homedecor_modpack/signs_lib.lua

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-- This code was borrowed from Pilzadam's rework of thexyz's signs mod
-- Font: 04.jp.org
-- load characters map
local chars_file = io.open(minetest.get_modpath("homedecor").."/characters", "r")
local charmap = {}
local max_chars = 16
if not chars_file then
print("[homedecor] 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 signs_post = {
{delta = {x = 0, y = 0, z = -0.226}, yaw = 0},
{delta = {x = -0.226, y = 0, z = 0}, yaw = math.pi / -2},
{delta = {x = 0, y = 0, z = 0.226}, yaw = math.pi},
{delta = {x = 0.226, y = 0, z = 0}, yaw = math.pi / 2},
}
homedecor_construct_sign = function(pos)
local meta = minetest.env:get_meta(pos)
meta:set_string("formspec", "field[text;;${text}]")
meta:set_string("infotext", "")
end
homedecor_destruct_sign = function(pos)
local objects = minetest.env:get_objects_inside_radius(pos, 0.5)
for _, v in ipairs(objects) do
if v:get_entity_name() == "homedecor:sign_text" then
v:remove()
end
end
end
homedecor_update_sign = function(pos, fields)
local meta = minetest.env:get_meta(pos)
meta:set_string("infotext", "")
if fields then
meta:set_string("text", fields.text)
end
local text = meta:get_string("text")
local objects = minetest.env:get_objects_inside_radius(pos, 0.5)
for _, v in ipairs(objects) do
if v:get_entity_name() == "homedecor:sign_text" then
v:set_properties({textures={homedecor_generate_texture(homedecor_create_lines(text))}})
return
end
end
-- if there is no entity
local sign_info
if minetest.env:get_node(pos).name == "homedecor:fence_brass_with_sign"
or minetest.env:get_node(pos).name == "homedecor:fence_wrought_iron_with_sign" then
sign_info = signs_post[minetest.env:get_node(pos).param2 + 1]
end
if sign_info == nil then
return
end
local text = minetest.env:add_entity({x = pos.x + sign_info.delta.x,
y = pos.y + sign_info.delta.y,
z = pos.z + sign_info.delta.z}, "homedecor:sign_text")
text:setyaw(sign_info.yaw)
end
minetest.register_entity("homedecor:sign_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={homedecor_generate_texture(homedecor_create_lines(text))}})
end
})
-- CONSTANTS
local SIGN_WITH = 110
local SIGN_PADDING = 8
local LINE_LENGTH = 16
local NUMBER_OF_LINES = 4
local LINE_HEIGHT = 14
local CHAR_WIDTH = 5
homedecor_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
homedecor_string_to_word_array = function(str)
local tab = {}
local current = 1
tab[1] = ""
for _,char in ipairs(homedecor_string_to_array(str)) do
if char ~= " " then
tab[current] = tab[current]..char
else
current = current+1
tab[current] = ""
end
end
return tab
end
homedecor_create_lines = function(text)
local line = ""
local line_num = 1
local tab = {}
for _,word in ipairs(homedecor_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
homedecor_generate_texture = function(lines)
local texture = "[combine:"..SIGN_WITH.."x"..SIGN_WITH
local ypos = 12
for i = 1, #lines do
texture = texture..homedecor_generate_line(lines[i], ypos)
ypos = ypos + LINE_HEIGHT
end
return texture
end
homedecor_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("[homedecor] W: unknown symbol in '"..s.."' at "..i.." (probably "..s:sub(i, 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((SIGN_WITH - 2 * SIGN_PADDING - width) / 2 + SIGN_PADDING)
for i = 1, #parsed do
texture = texture..":"..xpos..","..ypos.."="..parsed[i]..".png"
xpos = xpos + CHAR_WIDTH + 1
end
return texture
end