Add files via upload

camera.lua

@@ -0,0 +1,452 @@
+local utils = ...
+local S = utils.S
+
+
+
+if utils.digilines_supported then
+
+
+
+local function is_drop (obj)
+	if obj then
+		local entity = obj.get_luaentity and obj:get_luaentity ()
+
+		return (entity and entity.name and entity.name == "__builtin:item")
+	end
+
+	return false
+end
+
+
+
+local function get_entity_dims (obj)
+	local dims = { -0.5, 0, -0.5, 0.5, 2, 0.5 }
+	local found = false
+
+	if obj.get_luaentity then
+		local entity = obj:get_luaentity ()
+
+		if entity and entity.name then
+			local def = minetest.registered_entities[entity.name]
+
+			if def and type (def.collisionbox) == "table" then
+
+				dims = { def.collisionbox[1] or -0.5,
+							def.collisionbox[2] or -0.5,
+							def.collisionbox[3] or -0.5,
+							def.collisionbox[4] or 0.5,
+							def.collisionbox[5] or 0.5,
+							def.collisionbox[6] or 0.5 }
+
+				found = true
+			end
+		end
+	end
+
+	if not found then
+		local props = obj:get_properties ()
+		if props and props.collisionbox and type (props.collisionbox) == "table" then
+
+			dims = { props.collisionbox[1] or -0.5,
+						props.collisionbox[2] or -0.5,
+						props.collisionbox[3] or -0.5,
+						props.collisionbox[4] or 0.5,
+						props.collisionbox[5] or 0.5,
+						props.collisionbox[6] or 0.5 }
+		end
+	end
+
+	dims[1] = math.min (dims[1], dims[3])
+	dims[3] = dims[1]
+	dims[4] = math.max (dims[4], dims[6])
+	dims[6] = dims[4]
+
+	if (dims[3] - dims[1]) < 1 then
+		dims[1] = -0.5
+		dims[3] = -0.5
+		dims[4] = 0.5
+		dims[6] = 0.5
+	end
+
+	return dims
+end
+
+
+
+local function get_entity (pos)
+	local objects = minetest.get_objects_inside_radius (pos, 2.0)
+
+	if #objects > 0 then
+		for _, obj in ipairs (objects) do
+			if obj.get_pos then
+				if obj:is_player () then
+					local epos =  vector.round (obj:get_pos ())
+
+					if epos.x == pos.x and epos.z == pos.z and
+							(epos.y == pos.y or epos.y == pos.y - 1) then
+						return 1
+					end
+				end
+
+				if not is_drop (obj) then
+					local epos =  vector.new (obj:get_pos ())
+					local dims = get_entity_dims (obj)
+
+					if pos.x >= (epos.x + dims[1]) and pos.x <= (epos.x + dims[4]) and
+							pos.y >= (epos.y + dims[2]) and pos.y <= (epos.y + dims[5]) and
+							pos.z >= (epos.z + dims[3]) and pos.z <= (epos.z + dims[6]) then
+						return 2
+					end
+				end
+			end
+		end
+	end
+
+	return nil
+end
+
+
+
+local function camera_scan (pos, resolution, distance)
+	local node = utils.get_far_node (pos)
+	local image = { }
+
+	for y = 1, resolution, 1 do
+		image[y] = { }
+
+		for x = 1, resolution, 1 do
+			image[y][x] = "000000"
+		end
+	end
+
+	if node then
+		local dir = vector.multiply (minetest.facedir_to_dir (node.param2), -1)
+		local last_pos = nil
+		local last_color = "000000"
+		local view = (distance * 1.414213562) / resolution
+
+		for dist = distance, 1, -1 do
+			local scale = dist / distance
+
+			for y = 1, resolution, 1 do
+				for x = 1, resolution, 1 do
+					local horz = (x - (resolution / 2)) * scale * view
+					local vert = (y - (resolution / 2)) * scale * view
+
+					local tpos = nil
+					if dir.x ~= 0 then
+						tpos = vector.round ({ x = (dist * dir.x) + pos.x, y = pos.y - vert, z = horz + pos.z })
+					else
+						tpos = vector.round ({ x = horz + pos.x, y = pos.y - vert, z = (dist * dir.z) + pos.z })
+					end
+
+
+					if last_pos and vector.equals (last_pos, tpos) then
+						image[y][x] = last_color
+					else
+						local entity = get_entity (tpos)
+
+						if entity == 1 then
+							local color = (((distance - dist) / distance) * 98) + 30
+
+							last_color = string.format ("00%02X00", color)
+							image[y][x] = last_color
+							last_pos = tpos
+						elseif entity == 2 then
+							local color = (((distance - dist) / distance) * 98) + 30
+
+							last_color = string.format ("0000%02X", color)
+							image[y][x] = last_color
+							last_pos = tpos
+						else
+							local node = utils.get_far_node (tpos)
+
+							if node and node.name ~= "air" then
+								local color = (((distance - dist) / distance) * 98) + 30
+
+								last_color = string.format ("%02X%02X%02X", color, color, color)
+								image[y][x] = last_color
+								last_pos = tpos
+							else
+								last_pos = nil
+							end
+						end
+					end
+				end
+			end
+		end
+	end
+
+	return image
+end
+
+
+
+local function send_scan (pos)
+	local meta = minetest.get_meta (pos)
+
+	if meta then
+		local channel = meta:get_string ("channel")
+
+		if channel:len () > 0 then
+			local image = camera_scan (pos,
+												tonumber (meta:get_string ("resolution")),
+												tonumber (meta:get_string ("distance")))
+
+			utils.digilines_receptor_send (pos,
+													 utils.digilines_default_rules,
+													 channel,
+													 image)
+		end
+
+
+	end
+end
+
+
+
+local function after_place_node (pos, placer, itemstack, pointed_thing)
+	local meta = minetest.get_meta (pos)
+	local spec =
+	"formspec_version[3]\n"..
+	"size[8.5,5.5;true]\n"..
+	"field[1.0,1.0;4.0,0.8;channel;Channel;${channel}]\n"..
+	"button[5.5,1.0;2.0,0.8;setchannel;Set]\n"..
+	"field[1.0,2.5;4.0,0.8;distance;Distance;${distance}]\n"..
+	"button[5.5,2.5;2.0,0.8;setdistance;Set]\n"..
+	"field[1.0,4.0;4.0,0.8;resolution;Resolution;${resolution}]\n"..
