mods/tnt/init.lua

   1 tnt = {}
   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 ~= true) or
   6                 (singleplayer and setting == false) 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                         on_blast = def.on_blast,
  27                 }
  28         end
  29 end)
  30
  31 local function rand_pos(center, pos, radius)
  32         local def
  33         local reg_nodes = minetest.registered_nodes
  34         local i = 0
  35         repeat
  36                 -- Give up and use the center if this takes too long
  37                 if i > 4 then
  38                         pos.x, pos.z = center.x, center.z
  39                         break
  40                 end
  41                 pos.x = center.x + math.random(-radius, radius)
  42                 pos.z = center.z + math.random(-radius, radius)
  43                 def = reg_nodes[minetest.get_node(pos).name]
  44                 i = i + 1
  45         until def and not def.walkable
  46 end
  47
  48 local function eject_drops(drops, pos, radius)
  49         local drop_pos = vector.new(pos)
  50         for _, item in pairs(drops) do
  51                 local count = item:get_count()
  52                 local take_est = math.log(count * count) + math.random(0,4) - 2
  53                 while count > 0 do
  54                         local take = math.max(1,math.min(take_est,
  55                                         item:get_count(),
  56                                         item:get_stack_max()))
  57                         rand_pos(pos, drop_pos, radius)
  58                         local dropitem = ItemStack(item)
  59                         dropitem:set_count(take)
  60                         local obj = minetest.add_item(drop_pos, dropitem)
  61                         if obj then
  62                                 obj:get_luaentity().collect = true
  63                                 obj:setacceleration({x = 0, y = -10, z = 0})
  64                                 obj:setvelocity({x = math.random(-3, 3),
  65                                                 y = math.random(0, 10),
  66                                                 z = math.random(-3, 3)})
  67                         end
  68                         count = count - take
  69                 end
  70         end
  71 end
  72
  73 local function add_drop(drops, item)
  74         item = ItemStack(item)
  75         local name = item:get_name()
  76         if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
  77                 return
  78         end
  79
  80         local drop = drops[name]
  81         if drop == nil then
  82                 drops[name] = item
  83         else
  84                 drop:set_count(drop:get_count() + item:get_count())
  85         end
  86 end
  87
  88
  89 local function destroy(drops, npos, cid, c_air, c_fire, on_blast_queue, ignore_protection, ignore_on_blast)
  90         if not ignore_protection and minetest.is_protected(npos, "") then
  91                 return cid
  92         end
  93
  94         local def = cid_data[cid]
  95
  96         if not def then
  97                 return c_air
  98         elseif not ignore_on_blast and def.on_blast then
  99                 on_blast_queue[#on_blast_queue + 1] = {pos = vector.new(npos), on_blast = def.on_blast}
 100                 return cid
 101         elseif def.flammable then
 102                 return c_fire
 103         else
 104                 local node_drops = minetest.get_node_drops(def.name, "")
 105                 for _, item in ipairs(node_drops) do
 106                         add_drop(drops, item)
 107                 end
 108                 return c_air
 109         end
 110 end
 111
 112
 113 local function calc_velocity(pos1, pos2, old_vel, power)
 114         local vel = vector.direction(pos1, pos2)
 115         vel = vector.normalize(vel)
 116         vel = vector.multiply(vel, power)
 117
 118         -- Divide by distance
 119         local dist = vector.distance(pos1, pos2)
 120         dist = math.max(dist, 1)
 121         vel = vector.divide(vel, dist)
 122
 123         -- Add old velocity
 124         vel = vector.add(vel, old_vel)
 125
 126         -- randomize it a bit
 127         vel = vector.add(vel, {
 128                 x = math.random() - 0.5,
 129                 y = math.random() - 0.5,
 130                 z = math.random() - 0.5,
 131         })
 132
 133         -- Limit to terminal velocity
 134         dist = vector.length(vel)
 135         if dist > 250 then
 136                 vel = vector.divide(vel, dist / 250)
 137         end
 138         return vel
 139 end
 140
 141 local function entity_physics(pos, radius)
 142         local objs = minetest.get_objects_inside_radius(pos, radius)
 143         for _, obj in pairs(objs) do
 144                 local obj_pos = obj:getpos()
 145                 local dist = math.max(1, vector.distance(pos, obj_pos))
 146
 147                 local damage = (4 / dist) * radius
 148                 if obj:is_player() then
 149                         -- currently the engine has no method to set
 150                         -- player velocity. See #2960
 151                         -- instead, we knock the player back 1.0 node, and slightly upwards
 152                         local dir = vector.normalize(vector.subtract(obj_pos, pos))
