1 files changed, 234 insertions, 0 deletions
diff --git a/digilines_lcd/init.lua b/digilines_lcd/init.lua
new file mode 100644
index 0000000..2f7cad8
--- /dev/null
+++ b/digilines_lcd/init.lua
@@ -0,0 +1,234 @@
+--* parts are currently not possible because you cannot set the pitch of an entity from lua
+
+-- Font: 04.jp.org
+
+-- load characters map
+local chars_file = io.open(minetest.get_modpath("digilines_lcd").."/characters", "r")
+local charmap = {}
+local max_chars = 12
+if not chars_file then
+	print("[digilines_lcd] E: character map file not found")
+else
+	while true do
+		local char = chars_file:read("*l")
+		if char == nil then
+			break
+		end
+		local img = chars_file:read("*l")
+		chars_file:read("*l")
+		charmap[char] = img
+	end
+end
+
+local lcds = {
+	-- on ceiling
+	--* [0] = {delta = {x = 0, y = 0.4, z = 0}, pitch = math.pi / -2},
+	-- on ground
+	--* [1] = {delta = {x = 0, y =-0.4, z = 0}, pitch = math.pi /  2},
+	-- sides
+	[2] = {delta = {x =  0.4, y = 0, z = 0}, yaw = math.pi / -2},
+	[3] = {delta = {x = -0.4, y = 0, z = 0}, yaw = math.pi /  2},
+	[4] = {delta = {x = 0, y = 0, z =  0.4}, yaw = 0},
+	[5] = {delta = {x = 0, y = 0, z = -0.4}, yaw = math.pi},
+}
+
+local reset_meta = function(pos)
+	minetest.env:get_meta(pos):set_string("formspec", "field[channel;Channel;${channel}]")
+end
+
+local clearscreen = function(pos)
+	local objects = minetest.env:get_objects_inside_radius(pos, 0.5)
+	for _, o in ipairs(objects) do
+		if o:get_entity_name() == "digilines_lcd:text" then
+			o:remove()
+		end
+	end
+end
+
+local prepare_writing = function (pos)
+	lcd_info = lcds[minetest.env:get_node(pos).param2]
+	if lcd_info == nil then return end
+	local text = minetest.env:add_entity(
+		{x = pos.x + lcd_info.delta.x,
+		 y = pos.y + lcd_info.delta.y,
+		 z = pos.z + lcd_info.delta.z}, "digilines_lcd:text")
+	text:setyaw  (lcd_info.yaw or 0)
+	--* text:setpitch(lcd_info.yaw or 0)
+	return text
+end
+
+local on_digiline_receive = function(pos, node, channel, msg)
+	clearscreen(pos)
+	local setchan = minetest.env:get_meta(pos):get_string("channel")
+	if setchan ~= channel then return end
+
+	local text = prepare_writing (pos)
+	text:set_properties({textures={generate_texture(create_lines(msg))}})
+end
+
+local lcd_box = {
+	type = "wallmounted",
+	wall_top    = {-8/16,  7/16, -8/16,  8/16,  8/16, 8/16}
+}
+
+minetest.register_node("digilines_lcd:lcd", {
+	drawtype = "nodebox",
+	description = "Digiline LCD",
+	inventory_image = "lcd_lcd.png",
+	wield_image = "lcd_lcd.png",
+	tiles = {"lcd_anyside.png"},
+
+	paramtype = "light",
+	sunlight_propagates = true,
+	paramtype2 = "wallmounted",
+	node_box = lcd_box,
+	selection_box = lcd_box,
+	groups =  {choppy = 3, dig_immediate = 2},
+
+	after_place_node = function (pos, placer, itemstack)
+		local param2 = minetest.env:get_node(pos).param2
+		if param2 == 0 or param2 == 1 then
+			minetest.env:add_node(pos, {name = "digilines_lcd:lcd", param2 = 3})
+		end
+		prepare_writing (pos)
