Camas/mods/tnt/init.lua

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-- Default to enabled in singleplayer and disabled in multiplayer
local singleplayer = minetest.is_singleplayer()
local setting = minetest.setting_getbool("tnt_enable")
if (not singleplayer and setting ~= true) or (singleplayer and setting == false) then
return
end
-- loss probabilities array (one in X will be lost)
local loss_prob = {}
loss_prob["default:cobble"] = 3
loss_prob["default:dirt"] = 4
local radius = tonumber(minetest.setting_get("tnt_radius") or 3)
-- Fill a list with data for content IDs, after all nodes are registered
local cid_data = {}
minetest.after(
0,
function()
for name, def in pairs(minetest.registered_nodes) do
cid_data[minetest.get_content_id(name)] = {
name = name,
drops = def.drops,
on_blast = def.on_blast,
}
end
end)
local function rand_pos(center, pos, radius)
pos.x = center.x + math.random(-radius, radius)
pos.z = center.z + math.random(-radius, radius)
end
local function eject_drops(drops, pos, radius)
local drop_pos = vector.new(pos)
for _, item in pairs(drops) do
local count = item:get_count()
local max = item:get_stack_max()
if count > max then
item:set_count(max)
end
while count > 0 do
if count < max then
item:set_count(count)
end
rand_pos(pos, drop_pos, radius)
local obj = minetest.add_item(drop_pos, item)
if obj then
obj:get_luaentity().collect = true
obj:setacceleration({x=0, y=-10, z=0})
obj:setvelocity({x=math.random(-3, 3), y=10,
z=math.random(-3, 3)})
end
count = count - max
end
end
end
local function add_drop(drops, item)
item = ItemStack(item)
local name = item:get_name()
if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
return
end
local drop = drops[name]
if drop == nil then
drops[name] = item
else
drop:set_count(drop:get_count() + item:get_count())
end
end
local function destroy(drops, pos, cid)
if minetest.is_protected(pos, "") then
return
end
local def = cid_data[cid]
if def and def.on_blast then
def.on_blast(vector.new(pos), 1)
return
end
minetest.remove_node(pos)
if def then
local node_drops = minetest.get_node_drops(def.name, "")
for _, item in ipairs(node_drops) do
add_drop(drops, item)
end
end
end
local function calc_velocity(pos1, pos2, old_vel, power)
local vel = vector.direction(pos1, pos2)
vel = vector.normalize(vel)
vel = vector.multiply(vel, power)
-- Divide by distance
local dist = vector.distance(pos1, pos2)
dist = math.max(dist, 1)
vel = vector.divide(vel, dist)
-- Add old velocity
vel = vector.add(vel, old_vel)
return vel
end
local function entity_physics(pos, radius)
-- Make the damage radius larger than the destruction radius
radius = radius * 2
local no_water = (minetest.find_node_near(pos, 2, {"default:water_source"}) == nil)
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local objs = minetest.get_objects_inside_radius(pos, radius)
for _, obj in pairs(objs) do
local obj_pos = obj:getpos()
local obj_vel = obj:getvelocity()
local dist = math.max(1, vector.distance(pos, obj_pos))
if obj_vel ~= nil then
obj:setvelocity(calc_velocity(pos, obj_pos,
obj_vel, radius * 10))
end
if no_water then
local damage = (4 / dist) * radius
obj:set_hp(obj:get_hp() - damage)
end
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end
end
local function add_effects(pos, radius)
minetest.add_particlespawner(
{
amount = 128,
time = 1,
minpos = vector.subtract(pos, radius / 2),
maxpos = vector.add(pos, radius / 2),
minvel = {x=-20, y=-20, z=-20},
maxvel = {x=20, y=20, z=20},
minacc = vector.new(),
maxacc = vector.new(),
minexptime = 0.2,
maxexptime = 1,
minsize = 16,
maxsize = 24,
texture = "tnt_smoke.png",
})
end
local function burn(pos)
local name = minetest.get_node(pos).name
if name == "tnt:tnt" then
minetest.sound_play("tnt_ignite", {pos=pos})
minetest.set_node(pos, {name="tnt:tnt_burning"})
minetest.get_node_timer(pos):start(2)
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end
end
local function explode(pos, radius)
local pos = vector.round(pos)
local vm = VoxelManip()
local pr = PseudoRandom(os.time())
local p1 = vector.subtract(pos, radius)
local p2 = vector.add(pos, radius)
local minp, maxp = vm:read_from_map(p1, p2)
local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
local data = vm:get_data()
local drops = {}
local p = {}
local c_air = minetest.get_content_id("air")
for z = -radius, radius do
for y = -radius, radius do
local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
for x = -radius, radius do
if (x * x) + (y * y) + (z * z) <=
(radius * radius) + pr:next(-radius, radius) then
local cid = data[vi]
p.x = pos.x + x
p.y = pos.y + y
p.z = pos.z + z
if cid ~= c_air then
destroy(drops, p, cid)
end
end
vi = vi + 1
end
end
end
return drops
end
local function boom(pos)
minetest.sound_play("tnt_explode", {pos=pos, gain=1.5, max_hear_distance=2*64})
minetest.remove_node(pos)
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local drops = explode(pos, radius)
entity_physics(pos, radius)
eject_drops(drops, pos, radius)
add_effects(pos, radius)
end
minetest.register_node(
"tnt:tnt",
{
description = "TNT",
tiles = {"tnt_top.png", "tnt_bottom.png", "tnt_sides.png"},
is_ground_content = false,
groups = {dig_immediate=2, mesecon=2},
sounds = default.node_sound_wood_defaults(),
on_punch = function(pos, node, puncher)
local itemname = puncher:get_wielded_item():get_name()
if itemname == "default:flint_and_steel" then
burn(pos)
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end
end,
on_blast = function(pos, intensity)
burn(pos)
end,
})
minetest.register_node(
"tnt:tnt_burning",
{
tiles = {
{
name = "tnt_top_burning.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 1,
}
},
"tnt_bottom.png", "tnt_sides.png"},
light_source = 5,
drop = "",
sounds = default.node_sound_wood_defaults(),
on_timer = boom,
-- unaffected by explosions
on_blast = function() end,
})
minetest.register_craft(
{
output = "tnt:tnt",
recipe = {
{"", "group:planks", ""},
{"group:planks", "default:flint_and_steel", "group:planks"},
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{"", "group:planks", ""}
}
})
default.log("mod:tnt", "loaded")