Introduce Landmines (#1001)

* Add landmine

* Add landmine texture

* Update ctf_traps.lua

* Add landmine recipe

* enable landmine classes

* Enable landmine nadefight

* Edit landmine classes

* Update dependencies

* reduce min_y level

* Update ctf_traps.lua

make landmines walkable, remove y limits, prevent friendly fire and triggering, do not save player's team, add damage group, increase damage

* Add landmine damage_group texture

* Update ctf_traps.lua

* Fix trigger team detection

* Save placer team

* complete landmines

* make landmines working fine

* optimize texture image of landmine

* wrong comma

* final corrections

* fix some small correction

* clear landmines table on new match

* make luacheck happy

* refactor the code, iterate over players positions instead of landmines

* make luacheck happy

* correct maps submodule commit

* fix errors

* fixed kill log texture error

* Update crafting.lua

---------

Co-authored-by: Farooq Karimi Zadeh <[email protected]>
Co-authored-by: LoneWolfHT <[email protected]>

mods/ctf/ctf_landmine/init.lua

@@ -0,0 +1,202 @@
+local landmines = {
+	-- core.hash_node_position(pos) -> true/false
+	-- like landmines[core.hash_node_position(pos)] = true
+}
+
+local number_of_landmines = 0
+
+local add_landmine = function(pos)
+	landmines[core.hash_node_position(pos)] = true
+	number_of_landmines = number_of_landmines + 1
+end
+
+local clear_landmines = function()
+	landmines = {}
+	number_of_landmines = 0
+end
+
+local remove_landmine = function(pos)
+	landmines[core.hash_node_position(pos)] = false
+	number_of_landmines = number_of_landmines - 1
+end
+
+local landmine_globalstep_counter = 0.0
+local LANDMINE_COUNTER_THRESHOLD = 0.025
+
+local function is_self_landmine(object_ref, pos)
+	local meta = core.get_meta(pos)
+	local team = meta:get_string("pteam")
+	local placer = meta:get_string("placer")
+	local pname = object_ref:get_player_name()
+	if pname == "" then
+		return nil -- the object ref is not a player
+	end
+	if pname == placer then
+		return true -- it's self landmine
+	end
+	if ctf_teams.get(object_ref) == team then
+		return true -- it's self landmine
+	end
+
+	return false -- it's someone else's landmine
+end
+
+local function landmine_explode(pos)
+	local near_objs = core.get_objects_inside_radius(pos, 3)
+	local meta = core.get_meta(pos)
+	local placer = meta:get_string("placer")
+	local placerobj = placer and core.get_player_by_name(placer)
+
+	core.add_particlespawner({
+		amount = 20,
+		time = 0.5,
+		minpos = vector.subtract(pos, 3),
+		maxpos = vector.add(pos, 3),
+		minvel = {x = 0, y = 5, z = 0},
+		maxvel = {x = 0, y = 7, z = 0},
+		minacc = {x = 0, y = 1, z = 0},
+		maxacc = {x = 0, y = 1, z = 0},
+		minexptime = 0.3,
+		maxexptime = 0.6,
+		minsize = 7,
+		maxsize = 10,
+		collisiondetection = true,
+		collision_removal = false,
+		vertical = false,
+		texture = "grenades_smoke.png",
+	})
+
+	core.add_particle({
+		pos = pos,
+		velocity = {x=0, y=0, z=0},
+		acceleration = {x=0, y=0, z=0},
+		expirationtime = 0.3,
+		size = 15,
+		collisiondetection = false,
+		collision_removal = false,
+		object_collision = false,
+		vertical = false,
+		texture = "grenades_boom.png",
+		glow = 10
+	})
+
+	core.sound_play("grenades_explode", {
+		pos = pos,
+		gain = 1.0,
+		max_hear_distance = 64,
+	})
+
+	for _, obj in pairs(near_objs) do
+		if is_self_landmine(obj, pos) == false then
+			if placerobj then
+				obj:punch(
+					placerobj,
+					1,
+					{
+						damage_groups = {
+							fleshy = 15,
+							landmine = 1
+						}
+					}
+				)
+			else
+				local chp = obj:get_hp()
+				obj:set_hp(chp - 15)
+			end
+		end
+	end
+	core.remove_node(pos)
+	remove_landmine(pos)
+end
+
+core.register_node("ctf_landmine:landmine", {
+	description = "Landmine",
+	drawtype = "nodebox",
+	tiles = {
+		"ctf_landmine_landmine.png",
+		"ctf_landmine_landmine.png^[transformFY"
+	},
+	inventory_image = "ctf_landmine_landmine.png",
+	paramtype = "light",
+	sunlight_propagates = true,
+	walkable = true,
+	groups = {cracky=1, level=2},
+	node_box = {
+		type = "fixed",
+		fixed = {-0.5, -0.5, -0.5, 0.5, -0.4, 0.5},
+	},
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.5, -0.5, -0.5, 0.5, -0.4, 0.5},
+	},
+	after_place_node = function(pos, placer, itemstack, pointed_thing)
+		local meta = core.get_meta(pos)
+		local name = placer:get_player_name()
+		local pteam = ctf_teams.get(placer)
+
+		meta:set_string("placer", name)
+		meta:set_string("pteam", pteam)
+		add_landmine(pos)
+	end,
+	on_punch = function(pos, _node, puncher, pointed_thing)
+		if not is_self_landmine(puncher, pos) then
+			landmine_explode(pos)
+		end
+	end
+})
+
+
+
+
+core.register_globalstep(function(dtime)
+	landmine_globalstep_counter = landmine_globalstep_counter + dtime
+	if landmine_globalstep_counter < LANDMINE_COUNTER_THRESHOLD then
+		return
+	end
+	landmine_globalstep_counter = 0.0
+	if number_of_landmines == 0 then
+		return
+	end
+	local start_time = core.get_gametime()
+	local players_n = #core.get_connected_players()
+	local landmines_n = number_of_landmines
+	for _idx, obj in ipairs(core.get_connected_players()) do
+		local pos = {
+			x = math.ceil(obj:get_pos().x),
+			y = math.ceil(obj:get_pos().y),
+			z = math.ceil(obj:get_pos().z)
+		}
+		local positions_to_check = {
+			pos,
+			vector.add(pos, { x = 0, y = 0, z = 1}),
+			vector.add(pos, { x = 1, y = 0, z = 0}),
+			vector.add(pos, { x = 0, y = 0, z = -1}),
+			vector.add(pos, { x = -1, y = 0, z = 0}),
+			vector.add(pos, { x = 0, y = 1, z = 0}),
+		}
+		local landmine_positions = {}
+		for _idx2, pos2 in ipairs(positions_to_check) do
+			if landmines[core.hash_node_position(pos2)] then
+				table.insert(landmine_positions, pos2)
+			end
+		end
+		-- explode them!
+		for _idx2, pos2 in ipairs(landmine_positions) do
+			if not is_self_landmine(obj, pos2) then
+				landmine_explode(pos2)
+			end
+		end
+	end
+	core.debug(
+		string.format(
+			"[CTF Landmine] Used %f of server time for %d landmines and %d players",
+			core.get_gametime() - start_time,
+			landmines_n,
+			players_n
+		)
+	)
+end)
+
+ctf_api.register_on_match_end(function()
+	clear_landmines()
+end)

