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breaker.lua

@@ -138,9 +138,9 @@ local function can_break_node (pos, breakpos)
 			if node_def then
 				-- try tool first
 				local tool = get_tool (pos)
+				local dig_params = nil
 
 				if tool then
-					local dig_params = nil
 					local tool_def = minetest.registered_items[tool:get_name ()]
 
 					if tool_def then
@@ -356,7 +356,7 @@ local function after_place_node_locked (pos, placer, itemstack, pointed_thing)
 		local meta = minetest.get_meta (pos)
 
 		meta:set_string ("owner", placer:get_player_name ())
-		meta:set_string ("infotext", "Dropper (owned by "..placer:get_player_name ()..")")
+		meta:set_string ("infotext", "Breaker (owned by "..placer:get_player_name ()..")")
 	end
 
 	-- If return true no item is taken from itemstack

cannon_shell.lua

@@ -0,0 +1,293 @@
+local utils = ...
+local S = utils.S
+
+
+
+--[[
+on_step info
+
+info.touching_ground = bool
+info.standing_on_object = bool
+info.collides = bool
+
+
+info.collisions[n].type = "node"
+info.collisions[n].node_pos = vector
+info.collisions[n].old_velocity = vector
+info.collisions[n].now_velocity = vector
+info.collisions[n].axis = "x" | "y" | "z" - axis hit
+
+or
+
+info.collisions[n].type = "object"
+info.collisions[n].object = userdata
+info.collisions[n].old_velocity = vector
+info.collisions[n].now_velocity = vector
+info.collisions[n].axis = "x" | "y" | "z" - axis hit
+]]
+
+
+
+local function get_adjacent_node (collision_info, spawn_pos)
+	if vector.equals (collision_info.node_pos, spawn_pos) then
+		return collision_info.node_pos
+	end
+
+	local adj = { x = 0, y = 0, z = 0 }
+
+	if collision_info.axis == "x" then
+		adj.x = (collision_info.old_velocity.x > 0 and -1) or 1
+	elseif collision_info.axis == "y" then
+		adj.y = (collision_info.old_velocity.y > 0 and -1) or 1
+	elseif collision_info.axis == "z" then
+		adj.z = (collision_info.old_velocity.z > 0 and -1) or 1
+	end
+
+	local pos = vector.new (collision_info.node_pos)
+	local node = utils.get_far_node (pos)
+	local def = minetest.registered_nodes[node and node.name or nil]
+
+	while (node and node.name ~= "air") and (def and not def.buildable_to) do
+		local next_pos = vector.add (pos, adj)
+
+		if vector.equals (next_pos, spawn_pos) then
+			return pos
+		end
+
+		pos = next_pos
+		node = utils.get_far_node (pos)
+		def = minetest.registered_nodes[node and node.name or nil]
+	end
+
+	return pos
+end
+
+
+
+local function register_shell (name, description, texture, inventory_image,
+										 stack_max, shell_speed, explode_func)
+
+	minetest.register_entity (name.."_entity", {
+		initial_properties = {
+			physical = true,
+			collide_with_objects = true,
+			collisionbox = { -0.25, -0.125, -0.25, 0.25, 0.125, 0.25 },
+			pointable = false,
+			visual_size = { x = 0.7, y = 0.7, z = 0.7 },
+			visual = "mesh",
+			mesh = "lwcomponents_shell.obj",
+			textures = { texture },
+			use_texture_alpha = false,
+			is_visible = true,
+			makes_footstep_sound = false,
+			automatic_face_movement_dir = false,
+			automatic_face_movement_max_rotation_per_sec = false,
+			automatic_rotate = 0,
+			backface_culling = true,
+			damage_texture_modifier = "",
+			glow = 0,
+			static_save = false,
+			shaded = true,
+			show_on_minimap = false,
+		},
+
+		on_activate = function (self, staticdata, dtime_s)
+			if not self.spawn_pos then
+				self.spawn_pos = vector.new (self.object:get_pos ())
+			end
+
+			if not self.time_lived then
+				self.time_lived = 0
+			end
+
+			if not self.shell_speed then
+				self.shell_speed = shell_speed
+			end
+
+			self.staticdata = staticdata
+		end,
+
+		get_staticdata = function (self)
+			return self.staticdata
+		end,
+
+		on_step = function (self, dtime, info)
+			local explode_pos = nil
+
+			self.object:set_rotation (vector.dir_to_rotation (self.object:get_velocity ()))
+
+			if self.time_lived then
+				self.time_lived = self.time_lived + dtime
+
+				if self.time_lived > self.shell_speed then
+					self.object:remove ()
+
+					return
+				end
+			end
+
+			if info.collides then
+				--For each collision that was found in reverse order
+				for i = #info.collisions, 1, -1 do
+					local c = info.collisions[i]
+
+					if c.type == "node" then
+						local node = utils.get_far_node (c.node_pos)
+
