{ 0, 1 },
{ 1, 0 },
{ -1, 0 },
}
local cbox = {
type = "wallmounted",
wall_top = { -8/16, 7/16, -8/16, 8/16, 8/16, 8/16 },
wall_bottom = { -8/16, -8/16, -8/16, 8/16, -7/16, 8/16 },
wall_side = { -8/16, -8/16, -8/16, -7/16, 8/16, 8/16 }
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}
led_marquee.decode_color = function(msg)
end
led_marquee.display_msg = function(pos, channel, msg)
msg = string.sub(msg, 1, 6144).." "
if string.sub(msg,1,1) == string.char(255) then -- treat it as incoming UTF-8
msg = make_iso(string.sub(msg, 2, 6144))
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end
local master_fdir = minetest.get_node(pos).param2 % 8
local master_meta = minetest.get_meta(pos)
local last_color = master_meta:get_int("last_color")
local pos2 = table.copy(pos)
if not last_color or last_color < 0 or last_color > 27 then
last_color = 0
master_meta:set_int("last_color", 0)
end
local i = 1
local len = string.len(msg)
local wrapped = nil
while i <= len do
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local node = minetest.get_node(pos2)
local fdir = node.param2 % 8
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local meta = minetest.get_meta(pos2)
local setchan = nil
if meta then setchan = meta:get_string("channel") end
local asc = string.byte(msg, i, i)
if not string.match(node.name, "led_marquee:char_") then
if not wrapped then
pos2.x = pos.x
pos2.y = pos2.y-1
pos2.z = pos.z
wrapped = true
else
break
end
elseif string.match(node.name, "led_marquee:char_")
and fdir ~= master_fdir or (setchan ~= nil and setchan ~= "" and setchan ~= channel) then
break
elseif asc == 10 then
pos2.x = pos.x
pos2.y = pos2.y-1
pos2.z = pos.z
i = i + 1
wrapped = nil
elseif asc == 29 then
local c = string.byte(msg, i+1, i+1) or 0
local r = string.byte(msg, i+2, i+2) or 0
pos2.x = pos.x + (fdir_to_right[fdir+1][1])*c
pos2.y = pos.y - r
pos2.z = pos.z + (fdir_to_right[fdir+1][2])*c
i = i + 3
wrapped = nil
elseif asc == 30 then -- translate to slash for printing
minetest.swap_node(pos2, { name = "led_marquee:char_47", param2 = master_fdir + (last_color*8)})
pos2.x = pos2.x + fdir_to_right[fdir+1][1]
pos2.z = pos2.z + fdir_to_right[fdir+1][2]
i = i + 1
elseif asc == 47 then -- slash
local ccode = string.sub(msg, i+1, i+1)
if ccode then
if char_to_color[ccode] then
last_color = char_to_color[ccode]
i = i + 2
else
minetest.swap_node(pos2, { name = "led_marquee:char_47", param2 = master_fdir + (last_color*8)})
pos2.x = pos2.x + fdir_to_right[fdir+1][1]
pos2.z = pos2.z + fdir_to_right[fdir+1][2]
i = i + 1
end
end
master_meta:set_int("last_color", last_color)
wrapped = nil
elseif asc > 30 and asc < 256 then
minetest.swap_node(pos2, { name = "led_marquee:char_"..asc, param2 = master_fdir + (last_color*8)})
pos2.x = pos2.x + fdir_to_right[fdir+1][1]
pos2.z = pos2.z + fdir_to_right[fdir+1][2]
i = i + 1
wrapped = nil
else
i = i + 1
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end
end
end
local on_digiline_receive_string = function(pos, node, channel, msg)
local meta = minetest.get_meta(pos)
local setchan = meta:get_string("channel")
local last_color = meta:get_int("last_color")
if not last_color or last_color < 0 or last_color > 27 then
last_color = 0
meta:set_int("last_color", 0)
end
local fdir = node.param2 % 8
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if setchan ~= channel then return end
if msg and msg ~= "" and type(msg) == "string" then
if string.len(msg) > 1 then
if msg == "clear" then
led_marquee.set_timer(pos, 0)
msg = string.rep(" ", 2048)
meta:set_string("last_msg", msg)
led_marquee.display_msg(pos, channel, msg)
meta:set_int("index", 1)
elseif msg == "allon" then
led_marquee.set_timer(pos, 0)
msg = string.rep(string.char(144), 2048)
meta:set_string("last_msg", msg)
led_marquee.display_msg(pos, channel, msg)
meta:set_int("index", 1)
elseif msg == "start_scroll" then
local timeout = meta:get_int("timeout")
if not timeout or timeout < 0.5 or timeout > 5 then timeout = 0 end
led_marquee.set_timer(pos, timeout)
elseif msg == "stop_scroll" then
led_marquee.set_timer(pos, 0)
