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         pos.x = center.x + math.random(-radius, radius)
  33         pos.z = center.z + math.random(-radius, radius)
  34 end
  35
  36 local function eject_drops(drops, pos, radius)
  37         local drop_pos = vector.new(pos)
  38         for _, item in pairs(drops) do
  39                 local count = item:get_count()
  40                 local max = item:get_stack_max()
  41                 if count > max then
  42                         item:set_count(max)
  43                 end
  44                 while count > 0 do
  45                         if count < max then
  46                                 item:set_count(count)
  47                         end
  48                         rand_pos(pos, drop_pos, radius)
  49                         local obj = minetest.add_item(drop_pos, item)
  50                         if obj then
  51                                 obj:get_luaentity().collect = true
  52                                 obj:setacceleration({x=0, y=-10, z=0})
  53                                 obj:setvelocity({x=math.random(-3, 3), y=10,
  54                                                 z=math.random(-3, 3)})
  55                         end
  56                         count = count - max
  57                 end
  58         end
  59 end
  60
  61 local function add_drop(drops, item)
  62         item = ItemStack(item)
  63         local name = item:get_name()
  64         if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
  65                 return
  66         end
  67
  68         local drop = drops[name]
  69         if drop == nil then
  70                 drops[name] = item
  71         else
  72                 drop:set_count(drop:get_count() + item:get_count())
  73         end
  74 end
  75
  76 local fire_node = {name="fire:basic_flame"}
  77
  78 local function destroy(drops, pos, cid)
  79         if minetest.is_protected(pos, "") then
  80                 return
  81         end
  82         local def = cid_data[cid]
  83         if def and def.on_blast then
  84                 def.on_blast(vector.new(pos), 1)
  85                 return
  86         end
  87         if def and def.flammable then
  88                 minetest.set_node(pos, fire_node)
  89         else
  90                 minetest.remove_node(pos)
  91                 if def then
  92                         local node_drops = minetest.get_node_drops(def.name, "")
  93                         for _, item in ipairs(node_drops) do
  94                                 add_drop(drops, item)
  95                         end
  96                 end
  97         end
  98 end
  99
 100
 101 local function calc_velocity(pos1, pos2, old_vel, power)
 102         local vel = vector.direction(pos1, pos2)
 103         vel = vector.normalize(vel)
 104         vel = vector.multiply(vel, power)
 105
 106         -- Divide by distance
 107         local dist = vector.distance(pos1, pos2)
 108         dist = math.max(dist, 1)
 109         vel = vector.divide(vel, dist)
 110
 111         -- Add old velocity
 112         vel = vector.add(vel, old_vel)
 113         return vel
 114 end
 115
 116 local function entity_physics(pos, radius)
 117         -- Make the damage radius larger than the destruction radius
 118         radius = radius * 2
 119         local objs = minetest.get_objects_inside_radius(pos, radius)
 120         for _, obj in pairs(objs) do
 121                 local obj_pos = obj:getpos()
 122                 local obj_vel = obj:getvelocity()
 123                 local dist = math.max(1, vector.distance(pos, obj_pos))
 124
 125                 if obj_vel ~= nil then
 126                         obj:setvelocity(calc_velocity(pos, obj_pos,
 127                                         obj_vel, radius * 10))
 128                 end
 129
 130                 local damage = (4 / dist) * radius
 131                 obj:set_hp(obj:get_hp() - damage)
 132         end
 133 end
 134
 135 local function add_effects(pos, radius)
 136         minetest.add_particlespawner({
 137                 amount = 128,
 138                 time = 1,
 139                 minpos = vector.subtract(pos, radius / 2),
 140                 maxpos = vector.add(pos, radius / 2),
 141                 minvel = {x=-20, y=-20, z=-20},
 142                 maxvel = {x=20,  y=20,  z=20},
 143                 minacc = vector.new(),
 144                 maxacc = vector.new(),
 145                 minexptime = 1,
 146                 maxexptime = 3,
 147                 minsize = 8,
 148                 maxsize = 16,
