mods/tnt/init.lua

   1
   2 -- Default to enabled in singleplayer and disabled in multiplayer
   3 local singleplayer = minetest.is_singleplayer()
   4 local setting = minetest.setting_getbool("enable_tnt")
   5 if (not singleplayer and setting ~= false) or
   6                 (singleplayer and setting ~= true) then
   7         return
   8 end
   9
  10 -- loss probabilities array (one in X will be lost)
  11 local loss_prob = {}
  12
  13 loss_prob["default:cobble"] = 3
  14 loss_prob["default:dirt"] = 4
  15
  16 local radius = tonumber(minetest.setting_get("tnt_radius") or 3)
  17
  18 -- Fill a list with data for content IDs, after all nodes are registered
  19 local cid_data = {}
  20 minetest.after(0, function()
  21         for name, def in pairs(minetest.registered_nodes) do
  22                 cid_data[minetest.get_content_id(name)] = {
  23                         name = name,
  24                         drops = def.drops,
  25                         flammable = def.groups.flammable,
  26                 }
  27         end
  28 end)
  29
  30 local function rand_pos(center, pos, radius)
  31         pos.x = center.x + math.random(-radius, radius)
  32         pos.z = center.z + math.random(-radius, radius)
  33 end
  34
  35 local function eject_drops(drops, pos, radius)
  36         local drop_pos = vector.new(pos)
  37         for _, item in pairs(drops) do
  38                 local count = item:get_count()
  39                 local max = item:get_stack_max()
  40                 if count > max then
  41                         item:set_count(max)
  42                 end
  43                 while count > 0 do
  44                         if count < max then
  45                                 item:set_count(count)
  46                         end
  47                         rand_pos(pos, drop_pos, radius)
  48                         local obj = minetest.add_item(drop_pos, item)
  49                         if obj then
  50                                 obj:get_luaentity().collect = true
  51                                 obj:setacceleration({x=0, y=-10, z=0})
  52                                 obj:setvelocity({x=math.random(-3, 3), y=10,
  53                                                 z=math.random(-3, 3)})
  54                         end
  55                         count = count - max
  56                 end
  57         end
  58 end
  59
  60 local function add_drop(drops, item)
  61         item = ItemStack(item)
  62         local name = item:get_name()
  63         if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
  64                 return
  65         end
  66
  67         local drop = drops[name]
  68         if drop == nil then
  69                 drops[name] = item
  70         else
  71                 drop:set_count(drop:get_count() + item:get_count())
  72         end
  73 end
  74
  75 local fire_node = {name="fire:basic_flame"}
  76
  77 local function destroy(drops, pos, cid)
  78         if minetest.is_protected(pos, "") then
  79                 return
  80         end
  81         local def = cid_data[cid]
  82         if def and def.flammable then
  83                 minetest.set_node(pos, fire_node)
  84         else
  85                 minetest.remove_node(pos)
  86                 if def then
  87                         local node_drops = minetest.get_node_drops(def.name, "")
  88                         for _, item in ipairs(node_drops) do
  89                                 add_drop(drops, item)
  90                         end
  91                 end
  92         end
  93 end
  94
  95
  96 local function calc_velocity(pos1, pos2, old_vel, power)
  97         local vel = vector.direction(pos1, pos2)
  98         vel = vector.normalize(vel)
  99         vel = vector.multiply(vel, power)
 100
 101         -- Divide by distance
 102         local dist = vector.distance(pos1, pos2)
 103         dist = math.max(dist, 1)
 104         vel = vector.divide(vel, dist)
 105
 106         -- Add old velocity
 107         vel = vector.add(vel, old_vel)
 108         return vel
 109 end
 110
 111 local function entity_physics(pos, radius)
 112         -- Make the damage radius larger than the destruction radius
 113         radius = radius * 2
 114         local objs = minetest.get_objects_inside_radius(pos, radius)
 115         for _, obj in pairs(objs) do
 116                 local obj_pos = obj:getpos()
 117                 local obj_vel = obj:getvelocity()
 118                 local dist = math.max(1, vector.distance(pos, obj_pos))
 119
 120                 if obj_vel ~= nil then
