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 ~= 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 max = item:get_stack_max()
  53                 if count > max then
  54                         item:set_count(max)
  55                 end
  56                 while count > 0 do
  57                         if count < max then
  58                                 item:set_count(count)
  59                         end
  60                         rand_pos(pos, drop_pos, radius)
  61                         local obj = minetest.add_item(drop_pos, item)
  62                         if obj then
  63                                 obj:get_luaentity().collect = true
  64                                 obj:setacceleration({x=0, y=-10, z=0})
  65                                 obj:setvelocity({x=math.random(-3, 3), y=10,
  66                                                 z=math.random(-3, 3)})
  67                         end
  68                         count = count - max
  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 local fire_node = {name="fire:basic_flame"}
  89
  90 local function destroy(drops, pos, cid)
  91         if minetest.is_protected(pos, "") then
  92                 return
  93         end
  94         local def = cid_data[cid]
  95         if def and def.on_blast then
  96                 def.on_blast(vector.new(pos), 1)
  97                 return
  98         end
  99         if def and def.flammable then
 100                 minetest.set_node(pos, fire_node)
 101         else
 102                 minetest.remove_node(pos)
 103                 if def then
 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                 end
 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         return vel
 126 end
 127
 128 local function entity_physics(pos, radius)
 129         -- Make the damage radius larger than the destruction radius
 130         radius = radius * 2
 131         local objs = minetest.get_objects_inside_radius(pos, radius)
 132         for _, obj in pairs(objs) do
 133                 local obj_pos = obj:getpos()
 134                 local obj_vel = obj:getvelocity()
 135                 local dist = math.max(1, vector.distance(pos, obj_pos))
 136
 137                 if obj_vel ~= nil then
 138                         obj:setvelocity(calc_velocity(pos, obj_pos,
 139                                         obj_vel, radius * 10))
 140                 end
 141
 142                 local damage = (4 / dist) * radius
 143                 obj:set_hp(obj:get_hp() - damage)
 144         end
 145 end
 146
 147 local function add_effects(pos, radius)
 148         minetest.add_particlespawner({
 149                 amount = 128,
 150                 time = 1,
 151                 minpos = vector.subtract(pos, radius / 2),
 152                 maxpos = vector.add(pos, radius / 2),
 153                 minvel = {x=-20, y=-20, z=-20},
 154                 maxvel = {x=20,  y=20,  z=20},
 155                 minacc = vector.new(),
 156                 maxacc = vector.new(),
 157                 minexptime = 1,
 158                 maxexptime = 3,
 159                 minsize = 8,
 160                 maxsize = 16,
 161                 texture = "tnt_smoke.png",
 162         })
 163 end
 164
 165 local function burn(pos)
 166         local name = minetest.get_node(pos).name
 167         if name == "tnt:tnt" then
 168                 minetest.sound_play("tnt_ignite", {pos=pos})
 169                 minetest.set_node(pos, {name="tnt:tnt_burning"})
 170                 minetest.get_node_timer(pos):start(1)
 171         elseif name == "tnt:gunpowder" then
 172                 minetest.sound_play("tnt_gunpowder_burning", {pos=pos, gain=2})
 173                 minetest.set_node(pos, {name="tnt:gunpowder_burning"})
 174                 minetest.get_node_timer(pos):start(1)
 175         end
 176 end
 177
 178 local function explode(pos, radius)
 179         local pos = vector.round(pos)
 180         local vm = VoxelManip()
 181         local pr = PseudoRandom(os.time())
 182         local p1 = vector.subtract(pos, radius)
 183         local p2 = vector.add(pos, radius)
 184         local minp, maxp = vm:read_from_map(p1, p2)
 185         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 186         local data = vm:get_data()
 187
 188         local drops = {}
 189         local p = {}
 190
 191         local c_air = minetest.get_content_id("air")
 192
 193         for z = -radius, radius do
 194         for y = -radius, radius do
 195         local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
 196         for x = -radius, radius do
 197                 if (x * x) + (y * y) + (z * z) <=
 198                                 (radius * radius) + pr:next(-radius, radius) then
 199                         local cid = data[vi]
 200                         p.x = pos.x + x
 201                         p.y = pos.y + y
 202                         p.z = pos.z + z
 203                         if cid ~= c_air then
 204                                 destroy(drops, p, cid)
 205                         end
 206                 end
 207                 vi = vi + 1
 208         end
 209         end
 210         end
 211
 212         return drops
 213 end
 214
 215
 216 local function boom(pos)
 217         minetest.sound_play("tnt_explode", {pos=pos, gain=1.5, max_hear_distance=2*64})
 218         minetest.set_node(pos, {name="tnt:boom"})
 219         minetest.get_node_timer(pos):start(0.5)
 220
 221         local drops = explode(pos, radius)
 222         entity_physics(pos, radius)
 223         eject_drops(drops, pos, radius)
 224         add_effects(pos, radius)
 225 end
 226
 227 minetest.register_node("tnt:tnt", {
 228         description = "TNT",
 229         tiles = {"tnt_top.png", "tnt_bottom.png", "tnt_side.png"},
 230         is_ground_content = false,
 231         groups = {dig_immediate=2, mesecon=2},
 232         sounds = default.node_sound_wood_defaults(),
 233         on_punch = function(pos, node, puncher)
 234                 if puncher:get_wielded_item():get_name() == "default:torch" then
 235                         minetest.sound_play("tnt_ignite", {pos=pos})