+						if node and node.name ~= "air" then
+							local def = minetest.registered_nodes[node.name]
+
+							if def and def.walkable then
+								-- adjacent for explosion
+								explode_pos = get_adjacent_node (c, self.spawn_pos)
+
+--minetest.log ("action", "Shell on node "..node.name.." at "..minetest.pos_to_string (explode_pos)..
+							--" node at "..minetest.pos_to_string (c.node_pos))
+
+								break
+							end
+						end
+
+						if not explode_pos then
+							self.object:set_velocity (c.old_velocity)
+						end
+
+					elseif c.type == "object" then
+						-- explode at this pos
+						if c.object:get_armor_groups ().immortal then
+							self.object:set_velocity (c.old_velocity)
+						else
+							explode_pos = vector.new (c.object:get_pos ())
+
+--minetest.log ("action", "Shell on entity "..c.object:get_luaentity ().name.." at "..minetest.pos_to_string (explode_pos))
+
+							break
+						end
+					end
+				end
+			end
+
+			if explode_pos then
+				self.object:remove ()
+
+				explode_func (explode_pos)
+			end
+		end,
+
+		on_punch = function (self, puncher, time_from_last_punch, tool_capabilities, dir)
+			return true
+		end,
+	})
+
+	minetest.register_craftitem (name, {
+		description = description,
+		short_description = description,
+		groups = { },
+		inventory_image = inventory_image,
+		wield_image = inventory_image,
+		stack_max = stack_max,
+	})
+
+
+	lwcomponents.register_spawner (name,
+	function (spawn_pos, itemstack, owner, spawner_pos, spawner_dir, force)
+		if not itemstack:is_empty() then
+			local def = minetest.registered_entities[name.."_entity"]
+
+			if def then
+				local obj = minetest.add_entity (spawn_pos, name.."_entity")
+
+				if obj then
+					obj:set_armor_groups ({ immortal = 1 })
+					obj:set_acceleration ({ x = 0, y = -9.81, z = 0 })
+					obj:set_rotation (vector.dir_to_rotation (vector.multiply (spawner_dir, shell_speed)))
+					obj:set_velocity (vector.multiply (spawner_dir, shell_speed))
+
+					local luaent = obj:get_luaentity ()
+
+					if luaent then
+						luaent.spawn_pos = { x = spawn_pos.x, y = spawn_pos.y, z = spawn_pos.z }
+						luaent.time_lived = 0
+						luaent.shell_speed = shell_speed
+					end
+
+					return obj, false
+				end
+			end
+		end
+
+		return nil, false
+	end)
+end
+
+
+register_shell ("lwcomponents:cannon_shell",
+	S("Shell"),
+	"lwcannon_shell.png",
+	"lwcannon_shell_item.png",
+	99,
+	25,
+	function (pos)
+		utils.boom (pos,
+						2, -- node_radius
+						70, -- node_chance in 100
+						2, -- fire_radius
+						5, -- fire_chance in 100
+						4, -- entity_radius
+						20, -- entity_damage
+						false, -- disable_drops
+						nil, -- node_filter
+						false, -- burn_all
+						nil) -- sound
+	end)
+
+
+register_shell ("lwcomponents:cannon_soft_shell",
+	S("Soft Shell"),
+	"lwcannon_soft_shell.png",
+	"lwcannon_soft_shell_item.png",
+	99,
+	25,
+	function (pos)
+		utils.boom (pos,
+						 2, -- node_radius
+						 50, -- node_chance in 100
+						 2, -- fire_radius
+						 5, -- fire_chance in 100
+						 4, -- entity_radius
+						 20, -- entity_damage
+						 false, -- disable_drops
+						 {
+							 buildable_to = true,
+							 buildable_to_undefined = false,
+						 }, -- node_filter
+						 false, -- burn_all
+						 nil) -- sound
+	end)
+
+
+if minetest.global_exists ("fire") then
+register_shell ("lwcomponents:cannon_fire_shell",
+	S("Fire Shell"),
+	"lwcannon_fire_shell.png",
+	"lwcannon_fire_shell_item.png",
+	99,
+	25,
+	function (pos)
+		utils.boom (pos,
+						2, -- node_radius
+						0, -- node_chance in 100
+						2, -- fire_radius
+						70, -- fire_chance in 100
+						4, -- entity_radius
+						20, -- entity_damage
+						false, -- disable_drops
+						nil, -- node_filter
+						true, -- burn_all
+						nil) -- sound
+	end)
+end
+
+
+
+--

change.log

@@ -54,3 +54,23 @@ v0.1.8
 	must now set velocity, can use force parameter.
 *	Removed spawning from this mod. Created lwcomponents_spawners to
 	register spawers.
+
+
+v0.1.9
+*	Fixed infotext on various nodes.
+
+
+v0.1.10
+*	Added cannons.
+
+
+v0.1.11
+*	Fix to breakers (?).
+*	Added position aiming to cannons.
+
+
+v0.1.12
+*	Added sensitivity option for game controller in cannons.
+*	Added cannon shells.
+*	Fixed bug in utils.is_creative.
+*	Increased cannon pitch to -20 to 70.

