91856fb3fb
But not too much. TNT is a bit underwhelming at the moment. We can make it a bit more interesting by ejecting not just one or two itemstacks, but a bunch of them. This code splits up the drops into separate itemstacks that are 2-5 items together, which results in generally roughly 10 itemstacks being ejected. Since now we have multiple ejecta, it makes sense to tune the ejecta velocities a bit better to get the appearance of an actual explosion better. The items will not all start with the same vertical velocity, since that would look like fireworks. Instead we give them all a different vertical speed.
402 lines
9.6 KiB
Lua
402 lines
9.6 KiB
Lua
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-- Default to enabled in singleplayer and disabled in multiplayer
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local singleplayer = minetest.is_singleplayer()
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local setting = minetest.setting_getbool("enable_tnt")
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if (not singleplayer and setting ~= true) or
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(singleplayer and setting == false) then
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return
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end
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-- loss probabilities array (one in X will be lost)
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local loss_prob = {}
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loss_prob["default:cobble"] = 3
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loss_prob["default:dirt"] = 4
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local radius = tonumber(minetest.setting_get("tnt_radius") or 3)
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-- Fill a list with data for content IDs, after all nodes are registered
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local cid_data = {}
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minetest.after(0, function()
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for name, def in pairs(minetest.registered_nodes) do
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cid_data[minetest.get_content_id(name)] = {
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name = name,
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drops = def.drops,
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flammable = def.groups.flammable,
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on_blast = def.on_blast,
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}
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end
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end)
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local function rand_pos(center, pos, radius)
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local def
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local reg_nodes = minetest.registered_nodes
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local i = 0
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repeat
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-- Give up and use the center if this takes too long
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if i > 4 then
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pos.x, pos.z = center.x, center.z
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break
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end
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pos.x = center.x + math.random(-radius, radius)
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pos.z = center.z + math.random(-radius, radius)
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def = reg_nodes[minetest.get_node(pos).name]
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i = i + 1
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until def and not def.walkable
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end
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local function eject_drops(drops, pos, radius)
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local drop_pos = vector.new(pos)
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for _, item in pairs(drops) do
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local count = item:get_count()
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while count > 0 do
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local take = math.min(math.random(2,5),
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item:get_count(),
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item:get_stack_max())
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rand_pos(pos, drop_pos, radius)
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local obj = minetest.add_item(drop_pos, item:get_name() .. " " .. take)
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if obj then
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obj:get_luaentity().collect = true
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obj:setacceleration({x=0, y=-10, z=0})
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obj:setvelocity({x=math.random(-3, 3),
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y=math.random(0, 10),
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z=math.random(-3, 3)})
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end
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count = count - take
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end
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end
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end
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local function add_drop(drops, item)
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item = ItemStack(item)
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local name = item:get_name()
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if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
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return
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end
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local drop = drops[name]
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if drop == nil then
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drops[name] = item
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else
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drop:set_count(drop:get_count() + item:get_count())
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end
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end
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local fire_node = {name="fire:basic_flame"}
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local function destroy(drops, pos, cid)
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if minetest.is_protected(pos, "") then
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return
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end
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local def = cid_data[cid]
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if def and def.on_blast then
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local node_drops = def.on_blast(vector.new(pos), 1)
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if node_drops then
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for _, item in ipairs(node_drops) do
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add_drop(drops, item)
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end
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end
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return
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end
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if def and def.flammable then
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minetest.set_node(pos, fire_node)
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else
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minetest.remove_node(pos)
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if def then
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local node_drops = minetest.get_node_drops(def.name, "")
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for _, item in ipairs(node_drops) do
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add_drop(drops, item)
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end
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end
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end
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end
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local function calc_velocity(pos1, pos2, old_vel, power)
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local vel = vector.direction(pos1, pos2)
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vel = vector.normalize(vel)
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vel = vector.multiply(vel, power)
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-- Divide by distance
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local dist = vector.distance(pos1, pos2)
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dist = math.max(dist, 1)
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vel = vector.divide(vel, dist)
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-- Add old velocity
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vel = vector.add(vel, old_vel)
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return vel
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end
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local function entity_physics(pos, radius)
