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----------------------
-- Vector functions --
----------------------
function vector.cross(a, b)
return {
x = a.y * b.z - a.z * b.y,
y = a.z * b.x - a.x * b.z,
z = a.x * b.y - a.y * b.x
}
end
function vector.dot(a, b)
return a.x * b.x + a.y * b.y + a.z * b.z
end
-----------------------
-- Facedir functions --
-----------------------
function minetest.facedir_to_top_dir(facedir)
return ({[0] = {x = 0, y = 1, z = 0},
{x = 0, y = 0, z = 1},
{x = 0, y = 0, z = -1},
{x = 1, y = 0, z = 0},
{x = -1, y = 0, z = 0},
{x = 0, y = -1, z = 0}})
[math.floor(facedir / 4)]
end
function minetest.facedir_to_right_dir(facedir)
return vector.cross(
minetest.facedir_to_top_dir(facedir),
minetest.facedir_to_dir(facedir)
)
end
directions = {}
function directions.side_to_dir(side)
return ({[0] = vector.new(),
vector.new( 0, 1, 0),
vector.new( 0, -1, 0),
vector.new( 1, 0, 0),
vector.new(-1, 0, 0),
vector.new( 0, 0, 1),
vector.new( 0, 0, -1)
})[side]
end
function directions.dir_to_side(dir)
local c = vector.dot(dir, vector.new(1, 2, 3)) + 4
return ({6, 2, 4, 0, 3, 1, 5})[c]
end
----------------------
-- String functions --
----------------------
--[[function string.split(str, sep)
local fields = {}
local index = 1
local expr = "([^"..sep.."])+"
string.gsub(str, expr, function(substring)
fields[index] = substring
index = index + 1
end)
return fields
end]]
function string.startswith(str, substr)
return str:sub(1, substr:len()) == substr
end
---------------------
-- Table functions --
---------------------
function table.contains(tbl, element)
for _, elt in pairs(tbl) do
if elt == element then
return true
end
end
return false
end
function table.extend(tbl, tbl2)
local index = #tbl + 1
for _, elt in ipairs(tbl2) do
tbl[index] = elt
index = index + 1
end
end
function table.recursive_replace(tbl, pattern, replace_with)
if type(tbl) == "table" then
local tbl2 = {}
for key, value in pairs(tbl) do
tbl2[key] = table.recursive_replace(value, pattern, replace_with)
end
return tbl2
elseif type(tbl) == "string" then
return tbl:gsub(pattern, replace_with)
else
return tbl
end
end
------------------------
-- Formspec functions --
------------------------
fs_helpers = {}
function fs_helpers.on_receive_fields(pos, fields)
local meta = minetest.get_meta(pos)
for field, value in pairs(fields) do
if field:startswith("fs_helpers_cycling:") then
local l = field:split(":")
local new_value = tonumber(l[2])
local meta_name = l[3]
meta:set_int(meta_name, new_value)
end
end
end
function fs_helpers.cycling_button(meta, base, meta_name, values)
local current_value = meta:get_int(meta_name)
local new_value = (current_value + 1) % (#values)
local text = values[current_value + 1]
local field = "fs_helpers_cycling:"..new_value..":"..meta_name
return base..";"..field..";"..text.."]"
end
---------
-- Env --
---------
function minetest.load_position(pos)
if minetest.get_node_or_nil(pos) then
return
end
local vm = minetest.get_voxel_manip()
vm:read_from_map(pos, pos)
end
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