 153                         local moveoff = vector.multiply(dir, dist + 1.0)
 154                         local newpos = vector.add(pos, moveoff)
 155                         local newpos = vector.add(newpos, {x = 0, y = 0.2, z = 0})
 156                         obj:setpos(newpos)
 157
 158                         obj:set_hp(obj:get_hp() - damage)
 159                 else
 160                         local obj_vel = obj:getvelocity()
 161                         obj:setvelocity(calc_velocity(pos, obj_pos,
 162                                         obj_vel, radius * 10))
 163                         if not obj:get_armor_groups().immortal then
 164                                 obj:punch(obj, 1.0, {
 165                                         full_punch_interval = 1.0,
 166                                         damage_groups = {fleshy = damage},
 167                                 }, nil)
 168                         end
 169                 end
 170         end
 171 end
 172
 173 local function add_effects(pos, radius, drops)
 174         minetest.add_particlespawner({
 175                 amount = 64,
 176                 time = 0.5,
 177                 minpos = vector.subtract(pos, radius / 2),
 178                 maxpos = vector.add(pos, radius / 2),
 179                 minvel = {x = -10, y = -10, z = -10},
 180                 maxvel = {x = 10, y = 10, z = 10},
 181                 minacc = vector.new(),
 182                 maxacc = vector.new(),
 183                 minexptime = 1,
 184                 maxexptime = 2.5,
 185                 minsize = 8,
 186                 maxsize = 16,
 187                 texture = "tnt_smoke.png",
 188         })
 189
 190         -- we just dropped some items. Look at the items entities and pick
 191         -- one of them to use as texture
 192         local texture = "tnt_blast.png" --fallback texture
 193         local most = 0
 194         for name, stack in pairs(drops) do
 195                 local count = stack:get_count()
 196                 if count > most then
 197                         most = count
 198                         local def = minetest.registered_nodes[name]
 199                         if def and def.tiles and def.tiles[1] then
 200                                 texture = def.tiles[1]
 201                         end
 202                 end
 203         end
 204
 205         minetest.add_particlespawner({
 206                 amount = 64,
 207                 time = 0.1,
 208                 minpos = vector.subtract(pos, radius / 2),
 209                 maxpos = vector.add(pos, radius / 2),
 210                 minvel = {x = -3, y = 0, z = -3},
 211                 maxvel = {x = 3, y = 5,  z = 3},
 212                 minacc = {x = 0, y = -10, z = 0},
 213                 maxacc = {x = 0, y = -10, z = 0},
 214                 minexptime = 0.8,
 215                 maxexptime = 2.0,
 216                 minsize = 2,
 217                 maxsize = 6,
 218                 texture = texture,
 219                 collisiondetection = true,
 220         })
 221 end
 222
 223 function tnt.burn(pos)
 224         local name = minetest.get_node(pos).name
 225         local group = minetest.get_item_group(name, "tnt")
 226         if group > 0 then
 227                 minetest.sound_play("tnt_ignite", {pos = pos})
 228                 minetest.set_node(pos, {name = name .. "_burning"})
 229                 minetest.get_node_timer(pos):start(1)
 230         elseif name == "tnt:gunpowder" then
 231                 minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
 232         end
 233 end
 234
 235 local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast)
 236         local pos = vector.round(pos)
 237         local vm = VoxelManip()
 238         local pr = PseudoRandom(os.time())
 239         local p1 = vector.subtract(pos, radius)
 240         local p2 = vector.add(pos, radius)
 241         local minp, maxp = vm:read_from_map(p1, p2)
 242         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 243         local data = vm:get_data()
 244
 245         local drops = {}
 246         local on_blast_queue = {}
 247
 248         local c_air = minetest.get_content_id("air")
 249         local c_fire = minetest.get_content_id("fire:basic_flame")
 250         for z = -radius, radius do
 251         for y = -radius, radius do
 252         local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
 253         for x = -radius, radius do
 254                 local r = vector.length(vector.new(x, y, z))
 255                 if (radius * radius) / (r * r) >= (pr:next(80, 125) / 100) then
 256                         local cid = data[vi]
 257                         local p = {x = pos.x + x, y = pos.y + y, z = pos.z + z}
 258                         if cid ~= c_air then
 259                                 data[vi] = destroy(drops, p, cid, c_air, c_fire,
 260                                         on_blast_queue, ignore_protection,
 261                                         ignore_on_blast)
 262                         end
 263                 end
 264                 vi = vi + 1
 265         end
 266         end
 267         end
 268
 269         vm:set_data(data)
 270         vm:write_to_map()
 271         vm:update_map()
 272         vm:update_liquids()
 273