 236                         minetest.set_node(pos, {name="tnt:tnt_burning"})
 237                         minetest.get_node_timer(pos):start(4)
 238                 end
 239         end,
 240         on_blast = function(pos, intensity)
 241                 burn(pos)
 242         end,
 243         mesecons = {effector = {action_on = boom}},
 244 })
 245
 246 minetest.register_node("tnt:tnt_burning", {
 247         tiles = {
 248                 {
 249                         name = "tnt_top_burning_animated.png",
 250                         animation = {
 251                                 type = "vertical_frames",
 252                                 aspect_w = 16,
 253                                 aspect_h = 16,
 254                                 length = 1,
 255                         }
 256                 },
 257                 "tnt_bottom.png", "tnt_side.png"},
 258         light_source = 5,
 259         drop = "",
 260         sounds = default.node_sound_wood_defaults(),
 261         on_timer = boom,
 262         -- unaffected by explosions
 263         on_blast = function() end,
 264 })
 265
 266 minetest.register_node("tnt:boom", {
 267         drawtype = "plantlike",
 268         tiles = {"tnt_boom.png"},
 269         light_source = default.LIGHT_MAX,
 270         walkable = false,
 271         drop = "",
 272         groups = {dig_immediate=3},
 273         on_timer = function(pos, elapsed)
 274                 minetest.remove_node(pos)
 275         end,
 276         -- unaffected by explosions
 277         on_blast = function() end,
 278 })
 279
 280 minetest.register_node("tnt:gunpowder", {
 281         description = "Gun Powder",
 282         drawtype = "raillike",
 283         paramtype = "light",
 284         is_ground_content = false,
 285         sunlight_propagates = true,
 286         walkable = false,
 287         tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
 288         inventory_image = "tnt_gunpowder_inventory.png",
 289         wield_image = "tnt_gunpowder_inventory.png",
 290         selection_box = {
 291                 type = "fixed",
 292                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 293         },
 294         groups = {dig_immediate=2,attached_node=1,connect_to_raillike=minetest.raillike_group("gunpowder")},
 295         sounds = default.node_sound_leaves_defaults(),
 296
 297         on_punch = function(pos, node, puncher)
 298                 if puncher:get_wielded_item():get_name() == "default:torch" then
 299                         burn(pos)
 300                 end
 301         end,
 302         on_blast = function(pos, intensity)
 303                 burn(pos)
 304         end,
 305 })
 306
 307 minetest.register_node("tnt:gunpowder_burning", {
 308         drawtype = "raillike",
 309         paramtype = "light",
 310         sunlight_propagates = true,
 311         walkable = false,
 312         light_source = 5,
 313         tiles = {{
 314                 name = "tnt_gunpowder_burning_straight_animated.png",
 315                 animation = {
 316                         type = "vertical_frames",
 317                         aspect_w = 16,
 318                         aspect_h = 16,
 319                         length = 1,
 320                 }
 321         },
 322         {
 323                 name = "tnt_gunpowder_burning_curved_animated.png",
 324                 animation = {
 325                         type = "vertical_frames",
 326                         aspect_w = 16,
 327                         aspect_h = 16,
 328                         length = 1,
 329                 }
 330         },
 331         {
 332                 name = "tnt_gunpowder_burning_t_junction_animated.png",
 333                 animation = {
 334                         type = "vertical_frames",
 335                         aspect_w = 16,
 336                         aspect_h = 16,
 337                         length = 1,
 338                 }
 339         },
 340         {
 341                 name = "tnt_gunpowder_burning_crossing_animated.png",
 342                 animation = {
 343                         type = "vertical_frames",
 344                         aspect_w = 16,
 345                         aspect_h = 16,
 346                         length = 1,
 347                 }
 348         }},
 349         selection_box = {
 350                 type = "fixed",
 351                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 352         },
 353         drop = "",
 354         groups = {dig_immediate=2,attached_node=1,connect_to_raillike=minetest.raillike_group("gunpowder")},
 355         sounds = default.node_sound_leaves_defaults(),
 356         on_timer = function(pos, elapsed)
 357                 for dx = -1, 1 do
 358                 for dz = -1, 1 do
 359                 for dy = -1, 1 do
 360                         if not (dx == 0 and dz == 0) then
 361                                 burn({
 362                                         x = pos.x + dx,
 363                                         y = pos.y + dy,
 364                                         z = pos.z + dz,
 365                                 })
 366                         end
 367                 end
 368                 end
 369                 end
 370                 minetest.remove_node(pos)
 371         end,
 372         -- unaffected by explosions
 373         on_blast = function() end,
 374 })
 375
 376 minetest.register_abm({
 377         nodenames = {"tnt:tnt", "tnt:gunpowder"},
 378         neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 379         interval = 4,
 380         chance = 1,
 381         action = burn,
 382 })
 383
 384 minetest.register_craft({
 385         output = "tnt:gunpowder",
 386         type = "shapeless",
 387         recipe = {"default:coal_lump", "default:gravel"}
 388 })
 389
 390 minetest.register_craft({
 391         output = "tnt:tnt",
 392         recipe = {
 393                 {"",           "group:wood",    ""},
 394                 {"group:wood", "tnt:gunpowder", "group:wood"},
 395                 {"",           "group:wood",    ""}
 396         }
 397 })
 398
 399 if minetest.setting_get("log_mods") then
 400         minetest.debug("[TNT] Loaded!")
 401 end
 402