+	"button[5.5,4.0;2.0,0.8;setresolution;Set]\n"
+
+	meta:set_string ("formspec", spec)
+	meta:set_string ("distance", "5")
+	meta:set_string ("resolution", "16")
+
+	-- If return true no item is taken from itemstack
+	return false
+end
+
+
+
+local function after_place_node_locked (pos, placer, itemstack, pointed_thing)
+	after_place_node (pos, placer, itemstack, pointed_thing)
+
+	if placer and placer:is_player () then
+		local meta = minetest.get_meta (pos)
+
+		meta:set_string ("owner", placer:get_player_name ())
+		meta:set_string ("infotext", "Camera (owned by "..placer:get_player_name ()..")")
+	end
+
+	-- If return true no item is taken from itemstack
+	return false
+end
+
+
+
+local function on_receive_fields (pos, formname, fields, sender)
+	if not utils.can_interact_with_node (pos, sender) then
+		return
+	end
+
+	if fields.setchannel then
+		local meta = minetest.get_meta (pos)
+
+		if meta then
+			meta:set_string ("channel", fields.channel)
+		end
+	end
+
+	if fields.setdistance then
+		local meta = minetest.get_meta (pos)
+
+		if meta then
+			local distance = math.min (math.max (tonumber (fields.distance) or 1, 1), 16)
+			fields.distance = tostring (distance)
+
+			meta:set_string ("distance", tostring (distance))
+		end
+	end
+
+	if fields.setresolution then
+		local meta = minetest.get_meta (pos)
+
+		if meta then
+			local resolution = math.max (tonumber (fields.resolution) or 1, 1)
+			fields.resolution = tostring (resolution)
+
+			meta:set_string ("resolution", tostring (resolution))
+		end
+	end
+end
+
+
+
+local function can_dig (pos, player)
+	if not utils.can_interact_with_node (pos, player) then
+		return false
+	end
+
+	return true
+end
+
+
+
+local function on_blast (pos, intensity)
+	local meta = minetest.get_meta (pos)
+
+	if meta then
+		if intensity >= 1.0 then
+			minetest.remove_node (pos)
+
+		else -- intensity < 1.0
+			local node = minetest.get_node_or_nil (pos)
+			if node then
+				local items = minetest.get_node_drops (node, nil)
+
+				if items and #items > 0 then
+					local stack = ItemStack (items[1])
+
+					if stack then
+						preserve_metadata (pos, node, meta, { stack })
+						utils.item_drop (stack, nil, pos)
+						minetest.remove_node (pos)
+					end
+				end
+			end
+		end
+	end
+end
+
+
+
+local function on_rightclick (pos, node, clicker, itemstack, pointed_thing)
+	if not utils.can_interact_with_node (pos, clicker) then
+		if clicker and clicker:is_player () then
+			local owner = "<unknown>"
+			local meta = minetest.get_meta (pos)
+
+			if meta then
+				owner = meta:get_string ("owner")
+			end
+
+			local spec =
+			"formspec_version[3]"..
+			"size[8.0,4.0,false]"..
+			"label[1.0,1.0;Owned by "..minetest.formspec_escape (owner).."]"..
+			"button_exit[3.0,2.0;2.0,1.0;close;Close]"
+
+			minetest.show_formspec (clicker:get_player_name (),
+											"lwcomponents:component_privately_owned",
+											spec)
+		end
+	end
+
+	return itemstack
+end
+
+
+
+local function digilines_support ()
+	if utils.digilines_supported then
+		return
+		{
+			wire =
+			{
+				rules = utils.digilines_default_rules,
+			},
+
+			effector =
+			{
+				action = function (pos, node, channel, msg)
+					local meta = minetest.get_meta(pos)
+
+					if meta then
+						local this_channel = meta:get_string ("channel")
+
+						if this_channel ~= "" and this_channel == channel and
+							type (msg) == "string" then
+
+							local m = { }
+							for w in string.gmatch(msg, "[^%s]+") do
+								m[#m + 1] = w
+							end
+
+							if m[1] == "scan" then
+								send_scan (pos)
+
+							elseif m[1] == "distance" then
+								meta:set_string ("distance", tostring (tonumber (m[2] or 5) or 5))
+
+							elseif m[1] == "resolution" then
+								meta:set_string ("resolution", tostring (tonumber (m[2] or 16) or 16))
+
+							end
+						end
+					end
+				end,
+			}
+		}
+	end
+
+	return nil
+end
+
+
+
+minetest.register_node("lwcomponents:camera", {
+	description = S("Camera"),
+	tiles = { "lwcamera.png", "lwcamera.png", "lwcamera.png",
+				 "lwcamera.png", "lwcamera.png", "lwcamera_lens.png"},
+	is_ground_content = false,
+	groups = { cracky = 3 },
+	sounds = default.node_sound_stone_defaults (),
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	floodable = false,
+	drop = "lwcomponents:camera",
+	_digistuff_channelcopier_fieldname = "channel",
+
+	digiline = digilines_support (),
+
+	on_receive_fields = on_receive_fields,
+	can_dig = can_dig,
+	after_place_node = after_place_node,
+	on_blast = on_blast,
+	on_rightclick = on_rightclick
+})
+
+
+
+minetest.register_node("lwcomponents:camera_locked", {
+	description = S("Camera (locked)"),
+	tiles = { "lwcamera.png", "lwcamera.png", "lwcamera.png",
+				 "lwcamera.png", "lwcamera.png", "lwcamera_lens.png"},
+	is_ground_content = false,
+	groups = { cracky = 3 },
+	sounds = default.node_sound_stone_defaults (),
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	floodable = false,
+	drop = "lwcomponents:camera_locked",
+	_digistuff_channelcopier_fieldname = "channel",
+
+	digiline = digilines_support (),
+
+	on_receive_fields = on_receive_fields,
+	can_dig = can_dig,
+	after_place_node = after_place_node_locked,
+	on_blast = on_blast,
+	on_rightclick = on_rightclick
+})
+
+
+
+end -- utils.digilines_supported
+
+
+
+--