 149                 texture = "tnt_smoke.png",
 150         })
 151 end
 152
 153 local function burn(pos)
 154         local name = minetest.get_node(pos).name
 155         if name == "tnt:tnt" then
 156                 minetest.sound_play("tnt_ignite", {pos=pos})
 157                 minetest.set_node(pos, {name="tnt:tnt_burning"})
 158                 minetest.get_node_timer(pos):start(1)
 159         elseif name == "tnt:gunpowder" then
 160                 minetest.sound_play("tnt_gunpowder_burning", {pos=pos, gain=2})
 161                 minetest.set_node(pos, {name="tnt:gunpowder_burning"})
 162                 minetest.get_node_timer(pos):start(1)
 163         end
 164 end
 165
 166 local function explode(pos, radius)
 167         local pos = vector.round(pos)
 168         local vm = VoxelManip()
 169         local pr = PseudoRandom(os.time())
 170         local p1 = vector.subtract(pos, radius)
 171         local p2 = vector.add(pos, radius)
 172         local minp, maxp = vm:read_from_map(p1, p2)
 173         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 174         local data = vm:get_data()
 175
 176         local drops = {}
 177         local p = {}
 178
 179         local c_air = minetest.get_content_id("air")
 180
 181         for z = -radius, radius do
 182         for y = -radius, radius do
 183         local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
 184         for x = -radius, radius do
 185                 if (x * x) + (y * y) + (z * z) <=
 186                                 (radius * radius) + pr:next(-radius, radius) then
 187                         local cid = data[vi]
 188                         p.x = pos.x + x
 189                         p.y = pos.y + y
 190                         p.z = pos.z + z
 191                         if cid ~= c_air then
 192                                 destroy(drops, p, cid)
 193                         end
 194                 end
 195                 vi = vi + 1
 196         end
 197         end
 198         end
 199
 200         return drops
 201 end
 202
 203
 204 local function boom(pos)
 205         minetest.sound_play("tnt_explode", {pos=pos, gain=1.5, max_hear_distance=2*64})
 206         minetest.set_node(pos, {name="tnt:boom"})
 207         minetest.get_node_timer(pos):start(0.5)
 208
 209         local drops = explode(pos, radius)
 210         entity_physics(pos, radius)
 211         eject_drops(drops, pos, radius)
 212         add_effects(pos, radius)
 213 end
 214
 215 minetest.register_node("tnt:tnt", {
 216         description = "TNT",
 217         tiles = {"tnt_top.png", "tnt_bottom.png", "tnt_side.png"},
 218         is_ground_content = false,
 219         groups = {dig_immediate=2, mesecon=2},
 220         sounds = default.node_sound_wood_defaults(),
 221         on_punch = function(pos, node, puncher)
 222                 if puncher:get_wielded_item():get_name() == "default:torch" then
 223                         minetest.sound_play("tnt_ignite", {pos=pos})
 224                         minetest.set_node(pos, {name="tnt:tnt_burning"})
 225                         minetest.get_node_timer(pos):start(4)
 226                 end
 227         end,
 228         on_blast = function(pos, intensity)
 229                 burn(pos)
 230         end,
 231         mesecons = {effector = {action_on = boom}},
 232 })
 233
 234 minetest.register_node("tnt:tnt_burning", {
 235         tiles = {
 236                 {
 237                         name = "tnt_top_burning_animated.png",
 238                         animation = {
 239                                 type = "vertical_frames",
 240                                 aspect_w = 16,
 241                                 aspect_h = 16,
 242                                 length = 1,
 243                         }
 244                 },
 245                 "tnt_bottom.png", "tnt_side.png"},
 246         light_source = 5,
 247         drop = "",
 248         sounds = default.node_sound_wood_defaults(),
 249         on_timer = boom,
 250         -- unaffected by explosions
 251         on_blast = function() end,
 252 })
 253
 254 minetest.register_node("tnt:boom", {
 255         drawtype = "plantlike",
 256         tiles = {"tnt_boom.png"},
 257         light_source = default.LIGHT_MAX,
 258         walkable = false,
 259         drop = "",
 260         groups = {dig_immediate=3},
 261         on_timer = function(pos, elapsed)
 262                 minetest.remove_node(pos)
 263         end,
 264         -- unaffected by explosions
 265         on_blast = function() end,
 266 })
 267
 268 minetest.register_node("tnt:gunpowder", {