return
elseif string.sub(msg, 1, 12) == "scroll_speed" then
local timeout = tonumber(string.sub(msg, 13))
if not timeout or timeout < 0.5 or timeout > 5 then timeout = 0 end
meta:set_int("timeout", timeout)
led_marquee.set_timer(pos, timeout)
elseif string.sub(msg, 1, 11) == "scroll_step" then
local skip = tonumber(string.sub(msg, 12))
led_marquee.scroll_text(pos, nil, skip)
elseif msg == "get" then -- get the master panel's displayed char as ASCII numerical value
digilines.receptor_send(pos, digiline.rules.default, channel, tonumber(string.match(minetest.get_node(pos).name,"led_marquee:char_(.+)"))) -- wonderfully horrible string manipulaiton
elseif msg == "getstr" then -- get the last stored message
digilines.receptor_send(pos, digiline.rules.default, channel, meta:get_string("last_msg"))
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elseif msg == "getindex" then -- get the scroll index
digilines.receptor_send(pos, digiline.rules.default, channel, meta:get_int("index"))
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else
msg = string.gsub(msg, "//", string.char(30))
led_marquee.set_timer(pos, 0)
meta:set_string("last_msg", msg)
led_marquee.display_msg(pos, channel, msg)
meta:set_int("index", 1)
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end
else
local asc = string.byte(msg)
if asc > 29 and asc < 256 then
minetest.swap_node(pos, { name = "led_marquee:char_"..asc, param2 = fdir + (last_color*8)})
meta:set_string("last_msg", tostring(msg))
meta:set_int("index", 1)
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end
end
elseif msg and type(msg) == "number" then
meta:set_string("last_msg", tostring(msg))
led_marquee.display_msg(pos, channel, tostring(msg))
meta:set_int("index", 1)
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end
end
-- the nodes!
for i = 31, 255 do
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local groups = { cracky = 2, not_in_creative_inventory = 1}
local light = LIGHT_MAX-2
local description = S("Alphanumeric LED marquee panel ("..i..")")
local tiles = {
{ name="led_marquee_base.png", color="white"},
{ name="led_marquee_leds_off.png", color="white"},
"led_marquee_char_"..i..".png",
}
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if i == 31 then
tiles = {
{ name="led_marquee_base.png", color="white"},
{ name="led_marquee_leds_off.png", color="white"},
{
name = "led_marquee_char_31.png",
animation = {type = "vertical_frames", aspect_w = 32, aspect_h = 32, length = 0.75}
}
}
end
if i == 32 then
groups = {cracky = 2}
light = nil
description = S("Alphanumeric LED marquee panel")
end
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minetest.register_node("led_marquee:char_"..i, {
description = description,
drawtype = "mesh",
mesh = "led_marquee.obj",
tiles = tiles,
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palette="led_marquee_palette.png",
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use_texture_alpha = true,
groups = groups,
paramtype = "light",
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paramtype2 = "colorwallmounted",
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light_source = light,
selection_box = cbox,
node_box = cbox,
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on_construct = function(pos)
reset_meta(pos)
end,
on_receive_fields = function(pos, formname, fields, sender)
if (fields.channel) then
minetest.get_meta(pos):set_string("channel", fields.channel)
end
end,
digiline = {
receptor = {},
effector = {
action = on_digiline_receive_string,
},
},
drop = "led_marquee:char_32",
on_timer = led_marquee.scroll_text
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})
end
-- crafts
minetest.register_craft({
output = "led_marquee:char_32 6",
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recipe = {
{ "default:glass", "default:glass", "default:glass" },
{ "mesecons_lamp:lamp_off", "mesecons_lamp:lamp_off", "mesecons_lamp:lamp_off" },
{ "group:wood", "mesecons_microcontroller:microcontroller0000", "group:wood" }
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},
})