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-- Minetest: builtin/item.lua
--
-- Falling stuff
--
core.register_entity(":__builtin:falling_node", {
initial_properties = {
visual = "wielditem",
visual_size = {x = 0.667, y = 0.667},
textures = {},
physical = true,
is_visible = false,
collide_with_objects = false,
collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
},
node = {},
set_node = function(self, node)
self.node = node
self.object:set_properties({
is_visible = true,
textures = {node.name},
})
end,
get_staticdata = function(self)
return core.serialize(self.node)
end,
on_activate = function(self, staticdata)
self.object:set_armor_groups({immortal = 1})
local node = core.deserialize(staticdata)
if node then
self:set_node(node)
elseif staticdata ~= "" then
self:set_node({name = staticdata})
end
end,
on_step = function(self, dtime)
-- Set gravity
local acceleration = self.object:getacceleration()
if not vector.equals(acceleration, {x = 0, y = -10, z = 0}) then
self.object:setacceleration({x = 0, y = -10, z = 0})
end
-- Turn to actual sand when collides to ground or just move
local pos = self.object:getpos()
local bcp = {x = pos.x, y = pos.y - 0.7, z = pos.z} -- Position of bottom center point
local bcn = core.get_node(bcp)
local bcd = core.registered_nodes[bcn.name]
-- Note: walkable is in the node definition, not in item groups
if not bcd or
(bcd.walkable or
(core.get_item_group(self.node.name, "float") ~= 0 and
bcd.liquidtype ~= "none")) then
if bcd and bcd.leveled and
bcn.name == self.node.name then
local addlevel = self.node.level
if not addlevel or addlevel <= 0 then
addlevel = bcd.leveled
end
if core.add_node_level(bcp, addlevel) == 0 then
self.object:remove()
return
end
elseif bcd and bcd.buildable_to and
(core.get_item_group(self.node.name, "float") == 0 or
bcd.liquidtype == "none") then
core.remove_node(bcp)
return
end
local np = {x = bcp.x, y = bcp.y + 1, z = bcp.z}
-- Check what's here
local n2 = core.get_node(np)
-- If it's not air or liquid, remove node and replace it with
-- it's drops
if n2.name ~= "air" and (not core.registered_nodes[n2.name] or
core.registered_nodes[n2.name].liquidtype == "none") then
core.remove_node(np)
if core.registered_nodes[n2.name].buildable_to == false then
-- Add dropped items
local drops = core.get_node_drops(n2.name, "")
for _, dropped_item in ipairs(drops) do
core.add_item(np, dropped_item)
end
end
-- Run script hook
for _, callback in ipairs(core.registered_on_dignodes) do
callback(np, n2)
end
end
-- Create node and remove entity
core.add_node(np, self.node)
self.object:remove()
nodeupdate(np)
return
end
local vel = self.object:getvelocity()
if vector.equals(vel, {x = 0, y = 0, z = 0}) then
local npos = self.object:getpos()
self.object:setpos(vector.round(npos))
end
end
})
function spawn_falling_node(p, node)
local obj = core.add_entity(p, "__builtin:falling_node")
obj:get_luaentity():set_node(node)
end
function drop_attached_node(p)
local nn = core.get_node(p).name
core.remove_node(p)
for _, item in ipairs(core.get_node_drops(nn, "")) do
local pos = {
x = p.x + math.random()/2 - 0.25,
y = p.y + math.random()/2 - 0.25,
z = p.z + math.random()/2 - 0.25,
}
core.add_item(pos, item)
end
end
function check_attached_node(p, n)
local def = core.registered_nodes[n.name]
local d = {x = 0, y = 0, z = 0}
if def.paramtype2 == "wallmounted" then
d = core.wallmounted_to_dir(n.param2)
else
d.y = -1
end
local p2 = vector.add(p, d)
local nn = core.get_node(p2).name
local def2 = core.registered_nodes[nn]
if def2 and not def2.walkable then
return false
end
return true
end
--
-- Some common functions
--
function nodeupdate_single(p, delay)
local n = core.get_node(p)
if core.get_item_group(n.name, "falling_node") ~= 0 then
local p_bottom = {x = p.x, y = p.y - 1, z = p.z}
local n_bottom = core.get_node(p_bottom)
-- Note: walkable is in the node definition, not in item groups
if core.registered_nodes[n_bottom.name] and
(core.get_item_group(n.name, "float") == 0 or
core.registered_nodes[n_bottom.name].liquidtype == "none") and
(n.name ~= n_bottom.name or (core.registered_nodes[n_bottom.name].leveled and
core.get_node_level(p_bottom) < core.get_node_max_level(p_bottom))) and
(not core.registered_nodes[n_bottom.name].walkable or
core.registered_nodes[n_bottom.name].buildable_to) then
if delay then
core.after(0.1, nodeupdate_single, p, false)
else
n.level = core.get_node_level(p)
core.remove_node(p)
spawn_falling_node(p, n)
nodeupdate(p)
end
end
end
if core.get_item_group(n.name, "attached_node") ~= 0 then
if not check_attached_node(p, n) then
drop_attached_node(p)
nodeupdate(p)
end
end
end
function nodeupdate(p, delay)
-- Round p to prevent falling entities to get stuck
p = vector.round(p)
for x = -1, 1 do
for y = -1, 1 do
for z = -1, 1 do
local d = vector.new(x, y, z)
nodeupdate_single(vector.add(p, d), delay or not (x == 0 and y == 0 and z == 0))
end
end
end
end
--
-- Global callbacks
--
function on_placenode(p, node)
nodeupdate(p)
end
core.register_on_placenode(on_placenode)
function on_dignode(p, node)
nodeupdate(p)
end
core.register_on_dignode(on_dignode)
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