+	end,
+
+	on_construct = function(pos)
+		reset_meta(pos)
+	end,
+
+	on_destruct = function(pos)
+		clearscreen(pos)
+	end,
+
+	on_receive_fields = function(pos, formname, fields, sender)
+		minetest.env:get_meta(pos):set_string("channel", fields.channel)
+	end,
+
+	digiline = 
+	{
+		receptor = {},
+		effector = {
+			action = on_digiline_receive
+		},
+	},
+
+	light_source = 6,
+})
+
+minetest.register_entity("digilines_lcd:text", {
+	collisionbox = { 0, 0, 0, 0, 0, 0 },
+	visual = "upright_sprite",
+	textures = {},
+
+	on_activate = function(self)
+		local meta = minetest.env:get_meta(self.object:getpos())
+		local text = meta:get_string("text")
+		self.object:set_properties({textures={generate_texture(create_lines(text))}})
+	end
+})
+
+-- CONSTANTS
+local LCD_WITH = 100
+local LCD_PADDING = 8
+
+local LINE_LENGTH = 12
+local NUMBER_OF_LINES = 5
+
+local LINE_HEIGHT = 14
+local CHAR_WIDTH = 5
+
+string_to_array = function(str)
+	local tab = {}
+	for i=1,string.len(str) do
+		table.insert(tab, string.sub(str, i,i))
+	end
+	return tab
+end
+
+string_to_word_array = function(str)
+	local tab = {}
+	local current = 1
+	tab[1] = ""
+	for _,char in ipairs(string_to_array(str)) do
+		if char ~= " " then
+			tab[current] = tab[current]..char
+		else
+			current = current+1
+			tab[current] = ""
+		end
+	end
+	return tab
+end
+
+create_lines = function(text)
+	local line = ""
+	local line_num = 1
+	local tab = {}
+	for _,word in ipairs(string_to_word_array(text)) do
+		if string.len(line)+string.len(word) < LINE_LENGTH and word ~= "|" then
+			if line ~= "" then
+				line = line.." "..word
+			else
+				line = word
+			end
+		else
+			table.insert(tab, line)
+			if word ~= "|" then
+				line = word
+			else
+				line = ""
+			end
+			line_num = line_num+1
+			if line_num > NUMBER_OF_LINES then
+				return tab
+			end
+		end
+	end
+	table.insert(tab, line)
+	return tab
+end
+
+generate_texture = function(lines)
+	local texture = "[combine:"..LCD_WITH.."x"..LCD_WITH
+	local ypos = 16
+	for i = 1, #lines do
+		texture = texture..generate_line(lines[i], ypos)
+		ypos = ypos + LINE_HEIGHT
+	end
+	return texture
+end
+
+generate_line = function(s, ypos)
+	local i = 1
+	local parsed = {}
+	local width = 0
+	local chars = 0
+	while chars < max_chars and i <= #s do
+		local file = nil
+		if charmap[s:sub(i, i)] ~= nil then
+			file = charmap[s:sub(i, i)]
+			i = i + 1
+		elseif i < #s and charmap[s:sub(i, i + 1)] ~= nil then
+			file = charmap[s:sub(i, i + 1)]
+			i = i + 2
+		else
+			print("[digilines_lcd] W: unknown symbol in '"..s.."' at "..i)
+			i = i + 1
+		end
+		if file ~= nil then
+			width = width + CHAR_WIDTH
+			table.insert(parsed, file)
+			chars = chars + 1
+		end
+	end
+	width = width - 1
+
+	local texture = ""
+	local xpos = math.floor((LCD_WITH - 2 * LCD_PADDING - width) / 2 + LCD_PADDING)
+	for i = 1, #parsed do
+		texture = texture..":"..xpos..","..ypos.."="..parsed[i]..".png"
+		xpos = xpos + CHAR_WIDTH + 1
+	end
+	return texture
+end