homedecor_modpack/signs_lib.lua

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local S = homedecor.gettext
-- CONSTANTS
local MP = minetest.get_modpath("homedecor")
-- Used by `build_char_db' to locate the file.
local FONT_FMT = "%s/hdf_%02x.png"
-- Simple texture name for building text texture.
local FONT_FMT_SIMPLE = "hdf_%02x.png"
-- Path to the textures.
local TP = MP.."/textures"
local TEXT_SCALE = {x=0.9, y=0.5}
-- Lots of overkill here. KISS advocates, go away, shoo! ;) -- kaeza
local PNG_HDR = string.char(0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A)
-- Read the image size from a PNG file.
-- Returns image_w, image_h.
-- Only the LSB is read from each field!
local function read_png_size(f)
f:seek("set", 0x0)
local hdr = f:read(8)
if hdr ~= PNG_HDR then return end
f:seek("set", 0x13)
local ws = f:read(1)
f:seek("set", 0x17)
local hs = f:read(1)
return ws:byte(), hs:byte()
end
-- Set by build_char_db()
local LINE_HEIGHT
local SIGN_WIDTH
local SIGN_PADDING
-- Size of the canvas, in characters.
-- Please note that CHARS_PER_LINE is multiplied by the average character
-- width to get the total width of the canvas, so for proportional fonts,
-- either more or fewer characters may fit on a line.
local CHARS_PER_LINE = 30
local NUMBER_OF_LINES = 6
-- Separation between lines. 1.0 means no separation (ypos offset by text
-- height), 2.0 is one "line" (ypos offset by two times text height), etc.
local LINE_SEP = 1.2
-- This holds the individual character widths.
-- Indexed by the actual character (e.g. charwidth["A"])
local charwidth = { }
-- File to cache the font size to.
local CHARDB_FILE = minetest.get_worldpath().."/homedecor_chardb"
local function check_random_chars()
for i = 1, 5 do
local c = math.random(32, 126)
local filename = FONT_FMT:format(TP, c)
local f = io.open(filename)
-- File does not exist (or cannot be read, or ...).
-- Just assume it's different.
if not f then return true end
local w, h = read_png_size(f)
f:close()
-- File is not a PNG... wut?
-- Just assume it's different.
if not (w and h) then return true end
local ch = string.char(c)
if (not charwidth[ch]) -- Char is not cached.
or (charwidth[ch] ~= w) -- Width differs.
or (LINE_HEIGHT and (LINE_HEIGHT ~= h)) -- Height differs
then
-- In any case, file is different; rebuild cache.
return true
end
end
-- OK, our superficial check passed. If the textures are messed up,
-- it's not our problem.
return false
end
local function build_char_db()
LINE_HEIGHT = nil
SIGN_WIDTH = nil
SIGN_PADDING = nil
-- To calculate average char width.
local total_width = 0
local char_count = 0
-- Try to load cached data to avoid heavy disk I/O.
local cdbf = io.open(CHARDB_FILE, "rt")
if cdbf then
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minetest.log("info", "[homedecor] "..S("Reading cached character database."))
for line in cdbf:lines() do
local ch, w = line:match("(0x[0-9A-Fa-f]+)%s+([0-9][0-9]*)")
if ch and w then
local c = tonumber(ch)
w = tonumber(w)
if c and w then
if c == 0 then
LINE_HEIGHT = w
elseif (c >= 32) and (c < 127) then
charwidth[string.char(c)] = w
total_width = total_width + w
char_count = char_count + 1
end
end
end
end
cdbf:close()
if LINE_HEIGHT then
-- Check some random characters to see if the file on disk differs
-- from the cached one. If so, then ditch cached data and rebuild
-- (font probably was changed).
if not check_random_chars() then
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LINE_HEIGHT = nil
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minetest.log("info", "[homedecor] "
..S("Font seems to have changed. Rebuilding cache.")
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)
end
else
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minetest.log("warning", "[homedecor] "
..S("Could not find font line height in cached DB. Trying brute force.")