conduit.lua

@@ -396,7 +396,7 @@ local function after_place_node_locked (pos, placer, itemstack, pointed_thing)
 		local meta = minetest.get_meta (pos)
 
 		meta:set_string ("owner", placer:get_player_name ())
-		meta:set_string ("infotext", "Dropper (owned by "..placer:get_player_name ()..")")
+		meta:set_string ("infotext", "Conduit (owned by "..placer:get_player_name ()..")")
 	end
 
 	-- If return true no item is taken from itemstack

crafting.lua

@@ -3,6 +3,56 @@ local S = utils.S
 
 
 
+minetest.register_craft( {
+	output = "lwcomponents:cannon",
+	recipe = {
+		{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" },
+		{ "default:chest", "default:wood", "" },
+		{ "default:copper_ingot", "default:stone", "" },
+	},
+})
+
+
+minetest.register_craft( {
+	output = "lwcomponents:cannon_locked",
+	recipe = {
+		{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" },
+		{ "default:chest_locked", "default:wood", "" },
+		{ "default:copper_ingot", "default:stone", "" },
+	},
+})
+
+
+minetest.register_craft( {
+	output = "lwcomponents:cannon_shell 10",
+	recipe = {
+		{ "default:steel_ingot", "default:steel_ingot" },
+		{ "", "default:coalblock" },
+	},
+})
+
+
+minetest.register_craft( {
+	output = "lwcomponents:cannon_soft_shell 10",
+	recipe = {
+		{ "default:steel_ingot", "default:steel_ingot" },
+		{ "default:copper_lump", "default:coalblock" },
+	},
+})
+
+
+if minetest.global_exists ("fire") then
+minetest.register_craft( {
+	output = "lwcomponents:cannon_fire_shell 10",
+	recipe = {
+		{ "default:steel_ingot", "default:steel_ingot" },
+		{ "default:iron_lump", "default:coalblock" },
+	},
+})
+end
+
+
+
 if utils.digilines_supported or utils.mesecon_supported then
 
 minetest.register_craft( {

dispenser.lua

@@ -158,11 +158,12 @@ local function dispense_item (pos, node, slot)
 						if not obj then
 							obj = minetest.add_item (spawn_pos, item)
 
-							obj:set_velocity (dispense_velocity (node))
+							if obj then
+								obj:set_velocity (dispense_velocity (node))
+							end
 						end
 
 						if obj then
-
 							stack:set_count (stack:get_count () - 1)
 							inv:set_stack ("main", slot, stack)
 

docs/cannon.txt

@@ -0,0 +1,103 @@
+Cannon
+------
+This item is available without digilines or mesecons as it can be used
+manually.
+
+Contains a single inventory slot and shoots an item on command.
+If the hopper mod is loaded, will take items from the top and sides, and
+release them from the bottom.
+
+Cannon rotation range:
+side to side - +/-60 degrees (- = left, + = right)
+down to up: -20 to 70 degrees (- = down, + = up)
+
+To spawn entities from cannons include the lwcomponents_spawners mod.
+
+Only the owner can dig or access the form of the locked version.
+
+UI
+
+Channel - digilines channel of cannon.
+Hide - hides the form so the cannon can be used manually, double right click
+		 any other face besides the rear to bring up the form.
+Controller - digistuff game controller digilines channel.
+Sensitive - if checked game controller movements have a x3 sensitivity.
+Top 1 slot inventory - storage of items to shoot.
+Bottom 32 slot inventory - player's inventory.
+
+Manual control
+Place some items in the single slot, and click the Hide button. On the
+rear panel their are 4 gray buttons. Right clicking them turns the barrel
+in that direction 10 degrees. aux + right click turns 1 degree. Clicking
+the red button fires an item. To bring up the form again double right click
+any other face besides the rear.
+
+Digistuff game controller
+Connect a game controller to the cannon with digilines cable. Enter the
+game controller's channel in the Controller field of the cannon's form
+(click Set). Your turning movements turn the cannon's barrel in the
+direction the cannon is facing. If Sensitive is checked the movements
+have an increased sensitivity (x3) to try and keep the target in your view,
+otherwise x1. Punching shoots an item. The game controller updates every
+0.2 seconds, so a quick punch may not register. A locked cannon can only
+be controlled by it's owner with a game controller.
+
+Mesecons
+	Shoots an item when power is turned on.
+
+Digilines messages
+
+"pitch <n>"
+	Sets the pitch of the barrel. n should be between -20 to 70, and will
+	be clipped to this range.
+	eg. "pitch 22"
+
+"rotation <n>"
+	Sets the rotation of the barrel. n should be between -60 to 60, and will
+	be clipped to this range.
+	eg. "rotation 45"
+
+table - aim position
+{
+	action = "aim",
+	aim = { x, y, z }
+}
+	x is the horizontal left (negative) to right. 0 is straight ahead.
+	y is the vertical down (negative) to up. 0 is straight ahead.
+	z is the depth. Must be > 0 or ignored. 1 is the position directly in
+	front of the cannon.
+	*	The cannon barrel's height is 0.65 above the cannon's placed position.
+		When aiming for height, if the cannon's base height is taken as -0.5,
+		and consider height from there. This allows for the barrel height
+		and a little drop in the projectile at close range.
+
+"fire"
+	Shoots an item.
+
+*	Note: turning the barrel is animated and takes 0.1 seconds per 10
+			degrees of movement. A fire command while moving is ignored.
+
+
+Three shells are provided for cannons.
+
+Shell
+This shell has a 70% chance of destroying a node within a radius of 2 from
+the impact, a 5% chance a flammable node will be set on fire within a
+radius of 2 (if fire is installed), and damages players and entities within
+a radius of 4 with a maximum of 20 damage points.
+
+
+Soft Shell
+This shell has a 50% chance of destroying only soft (buildable_to) nodes,
+such as grass, within a radius of 2 from the impact, a 5% chance a flammable
+node will be set on fire within a radius of 2 (if fire is installed), and
+damages players and entities within a radius of 4 with a maximum of 20
+damage points.
+
+
+Fire Shell
+* This item is only available if fire is installed.
+This shell does not destroying nodes, has a 70% chance of setting a node
+on fire, whether its flammable or not within a radius of 2, and damages
+players and entities within a radius of 4 with a maximum of 20 damage
+points.