cannon.lua

@@ -5,7 +5,7 @@ local S = utils.S
 
 local cannon_force = 20
 local min_pitch = -20
-local max_pitch = 50
+local max_pitch = 70
 local min_rotation = -60
 local max_rotation = 60
 
@@ -298,6 +298,7 @@ local function process_controller_input (pos, input)
 			local pitch = input.pitch * -180 / math.pi
 			local node_rot = vector.dir_to_rotation (minetest.facedir_to_dir ((node.param2 + 2) % 4))
 			local rot = (input.yaw - node_rot.y) * 180 / math.pi
+			local sensitivity = (meta:get_string ("sensitive") == "true" and 3) or 1
 
 			while rot > 180 do
 				rot = rot - 360
@@ -311,8 +312,8 @@ local function process_controller_input (pos, input)
 				rot = -rot
 			end
 
-			set_barrel_pitch (pos, pitch * 3)
+			set_barrel_pitch (pos, pitch * sensitivity)
-			set_barrel_rotation (pos, rot * 3)
+			set_barrel_rotation (pos, rot * sensitivity)
 
 			if input.dig then
 				fire_cannon (pos)
@@ -323,15 +324,19 @@ end
 
 
 
-local function get_formspec ()
+local function get_formspec (pos)
+	local meta = minetest.get_meta (pos)
+	local sensitive = (meta and meta:get_string ("sensitive")) or "false"
+
 	return
 	"formspec_version[3]\n"..
 	"size[11.75,10.75;true]\n"..
 	"field[1.0,1.0;4.0,0.8;channel;Channel;${channel}]\n"..
 	"button[5.5,1.0;2.0,0.8;setchannel;Set]\n"..
 	"button[8.5,1.0;2.0,0.8;hide;Hide]\n"..
-	"field[1.0,3.0;4.0,0.8;controller;Controller;${controller}]\n"..
+	"field[1.0,2.6;4.0,0.8;controller;Controller;${controller}]\n"..
-	"button[5.5,3.0;2.0,0.8;setcontroller;Set]\n"..
+	"button[5.5,2.6;2.0,0.8;setcontroller;Set]\n"..
+	"checkbox[1.3,3.8;sensitive;Sensitive;"..sensitive.."]\n"..
 	"list[context;main;9.0,2.75;1,1;]\n"..
 	"list[current_player;main;1.0,5.0;8,4;]\n"..
 	"listring[]"
@@ -365,6 +370,7 @@ local function on_construct (pos)
 	if barrel then
 		set_barrel_rotation (pos, 0)
 		set_barrel_pitch (pos, 0)
+		barrel:set_armor_groups ({ immortal = 1 })
 	end
 
 	minetest.set_node (blank_pos, { name = "lwcomponents:cannon_blank" })
@@ -392,14 +398,16 @@ end
 local function after_place_node (pos, placer, itemstack, pointed_thing)
 	local meta = minetest.get_meta (pos)
 
+	meta:set_string ("sensitive", "true")
 	meta:set_string ("inventory", "{ main = { } }")
-	meta:set_string ("formspec", get_formspec ())
 
 	local inv = meta:get_inventory ()
 
 	inv:set_size ("main", 1)
 	inv:set_width ("main", 1)
 
+	meta:set_string ("formspec", get_formspec (pos))
+
 	-- If return true no item is taken from itemstack
 	return false
 end
@@ -542,6 +550,15 @@ local function on_receive_fields (pos, formname, fields, sender)
 			meta:set_string ("formspec", "")
 		end
 	end
+
+	if fields.sensitive ~= nil then
+		local meta = minetest.get_meta (pos)
+
+		if meta then
+			meta:set_string ("sensitive", fields.sensitive)
+			meta:set_string ("formspec", get_formspec (pos))
+		end
+	end
 end
 
 
@@ -660,29 +677,26 @@ local function on_rightclick (pos, node, clicker, itemstack, pointed_thing)
 				if hz == 0.5 and hy >= -0.5 and hy <= 0.2 then
 					local angle = get_barrel_angle  (pos)
 
-					if hx >= -0.5 and hx <= -0.25 and hy >= -0.25 and hy <= -0.0625 then
+					if angle then
-						-- left
+						if hx >= -0.5 and hx <= -0.25 and hy >= -0.25 and hy <= -0.0625 then
-						set_barrel_rotation (pos, angle.y + inc)
+							-- left
-
+							set_barrel_rotation (pos, angle.y + inc)
-					elseif hx >= 0.25 and hx <= 0.5 and hy >= -0.25 and hy <= -0.0625 then
+						elseif hx >= 0.25 and hx <= 0.5 and hy >= -0.25 and hy <= -0.0625 then
-						-- right
+							-- right
-						set_barrel_rotation (pos, angle.y - inc)
+							set_barrel_rotation (pos, angle.y - inc)
-
+						elseif hx >= -0.125 and hx <= 0.125 and hy >= 0.0 and hy <= 0.1875 then
-					elseif hx >= -0.125 and hx <= 0.125 and hy >= 0.0 and hy <= 0.1875 then
+							-- up
-						-- up
+							set_barrel_pitch (pos, angle.x + inc)
-						set_barrel_pitch (pos, angle.x + inc)
+						elseif hx >= -0.125 and hx <= 0.125 and hy >= -0.5 and hy <= -0.3125 then
-
+							-- down
-					elseif hx >= -0.125 and hx <= 0.125 and hy >= -0.5 and hy <= -0.3125 then
+							set_barrel_pitch (pos, angle.x - inc)
-						-- down
+						elseif hx >= -0.125 and hx <= 0.125 and hy >= -0.25 and hy <= -0.0625 then
-						set_barrel_pitch (pos, angle.x - inc)
+							-- fire
-
+							fire_cannon (pos)
-					elseif hx >= -0.125 and hx <= 0.125 and hy >= -0.25 and hy <= -0.0625 then
+						end
-						-- fire
-						fire_cannon (pos)
-
 					end
 				else
-					meta:set_string ("formspec", get_formspec ())
+					meta:set_string ("formspec", get_formspec (pos))
 				end
 			end
 		end
@@ -839,6 +853,8 @@ minetest.register_node("lwcomponents:cannon_blank", {
 	drop = "",
 	groups = { not_in_creative_inventory = 1 },
 	paramtype = "light",
+	-- unaffected by explosions
+	on_blast = function() end,
 })
 
 
@@ -858,6 +874,8 @@ minetest.register_node("lwcomponents:cannon_blank_fire", {
 	drop = "",
 	groups = { not_in_creative_inventory = 1 },
 	paramtype = "light",
+	-- unaffected by explosions
+	on_blast = function() end,
 })
 
 
@@ -877,7 +895,7 @@ minetest.register_node("lwcomponents:cannon", {
 		type = "fixed",
 		fixed = {
 			{ -0.09, 0, -0.09, 0.09, 0.5, 0.09 },
-			{ -0.5, -0.1875, -0.5, 0.5, 0.125, 0.5 },
+			{ -0.5, -0.25, -0.5, 0.5, 0.125, 0.5 },
 			{ -0.4375, -0.1875, -0.4375, 0.4375, 0.1875, 0.5 },
 			{ -0.5, -0.5, 0.3125, 0.5, 0.125, 0.5 },
 			{ -0.5, -0.5, -0.5, -0.3125, 0.125, -0.3125 },
@@ -939,7 +957,7 @@ minetest.register_node("lwcomponents:cannon_locked", {
 		type = "fixed",
 		fixed = {
 			{ -0.09, 0, -0.09, 0.09, 0.5, 0.09 },
-			{ -0.5, -0.1875, -0.5, 0.5, 0.125, 0.5 },
+			{ -0.5, -0.25, -0.5, 0.5, 0.125, 0.5 },
 			{ -0.4375, -0.1875, -0.4375, 0.4375, 0.1875, 0.5 },
 			{ -0.5, -0.5, 0.3125, 0.5, 0.125, 0.5 },
 			{ -0.5, -0.5, -0.5, -0.3125, 0.125, -0.3125 },
@@ -1023,6 +1041,10 @@ minetest.register_entity ("lwcomponents:cannon_barrel", {
 	on_punch = function (self, puncher, time_from_last_punch, tool_capabilities, dir)
 		return true
 	end,
+
+	on_blast = function (self, damage)
+		return false, false, nil
+	end,
 })
 
 

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

@@ -67,3 +67,38 @@ v0.1.10
 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.
+
+
+v0.1.13
+*	Removed optional dependency lwdrops.
+
+
+v0.1.14
+*	Calls on_drop when item is dropped.
+
+
+v0.1.15
+*	Fixed bug call to clear_map in fan on_blast.
+*	Added pistons.
+
+
+v0.1.16
+*	Fixed piston interaction with non-walkable nodes.
+
+
+v0.1.17
+*	Fixed unintended global variable in pistons.lua.
+
+v0.1.18
+*	Added mesecons through wire.
+
+
+v0.1.19
+*	Added camera.

crafting.lua

@@ -23,6 +23,49 @@ minetest.register_craft( {
 })
 