)
end
end
if not LINE_HEIGHT then
-- OK, something went wrong... try brute force loading from texture files.
charwidth = { }
total_width = 0
char_count = 0
for c = 32, 126 do
local filename = FONT_FMT:format(TP, c)
local f = io.open(filename)
if f then
local ch = string.char(c)
local w, h = read_png_size(f)
f:close()
if w and h then
charwidth[ch] = w
total_width = total_width + w
char_count = char_count + 1
if not LINE_HEIGHT then LINE_HEIGHT = h end
end
end
end
if not LINE_HEIGHT then
error("Could not find font line height.")
end
end
-- XXX: Is there a better way to calc this?
-- XXX: Remember to change similar lines below if this changes.
SIGN_WIDTH = math.floor((total_width / char_count) * CHARS_PER_LINE)
SIGN_PADDING = SIGN_WIDTH / 16 -- Totally arbitrary.
-- Try to save cached list back to disk.
local e -- Note: `cdbf' is already declared local above.
cdbf, e = io.open(CHARDB_FILE, "wt")
if not cdbf then
minetest.log("warning", "[homedecor] Could not save cached char DB: "..(e or ""))
return
end
cdbf:write(("0x00 %d\n"):format(LINE_HEIGHT))
for c = 32, 126 do
local w = charwidth[string.char(c)]
if w then
cdbf:write(("0x%02X %d\n"):format(c, w))
end
end
cdbf:close()
end
local signs = {
{delta = {x = 0, y = 0.15, z = 0.399}, yaw = 0},
{delta = {x = 0.399, y = 0.15, z = 0 }, yaw = math.pi / -2},
{delta = {x = 0, y = 0.15, z = -0.399}, yaw = math.pi},
{delta = {x = -0.399, y = 0.15, z = 0 }, yaw = math.pi / 2},
}
local signs_yard = {
{delta = {x = 0, y = 0.15, z = -0.05}, yaw = 0},
{delta = {x = -0.05, y = 0.15, z = 0 }, yaw = math.pi / -2},
{delta = {x = 0, y = 0.15, z = 0.05}, yaw = math.pi},
{delta = {x = 0.05, y = 0.15, z = 0 }, yaw = math.pi / 2},
}
local signs_post = {
{delta = {x = 0, y = 0.15, z = -0.226}, yaw = 0},
{delta = {x = -0.226, y = 0.15, z = 0 }, yaw = math.pi / -2},
{delta = {x = 0, y = 0.15, z = 0.226 }, yaw = math.pi},
{delta = {x = 0.226, y = 0.15, z = 0 }, yaw = math.pi / 2},
}
local sign_groups = {choppy=2, dig_immediate=2}
local fences_with_sign = { }
-- some local helper functions
local homedecor_create_lines = function(text)
local tab = {}
for line in text:gmatch("([^|]+)|?") do
line = line:gsub("^%s*(.*)%s*$", "%1") -- Trim whitespace
table.insert(tab, line)
if #tab >= NUMBER_OF_LINES then break end
end
return tab
end
local math_max = math.max
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local homedecor_generate_line = function(s, lineno)
local width = 0
local maxw = 0
local chars = { }
local max_line_w = SIGN_WIDTH - (SIGN_PADDING * 2)
-- We check which chars are available here.
for i = 1, #s do
local c = s:sub(i, i)
local w = charwidth[c]
if w then
width = width + w + 1
maxw = math_max(width, maxw)
if width >= max_line_w then
width = 0
end
table.insert(chars, c)
end
end
maxw = maxw - 1
-- Okay, we actually build the "line texture" here.