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-- Make the damage radius larger than the destruction radius
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radius = radius * 2
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local objs = minetest.get_objects_inside_radius(pos, radius)
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for _, obj in pairs(objs) do
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local obj_pos = obj:getpos()
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local obj_vel = obj:getvelocity()
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local dist = math.max(1, vector.distance(pos, obj_pos))
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if obj_vel ~= nil then
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obj:setvelocity(calc_velocity(pos, obj_pos,
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obj_vel, radius * 10))
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end
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local damage = (4 / dist) * radius
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obj:set_hp(obj:get_hp() - damage)
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end
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end
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local function add_effects(pos, radius)
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minetest.add_particlespawner({
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amount = 128,
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time = 1,
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minpos = vector.subtract(pos, radius / 2),
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maxpos = vector.add(pos, radius / 2),
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minvel = {x=-20, y=-20, z=-20},
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maxvel = {x=20, y=20, z=20},
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minacc = vector.new(),
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maxacc = vector.new(),
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minexptime = 1,
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maxexptime = 3,
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minsize = 8,
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maxsize = 16,
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texture = "tnt_smoke.png",
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})
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end
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local function burn(pos)
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local name = minetest.get_node(pos).name
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if name == "tnt:tnt" then
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minetest.sound_play("tnt_ignite", {pos=pos})
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minetest.set_node(pos, {name="tnt:tnt_burning"})
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minetest.get_node_timer(pos):start(1)
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elseif name == "tnt:gunpowder" then
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minetest.sound_play("tnt_gunpowder_burning", {pos=pos, gain=2})
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minetest.set_node(pos, {name="tnt:gunpowder_burning"})
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minetest.get_node_timer(pos):start(1)
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end
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end
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local function explode(pos, radius)
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local pos = vector.round(pos)
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local vm = VoxelManip()
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local pr = PseudoRandom(os.time())
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local p1 = vector.subtract(pos, radius)
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local p2 = vector.add(pos, radius)
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local minp, maxp = vm:read_from_map(p1, p2)
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local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
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local data = vm:get_data()
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local drops = {}
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local p = {}
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local c_air = minetest.get_content_id("air")
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for z = -radius, radius do
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for y = -radius, radius do
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local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
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for x = -radius, radius do
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if (x * x) + (y * y) + (z * z) <=
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(radius * radius) + pr:next(-radius, radius) then
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local cid = data[vi]
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p.x = pos.x + x
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p.y = pos.y + y
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p.z = pos.z + z
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if cid ~= c_air then
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destroy(drops, p, cid)
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end
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end
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vi = vi + 1
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end
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end
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end
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return drops
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end
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local function boom(pos)
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minetest.sound_play("tnt_explode", {pos=pos, gain=1.5, max_hear_distance=2*64})
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minetest.set_node(pos, {name="tnt:boom"})
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minetest.get_node_timer(pos):start(0.5)
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local drops = explode(pos, radius)
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entity_physics(pos, radius)
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eject_drops(drops, pos, radius)
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add_effects(pos, radius)
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end
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minetest.register_node("tnt:tnt", {
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description = "TNT",
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tiles = {"tnt_top.png", "tnt_bottom.png", "tnt_side.png"},
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is_ground_content = false,
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groups = {dig_immediate=2, mesecon=2},
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sounds = default.node_sound_wood_defaults(),
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on_punch = function(pos, node, puncher)
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if puncher:get_wielded_item():get_name() == "default:torch" then
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minetest.sound_play("tnt_ignite", {pos=pos})
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minetest.set_node(pos, {name="tnt:tnt_burning"})
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end
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end,
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on_blast = function(pos, intensity)
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burn(pos)
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end,
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mesecons = {effector = {action_on = boom}},
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})
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minetest.register_node("tnt:tnt_burning", {
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tiles = {
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{
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name = "tnt_top_burning_animated.png",
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animation = {
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type = "vertical_frames",
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aspect_w = 16,
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aspect_h = 16,
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length = 1,
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}
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},
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"tnt_bottom.png", "tnt_side.png"},
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light_source = 5,
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drop = "",
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sounds = default.node_sound_wood_defaults(),
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on_construct = function(pos)
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minetest.get_node_timer(pos):start(4)
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end,
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on_timer = boom,