mods/ctf/ctf_landmine/mod.conf

@@ -0,0 +1,2 @@
+name = ctf_landmine
+depends = ctf_teams, grenades, default, ctf_api

mods/ctf/ctf_modebase/crafting.lua

@@ -173,3 +173,9 @@ crafting.register_recipe({
 	items  = { "default:cobble 6", "default:steel_ingot" },
 	always_known = false,
 })
+
+crafting.register_recipe({
+	output = "ctf_map:landmine",
+	items  = { "default:steel_ingot 4", "grenades:frag" },
+	always_known = false,
+})

mods/ctf/ctf_modebase/features.lua

@@ -206,6 +206,7 @@ local damage_group_textures = {
 	knockback_grenade = "ctf_mode_nade_fight_knockback_grenade.png",
 	black_hole_grenade = "ctf_mode_nade_fight_black_hole_grenade.png",
 	damage_cobble = "ctf_map_damage_cobble.png",
+	landmine = "ctf_landmine_landmine.png",
 }
 
 local function get_weapon_image(hitter, tool_capabilities)

mods/ctf/ctf_modes/ctf_mode_classes/init.lua

@@ -57,6 +57,7 @@ ctf_modebase.register_mode("classes", {
 		["ctf_map:spike"            ] = {min_count = 1, max_count =  5, max_stacks = 2, rarity = 0.2},
 		["ctf_map:damage_cobble"    ] = {min_count = 5, max_count = 20, max_stacks = 2, rarity = 0.2},
 		["ctf_map:reinforced_cobble"] = {min_count = 5, max_count = 25, max_stacks = 2, rarity = 0.2},
+		["ctf_map:landmine"         ] = {min_count = 1, max_count =  5, max_stacks = 1, rarity = 0.2},
 
 		["ctf_ranged:ammo"    ] = {min_count = 3, max_count = 10, rarity = 0.3  , max_stacks = 2},
 		["ctf_healing:medkit" ] = {                               rarity = 0.08 , max_stacks = 2},
@@ -67,7 +68,7 @@ ctf_modebase.register_mode("classes", {
 	},
 	crafts = {
 		"ctf_ranged:ammo", "default:axe_mese", "default:axe_diamond", "default:shovel_mese", "default:shovel_diamond",
-		"ctf_map:damage_cobble", "ctf_map:spike", "ctf_map:reinforced_cobble 2",
+		"ctf_map:damage_cobble", "ctf_map:spike", "ctf_map:reinforced_cobble 2", "ctf_map:landmine",
 	},
 	physics = {sneak_glitch = true, new_move = true},
 	blacklisted_nodes = {"default:apple"},

mods/ctf/ctf_modes/ctf_mode_nade_fight/init.lua

@@ -39,6 +39,7 @@ ctf_modebase.register_mode("nade_fight", {
 		["ctf_map:spike"            ] = {min_count = 1, max_count =  5, max_stacks = 3, rarity = 0.2},
 		["ctf_map:damage_cobble"    ] = {min_count = 5, max_count = 20, max_stacks = 2, rarity = 0.2},
 		["ctf_map:reinforced_cobble"] = {min_count = 5, max_count = 25, max_stacks = 2, rarity = 0.2},
+		["ctf_map:landmine"         ] = {min_count = 1, max_count = 3, max_stacks = 1, rarity = 0.2},
 
 		["ctf_ranged:ammo"     ] = {min_count = 3, max_count = 10, rarity = 0.3  , max_stacks = 2},
 		["ctf_healing:medkit"  ] = {                               rarity = 0.1  , max_stacks = 2},
@@ -51,6 +52,7 @@ ctf_modebase.register_mode("nade_fight", {
 		"ctf_map:damage_cobble",
 		"ctf_map:spike",
 		"ctf_map:reinforced_cobble 2",
+		"ctf_map:landmine",
 	},
 	physics = {sneak_glitch = true, new_move = true},
 	blacklisted_nodes = {"default:apple"},