local start_xpos = math.floor((SIGN_WIDTH - 2 * SIGN_PADDING - maxw) / 2 + SIGN_PADDING)
local xpos = start_xpos
local texture = { }
local ypos = (LINE_HEIGHT * (lineno --[[+ 1]]))
width = 0
for i = 1, #s do
local c = s:sub(i, i)
local w = charwidth[c]
local tex = FONT_FMT_SIMPLE:format(c:byte())
table.insert(texture, (":%d,%d=%s"):format(xpos, ypos, tex))
xpos = xpos + w + 1
width = width + w + 1
if width > max_line_w then
xpos = start_xpos
ypos = ypos + (LINE_HEIGHT * LINE_SEP)
width = 0
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lineno = lineno + 1
end
if lineno >= NUMBER_OF_LINES then break end
end
return table.concat(texture, ""), lineno
end
local function copy ( t )
local nt = { };
for k, v in pairs(t) do
if type(v) == "table" then
nt[k] = copy(v)
else
nt[k] = v
end
end
return nt
end
local homedecor_generate_texture = function(lines)
local texture = { ("[combine:%dx%d"):format(SIGN_WIDTH, LINE_HEIGHT * NUMBER_OF_LINES * LINE_SEP) }
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local lineno = 0
for i = 1, #lines do
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if lineno >= NUMBER_OF_LINES then break end
local linetex, ln = homedecor_generate_line(lines[i], lineno)
table.insert(texture, linetex)
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lineno = ln + 1
end
return table.concat(texture, "")
end
local function set_obj_text(obj, text)
obj:set_properties({
textures={homedecor_generate_texture(homedecor_create_lines(text))},
visual_size = TEXT_SCALE,
})
end
homedecor.construct_sign = function(pos)
local meta = minetest.get_meta(pos)
meta:set_string("formspec", "field[text;;${text}]")
meta:set_string("infotext", "")
end
homedecor.destruct_sign = function(pos)
local objects = minetest.get_objects_inside_radius(pos, 0.5)
for _, v in ipairs(objects) do
if v:get_entity_name() == "signs:text" then
v:remove()
end
end
end
homedecor.update_sign = function(pos, fields)
local meta = minetest.get_meta(pos)
if fields then
meta:set_string("infotext", table.concat(homedecor_create_lines(fields.text), "\n"))
meta:set_string("text", fields.text)
end
local text = meta:get_string("text")
local objects = minetest.get_objects_inside_radius(pos, 0.5)
for _, v in ipairs(objects) do
if v:get_entity_name() == "signs:text" then
set_obj_text(v, text)
return
end
end
-- if there is no entity
local sign_info
if minetest.get_node(pos).name == "signs:sign_yard" then
sign_info = signs_yard[minetest.get_node(pos).param2 + 1]
elseif minetest.get_node(pos).name == "default:sign_wall" then
sign_info = signs[minetest.get_node(pos).param2 + 1]
else --if minetest.get_node(pos).name == "signs:sign_post" then
sign_info = signs_post[minetest.get_node(pos).param2 + 1]
end
if sign_info == nil then
return
end
local text = minetest.add_entity({x = pos.x + sign_info.delta.x,
y = pos.y + sign_info.delta.y,
z = pos.z + sign_info.delta.z}, "signs:text")
text:setyaw(sign_info.yaw)
end
if not homedecor.disable_signs then
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minetest.register_node(":default:sign_wall", {
description = "Sign",
inventory_image = "default_sign_wall.png",
wield_image = "default_sign_wall.png",
node_placement_prediction = "",
paramtype = "light",
sunlight_propagates = true,
paramtype2 = "facedir",
drawtype = "nodebox",
node_box = {type = "fixed", fixed = {-0.45, -0.15, 0.4, 0.45, 0.45, 0.498}},
selection_box = {type = "fixed", fixed = {-0.45, -0.15, 0.4, 0.45, 0.45, 0.498}},
tiles = {"signs_top.png", "signs_bottom.png", "signs_side.png", "signs_side.png", "signs_back.png", "signs_front.png"},
groups = sign_groups,
on_place = function(itemstack, placer, pointed_thing)
local name
name = minetest.get_node(pointed_thing.under).name
if fences_with_sign[name] then
if homedecor:node_is_owned(pointed_thing.under, placer) then
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return itemstack
end
else
name = minetest.get_node(pointed_thing.above).name
local def = minetest.registered_nodes[name]
if homedecor:node_is_owned(pointed_thing.above, placer)
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or (not def.buildable_to) then
return itemstack
end
end
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local node=minetest.get_node(pointed_thing.under)
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if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].on_rightclick then
return minetest.registered_nodes[node.name].on_rightclick(pointed_thing.under, node, placer)
else
local above = pointed_thing.above
local under = pointed_thing.under
local dir = {x = under.x - above.x,
y = under.y - above.y,
z = under.z - above.z}
local wdir = minetest.dir_to_wallmounted(dir)
local placer_pos = placer:getpos()
if placer_pos then
dir = {
x = above.x - placer_pos.x,
y = above.y - placer_pos.y,
z = above.z - placer_pos.z
}
end
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local fdir = minetest.dir_to_facedir(dir)
local sign_info
local pt_name = minetest.get_node(under).name
print(dump(pt_name))
if fences_with_sign[pt_name] then
minetest.add_node(under, {name = fences_with_sign[pt_name], param2 = fdir})
sign_info = signs_post[fdir + 1]
elseif wdir == 0 then
--how would you add sign to ceiling?