 
+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 -- minetest.global_exists ("fire")
+
+
+
+if utils.mesecon_supported then
+
+minetest.register_craft( {
+	output = "lwcomponents:through_wire_off 2",
+	recipe = {
+		{ "", "mesecons:wire_00000000_off" },
+		{ "mesecons:wire_00000000_off", "" },
+	},
+})
+
+end -- utils.mesecon_supported
+
+
 
 if utils.digilines_supported or utils.mesecon_supported then
 
@@ -189,6 +232,26 @@ minetest.register_craft( {
 	},
 })
 
+
+minetest.register_craft({
+	output = "lwcomponents:piston 2",
+	recipe = {
+		{ "group:wood", "group:wood", "group:wood" },
+		{ "default:cobble", "default:steel_ingot", "default:cobble" },
+		{ "default:stone", "default:copper_ingot", "default:stone" },
+	}
+})
+
+
+minetest.register_craft({
+	output = "lwcomponents:piston_sticky",
+	recipe = {
+		{"group:sapling"},
+		{"lwcomponents:piston"},
+	}
+})
+
+
 end -- utils.digilines_supported or utils.mesecon_supported
 
 
@@ -232,6 +295,24 @@ minetest.register_craft( {
 	},
 })
 
+
+minetest.register_craft( {
+	output = "lwcomponents:camera",
+	recipe = {
+		{ "default:copper_ingot", "default:iron_lump" },
+		{ "default:chest", "default:stone" },
+	},
+})
+
+
+minetest.register_craft( {
+	output = "lwcomponents:camera_locked",
+	recipe = {
+		{ "default:copper_ingot", "default:iron_lump" },
+		{ "default:chest_locked", "default:stone" },
+	},
+})
+
 end -- utils.digilines_supported
 
 

depends.txt

@@ -1,5 +1,4 @@
 default
-lwdrops?
 mesecons?
 digilines?
 unifieddyes?

deployer.lua

@@ -73,7 +73,7 @@ end
 
 
 
-local function place_node (itemname, pos)
+local function place_node (item, pos)
 	local node = minetest.get_node_or_nil ({ x = pos.x, y = pos.y - 1, z = pos.z })
 
 	if not node then
@@ -100,8 +100,8 @@ local function place_node (itemname, pos)
 		end
 	end
 
-	local stack = ItemStack (itemname)
+	local stack = ItemStack (item)
-	local itemdef = utils.find_item_def (itemname)
+	local itemdef = utils.find_item_def (stack:get_name ())
 
 	if stack and itemdef then
 		local placed = false
@@ -122,23 +122,23 @@ local function place_node (itemname, pos)
 		end
 
 		if itemdef and itemdef.on_place then
-			local result, msg = pcall (itemdef.on_place, stack, nil, pointed_thing)
+			local result, leftover = pcall (itemdef.on_place, stack, nil, pointed_thing)
 
 			placed = result
 
 			if not placed then
 				if utils.settings.alert_handler_errors then
-					minetest.log ("error", "on_place handler for "..itemname.." crashed - "..msg)
+					minetest.log ("error", "on_place handler for "..stack:get_name ().." crashed - "..leftover)
 				end
 			end
 		end
 
 		if not placed then
-			if not minetest.registered_nodes[itemname] then
+			if not minetest.registered_nodes[stack:get_name ()] then
 				return false
 			end
 
-			minetest.set_node (pos, { name = itemname, param1 = 0, param2 = 0 })
+			minetest.set_node (pos, { name = stack:get_name (), param1 = 0, param2 = 0 })
 
 			if itemdef and itemdef.after_place_node then
 				local result, msg = pcall (itemdef.after_place_node, pos, nil, stack, pointed_thing)
@@ -154,9 +154,11 @@ local function place_node (itemname, pos)
 				pcall (minetest.sound_play, itemdef.sounds.place, { pos = pos })
 			end
 		end
+
+		return true
 	end
 
-	return true
+	return false
 end
 
 
@@ -219,7 +221,7 @@ local function deploy_item (pos, node, slot, range)
 					local deploypos = get_deploy_pos (pos, node.param2, range)
 
 					if item and deploypos then
-						if place_node (name, deploypos) then
+						if place_node (stack, deploypos) then
 							stack:set_count (stack:get_count () - 1)
 							inv:set_stack ("main", slot, stack)
 

detector.lua

@@ -165,7 +165,7 @@ local function detect (pos)
 		local object = minetest.get_objects_inside_radius (pos, radius + 0.5)
 		local detected_list = { }
 
-		for i = 1, #object do
+		for i = 1, #object, 1 do
 			if object[i]:is_player () then
 
 				-- player

docs/camera.txt

@@ -0,0 +1,41 @@
+Camera
+------
+* This block is only available if digilines is loaded.
+
+Cameras take an image in the direction they are facing. The colors in the
+image represent what is being viewed. Nodes are gray, entities are blue and
+players are green. The closer they are to the camera the brighter the color.
+The viewing distance of the camera is 1 to 16 nodes. Also acts as a
+digilines conductor.
+
+Only the owner can dig or access the form of the locked version.
+
+UI
+
+Channel - digilines channel of camera.
+Distance - the viewing distance forward from the camera (1 t0 16).
+Resolution - the image resolution (for both width and height).
+
+Digilines messages
+
+"scan"
+	Sends a digilines message with the camera's channel and a table of the
+	image as the message (see below).
+
+"distance n"
+	Sets the viewing distance of the camera. Will be clipped between 1 and
+	16.
+
+"resolution n"
+	Sets the image resolution of the camera.
+
+The image is an indexed table of indexed tables. Each inner table is one
+line of the image ordered top to bottom. There are resolution number of
+lines. Each line has a string value for each pixel of that line left to
+right. The string is a hex color string eg. "00FF00". There are resolution
+number of pixels per line.
+
+The image format is compatible with digistuff's digiscreens and lwcomputers'
+digiscreens and digipanels. It is best to set the resolution of the camera
+to the resolution of the display, then the image from the camera can be sent
+straight to the display device.

docs/cannon.txt

@@ -9,7 +9,7 @@ release them from the bottom.
 
 Cannon rotation range:
 side to side - +/-60 degrees (- = left, + = right)
-down to up: -20 to 50 degrees (- = down, + = up)
+down to up: -20 to 70 degrees (- = down, + = up)
 
 To spawn entities from cannons include the lwcomponents_spawners mod.
 
@@ -21,6 +21,7 @@ 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.
 
@@ -35,11 +36,11 @@ 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. The movements have an increased sensitivity
+direction the cannon is facing. If Sensitive is checked the movements
-(x3) to try and keep the target in your view. Punching shoots an item.
+have an increased sensitivity (x3) to try and keep the target in your view,
-The game controller updates every 0.2 seconds, so a quick punch may not
+otherwise x1. Punching shoots an item. The game controller updates every
-register. A locked cannon can only be controlled by it's owner with a game
+0.2 seconds, so a quick punch may not register. A locked cannon can only
-controller.
+be controlled by it's owner with a game controller.
 
