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                         obj:punch(obj, 1.0, {
 164                                 full_punch_interval = 1.0,
 165                                 damage_groups = {fleshy = damage},
 166                         }, nil)
 167                 end
 168         end
 169 end
 170
 171 local function add_effects(pos, radius, drops)
 172         minetest.add_particlespawner({
 173                 amount = 64,
 174                 time = 0.5,
 175                 minpos = vector.subtract(pos, radius / 2),
 176                 maxpos = vector.add(pos, radius / 2),
 177                 minvel = {x = -10, y = -10, z = -10},
 178                 maxvel = {x = 10, y = 10, z = 10},
 179                 minacc = vector.new(),
 180                 maxacc = vector.new(),
 181                 minexptime = 1,
 182                 maxexptime = 2.5,
 183                 minsize = 8,
 184                 maxsize = 16,
 185                 texture = "tnt_smoke.png",
 186         })
 187
 188         -- we just dropped some items. Look at the items entities and pick
 189         -- one of them to use as texture
 190         local texture = "tnt_blast.png" --fallback texture
 191         local most = 0
 192         for name, stack in pairs(drops) do
 193                 local count = stack:get_count()
 194                 if count > most then
 195                         most = count
 196                         local def = minetest.registered_nodes[name]
 197                         if def and def.tiles and def.tiles[1] then
 198                                 texture = def.tiles[1]
 199                         end
 200                 end
 201         end
 202
 203         minetest.add_particlespawner({
 204                 amount = 64,
 205                 time = 0.1,
 206                 minpos = vector.subtract(pos, radius / 2),
 207                 maxpos = vector.add(pos, radius / 2),
 208                 minvel = {x = -3, y = 0, z = -3},
 209                 maxvel = {x = 3, y = 5,  z = 3},
 210                 minacc = {x = 0, y = -10, z = 0},
 211                 maxacc = {x = 0, y = -10, z = 0},
 212                 minexptime = 0.8,
 213                 maxexptime = 2.0,
 214                 minsize = 2,
 215                 maxsize = 6,
 216                 texture = texture,
 217                 collisiondetection = true,
 218         })
 219 end
 220
 221 function tnt.burn(pos)
 222         local name = minetest.get_node(pos).name
 223         local group = minetest.get_item_group(name, "tnt")
 224         if group > 0 then
 225                 minetest.sound_play("tnt_ignite", {pos = pos})
 226                 minetest.set_node(pos, {name = name .. "_burning"})
 227                 minetest.get_node_timer(pos):start(1)
 228         elseif name == "tnt:gunpowder" then
 229                 minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
 230         end
 231 end
 232
 233 local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast)
 234         local pos = vector.round(pos)
 235         local vm = VoxelManip()
 236         local pr = PseudoRandom(os.time())
 237         local p1 = vector.subtract(pos, radius)
 238         local p2 = vector.add(pos, radius)
 239         local minp, maxp = vm:read_from_map(p1, p2)
 240         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 241         local data = vm:get_data()
 242
 243         local drops = {}
 244         local on_blast_queue = {}
 245
 246         local c_air = minetest.get_content_id("air")
 247         local c_fire = minetest.get_content_id("fire:basic_flame")
 248         for z = -radius, radius do
 249         for y = -radius, radius do
 250         local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
 251         for x = -radius, radius do
 252                 local r = vector.length(vector.new(x, y, z))
 253                 if (radius * radius) / (r * r) >= (pr:next(80, 125) / 100) then
 254                         local cid = data[vi]
 255                         local p = {x = pos.x + x, y = pos.y + y, z = pos.z + z}
 256                         if cid ~= c_air then
 257                                 data[vi] = destroy(drops, p, cid, c_air, c_fire,
 258                                         on_blast_queue, ignore_protection,
 259                                         ignore_on_blast)
 260                         end
 261                 end
 262                 vi = vi + 1
 263         end
 264         end
 265         end
 266
 267         vm:set_data(data)
 268         vm:write_to_map()
 269         vm:update_map()
 270         vm:update_liquids()
 271
 272         -- call nodeupdate for everything within 1.5x blast radius
 273         for z = -radius * 1.5, radius * 1.5 do
 274         for x = -radius * 1.5, radius * 1.5 do
 275         for y = -radius * 1.5, radius * 1.5 do
 276                 local s = vector.add(pos, {x = x, y = y, z = z})
 277                 local r = vector.distance(pos, s)
 278                 if r / radius < 1.4 then
 279                         nodeupdate(s)
 280                 end
 281         end