minetest.add_item(above, "default:sign_wall")
itemstack:take_item()
return itemstack
elseif wdir == 1 then
minetest.add_node(above, {name = "signs:sign_yard", param2 = fdir})
sign_info = signs_yard[fdir + 1]
else
minetest.add_node(above, {name = "default:sign_wall", param2 = fdir})
sign_info = signs[fdir + 1]
end
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local text = minetest.add_entity({x = above.x + sign_info.delta.x,
y = above.y + sign_info.delta.y,
z = above.z + sign_info.delta.z}, "signs:text")
text:setyaw(sign_info.yaw)
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if not homedecor.expect_infinite_stacks then
itemstack:take_item()
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end
return itemstack
end
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end,
on_construct = function(pos)
homedecor.construct_sign(pos)
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end,
on_destruct = function(pos)
homedecor.destruct_sign(pos)
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end,
on_receive_fields = function(pos, formname, fields, sender)
if fields then
print(S("%s wrote \"%s\" to sign at %s"):format(
(sender:get_player_name() or ""),
fields.text,
minetest.pos_to_string(pos)
))
end
if homedecor:node_is_owned(pos, sender) then return end
homedecor.update_sign(pos, fields)
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end,
on_punch = function(pos, node, puncher)
homedecor.update_sign(pos)
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end,
})
end
minetest.register_node(":signs:sign_yard", {
paramtype = "light",
sunlight_propagates = true,
paramtype2 = "facedir",
drawtype = "nodebox",
node_box = {type = "fixed", fixed = {
{-0.45, -0.15, -0.049, 0.45, 0.45, 0.049},
{-0.05, -0.5, -0.049, 0.05, -0.15, 0.049}
}},
selection_box = {type = "fixed", fixed = {-0.45, -0.15, -0.049, 0.45, 0.45, 0.049}},
tiles = {"signs_top.png", "signs_bottom.png", "signs_side.png", "signs_side.png", "signs_back.png", "signs_front.png"},
groups = {choppy=2, dig_immediate=2},
drop = "default:sign_wall",
on_construct = function(pos)
homedecor.construct_sign(pos)
end,
on_destruct = function(pos)
homedecor.destruct_sign(pos)
end,
on_receive_fields = function(pos, formname, fields, sender)
if fields then
print(S("%s wrote \"%s\" to sign at %s"):format(
(sender:get_player_name() or ""),
fields.text,
minetest.pos_to_string(pos)
))
end
if homedecor:node_is_owned(pos, sender) then return end
homedecor.update_sign(pos, fields)
end,
on_punch = function(pos, node, puncher)
homedecor.update_sign(pos)
end,
})
minetest.register_node(":signs:sign_post", {
paramtype = "light",
sunlight_propagates = true,
paramtype2 = "facedir",
drawtype = "nodebox",
node_box = {
type = "fixed",
fixed = {
{ -0.125, -0.5, -0.125, 0.125, 0.5, 0.125 },
{ -0.45, -0.15, -0.225, 0.45, 0.45, -0.125 },
}
},
selection_box = {
type = "fixed",
fixed = {
{ -0.125, -0.5, -0.125, 0.125, 0.5, 0.125 },
{ -0.45, -0.15, -0.225, 0.45, 0.45, -0.125 },
}
},
tiles = {
"signs_post_top.png",
"signs_post_bottom.png",
"signs_post_side.png",
"signs_post_side.png",
"signs_post_back.png",
"signs_post_front.png",
},
groups = {choppy=2, dig_immediate=2},
drop = {
max_items = 2,
items = {
{ items = { "default:sign_wall" }},
{ items = { "default:fence_wood" }},