 Mesecons
 	Shoots an item when power is turned on.
@@ -47,7 +48,7 @@ Mesecons
 Digilines messages
 
 "pitch <n>"
-	Sets the pitch of the barrel. n should be between -20 to 50, and will
+	Sets the pitch of the barrel. n should be between -20 to 70, and will
 	be clipped to this range.
 	eg. "pitch 22"
 
@@ -56,8 +57,47 @@ Digilines messages
 	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.

docs/pistons.txt

@@ -0,0 +1,31 @@
+Pistons and sticky pistons
+--------------------------
+* These blocks are only available if digilines and/or mesecons are loaded.
+
+Pistons push up to the setting Maximum piston nodes (default 15) in front
+of the pusher when extended. Sticky piston draw back a single node in
+front of the pusher when retracted. Piston also act as a digilines
+conductor.
+
+UI
+
+Channel - digilines channel of piston.
+Single move - pusher extends 1 node if checked, otherwise 2 nodes.
+
+Mesecons
+	Piston extends while power is turned on.
+
+Digilines messages
+
+"extend n"
+	Extends the piston pusher to extent n (0, 1 or 2). If n is not given
+	pusher extends to maximum extent. 0 is retracted.
+
+"retract"
+	Same as 'extend 0'.
+
+"single"
+	Sets piston to single move mode.
+
+"double"
+	Sets piston to double move mode.

docs/through_wire.txt

@@ -0,0 +1,7 @@
+Mesecons Through Wire
+---------------------
+* This block is only available if mesecons is loaded.
+
+Will transmit mesecons power when placed one to two blocks apart opposing
+each other, through solid blocks or open space. Can also be used as a mesecons
+crossover.

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

@@ -199,14 +199,10 @@ local function on_blast (pos, intensity)
 	if meta then
 		if intensity >= 1.0 then
 
-			clear_map (pos)
-
 			minetest.remove_node (pos)
 
 		else -- intensity < 1.0
 
-			clear_map (pos)
-
 			local node = minetest.get_node_or_nil (pos)
 			if node then
 				local items = minetest.get_node_drops (node, nil)

init.lua

@@ -1,4 +1,4 @@
-local version = "0.1.11"
+local version = "0.1.19"
 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)
@@ -32,6 +33,10 @@ 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.."/pistons.lua") (utils)
+loadfile (modpath.."/through_wire.lua") (utils)
+loadfile (modpath.."/camera.lua") (utils)
 loadfile (modpath.."/extras.lua") (utils)
 loadfile (modpath.."/digiswitch.lua") (utils)
 loadfile (modpath.."/movefloor.lua") (utils)

license.txt

@@ -13,6 +13,8 @@ without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 See the GNU Lesser General Public License for more details:
 https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 
+Mesecons through wire code was adapted from mesecons_receiver.
+
 
 
 lwsiren-buzz.ogg
@@ -67,9 +69,17 @@ public domain.
 fan images derived from images from https://openclipart.org, which is
 public domain.
 
+camera lens images derived from images from https://openclipart.org, which
+is public domain.
+
 player button images derived from mesecons button image.
 
-cannon firing sound from tnt, released under CC BY-SA 3.0 and CC0 1.0
+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.
+
+Piston images and sounds from mesecons_pistons, 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)

mod.conf

@@ -3,4 +3,4 @@ description = Various components for mesecons and digilines.
 title = LWComponents
 name = lwcomponents
 depends = default
-optional_depends = lwdrops, mesecons, digilines, unifieddyes, intllib, hopper, digistuff
+optional_depends = mesecons, digilines, unifieddyes, intllib, hopper, digistuff

models/lwcomponents_shell.obj

@@ -0,0 +1,162 @@
+# Blender v2.82 (sub 7) OBJ File: 'shell.blend'
+# www.blender.org
+mtllib shell.mtl
+o Sell
+v 1.188815 0.386266 -2.500000
+v 1.188815 -0.386266 -0.000000
+v 1.188815 -0.386266 -2.500000
+v -1.188815 -0.386266 0.000000
+v -1.188815 0.386266 -2.500000
+v -1.188815 -0.386266 -2.500000
+v 1.188815 0.386266 -0.000000
+v 0.951055 -0.309014 0.499997
+v 0.734730 -1.011265 -0.000000
+v -0.734730 -1.011265 -2.500000
+v -0.734730 -1.011265 0.000000
+v -0.951055 0.309014 0.499997
+v -1.188815 0.386266 0.000000
+v 0.237761 -0.077252 2.000000
+v 0.440836 -0.606760 1.000000
+v 0.713290 -0.231762 1.000000
+v 0.734730 1.011265 -2.500000
+v 0.146942 0.202250 2.000000
+v 0.146942 -0.202250 2.000000
+v 0.951055 0.309014 0.499997
+v -0.000000 -1.250000 -2.500000
+v 0.000000 -1.250000 0.000000
+v -0.587785 -0.809015 0.499997
+v -0.734730 1.011265 0.000000
+v -0.587785 0.809015 0.499997
+v 0.000000 1.250000 0.000000
+v 0.734730 -1.011265 -2.500000
+v 0.734730 1.011265 -0.000000
+v -0.000000 1.250000 -2.500000
+v -0.146942 -0.202250 2.000000
+v -0.237760 -0.077252 2.000000
+v -0.951055 -0.309014 0.499997
+v -0.734730 1.011265 -2.500000
+v -0.237760 0.077252 2.000000
+v 0.000000 -0.249996 2.000000
+v -0.440836 -0.606760 1.000000
+v 0.587785 -0.809015 0.499997
+v 0.713290 0.231762 1.000000
+v 0.237761 0.077252 2.000000
+v 0.587785 0.809015 0.499997
+v 0.440836 0.606760 1.000000
+v -0.713290 0.231762 1.000000
+v -0.440836 0.606760 1.000000
+v -0.713290 -0.231762 1.000000
+v 0.000000 0.249996 2.000000
+v -0.146942 0.202250 2.000000
+vn 1.0000 0.0000 0.0000
+vn -1.0000 0.0000 0.0000
+vn 0.7306 -0.5308 0.4294
+vn -0.8090 -0.5878 0.0000
+vn -0.9031 0.0000 0.4294
+vn 0.8090 0.5878 0.0000
+vn 0.0000 0.0000 1.0000
+vn 0.9031 0.0000 0.4294
+vn 0.0000 0.0000 -1.0000
+vn -0.2791 -0.8589 0.4294
+vn -0.2791 0.8589 0.4294
+vn -0.3090 -0.9511 0.0000
+vn 0.7306 0.5308 0.4294
+vn 0.3090 0.9511 0.0000
+vn -0.8090 0.5878 0.0000
+vn -0.3090 0.9511 0.0000
+vn 0.3090 -0.9511 0.0000
+vn -0.7306 -0.5308 0.4294
+vn 0.2791 -0.8589 0.4294
+vn 0.8090 -0.5878 0.0000
+vn 0.2791 0.8589 0.4294
+vn -0.7306 0.5308 0.4294
+usemtl None
+s off
+f 1//1 2//1 3//1
+f 4//2 5//2 6//2
+f 7//1 2//1 1//1
+f 2//3 8//3 9//3
+f 4//4 10//4 11//4
+f 4//5 12//5 13//5
+f 14//3 15//3 16//3
+f 1//6 17//6 7//6
+f 14//7 18//7 19//7
+f 8//8 20//8 16//8
+f 10//9 5//9 21//9
+f 6//4 10//4 4//4
+f 22//10 23//10 11//10
+f 24//11 25//11 26//11
+f 3//9 5//9 1//9
+f 21//9 5//9 27//9
+f 11//12 10//12 22//12
+f 28//13 20//13 7//13
+f 17//14 26//14 28//14
+f 7//6 17//6 28//6
+f 29//14 26//14 17//14
+f 24//15 5//15 13//15
+f 29//16 24//16 26//16
+f 22//17 27//17 9//17
+f 30//7 18//7 31//7
+f 11//18 32//18 4//18
+f 33//15 5//15 24//15
+f 29//9 5//9 33//9
+f 31//7 18//7 34//7
+f 15//19 19//19 35//19
+f 33//16 24//16 29//16
+f 27//9 5//9 3//9
+f 22//12 10//12 21//12
+f 21//17 27//17 22//17
+f 13//2 5//2 4//2
+f 6//9 5//9 10//9
+f 2//20 27//20 3//20
+f 9//20 27//20 2//20
+f 31//18 36//18 30//18
+f 32//5 12//5 4//5
+f 17//9 5//9 29//9
+f 1//9 5//9 17//9
+f 35//7 18//7 30//7
+f 16//3 37//3 9//3
+f 14//8 38//8 39//8
+f 26//21 40//21 28//21
+f 41//13 18//13 39//13
+f 24//22 42//22 25//22
+f 25//11 43//11 26//11
+f 31//5 34//5 44//5
+f 30//10 36//10 35//10
+f 34//22 43//22 42//22
+f 44//18 32//18 11//18
+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