 274         -- call nodeupdate for everything within 1.5x blast radius
 275         for z = -radius * 1.5, radius * 1.5 do
 276         for x = -radius * 1.5, radius * 1.5 do
 277         for y = -radius * 1.5, radius * 1.5 do
 278                 local s = vector.add(pos, {x = x, y = y, z = z})
 279                 local r = vector.distance(pos, s)
 280                 if r / radius < 1.4 then
 281                         nodeupdate(s)
 282                 end
 283         end
 284         end
 285         end
 286
 287         for _, data in ipairs(on_blast_queue) do
 288                 local dist = math.max(1, vector.distance(data.pos, pos))
 289                 local intensity = (radius * radius) / (dist * dist)
 290                 local node_drops = data.on_blast(data.pos, intensity)
 291                 if node_drops then
 292                         for _, item in ipairs(node_drops) do
 293                                 add_drop(drops, item)
 294                         end
 295                 end
 296         end
 297
 298         return drops
 299 end
 300
 301 function tnt.boom(pos, def)
 302         minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
 303         minetest.set_node(pos, {name = "tnt:boom"})
 304         local drops = tnt_explode(pos, def.radius, def.ignore_protection,
 305                         def.ignore_on_blast)
 306         entity_physics(pos, def.damage_radius)
 307         if not def.disable_drops then
 308                 eject_drops(drops, pos, def.radius)
 309         end
 310         add_effects(pos, def.radius, drops)
 311 end
 312
 313 minetest.register_node("tnt:boom", {
 314         drawtype = "airlike",
 315         light_source = default.LIGHT_MAX,
 316         walkable = false,
 317         drop = "",
 318         groups = {dig_immediate = 3},
 319         on_construct = function(pos)
 320                 minetest.add_particle({
 321                         pos = pos,
 322                         velocity = vector.new(),
 323                         acceleration = vector.new(),
 324                         expirationtime = 0.4,
 325                         size = 30,
 326                         collisiondetection = false,
 327                         vertical = false,
 328                         texture = "tnt_boom.png",
 329                         playername = nil,
 330                 })
 331                 minetest.get_node_timer(pos):start(0.4)
 332         end,
 333         on_timer = function(pos, elapsed)
 334                 minetest.remove_node(pos)
 335         end,
 336         -- unaffected by explosions
 337         on_blast = function() end,
 338 })
 339
 340 minetest.register_node("tnt:gunpowder", {
 341         description = "Gun Powder",
 342         drawtype = "raillike",
 343         paramtype = "light",
 344         is_ground_content = false,
 345         sunlight_propagates = true,
 346         walkable = false,
 347         tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
 348         inventory_image = "tnt_gunpowder_inventory.png",
 349         wield_image = "tnt_gunpowder_inventory.png",
 350         selection_box = {
 351                 type = "fixed",
 352                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 353         },
 354         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 355         sounds = default.node_sound_leaves_defaults(),
 356
 357         on_punch = function(pos, node, puncher)
 358                 if puncher:get_wielded_item():get_name() == "default:torch" then
 359                         tnt.burn(pos)
 360                 end
 361         end,
 362         on_blast = function(pos, intensity)
 363                 tnt.burn(pos)
 364         end,
 365 })
 366
 367 minetest.register_node("tnt:gunpowder_burning", {
 368         drawtype = "raillike",
 369         paramtype = "light",
 370         sunlight_propagates = true,
 371         walkable = false,
 372         light_source = 5,
 373         tiles = {{
 374                 name = "tnt_gunpowder_burning_straight_animated.png",
 375                 animation = {
 376                         type = "vertical_frames",
 377                         aspect_w = 16,
 378                         aspect_h = 16,
 379                         length = 1,
 380                 }
 381         },
 382         {
 383                 name = "tnt_gunpowder_burning_curved_animated.png",
 384                 animation = {
 385                         type = "vertical_frames",
 386                         aspect_w = 16,
 387                         aspect_h = 16,
 388                         length = 1,
 389                 }
 390         },
 391         {
 392                 name = "tnt_gunpowder_burning_t_junction_animated.png",
 393                 animation = {
 394                         type = "vertical_frames",
 395                         aspect_w = 16,
 396                         aspect_h = 16,
 397                         length = 1,
 398                 }
 399         },
 400         {
 401                 name = "tnt_gunpowder_burning_crossing_animated.png",
 402                 animation = {
 403                         type = "vertical_frames",
 404                         aspect_w = 16,
 405                         aspect_h = 16,
 406                         length = 1,
 407                 }
 408         }},
 409         selection_box = {
