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local font = {}
signs.font_height = 10
-- Get png width, suposing png width is less than 256 (it is the case for all font textures)
local function get_png_width(filename)
local file=assert(io.open(filename,"rb"))
-- All font png are smaller than 256x256 --> read only last byte
file:seek("set",19)
local w = file:read(1)
file:close()
return w:byte()
end
-- Computes line width for a given font height and text
function signs.get_line_width(text)
local char
local width = 0
for p=1,#text
do
char = text:sub(p,p):byte()
if font[char] then
width = width + font[char].width
end
end
return width
end
--- Builds texture part for a text line
-- @param text Text to be rendered
-- @param x Starting x position in texture
-- @param width Width of the texture (extra text is not rendered)
-- @param y Vertical position of the line in texture
-- @return Texture string
function signs.make_line_texture(text, x, width, y)
local char
local texture = ""
for p=1,#text
do
char = text:sub(p,p):byte()
if font[char] then
-- Add image only if it is visible (at least partly)
if x + font[char].width >= 0 and x <= width then
texture = texture..string.format(":%d,%d=%s", x, y, font[char].filename)
end
x = x + font[char].width
end
end
return texture
end
local function split_lines(text, maxlines)
local splits = text:split("\n")
if maxlines then
local lines = {}
for num = 1,maxlines do
lines[num] = splits[num]
end
return lines
else
return splits
end
end
function signs.on_display_update(pos, objref)
local meta = minetest.get_meta(pos)
local text = meta:get_string("display_text")
local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
if ndef and ndef.sign_model then
local model = signs.sign_models[ndef.sign_model]
local lines = split_lines(text, model.maxlines)
local texturew = model.width/model.xscale
local textureh = model.height/model.yscale
local texture = ""
local y
if model.valing == "top" then
y = signs.font_height / 2
else
y = (textureh - signs.font_height * #lines) / 2 + 1
end
for _, line in pairs(lines) do
texture = texture..signs.make_line_texture(line,
(texturew - signs.get_line_width(line)) / 2,
texturew, y)
y = y + signs.font_height
end
local texture = string.format("[combine:%dx%d", texturew, textureh)..texture
if model.color then texture = texture.."^[colorize:"..model.color end
objref:set_properties({ textures={texture}, visual_size = {x=model.width, y=model.height}})
end
end
function signs.set_formspec(pos)
local meta = minetest.get_meta(pos)
local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
if ndef and ndef.sign_model then
local model = signs.sign_models[ndef.sign_model]
local formspec
if model.maxlines == 1 then
formspec = "size[6,3]"..
"field[0.5,0.7;5.5,1;display_text;Displayed text;${display_text}]"..
"button_exit[2,2;2,1;ok;Write]"
else
local extralabel = ""
if model.maxlines then
extralabel = " (first "..model.maxlines.." lines only)"
end
formspec = "size[6,4]"..
"textarea[0.5,0.7;5.5,2;display_text;Displayed text"..extralabel..";${display_text}]"..
"button_exit[2,3;2,1;ok;Write]"
end
meta:set_string("formspec", formspec)
end
end
function signs.on_receive_fields(pos, formname, fields, player)
if not minetest.is_protected(pos, player:get_player_name()) then
local meta = minetest.get_meta(pos)
if fields and fields.ok then
meta:set_string("display_text", fields.display_text)
meta:set_string("infotext", "\""..fields.display_text.."\"")
display_lib.update_entities(pos)
end
end
end
-- On place callback for direction signs
-- (chooses which sign according to look direction)
function signs.on_place_direction(itemstack, placer, pointed_thing)
local above = pointed_thing.above
local under = pointed_thing.under
local wdir = minetest.dir_to_wallmounted(
{x = under.x - above.x,
y = under.y - above.y,
z = under.z - above.z})
local dir = placer:get_look_dir()
if wdir == 0 or wdir == 1 then
wdir = minetest.dir_to_wallmounted({x=dir.x, y=0, z=dir.z})
end
local name = itemstack:get_name()
-- Only for direction signs (ending with _right)
if name:sub(-string.len("_right")) == "_right" then
name = name:sub(1, -string.len("_right"))
local test = {0, dir.z, -dir.z, -dir.x, dir.x}
if test[wdir] > 0 then
itemstack:set_name(name.."left")
end
itemstack = minetest.item_place(itemstack, placer, pointed_thing, wdir)
itemstack:set_name(name.."right")
return itemstack
else
return minetest.item_place(itemstack, placer, pointed_thing, wdir)
end
end
-- On_rotate (screwdriver) callback for direction signs
function signs.on_rotate_direction(pos, node, user, mode, new_param2)
if mode == screwdriver.ROTATE_AXIS then
local name
if node.name:sub(-string.len("_right")) == "_right" then
name = node.name:sub(1, -string.len("_right")).."left"
end
if node.name:sub(-string.len("_left")) == "_left" then
name = node.name:sub(1, -string.len("_left")).."right"
end
if name then
minetest.swap_node(pos, {name = name, param1 = node.param1, param2 = node.param2})
end
return false
else
return display_lib.on_rotate(pos, node, user, mode, new_param2)
end
end
-- Populate fonts table
local w, filename
for charnum=32,126 do
filename = string.format("signs_%02x.png", charnum)
w = get_png_width(signs.path.."/textures/"..filename)
font[charnum] = {filename=filename, width=w}
end
-- Generic callback for show_formspec displayed formspecs
minetest.register_on_player_receive_fields(function(player, formname, fields)
local found, _, mod, node_name, pos = formname:find("([%w_]+):([%w_]+)@(.+)")
if found then
if mod ~= 'signs' then return end
local ndef = minetest.registered_nodes[mod..":"..node_name]
if ndef and ndef.on_receive_fields then
ndef.on_receive_fields(minetest.string_to_pos(pos), formname, fields, player)
end
end
end)
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