models/piston_normal_1.obj

@@ -0,0 +1,143 @@
+# Blender v2.82 (sub 7) OBJ File: ''
+# www.blender.org
+mtllib piston_normal_1.mtl
+o cube
+v 0.500000 -0.500000 0.500000
+v -0.500000 -0.500000 0.500000
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models/piston_normal_2.obj

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models/piston_sticky_1.obj

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models/piston_sticky_2.obj

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+f 23/56/15 21/57/15 22/58/15 24/59/15
+f 18/60/16 23/61/16 24/62/16 19/63/16
+f 24/64/17 22/65/17 20/66/17 19/67/17
+f 18/68/18 17/69/18 21/70/18 23/71/18

pistons.lua

@@ -0,0 +1,937 @@
+local utils = ...
+local S = utils.S
+
+
+
+if utils.digilines_supported or utils.mesecon_supported then
+
+
+
+local piston_interval = 0.2
+
+
+
+local function direction_vector (node)
+	local axis = math.floor (node.param2 / 4)
+	local rotate = node.param2 % 4
+	local vec = { x = 0, y = 0, z = 0 }
+
+	if rotate == 0 then
+		vec = { x = 0, y = 0, z = -1 }
+	elseif rotate == 1 then
+		vec = { x = -1, y = 0, z = 0 }
+	elseif rotate == 2 then
+		vec = { x = 0, y = 0, z = 1 }
+	elseif rotate == 3 then
+		vec = { x = 1, y = 0, z = 0 }
+	end
+
+	if axis == 1 then
+		vec = vector.rotate (vec, { x = math.pi / -2, y = 0, z = 0 })
+	elseif axis == 2 then
+		vec = vector.rotate (vec, { x = math.pi / 2, y = 0, z = 0 })
+	elseif axis == 3 then
+		vec = vector.rotate (vec, { x = 0, y = 0, z = math.pi / 2 })
+	elseif axis == 4 then
+		vec = vector.rotate (vec, { x = 0, y = 0, z = math.pi / -2 })
+	elseif axis == 5 then
+		vec = vector.rotate (vec, { x = math.pi, y = 0, z = 0 })
+	end
+
+	return vec
+end
+
+
+
+local function push_entities (pos, vec)
+	local tpos = vector.add (pos, vec)
+	local tnode = utils.get_far_node (tpos)
+	local can_move = false
+
+	if tnode then
+		if tnode.name == "air" then
+			can_move = true
+		else
+			local tdef = utils.find_item_def (tnode.name)
+
+			can_move = tdef and not tdef.walkable
+		end
+	end
+
+	if can_move then
+		local object = minetest.get_objects_inside_radius (pos, 1.5)
+
+		for j = 1, #object do
+			if object[j].get_pos then
+				local opos = object[j]:get_pos ()
+
+				if opos.x > (pos.x - 0.5) and opos.x < (pos.x + 0.5) and
+					opos.z > (pos.z - 0.5) and opos.z < (pos.z + 0.5) and
+					opos.y > (pos.y - 0.5) and opos.y < (pos.y + 0.5) then
+
+					object[j]:set_pos (vector.add (opos, vec))
+				end
+			end
+		end
+	end
+end
+
+
+
+local function push_nodes (pos, extent)
+	local node = utils.get_far_node (pos)
+
+	if node then
+		local vec = direction_vector (node)
+		local last = vector.add (pos, vector.multiply (vec, extent))
+		local maxnodes = utils.settings.max_piston_nodes + 1
+		local count = 0
+
+		for i = 1, maxnodes do
+			local tnode = utils.get_far_node (last)
+
+			if not tnode then
+				return false
+			end
+
+			local tdef = utils.find_item_def (tnode.name)
+
+			if tnode.name == "air" or (tdef and not tdef.walkable) then
+				count = i - 1
+				break
+			end
+
+			if i == maxnodes then
+				return false
+			end
+
+			last = vector.add (last, vec)
+		end
+
+		push_entities (last, vec)
+
+		for i = 1, count, 1 do
+			local cpos = vector.subtract (last, vec)
+			local cnode = utils.get_far_node (cpos)
+			local cmeta = minetest.get_meta (cpos)
+
+			if not cnode or not cmeta then
+				return false
+			end
+
+			local tmeta = cmeta:to_table ()
+
+			push_entities (cpos, vec)
+
+			minetest.remove_node (cpos)
+			minetest.set_node (last, cnode)
+
+			if tmeta then
+				cmeta = minetest.get_meta (last)
+
+				if not cmeta then
+					return false
+				end
+
+				cmeta:from_table (tmeta)
+			end
+
+			last = cpos
+		end
+	end
+
+	return true
+end
+
+
+
+local function pull_node (pos, extent)
+	local node = utils.get_far_node (pos)
+
+	if node then
+		local vec = direction_vector (node)
+		local cpos = vector.add (pos, vector.multiply (vec, extent))
+		local cnode = utils.get_far_node (cpos)
+		local cdef = cnode and utils.find_item_def (cnode.name)
+
+		if cnode and cnode.name ~= "air" and cdef and cdef.walkable then
+
+			local cmeta = minetest.get_meta (cpos)
+
+			if cmeta then
+				local tpos = vector.subtract (cpos, vec)
+				local tmeta = cmeta:to_table ()
+
+				minetest.remove_node (cpos)
+				minetest.set_node (tpos, cnode)
+
+				if tmeta then
+					cmeta = minetest.get_meta (tpos)
+
+					if cmeta then
+						cmeta:from_table (tmeta)
+					end
+				end
+			end
+		end
+	end
+end
+
+
+
+local function place_blank (pos, extent)
+	local node = utils.get_far_node (pos)
+
+	if node then
+		local vec = direction_vector (node)
+		local blank_pos = vector.add (pos, vector.multiply (vec, extent))
+		local blank_node = utils.get_far_node (blank_pos)
+		local blank_def = blank_node and utils.find_item_def (blank_node.name)
+
+		if blank_node and blank_node.name == "air" or
+			(blank_def and not blank_def.walkable) then
+
+			minetest.set_node (blank_pos,
+									 {
+										name = "lwcomponents:piston_blank_"..tostring (extent),
+										param2 = node.param2
+									 })
+		end
+	end
+end
+
+
+
+local function remove_blank (pos, extent)
+	local node = utils.get_far_node (pos)
+
+	if node then
+		local vec = direction_vector (node)
+		local blank_pos = vector.add (pos, vector.multiply (vec, extent))
+		local blank_node = utils.get_far_node (blank_pos)
+
+		if blank_node and
+			blank_node.name == "lwcomponents:piston_blank_"..tostring (extent) then
+
+			minetest.remove_node (blank_pos)
+		end
+	end
+end
+
+
+
+local function extend_piston (pos, extent)
+	local node = utils.get_far_node (pos)
+	local meta = minetest.get_meta (pos)
+
+	if node and meta then
+		extent = math.max (math.min (tonumber (extent or 2), meta:get_int ("max_extent")), 0)
+