explode.lua

@@ -0,0 +1,512 @@
+local utils = ...
+local S = utils.S
+
+
+
+
+local explode = { }
+
+
+
+if minetest.global_exists ("fire") then
+
+
+explode.fire_supported = true
+
+
+function explode.set_fire (pos, burn_all)
+	local node = utils.get_far_node (pos)
+
+	if not node then
+		return
+	end
+
+	if node.name ~= "air" then
+		local def = minetest.registered_nodes[node.name]
+
+		if not def or not def.buildable_to then
+			return
+		end
+	end
+
+	local dirs =
+	{
+		{ x = 0, y = -1, z = 0 },
+		{ x = -1, y = 0, z = 0 },
+		{ x = 0, y = 0, z = -1 },
+		{ x = 1, y = 0, z = 0 },
+		{ x = 0, y = 0, z = 1 }
+	}
+
+	for i = 1, #dirs do
+		node = utils.get_far_node (vector.add (pos, dirs[i]))
+
+		if node and node.name ~= "air" and node.name ~= "fire:basic_flame" then
+			local def = minetest.registered_nodes[node.name]
+
+			if def and def.liquidtype == "none" then
+				if (def.groups and def.groups.flammable) or burn_all then
+					minetest.set_node (pos, { name = "fire:basic_flame" })
+
+					return
+				end
+			end
+		end
+	end
+end
+
+
+else
+
+
+explode.fire_supported = false
+
+
+function explode.set_fire (pos, burn_all)
+end
+
+
+end
+
+
+
+local function is_same_item (stack1, stack2)
+	local copy1 = ItemStack (stack1)
+	local copy2 = ItemStack (stack2)
+
+	if copy1 and copy2 then
+		copy1:set_count (1)
+		copy2:set_count (1)
+
+		if copy1:to_string () == copy2:to_string () then
+			return true
+		end
+	end
+
+	return false
+end
+
+
+
+local function dig_node (pos, toolname)
+	local node = utils.get_far_node (pos)
+	local dig = false
+	local drops = nil
+
+	if toolname == true then
+		dig = true
+		toolname = nil
+	end
+
+	if node and node.name ~= "air" then
+		local def = utils.find_item_def (node.name)
+
+		if not dig then
+			if def and def.can_dig then
+				local result, can_dig = pcall (def.can_dig, pos)
+
+				dig = ((not result) or (result and (can_dig == nil or can_dig == true)))
+			else
+				dig = true
+			end
+		end
+
+		if dig then
+			local items = minetest.get_node_drops (node, toolname)
+
+			if items then
+				drops = { }
+
+				for i = 1, #items do
+					drops[i] = ItemStack (items[i])
+				end
+
+				if def and def.preserve_metadata then
+					def.preserve_metadata (pos, node, minetest.get_meta (pos), drops)
+				end
+			end
+
+			minetest.remove_node (pos)
+		end
+	end
+
+	return drops
+end
+
+
+
+local function add_drops (drops, drop)
+	if drops and drop then
+		for i = 1, #drop do
+			local item = ItemStack (drop[i])
+
+			if item and not item:is_empty () then
+				local existing = drops[item:get_name ()]
+
+				if existing and is_same_item (item, existing) then
+					existing:set_count (existing:get_count () + item:get_count ())
+				else
+					drops[item:get_name ()] = item
+				end
+			end
+		end
+	end
+end
+
+
+
+local function explode_node (pos, dig_chance, intensity, drops, filter)
+	if not utils.is_protected (pos, nil) then
+		dig_chance = math.min (math.max (dig_chance, 0), 100)
+
+		if math.random (100) <= dig_chance then
+			local node = utils.get_far_node (pos)
+			local blasted = false
+
+			if node and node.name ~= "air" then
+				local def = minetest.registered_nodes[node.name]
+
+				if def then
+					if def.diggable == false then
+						return false
+					end
+
+					for k, v in pairs (filter) do
+						if def[k] == nil then
+							if filter[k.."_undefined"] == false then
+								return false
+							end
+						elseif def[k] ~= v then
+							return false
+						end
+					end
+
+					if def.on_blast then
+						def.on_blast (pos, intensity)
+						blasted = true
+					end
+				end
+
+				if not blasted then
+					local drop = dig_node (pos, true)
+
+					add_drops (drops, drop)
+				end
+
+				minetest.check_for_falling ({ x = pos.x, y = pos.y + 1, z = pos.z })
+
+				return true
+			end
+		end
+	end
+
+	return false
+end
+
+
+
+local function burn_node (pos, fire_chance, burn_all)
+	if not utils.is_protected (pos, nil) then
+		fire_chance = math.min (math.max (fire_chance, 0), 100)
+