 121                         obj:setvelocity(calc_velocity(pos, obj_pos,
 122                                         obj_vel, radius * 10))
 123                 end
 124
 125                 local damage = (4 / dist) * radius
 126                 obj:set_hp(obj:get_hp() - damage)
 127         end
 128 end
 129
 130 local function add_effects(pos, radius)
 131         minetest.add_particlespawner({
 132                 amount = 128,
 133                 time = 1,
 134                 minpos = vector.subtract(pos, radius / 2),
 135                 maxpos = vector.add(pos, radius / 2),
 136                 minvel = {x=-20, y=-20, z=-20},
 137                 maxvel = {x=20,  y=20,  z=20},
 138                 minacc = vector.new(),
 139                 maxacc = vector.new(),
 140                 minexptime = 1,
 141                 maxexptime = 3,
 142                 minsize = 8,
 143                 maxsize = 16,
 144                 texture = "tnt_smoke.png",
 145         })
 146 end
 147
 148 local function burn(pos)
 149         local name = minetest.get_node(pos).name
 150         if name == "tnt:tnt" then
 151                 minetest.sound_play("tnt_ignite", {pos=pos})
 152                 minetest.set_node(pos, {name="tnt:tnt_burning"})
 153                 minetest.get_node_timer(pos):start(1)
 154         elseif name == "tnt:gunpowder" then
 155                 minetest.sound_play("tnt_gunpowder_burning", {pos=pos, gain=2})
 156                 minetest.set_node(pos, {name="tnt:gunpowder_burning"})
 157                 minetest.get_node_timer(pos):start(1)
 158         end
 159 end
 160
 161 local function explode(pos, radius)
 162         local pos = vector.round(pos)
 163         local vm = VoxelManip()
 164         local pr = PseudoRandom(os.time())
 165         local p1 = vector.subtract(pos, radius)
 166         local p2 = vector.add(pos, radius)
 167         local minp, maxp = vm:read_from_map(p1, p2)
 168         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 169         local data = vm:get_data()
 170
 171         local drops = {}
 172         local p = {}
 173
 174         local c_air = minetest.get_content_id("air")
 175         local c_tnt = minetest.get_content_id("tnt:tnt")
 176         local c_tnt_burning = minetest.get_content_id("tnt:tnt_burning")
 177         local c_gunpowder = minetest.get_content_id("tnt:gunpowder")
 178         local c_gunpowder_burning = minetest.get_content_id("tnt:gunpowder_burning")
 179         local c_boom = minetest.get_content_id("tnt:boom")
 180         local c_fire = minetest.get_content_id("fire:basic_flame")
 181
 182         for z = -radius, radius do
 183         for y = -radius, radius do
 184         local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
 185         for x = -radius, radius do
 186                 if (x * x) + (y * y) + (z * z) <=
 187                                 (radius * radius) + pr:next(-radius, radius) then
 188                         local cid = data[vi]
 189                         p.x = pos.x + x
 190                         p.y = pos.y + y
 191                         p.z = pos.z + z
 192                         if cid == c_tnt or cid == c_gunpowder then
 193                                 burn(p)
 194                         elseif cid ~= c_tnt_burning and
 195                                         cid ~= c_gunpowder_burning and
 196                                         cid ~= c_air and
 197                                         cid ~= c_fire and
 198                                         cid ~= c_boom then
 199                                 destroy(drops, p, cid)
 200                         end
 201                 end
 202                 vi = vi + 1
 203         end
 204         end
 205         end
 206
 207         return drops
 208 end
 209
 210
 211 local function boom(pos)
 212         minetest.sound_play("tnt_explode", {pos=pos, gain=1.5, max_hear_distance=2*64})
 213         minetest.set_node(pos, {name="tnt:boom"})
 214         minetest.get_node_timer(pos):start(0.5)
 215
 216         local drops = explode(pos, radius)
 217         entity_physics(pos, radius)
 218         eject_drops(drops, pos, radius)
 219         add_effects(pos, radius)
 220 end
 221
 222 minetest.register_node("tnt:tnt", {
 223         description = "TNT",
 224         tiles = {"tnt_top.png", "tnt_bottom.png", "tnt_side.png"},
 225         groups = {dig_immediate=2, mesecon=2},
 226         sounds = default.node_sound_wood_defaults(),
 227         on_punch = function(pos, node, puncher)
 228                 if puncher:get_wielded_item():get_name() == "default:torch" then