 282         end
 283         end
 284
 285         for _, data in ipairs(on_blast_queue) do
 286                 local dist = math.max(1, vector.distance(data.pos, pos))
 287                 local intensity = (radius * radius) / (dist * dist)
 288                 local node_drops = data.on_blast(data.pos, intensity)
 289                 if node_drops then
 290                         for _, item in ipairs(node_drops) do
 291                                 add_drop(drops, item)
 292                         end
 293                 end
 294         end
 295
 296         return drops
 297 end
 298
 299 function tnt.boom(pos, def)
 300         minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
 301         minetest.set_node(pos, {name = "tnt:boom"})
 302         local drops = tnt_explode(pos, def.radius, def.ignore_protection,
 303                         def.ignore_on_blast)
 304         entity_physics(pos, def.damage_radius)
 305         if not def.disable_drops then
 306                 eject_drops(drops, pos, def.radius)
 307         end
 308         add_effects(pos, def.radius, drops)
 309 end
 310
 311 minetest.register_node("tnt:boom", {
 312         drawtype = "airlike",
 313         light_source = default.LIGHT_MAX,
 314         walkable = false,
 315         drop = "",
 316         groups = {dig_immediate = 3},
 317         on_construct = function(pos)
 318                 minetest.add_particle({
 319                         pos = pos,
 320                         velocity = vector.new(),
 321                         acceleration = vector.new(),
 322                         expirationtime = 0.4,
 323                         size = 30,
 324                         collisiondetection = false,
 325                         vertical = false,
 326                         texture = "tnt_boom.png",
 327                         playername = nil,
 328                 })
 329                 minetest.get_node_timer(pos):start(0.4)
 330         end,
 331         on_timer = function(pos, elapsed)
 332                 minetest.remove_node(pos)
 333         end,
 334         -- unaffected by explosions
 335         on_blast = function() end,
 336 })
 337
 338 minetest.register_node("tnt:gunpowder", {
 339         description = "Gun Powder",
 340         drawtype = "raillike",
 341         paramtype = "light",
 342         is_ground_content = false,
 343         sunlight_propagates = true,
 344         walkable = false,
 345         tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
 346         inventory_image = "tnt_gunpowder_inventory.png",
 347         wield_image = "tnt_gunpowder_inventory.png",
 348         selection_box = {
 349                 type = "fixed",
 350                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 351         },
 352         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 353         sounds = default.node_sound_leaves_defaults(),
 354
 355         on_punch = function(pos, node, puncher)
 356                 if puncher:get_wielded_item():get_name() == "default:torch" then
 357                         tnt.burn(pos)
 358                 end
 359         end,
 360         on_blast = function(pos, intensity)
 361                 tnt.burn(pos)
 362         end,
 363 })
 364
 365 minetest.register_node("tnt:gunpowder_burning", {
 366         drawtype = "raillike",
 367         paramtype = "light",
 368         sunlight_propagates = true,
 369         walkable = false,
 370         light_source = 5,
 371         tiles = {{
 372                 name = "tnt_gunpowder_burning_straight_animated.png",
 373                 animation = {
 374                         type = "vertical_frames",
 375                         aspect_w = 16,
 376                         aspect_h = 16,
 377                         length = 1,
 378                 }
 379         },
 380         {
 381                 name = "tnt_gunpowder_burning_curved_animated.png",
 382                 animation = {
 383                         type = "vertical_frames",
 384                         aspect_w = 16,
 385                         aspect_h = 16,
 386                         length = 1,
 387                 }
 388         },
 389         {
 390                 name = "tnt_gunpowder_burning_t_junction_animated.png",
 391                 animation = {
 392                         type = "vertical_frames",
 393                         aspect_w = 16,
 394                         aspect_h = 16,
 395                         length = 1,
 396                 }
 397         },
 398         {
 399                 name = "tnt_gunpowder_burning_crossing_animated.png",
 400                 animation = {
 401                         type = "vertical_frames",
 402                         aspect_w = 16,
 403                         aspect_h = 16,
 404                         length = 1,
 405                 }
 406         }},
 407         selection_box = {
 408                 type = "fixed",
 409                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 410         },
 411         drop = "",
 412         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 413         sounds = default.node_sound_leaves_defaults(),