+		if math.random (100) <= fire_chance then
+			explode.set_fire (pos, burn_all)
+		end
+	end
+end
+
+
+
+local function entity_is_drop (obj)
+	return obj.get_luaentity and obj:get_luaentity () and
+			 obj:get_luaentity ().name and
+			 obj:get_luaentity ().name == "__builtin:item"
+end
+
+
+
+local function explode_entities (pos, radius, damage, drops)
+	local objs = minetest.get_objects_inside_radius (pos, radius)
+
+	for _, obj in pairs (objs) do
+		local obj_pos = obj:get_pos ()
+		local dir = vector.direction (pos, obj_pos)
+		local dist = vector.length (vector.subtract (obj_pos, pos))
+		local vel = vector.multiply (dir, ((radius + 1) - dist) / (radius + 1) * damage * 5)
+
+		if entity_is_drop (obj) then
+			obj:add_velocity (vel)
+
+		elseif not obj:get_armor_groups ().immortal then
+
+			local ent_damage = ((radius - dist) / radius * damage / 2) + (damage / 2)
+			local reason = { type = "set_hp", from = "lwcomponents" }
+
+			if obj:is_player() then
+				obj:add_velocity (vel)
+
+				obj:set_hp (obj:get_hp() - ent_damage, reason)
+
+			else
+				local luaobj = obj:get_luaentity()
+
+				-- object might have disappeared somehow
+				if luaobj then
+					local do_damage = true
+					local do_knockback = true
+					local entity_drops = {}
+					local objdef = minetest.registered_entities[luaobj.name]
+
+					if objdef and objdef.on_blast then
+						do_damage, do_knockback, entity_drops = objdef.on_blast (luaobj, ent_damage)
+					end
+
+					if do_knockback then
+						obj:add_velocity (vel)
+					end
+
+					if do_damage then
+						obj:set_hp (obj:get_hp() - ent_damage, reason)
+					end
+
+					add_drops (drops, entity_drops)
+				end
+			end
+		end
+	end
+end
+
+
+
+local function spray_drops (pos, drops, damage)
+	local max_vel = damage * 2.5
+
+	for k, stack in pairs (drops) do
+		local vel =
+		{
+			x = math.random (max_vel) - (max_vel / 2),
+			y = math.random (max_vel) - (max_vel / 2),
+			z = math.random (max_vel) - (max_vel / 2)
+		}
+
+		local drop = minetest.add_item (pos, stack)
+
+		if drop then
+			drop:set_velocity (vel)
+		end
+	end
+end
+
+
+
+local function add_effects (pos, radius, drops)
+	minetest.add_particle ({
+		pos = pos,
+		velocity = vector.new (),
+		acceleration = vector.new (),
+		expirationtime = 0.4,
+		size = 30, -- radius * 10,
+		collisiondetection = false,
+		vertical = false,
+		texture = "lwcomponents_boom.png",
+		glow = 15,
+	})
+
+	minetest.add_particlespawner ({
+		amount = 64,
+		time = 0.5,
+		minpos = vector.subtract (pos, radius / 2),
+		maxpos = vector.add (pos, radius / 2),
+		minvel = {x = -10, y = -10, z = -10},
+		maxvel = {x = 10, y = 10, z = 10},
+		minacc = vector.new (),
+		maxacc = vector.new (),
+		minexptime = 1,
+		maxexptime = 2.5,
+		minsize = 9,  -- radius * 3,
+		maxsize = 15, -- radius * 5,
+		texture = "lwcomponents_smoke.png",
+	})
+
+	-- we just dropped some items. Look at the items entities and pick
+	-- one of them to use as texture
+	local texture = "lwcomponents_blast.png" --fallback texture
+	local node
+	local most = 0
+
+	if drops then
+		for name, stack in pairs (drops) do
+			local count = stack:get_count()
+			if count > most then
+				most = count
+				local def = minetest.registered_nodes[name]
+				if def then
+					node = { name = name }
+				end
+				if def and def.tiles and def.tiles[1] then
+					if type (def.tiles[1]) == "table" then
+						texture = def.tiles[1].name or "lwcomponents_blast.png"
+					elseif type (def.tiles[1]) == "string" then
+						texture = def.tiles[1]
+					end
+				end
+			end
+		end
+	end
+
+	minetest.add_particlespawner ({
+		amount = 64,
+		time = 0.1,
+		minpos = vector.subtract (pos, radius / 2),
+		maxpos = vector.add (pos, radius / 2),
+		minvel = {x = -3, y = 0, z = -3},
+		maxvel = {x = 3, y = 5,  z = 3},
+		minacc = {x = 0, y = -10, z = 0},
+		maxacc = {x = 0, y = -10, z = 0},
+		minexptime = 0.8,
+		maxexptime = 2.0,
+		minsize = 1, -- radius * 0.33,
+		maxsize = 3, -- radius,
+		texture = texture,