 229                         minetest.sound_play("tnt_ignite", {pos=pos})
 230                         minetest.set_node(pos, {name="tnt:tnt_burning"})
 231                         minetest.get_node_timer(pos):start(4)
 232                 end
 233         end,
 234         mesecons = {effector = {action_on = boom}},
 235 })
 236
 237 minetest.register_node("tnt:tnt_burning", {
 238         tiles = {
 239                 {
 240                         name = "tnt_top_burning_animated.png",
 241                         animation = {
 242                                 type = "vertical_frames",
 243                                 aspect_w = 16,
 244                                 aspect_h = 16,
 245                                 length = 1,
 246                         }
 247                 },
 248                 "tnt_bottom.png", "tnt_side.png"},
 249         light_source = 5,
 250         drop = "",
 251         sounds = default.node_sound_wood_defaults(),
 252         on_timer = boom,
 253 })
 254
 255 minetest.register_node("tnt:boom", {
 256         drawtype = "plantlike",
 257         tiles = {"tnt_boom.png"},
 258         light_source = LIGHT_MAX,
 259         walkable = false,
 260         drop = "",
 261         groups = {dig_immediate=3},
 262         on_timer = function(pos, elapsed)
 263                 minetest.remove_node(pos)
 264         end,
 265 })
 266
 267 minetest.register_node("tnt:gunpowder", {
 268         description = "Gun Powder",
 269         drawtype = "raillike",
 270         paramtype = "light",
 271         sunlight_propagates = true,
 272         walkable = false,
 273         tiles = {"tnt_gunpowder.png",},
 274         inventory_image = "tnt_gunpowder_inventory.png",
 275         wield_image = "tnt_gunpowder_inventory.png",
 276         selection_box = {
 277                 type = "fixed",
 278                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 279         },
 280         groups = {dig_immediate=2,attached_node=1},
 281         sounds = default.node_sound_leaves_defaults(),
 282
 283         on_punch = function(pos, node, puncher)
 284                 if puncher:get_wielded_item():get_name() == "default:torch" then
 285                         burn(pos)
 286                 end
 287         end,
 288 })
 289
 290 minetest.register_node("tnt:gunpowder_burning", {
 291         drawtype = "raillike",
 292         paramtype = "light",
 293         sunlight_propagates = true,
 294         walkable = false,
 295         light_source = 5,
 296         tiles = {{
 297                 name = "tnt_gunpowder_burning_animated.png",
 298                 animation = {
 299                         type = "vertical_frames",
 300                         aspect_w = 16,
 301                         aspect_h = 16,
 302                         length = 1,
 303                 }
 304         }},
 305         selection_box = {
 306                 type = "fixed",
 307                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 308         },
 309         drop = "",
 310         groups = {dig_immediate=2,attached_node=1},
 311         sounds = default.node_sound_leaves_defaults(),
 312         on_timer = function(pos, elapsed)
 313                 for dx = -1, 1 do
 314                 for dz = -1, 1 do
 315                 for dy = -1, 1 do
 316                         if not (dx == 0 and dz == 0) then
 317                                 burn({
 318                                         x = pos.x + dx,
 319                                         y = pos.y + dy,
 320                                         z = pos.z + dz,
 321                                 })
 322                         end
 323                 end
 324                 end
 325                 end
 326                 minetest.remove_node(pos)
 327         end
 328 })
 329
 330 minetest.register_abm({
 331         nodenames = {"tnt:tnt", "tnt:gunpowder"},
 332         neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 333         interval = 1,
 334         chance = 1,
 335         action = burn,
 336 })
 337
 338 minetest.register_craft({
 339         output = "tnt:gunpowder",
 340         type = "shapeless",
 341         recipe = {"default:coal_lump", "default:gravel"}
 342 })
 343
 344 minetest.register_craft({
 345         output = "tnt:tnt",
 346         recipe = {
 347                 {"",           "group:wood",    ""},
 348                 {"group:wood", "tnt:gunpowder", "group:wood"},
 349                 {"",           "group:wood",    ""}
 350         }
 351 })
 352
 353 if minetest.setting_get("log_mods") then
 354         minetest.debug("[TNT] Loaded!")
 355 end
 356