+		if node.name == "lwcomponents:piston" then
+			if extent ~= 0 then
+				if push_nodes (pos, 1) then
+					node.name = "lwcomponents:piston_1"
+					minetest.swap_node (pos, node)
+					place_blank (pos, 1)
+					minetest.sound_play ("lwpiston_extend",
+												{
+													pos = pos,
+													max_hear_distance = 20,
+													gain = 0.3
+												},
+												true)
+
+					if extent == 2 then
+						meta:set_int ("extent", 2)
+						minetest.get_node_timer (pos):start (piston_interval)
+
+						return true
+					end
+				end
+			end
+
+		elseif node.name == "lwcomponents:piston_1" then
+			if extent == 0 then
+				remove_blank (pos, 1)
+				node.name = "lwcomponents:piston"
+				minetest.swap_node (pos, node)
+				minetest.sound_play ("lwpiston_retract",
+											{
+												pos = pos,
+												max_hear_distance = 20,
+												gain = 0.3
+											},
+											true)
+
+			elseif extent == 2 then
+				if push_nodes (pos, 2) then
+					node.name = "lwcomponents:piston_2"
+					minetest.swap_node (pos, node)
+					place_blank (pos, 2)
+					minetest.sound_play ("lwpiston_extend",
+												{
+													pos = pos,
+													max_hear_distance = 20,
+													gain = 0.3
+												},
+												true)
+				end
+			end
+
+		elseif node.name == "lwcomponents:piston_2" then
+			if extent ~= 2 then
+				remove_blank (pos, 2)
+				node.name = "lwcomponents:piston_1"
+				minetest.swap_node (pos, node)
+				minetest.sound_play ("lwpiston_retract",
+											{
+												pos = pos,
+												max_hear_distance = 20,
+												gain = 0.3
+											},
+											true)
+
+				if extent == 0 then
+					meta:set_int ("extent", 0)
+					minetest.get_node_timer (pos):start (piston_interval)
+
+					return true
+				end
+			end
+
+		elseif node.name == "lwcomponents:piston_sticky" then
+			if extent ~= 0 then
+				if push_nodes (pos, 1) then
+					node.name = "lwcomponents:piston_sticky_1"
+					minetest.swap_node (pos, node)
+					place_blank (pos, 1)
+					minetest.sound_play ("lwpiston_extend",
+												{
+													pos = pos,
+													max_hear_distance = 20,
+													gain = 0.3
+												},
+												true)
+
+					if extent == 2 then
+						meta:set_int ("extent", 2)
+						minetest.get_node_timer (pos):start (piston_interval)
+
+						return true
+					end
+				end
+			end
+
+
+		elseif node.name == "lwcomponents:piston_sticky_1" then
+			if extent == 0 then
+				remove_blank (pos, 1)
+				node.name = "lwcomponents:piston_sticky"
+				minetest.swap_node (pos, node)
+				pull_node (pos, 2)
+				minetest.sound_play ("lwpiston_retract",
+											{
+												pos = pos,
+												max_hear_distance = 20,
+												gain = 0.3
+											},
+											true)
+
+			elseif extent == 2 then
+				if push_nodes (pos, 2) then
+					node.name = "lwcomponents:piston_sticky_2"
+					minetest.swap_node (pos, node)
+					place_blank (pos, 2)
+					minetest.sound_play ("lwpiston_extend",
+												{
+													pos = pos,
+													max_hear_distance = 20,
+													gain = 0.3
+												},
+												true)
+				end
+			end
+
+		elseif node.name == "lwcomponents:piston_sticky_2" then
+			if extent ~= 2 then
+				remove_blank (pos, 2)
+				node.name = "lwcomponents:piston_sticky_1"
+				minetest.swap_node (pos, node)
+				pull_node (pos, 3)
+				minetest.sound_play ("lwpiston_retract",
+											{
+												pos = pos,
+												max_hear_distance = 20,
+												gain = 0.3
+											},
+											true)
+
+				if extent == 0 then
+					meta:set_int ("extent", 0)
+					minetest.get_node_timer (pos):start (piston_interval)
+
+					return true
+				end
+			end
+		end
+	end
+
+	return false
+end
+
+
+
+local function on_destruct_1 (pos)
+	remove_blank (pos, 1)
+end
+
+
+
+local function on_destruct_2 (pos)
+	remove_blank (pos, 2)
+	remove_blank (pos, 1)
+end
+
+
+
+local function on_place (itemstack, placer, pointed_thing)
+	local param2 = 0
+
+	if placer and placer:is_player () then
+		param2 = minetest.dir_to_facedir (placer:get_look_dir (), true)
+	elseif pointed_thing and pointed_thing.type == "node" then
+		param2 = minetest.dir_to_facedir (vector.subtract (pointed_thing.under, pointed_thing.above), true)
+	end
+
+	return minetest.item_place (itemstack, placer, pointed_thing, param2)
+end
+
+
+
+
+local function after_place_node (pos, placer, itemstack, pointed_thing)
+	local meta = minetest.get_meta (pos)
+	local spec =
+	"size[7,3.3]"..
+	"field[1,1;4,2;channel;Channel;${channel}]"..
+	"button_exit[4.6,1.15;1.5,1;submit;Set]"..
+	"checkbox[1,2;single;Single move;false]"
+
+	meta:set_string ("formspec", spec)
+	meta:set_int ("max_extent", 2)
+
+	-- If return true no item is taken from itemstack
+	return false
+end
+
+
+
+local function on_receive_fields (pos, formname, fields, sender)
+	if not utils.can_interact_with_node (pos, sender) then
+		return
+	end
+
+	local meta = minetest.get_meta (pos)
+
+	if meta then
+		if fields.submit then
+			meta:set_string ("channel", fields.channel)
+		end
+
+		if fields.single then
+			if fields.single == "true" then
+				local spec =
+				"size[7,3.3]"..
+				"field[1,1;4,2;channel;Channel;${channel}]"..
+				"button_exit[4.6,1.15;1.5,1;submit;Set]"..
+				"checkbox[1,2;single;Single move;true]"
+
+				meta:set_int ("max_extent", 1)
+				meta:set_string ("formspec", spec)
+			else
+				local spec =
+				"size[7,3.3]"..
+				"field[1,1;4,2;channel;Channel;${channel}]"..
+				"button_exit[4.6,1.15;1.5,1;submit;Set]"..
+				"checkbox[1,2;single;Single move;false]"
+
+				meta:set_int ("max_extent", 2)
+				meta:set_string ("formspec", spec)
+			end
+		end
+	end
+end
+
+
+
+local function on_blast (pos, intensity)
+	local meta = minetest.get_meta (pos)