+		-- ^ only as fallback for clients without support for `node` parameter
+		node = node,
+		collisiondetection = true,
+	})
+end
+
+
+
+function utils.boom (pos,									-- center of explosion
+							node_radius, node_chance,		-- radius and chance in 100
+							fire_radius, fire_chance,		-- radius and chance in 100
+							entity_radius, entity_damage,	-- radius and max damage applied
+							disable_drops,						-- true to disable drops
+							node_filter,						-- node filter table as { buildable_to = true, buildable_to_undefined = false, ... }
+							burn_all,							-- true to set fire to anything, otherwise only flammable
+							sound)								-- sound on blast, if nil plays default
+
+	pos = vector.round (pos)
+	node_radius = math.floor (node_radius or 1)
+	fire_radius = math.floor (fire_radius or node_radius)
+	entity_radius = math.floor (entity_radius or node_radius * 2)
+	node_chance = node_chance or 80
+	fire_chance = fire_chance or 30
+	entity_damage = math.floor (entity_damage or entity_radius)
+	disable_drops = disable_drops == true
+	node_filter = node_filter or { }
+	burn_all = burn_all == true
+	sound = sound or "lwcannon"
+
+	local drops = { }
+	local effects_radius = (node_radius > 0 and node_radius) or entity_radius
+	local center_free = false
+
+	if not utils.is_protected (pos, nil) then
+		local center_node = utils.get_far_node (pos)
+
+		if not node or node.name == "air" then
+			center_free = true
+		end
+	end
+
+	if node_radius > 0 and node_chance > 0 then
+		local extents = node_radius * 2
+
+		for y = -extents, extents, 1 do
+			for z = -extents, extents, 1 do
+				for x = -extents, extents, 1 do
+					local node_pos = { x = x + pos.x, y = y + pos.y, z = z + pos.z }
+					local length = vector.length ({ x = x, y = y, z = z })
+
+					if node_chance > 0 and length <= node_radius then
+						if explode_node (node_pos, node_chance, 1.0, drops, node_filter) then
+							if vector.equals (pos, node_pos) then
+								center_free = true
+							end
+						end
+					end
+				end
+			end
+		end
+	end
+
+	if fire_radius > 0 and fire_chance > 0 then
+		local extents = fire_radius * 2
+
+		for y = -extents, extents, 1 do
+			for z = -extents, extents, 1 do
+				for x = -extents, extents, 1 do
+					local node_pos = { x = x + pos.x, y = y + pos.y, z = z + pos.z }
+					local length = vector.length ({ x = x, y = y, z = z })
+
+					if fire_chance > 0 and length <= fire_radius then
+						burn_node (node_pos, fire_chance, burn_all)
+					end
+				end
+			end
+		end
+	end
+
+	minetest.sound_play (sound,
+								{
+									pos = pos,
+									gain = 2.5,
+									max_hear_distance = math.min (effects_radius * 20, 128)
+								},
+								true)
+
+	if center_free then
+		minetest.set_node (pos, { name = "lwcomponents:boom" })
+	end
+
+	explode_entities (pos, entity_radius, entity_damage, drops)
+
+	if not disable_drops then
+		spray_drops (pos, drops, entity_damage)
+	end
+
+	add_effects (pos, effects_radius, drops)
+
+
+	minetest.log ("action", "A Shell explosion occurred at " .. minetest.pos_to_string (pos) ..
+									" with radius " .. entity_radius)
+end
+
+
+
+minetest.register_node ("lwcomponents:boom", {
+	description = S("Boom"),
+	drawtype = "airlike",
+	tiles = { "lwcomponents_boom.png" },
+	inventory_image = "lwcomponents_boom.png",
+	wield_image = "lwcomponents_boom.png",
+	light_source = default.LIGHT_MAX,
+	use_texture_alpha = "blend",
+	sunlight_propagates = true,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	climbable = false,
+	buildable_to = true,
+	floodable = true,
+	is_ground_content = false,
+	drop = "",
+	paramtype = "light",
+	param1 = 255,
+	post_effect_color = { a = 128, r = 255, g = 0, b = 0 },
+	groups = { dig_immediate = 3, not_in_creative_inventory = 1 },
+	on_construct = function (pos)
+		minetest.get_node_timer (pos):start (0.5)
+	end,
+	on_timer = function (pos, elapsed)
+		minetest.remove_node (pos)
+
+		return false
+	end,
+	-- unaffected by explosions
+	on_blast = function() end,
+})
+
+
+
+--