 410                 type = "fixed",
 411                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 412         },
 413         drop = "",
 414         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 415         sounds = default.node_sound_leaves_defaults(),
 416         on_timer = function(pos, elapsed)
 417                 for dx = -1, 1 do
 418                 for dz = -1, 1 do
 419                 for dy = -1, 1 do
 420                         if not (dx == 0 and dz == 0) then
 421                                 tnt.burn({
 422                                         x = pos.x + dx,
 423                                         y = pos.y + dy,
 424                                         z = pos.z + dz,
 425                                 })
 426                         end
 427                 end
 428                 end
 429                 end
 430                 minetest.remove_node(pos)
 431         end,
 432         -- unaffected by explosions
 433         on_blast = function() end,
 434         on_construct = function(pos)
 435                 minetest.sound_play("tnt_gunpowder_burning", {pos = pos, gain = 2})
 436                 minetest.get_node_timer(pos):start(1)
 437         end,
 438 })
 439
 440 minetest.register_abm({
 441         nodenames = {"group:tnt", "tnt:gunpowder"},
 442         neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 443         interval = 4,
 444         chance = 1,
 445         action = tnt.burn,
 446 })
 447
 448 minetest.register_craft({
 449         output = "tnt:gunpowder",
 450         type = "shapeless",
 451         recipe = {"default:coal_lump", "default:gravel"}
 452 })
 453
 454 minetest.register_craft({
 455         output = "tnt:tnt",
 456         recipe = {
 457                 {"",           "group:wood",    ""},
 458                 {"group:wood", "tnt:gunpowder", "group:wood"},
 459                 {"",           "group:wood",    ""}
 460         }
 461 })
 462
 463 function tnt.register_tnt(def)
 464         local name = ""
 465         if not def.name:find(':') then
 466                 name = "tnt:" .. def.name
 467         else
 468                 name = def.name
 469                 def.name = def.name:match(":([%w_]+)")
 470         end
 471         if not def.tiles then def.tiles = {} end
 472         local tnt_top = def.tiles.top or def.name .. "_top.png"
 473         local tnt_bottom = def.tiles.bottom or def.name .. "_bottom.png"
 474         local tnt_side = def.tiles.side or def.name .. "_side.png"
 475         local tnt_burning = def.tiles.burning or def.name .. "_top_burning_animated.png"
 476         if not def.damage_radius then def.damage_radius = def.radius * 2 end
 477
 478         minetest.register_node(":" .. name, {
 479                 description = def.description,
 480                 tiles = {tnt_top, tnt_bottom, tnt_side},
 481                 is_ground_content = false,
 482                 groups = {dig_immediate = 2, mesecon = 2, tnt = 1},
 483                 sounds = default.node_sound_wood_defaults(),
 484                 on_punch = function(pos, node, puncher)
 485                         if puncher:get_wielded_item():get_name() == "default:torch" then
 486                                 minetest.set_node(pos, {name = name .. "_burning"})
 487                         end
 488                 end,
 489                 on_blast = function(pos, intensity)
 490                         minetest.after(0.1, function()
 491                                 tnt.boom(pos, def)
 492                         end)
 493                 end,
 494                 mesecons = {effector =
 495                         {action_on =
 496                                 function(pos)
 497                                         tnt.boom(pos, def)
 498                                 end
 499                         }
 500                 },
 501         })
 502
 503         minetest.register_node(":" .. name .. "_burning", {
 504                 tiles = {
 505                         {
 506                                 name = tnt_burning,
 507                                 animation = {
 508                                         type = "vertical_frames",
 509                                         aspect_w = 16,
 510                                         aspect_h = 16,
 511                                         length = 1,
 512                                 }
 513                         },
 514                         tnt_bottom, tnt_side
 515                         },
 516                 light_source = 5,
 517                 drop = "",
 518                 sounds = default.node_sound_wood_defaults(),
 519                 groups = {falling_node = 1},
 520                 on_timer = function(pos, elapsed)
 521                         tnt.boom(pos, def)
 522                 end,
 523                 -- unaffected by explosions
 524                 on_blast = function() end,
 525                 on_construct = function(pos)
 526                         minetest.sound_play("tnt_ignite", {pos = pos})
 527                         minetest.get_node_timer(pos):start(4)
 528                         nodeupdate(pos)
 529                 end,
 530         })
 531 end
 532
 533 tnt.register_tnt({
 534         name = "tnt:tnt",
 535         description = "TNT",
 536         radius = radius,
 537 })
 538