 414         on_timer = function(pos, elapsed)
 415                 for dx = -1, 1 do
 416                 for dz = -1, 1 do
 417                 for dy = -1, 1 do
 418                         if not (dx == 0 and dz == 0) then
 419                                 tnt.burn({
 420                                         x = pos.x + dx,
 421                                         y = pos.y + dy,
 422                                         z = pos.z + dz,
 423                                 })
 424                         end
 425                 end
 426                 end
 427                 end
 428                 minetest.remove_node(pos)
 429         end,
 430         -- unaffected by explosions
 431         on_blast = function() end,
 432         on_construct = function(pos)
 433                 minetest.sound_play("tnt_gunpowder_burning", {pos = pos, gain = 2})
 434                 minetest.get_node_timer(pos):start(1)
 435         end,
 436 })
 437
 438 minetest.register_abm({
 439         nodenames = {"group:tnt", "tnt:gunpowder"},
 440         neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 441         interval = 4,
 442         chance = 1,
 443         action = tnt.burn,
 444 })
 445
 446 minetest.register_craft({
 447         output = "tnt:gunpowder",
 448         type = "shapeless",
 449         recipe = {"default:coal_lump", "default:gravel"}
 450 })
 451
 452 minetest.register_craft({
 453         output = "tnt:tnt",
 454         recipe = {
 455                 {"",           "group:wood",    ""},
 456                 {"group:wood", "tnt:gunpowder", "group:wood"},
 457                 {"",           "group:wood",    ""}
 458         }
 459 })
 460
 461 function tnt.register_tnt(def)
 462         local name = ""
 463         if not def.name:find(':') then
 464                 name = "tnt:" .. def.name
 465         else
 466                 name = def.name
 467                 def.name = def.name:match(":([%w_]+)")
 468         end
 469         if not def.tiles then def.tiles = {} end
 470         local tnt_top = def.tiles.top or def.name .. "_top.png"
 471         local tnt_bottom = def.tiles.bottom or def.name .. "_bottom.png"
 472         local tnt_side = def.tiles.side or def.name .. "_side.png"
 473         local tnt_burning = def.tiles.burning or def.name .. "_top_burning_animated.png"
 474         if not def.damage_radius then def.damage_radius = def.radius * 2 end
 475
 476         minetest.register_node(":" .. name, {
 477                 description = def.description,
 478                 tiles = {tnt_top, tnt_bottom, tnt_side},
 479                 is_ground_content = false,
 480                 groups = {dig_immediate = 2, mesecon = 2, tnt = 1},
 481                 sounds = default.node_sound_wood_defaults(),
 482                 on_punch = function(pos, node, puncher)
 483                         if puncher:get_wielded_item():get_name() == "default:torch" then
 484                                 minetest.set_node(pos, {name = name .. "_burning"})
 485                         end
 486                 end,
 487                 on_blast = function(pos, intensity)
 488                         minetest.after(0.1, function()
 489                                 tnt.boom(pos, def)
 490                         end)
 491                 end,
 492                 mesecons = {effector =
 493                         {action_on =
 494                                 function(pos)
 495                                         tnt.boom(pos, def)
 496                                 end
 497                         }
 498                 },
 499         })
 500
 501         minetest.register_node(":" .. name .. "_burning", {
 502                 tiles = {
 503                         {
 504                                 name = tnt_burning,
 505                                 animation = {
 506                                         type = "vertical_frames",
 507                                         aspect_w = 16,
 508                                         aspect_h = 16,
 509                                         length = 1,
 510                                 }
 511                         },
 512                         tnt_bottom, tnt_side
 513                         },
 514                 light_source = 5,
 515                 drop = "",
 516                 sounds = default.node_sound_wood_defaults(),
 517                 groups = {falling_node = 1},
 518                 on_timer = function(pos, elapsed)
 519                         tnt.boom(pos, def)
 520                 end,
 521                 -- unaffected by explosions
 522                 on_blast = function() end,
 523                 on_construct = function(pos)
 524                         minetest.sound_play("tnt_ignite", {pos = pos})
 525                         minetest.get_node_timer(pos):start(4)
 526                         nodeupdate(pos)
 527                 end,
 528         })
 529 end
 530
 531 tnt.register_tnt({
 532         name = "tnt:tnt",
 533         description = "TNT",
 534         radius = radius,
 535 })
 536