fan.lua

@@ -170,7 +170,7 @@ local function after_place_node_locked (pos, placer, itemstack, pointed_thing)
 		local meta = minetest.get_meta (pos)
 
 		meta:set_string ("owner", placer:get_player_name ())
-		meta:set_string ("infotext", "Hologram (owned by "..placer:get_player_name ()..")")
+		meta:set_string ("infotext", "Fan (owned by "..placer:get_player_name ()..")")
 	end
 
 	-- If return true no item is taken from itemstack

init.lua

@@ -1,4 +1,4 @@
-local version = "0.1.8"
+local version = "0.1.12"
 local mod_storage = minetest.get_mod_storage ()
 
 
@@ -15,8 +15,9 @@ end
 local utils = { }
 local modpath = minetest.get_modpath ("lwcomponents")
 
-loadfile (modpath.."/utils.lua") (utils, mod_storage)
 loadfile (modpath.."/settings.lua") (utils)
+loadfile (modpath.."/utils.lua") (utils, mod_storage)
+loadfile (modpath.."/explode.lua") (utils)
 loadfile (modpath.."/api.lua") (utils)
 utils.connections = loadfile (modpath.."/connections.lua") ()
 loadfile (modpath.."/dropper.lua") (utils)
@@ -31,6 +32,8 @@ loadfile (modpath.."/breaker.lua") (utils)
 loadfile (modpath.."/deployer.lua") (utils)
 loadfile (modpath.."/fan.lua") (utils)
 loadfile (modpath.."/conduit.lua") (utils, mod_storage)
+loadfile (modpath.."/cannon.lua") (utils)
+loadfile (modpath.."/cannon_shell.lua") (utils)
 loadfile (modpath.."/extras.lua") (utils)
 loadfile (modpath.."/digiswitch.lua") (utils)
 loadfile (modpath.."/movefloor.lua") (utils)

license.txt

@@ -69,6 +69,11 @@ public domain.
 
 player button images derived from mesecons button image.
 
+cannon firing and explosion sound from tnt (TumeniNodes/steveygos93),
+released under CC0 1.0 (originally from https://freesound.org/s/80401/)
+
+boom image from tnt, released under CC BY-SA 3.0.
+
 All other media, or media not covered by a licence, is licensed
 Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
 

models/lwcomponents_cannon_barrel.obj

@@ -0,0 +1,625 @@
+# Blender v2.82 (sub 7) OBJ File: 'canon.blend'
+# www.blender.org
+mtllib lwcomponents_cannon_barrel.mtl
+o Canon
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+v -0.000000 -1.538639 1.549804
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+# www.blender.org
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+f 45//21 18//21 41//21
+f 16//8 38//8 14//8
+f 9//3 8//3 16//3
+f 22//19 15//19 35//19
+f 15//3 37//3 16//3
+f 16//8 20//8 38//8
+f 38//13 20//13 28//13
+f 32//5 42//5 12//5
+f 13//22 12//22 24//22
+f 12//22 42//22 24//22
+f 42//22 43//22 25//22
+f 46//22 43//22 34//22
+f 26//21 45//21 41//21
+f 14//3 19//3 15//3
+f 35//10 36//10 22//10
+f 22//19 37//19 15//19
+f 9//19 37//19 22//19
+f 44//5 34//5 42//5
+f 39//7 18//7 14//7
+f 2//8 20//8 8//8
+f 7//8 20//8 2//8
+f 38//13 41//13 39//13
+f 41//21 40//21 26//21
+f 44//5 42//5 32//5
+f 19//7 18//7 35//7
+f 34//7 18//7 46//7
+f 46//7 18//7 45//7
+f 44//18 36//18 31//18
+f 36//10 23//10 22//10
+f 38//13 40//13 41//13
+f 28//13 40//13 38//13
+f 44//18 23//18 36//18
+f 11//18 23//18 44//18
+f 45//11 43//11 46//11
+f 26//11 43//11 45//11