 269         description = "Gun Powder",
 270         drawtype = "raillike",
 271         paramtype = "light",
 272         is_ground_content = false,
 273         sunlight_propagates = true,
 274         walkable = false,
 275         tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
 276         inventory_image = "tnt_gunpowder_inventory.png",
 277         wield_image = "tnt_gunpowder_inventory.png",
 278         selection_box = {
 279                 type = "fixed",
 280                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 281         },
 282         groups = {dig_immediate=2,attached_node=1,connect_to_raillike=minetest.raillike_group("gunpowder")},
 283         sounds = default.node_sound_leaves_defaults(),
 284
 285         on_punch = function(pos, node, puncher)
 286                 if puncher:get_wielded_item():get_name() == "default:torch" then
 287                         burn(pos)
 288                 end
 289         end,
 290         on_blast = function(pos, intensity)
 291                 burn(pos)
 292         end,
 293 })
 294
 295 minetest.register_node("tnt:gunpowder_burning", {
 296         drawtype = "raillike",
 297         paramtype = "light",
 298         sunlight_propagates = true,
 299         walkable = false,
 300         light_source = 5,
 301         tiles = {{
 302                 name = "tnt_gunpowder_burning_straight_animated.png",
 303                 animation = {
 304                         type = "vertical_frames",
 305                         aspect_w = 16,
 306                         aspect_h = 16,
 307                         length = 1,
 308                 }
 309         },
 310         {
 311                 name = "tnt_gunpowder_burning_curved_animated.png",
 312                 animation = {
 313                         type = "vertical_frames",
 314                         aspect_w = 16,
 315                         aspect_h = 16,
 316                         length = 1,
 317                 }
 318         },
 319         {
 320                 name = "tnt_gunpowder_burning_t_junction_animated.png",
 321                 animation = {
 322                         type = "vertical_frames",
 323                         aspect_w = 16,
 324                         aspect_h = 16,
 325                         length = 1,
 326                 }
 327         },
 328         {
 329                 name = "tnt_gunpowder_burning_crossing_animated.png",
 330                 animation = {
 331                         type = "vertical_frames",
 332                         aspect_w = 16,
 333                         aspect_h = 16,
 334                         length = 1,
 335                 }
 336         }},
 337         selection_box = {
 338                 type = "fixed",
 339                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 340         },
 341         drop = "",
 342         groups = {dig_immediate=2,attached_node=1,connect_to_raillike=minetest.raillike_group("gunpowder")},
 343         sounds = default.node_sound_leaves_defaults(),
 344         on_timer = function(pos, elapsed)
 345                 for dx = -1, 1 do
 346                 for dz = -1, 1 do
 347                 for dy = -1, 1 do
 348                         if not (dx == 0 and dz == 0) then
 349                                 burn({
 350                                         x = pos.x + dx,
 351                                         y = pos.y + dy,
 352                                         z = pos.z + dz,
 353                                 })
 354                         end
 355                 end
 356                 end
 357                 end
 358                 minetest.remove_node(pos)
 359         end,
 360         -- unaffected by explosions
 361         on_blast = function() end,
 362 })
 363
 364 minetest.register_abm({
 365         nodenames = {"tnt:tnt", "tnt:gunpowder"},
 366         neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 367         interval = 1,
 368         chance = 1,
 369         action = burn,
 370 })
 371
 372 minetest.register_craft({
 373         output = "tnt:gunpowder",
 374         type = "shapeless",
 375         recipe = {"default:coal_lump", "default:gravel"}
 376 })
 377
 378 minetest.register_craft({
 379         output = "tnt:tnt",
 380         recipe = {
 381                 {"",           "group:wood",    ""},
 382                 {"group:wood", "tnt:gunpowder", "group:wood"},
 383                 {"",           "group:wood",    ""}
 384         }
 385 })
 386
 387 if minetest.setting_get("log_mods") then
 388         minetest.debug("[TNT] Loaded!")
 389 end
 390