},
},
})
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local signs_text_on_activate
if not homedecor.disable_signs then
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signs_text_on_activate = function(self)
local meta = minetest.get_meta(self.object:getpos())
local text = meta:get_string("text")
set_obj_text(self.object, text)
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end
else
signs_text_on_activate = function(self)
self.object:remove()
end
end
minetest.register_entity(":signs:text", {
collisionbox = { 0, 0, 0, 0, 0, 0 },
visual = "upright_sprite",
textures = {},
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on_activate = signs_text_on_activate,
})
-- And the good stuff here! :-)
function homedecor.register_fence_with_sign(fencename, fencewithsignname)
local def = minetest.registered_nodes[fencename]
local def_sign = minetest.registered_nodes[fencewithsignname]
if not (def and def_sign) then
minetest.log("warning", "[homedecor] Attempt to register unknown node as fence")
return
end
def = copy(def)
def_sign = copy(def_sign)
fences_with_sign[fencename] = fencewithsignname
def.on_place = function(itemstack, placer, pointed_thing, ...)
local node_above = minetest.get_node(pointed_thing.above)
local node_under = minetest.get_node(pointed_thing.under)
local def_above = minetest.registered_nodes[node_above.name]
local def_under = minetest.registered_nodes[node_under.name]
local fdir = minetest.dir_to_facedir(placer:get_look_dir())
if def_under and def_under.on_rightclick then
return def_under.on_rightclick(pointed_thing.under, node_under, placer, itemstack) or itemstack
elseif (not homedecor:node_is_owned(pointed_thing.under, placer))
and def_under.buildable_to then
minetest.add_node(pointed_thing.under, {name = fencename, param2 = fdir})
if not homedecor.expect_infinite_stacks then
itemstack:take_item()
end
placer:set_wielded_item(itemstack)
return itemstack
elseif (not homedecor:node_is_owned(pointed_thing.above, placer))
and def_above.buildable_to then
minetest.add_node(pointed_thing.above, {name = fencename, param2 = fdir})
if not homedecor.expect_infinite_stacks then
itemstack:take_item()
end
placer:set_wielded_item(itemstack)
return itemstack
end
end
def_sign.on_construct = function(pos, ...)
homedecor.construct_sign(pos)
end
def_sign.on_destruct = function(pos, ...)
homedecor.destruct_sign(pos)
end
def_sign.on_receive_fields = function(pos, formname, fields, sender, ...)
if fields then
print(S("%s wrote \"%s\" to sign at %s"):format(
(sender:get_player_name() or ""),
fields.text,
minetest.pos_to_string(pos)
))
end
if homedecor:node_is_owned(pos, sender) then return end
homedecor.update_sign(pos, fields)
end
def_sign.on_punch = function(pos, node, puncher, ...)
homedecor.update_sign(pos)
end
local fencename = fencename
def_sign.after_dig_node = function(pos, node, ...)
node.name = fencename
minetest.add_node(pos, node)
end
def_sign.drop = "default:sign_wall"
minetest.register_node(":"..fencename, def)
minetest.register_node(":"..fencewithsignname, def_sign)
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print(S("Registered %s and %s"):format(fencename, fencewithsignname))
end
build_char_db()
if minetest.setting_get("log_mods") then
minetest.log("action", S("signs loaded"))
end