player_button.lua

@@ -95,6 +95,7 @@ minetest.register_node ("lwcomponents:player_button", {
 	"lwplayer_button_side.png",
 	"lwplayer_button.png"
 	},
+	use_texture_alpha = "clip",
 	paramtype = "light",
 	paramtype2 = "facedir",
 	legacy_wallmounted = true,
@@ -143,6 +144,7 @@ minetest.register_node ("lwcomponents:player_button_off", {
 	"lwplayer_button_side.png",
 	"lwplayer_button.png"
 	},
+	use_texture_alpha = "clip",
 	paramtype = "light",
 	paramtype2 = "facedir",
 	legacy_wallmounted = true,
@@ -192,6 +194,7 @@ minetest.register_node ("lwcomponents:player_button_on", {
 	"lwplayer_button_side.png",
 	"lwplayer_button_on.png"
 	},
+	use_texture_alpha = "clip",
 	paramtype = "light",
 	paramtype2 = "facedir",
 	legacy_wallmounted = true,

readme.txt

@@ -13,7 +13,7 @@ CC BY-SA 3.0
 
 Version
 =======
-0.1.8
+0.1.12
 
 
 Minetest Version
@@ -63,12 +63,14 @@ Various components for mesecons and digilines.
 *	Hologram, projects a hologram above the hologram node.
 *	Fan, blows any entity, player or drop in front of the fan.
 *	Conduit, connected in a circuit to move items.
+*	Cannon, shoots an item on command with directional aiming (plus 3 shells).
 *	Digiswitch, digilines controlled mesecons power.
 *	Movefloor, similar to vertical mesecons movestone.
 *	Solid color conductor blocks, same as Solid Color Block but also mesecons
 	and digilines conductor.
 
-To spawn entities from dispensers include the lwcomponents_spawners mod.
+To spawn entities from dispensers and cannons include the
+lwcomponents_spawners mod.
 
 See the docs folder for details on each item.
 
@@ -84,7 +86,7 @@ the relevant mod is loaded.
 The mod supports the following settings:
 
 Spawn mobs
-	Allow dispensers to spawn mobs instead of spawners.
+	Allow dispensers and cannons to spawn mobs instead of spawners.
 	Default: true
 
 Alert handler errors

settingtypes.txt

@@ -1,4 +1,4 @@
-# Allow dispensers to spawn mobs instead of spawners.
+# Allow dispensers and cannons to spawn mobs instead of spawners.
 lwcomponents_spawn_mobs (Spawn mobs) bool true
 
 # Issue errors when handler's of other mods fail.

siren.lua

@@ -269,7 +269,7 @@ local function after_place_node_locked (pos, placer, itemstack, pointed_thing)
 		local meta = minetest.get_meta (pos)
 
 		meta:set_string ("owner", placer:get_player_name ())
-		meta:set_string ("infotext", "Detector (owned by "..placer:get_player_name ()..")")
+		meta:set_string ("infotext", "Siren (owned by "..placer:get_player_name ()..")")
 	end
 
 	-- If return true no item is taken from itemstack

utils.lua

@@ -271,4 +271,62 @@ end
 
 
 
+function utils.can_place (pos)
+	local node = minetest.get_node_or_nil (pos)
+
+	if node and node.name ~= "air" then
+		local def = minetest.registered_nodes[node.name]
+
+		if not def or not def.buildable_to then
+			return false
+		end
+	end
+
+	return true
+end
+
+
+
+function utils.is_protected (pos, player)
+	local name = (player and player:get_player_name ()) or ""
+
+	return minetest.is_protected (pos, name)
+end
+
+
+
+function utils.get_on_rightclick (pos, player)
+	local node = minetest.get_node_or_nil (pos)
+
+	if node then
+		local def = minetest.registered_nodes[node.name]
+
+		if def and def.on_rightclick and
+			not (player and player:is_player () and
+				  player:get_player_control ().sneak) then
+
+				return def.on_rightclick
+		end
+	end
+
+	return nil
+end
+
+
+
+function utils.is_creative (player)
+	if minetest.settings:get_bool ("creative_mode") then
+		return true
+	end
+
+	if player and player:is_player () then
+		return minetest.is_creative_enabled (player:get_player_name ()) or
+				 minetest.check_player_privs (player, "creative")
+	end
+
+	return false
+end
+
+
+
 --