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-- unaffected by explosions
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on_blast = function() end,
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})
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minetest.register_node("tnt:boom", {
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drawtype = "plantlike",
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tiles = {"tnt_boom.png"},
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light_source = default.LIGHT_MAX,
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walkable = false,
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drop = "",
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groups = {dig_immediate=3},
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on_timer = function(pos, elapsed)
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minetest.remove_node(pos)
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end,
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-- unaffected by explosions
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on_blast = function() end,
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})
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minetest.register_node("tnt:gunpowder", {
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description = "Gun Powder",
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drawtype = "raillike",
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paramtype = "light",
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is_ground_content = false,
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sunlight_propagates = true,
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walkable = false,
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tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
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inventory_image = "tnt_gunpowder_inventory.png",
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wield_image = "tnt_gunpowder_inventory.png",
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selection_box = {
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type = "fixed",
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fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
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},
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groups = {dig_immediate=2,attached_node=1,connect_to_raillike=minetest.raillike_group("gunpowder")},
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sounds = default.node_sound_leaves_defaults(),
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on_punch = function(pos, node, puncher)
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if puncher:get_wielded_item():get_name() == "default:torch" then
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burn(pos)
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end
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end,
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on_blast = function(pos, intensity)
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burn(pos)
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end,
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})
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minetest.register_node("tnt:gunpowder_burning", {
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drawtype = "raillike",
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paramtype = "light",
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sunlight_propagates = true,
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walkable = false,
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light_source = 5,
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tiles = {{
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name = "tnt_gunpowder_burning_straight_animated.png",
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animation = {
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type = "vertical_frames",
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aspect_w = 16,
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aspect_h = 16,
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length = 1,
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}
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},
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{
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name = "tnt_gunpowder_burning_curved_animated.png",
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animation = {
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type = "vertical_frames",
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aspect_w = 16,
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aspect_h = 16,
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length = 1,
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}
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},
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{
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name = "tnt_gunpowder_burning_t_junction_animated.png",
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animation = {
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type = "vertical_frames",
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aspect_w = 16,
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aspect_h = 16,
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length = 1,
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}
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},
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{
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name = "tnt_gunpowder_burning_crossing_animated.png",
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animation = {
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type = "vertical_frames",
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aspect_w = 16,
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aspect_h = 16,
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length = 1,
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}
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}},
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selection_box = {
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type = "fixed",
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fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
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},
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drop = "",
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groups = {dig_immediate=2,attached_node=1,connect_to_raillike=minetest.raillike_group("gunpowder")},
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sounds = default.node_sound_leaves_defaults(),
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on_timer = function(pos, elapsed)
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for dx = -1, 1 do
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for dz = -1, 1 do
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for dy = -1, 1 do
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if not (dx == 0 and dz == 0) then
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burn({
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x = pos.x + dx,
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y = pos.y + dy,
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z = pos.z + dz,
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})
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end
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end
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end
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end
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minetest.remove_node(pos)
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end,
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-- unaffected by explosions
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on_blast = function() end,
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})
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minetest.register_abm({
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nodenames = {"tnt:tnt", "tnt:gunpowder"},
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neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
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interval = 4,
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chance = 1,
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action = burn,
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})
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minetest.register_craft({
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output = "tnt:gunpowder",
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type = "shapeless",
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recipe = {"default:coal_lump", "default:gravel"}
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})
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minetest.register_craft({
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output = "tnt:tnt",
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recipe = {
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{"", "group:wood", ""},
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{"group:wood", "tnt:gunpowder", "group:wood"},
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{"", "group:wood", ""}
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}
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})
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