+
+	if meta then
+		if intensity >= 1.0 then
+
+			minetest.remove_node (pos)
+
+		else -- intensity < 1.0
+
+			local node = minetest.get_node_or_nil (pos)
+			if node then
+				local items = minetest.get_node_drops (node, nil)
+
+				if items and #items > 0 then
+					local stack = ItemStack (items[1])
+
+					if stack then
+						preserve_metadata (pos, node, meta, { stack })
+						utils.item_drop (stack, nil, pos)
+						minetest.remove_node (pos)
+					end
+				end
+			end
+		end
+	end
+end
+
+
+
+local function can_dig (pos, player)
+	if not utils.can_interact_with_node (pos, player) then
+		return false
+	end
+
+	return true
+end
+
+
+
+local function on_rightclick (pos, node, clicker, itemstack, pointed_thing)
+	if not utils.can_interact_with_node (pos, clicker) then
+		if clicker and clicker:is_player () then
+			local owner = "<unknown>"
+			local meta = minetest.get_meta (pos)
+
+			if meta then
+				owner = meta:get_string ("owner")
+			end
+
+			local spec =
+			"formspec_version[3]"..
+			"size[8.0,4.0,false]"..
+			"label[1.0,1.0;Owned by "..minetest.formspec_escape (owner).."]"..
+			"button_exit[3.0,2.0;2.0,1.0;close;Close]"
+
+			minetest.show_formspec (clicker:get_player_name (),
+											"lwcomponents:component_privately_owned",
+											spec)
+		end
+	end
+
+	return itemstack
+end
+
+
+
+local function on_timer (pos, elapsed)
+	local meta = minetest.get_meta (pos)
+
+	if meta then
+		return extend_piston (pos, meta:get_int ("extent"))
+	end
+
+	return false
+end
+
+
+
+local function digilines_support ()
+	if utils.digilines_supported then
+		return
+		{
+			wire =
+			{
+				rules = utils.digilines_default_rules,
+			},
+
+			effector =
+			{
+				action = function (pos, node, channel, msg)
+					local meta = minetest.get_meta(pos)
+
+					if meta then
+						local this_channel = meta:get_string ("channel")
+
+						if this_channel ~= "" and this_channel == channel then
+							if type (msg) == "string" then
+								local m = { }
+								for w in string.gmatch(msg, "[^%s]+") do
+									m[#m + 1] = w
+								end
+
+								if m[1] == "extend" then
+									extend_piston (pos, m[2])
+
+								elseif m[1] == "retract" then
+									extend_piston (pos, 0)
+
+								elseif m[1] == "single" then
+									local spec =
+									"size[7,3.3]"..
+									"field[1,1;4,2;channel;Channel;${channel}]"..
+									"button_exit[4.6,1.15;1.5,1;submit;Set]"..
+									"checkbox[1,2;single;Single move;true]"
+
+									meta:set_int ("max_extent", 1)
+									meta:set_string ("formspec", spec)
+
+								elseif m[1] == "double" then
+									local spec =
+									"size[7,3.3]"..
+									"field[1,1;4,2;channel;Channel;${channel}]"..
+									"button_exit[4.6,1.15;1.5,1;submit;Set]"..
+									"checkbox[1,2;single;Single move;false]"
+
+									meta:set_int ("max_extent", 2)
+									meta:set_string ("formspec", spec)
+
+								end
+							end
+						end
+					end
+				end,
+			}
+		}
+	end
+
+	return nil
+end
+
+
+
+local function mesecon_support ()
+	if utils.mesecon_supported then
+		return
+		{
+			effector =
+			{
+				rules = utils.mesecon_default_rules,
+
+				action_on = function (pos, node)
+					-- do something to turn the effector on
+					extend_piston (pos, 2)
+				end,
+
+				action_off = function (pos, node)
+					-- do something to turn the effector off
+					extend_piston (pos, 0)
+				end,
+			}
+		}
+	end
+
+	return nil
+end
+
+
+
+minetest.register_node("lwcomponents:piston_blank_1", {
+	description = S("Piston blank"),
+	drawtype = "airlike",
+	light_source = 0,
+	sunlight_propagates = true,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	climbable = false,
+	buildable_to = false,
+	floodable = false,
+	is_ground_content = false,
+	drop = "",
+	groups = { not_in_creative_inventory = 1 },
+	paramtype = "light",
+	-- unaffected by explosions
+	on_blast = function() end,
+})
+
+
+
+minetest.register_node("lwcomponents:piston_blank_2", {
+	description = S("Piston blank"),
+	drawtype = "airlike",
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	collision_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -0.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -0.5, 0.5, 0.5, -0.3125},
+		},
+	},
+	light_source = 0,
+	sunlight_propagates = true,
+	walkable = true,
+	pointable = false,
+	diggable = false,
+	climbable = false,
+	buildable_to = false,
+	floodable = false,
+	is_ground_content = false,
+	drop = "",
+	groups = { not_in_creative_inventory = 1 },
+	paramtype = "light",
+	-- unaffected by explosions
+	on_blast = function() end,
+})
+
+
+
+minetest.register_node("lwcomponents:piston", {
+	description = S("Double Piston"),
+	tiles = { "lwcomponents_piston_top.png", "lwcomponents_piston_bottom.png",
+				 "lwcomponents_piston_right.png", "lwcomponents_piston_left.png",
+				 "lwcomponents_piston_base.png", "lwcomponents_piston_pusher.png" },
+	is_ground_content = false,
+	groups = { cracky = 3 },
+	sounds = default.node_sound_stone_defaults (),
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	floodable = false,
+	drop = "lwcomponents:piston",
+	_digistuff_channelcopier_fieldname = "channel",
+
+	mesecons = mesecon_support (),
+	digiline = digilines_support (),
+
+	on_place = on_place,
+	on_receive_fields = on_receive_fields,
+	can_dig = can_dig,
+	after_place_node = after_place_node,
+	on_blast = on_blast,
+	on_rightclick = on_rightclick,
+	on_timer = on_timer
+})
+
+
+
+minetest.register_node("lwcomponents:piston_1", {
+	description = S("Double Piston"),
+	drawtype = "mesh",
+	mesh = "piston_normal_1.obj",
+	tiles = { "lwcomponents_piston.png" },
+	visual_scale = 1.0,
+	selection_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -1.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -1.5, 0.5, 0.5, -1.3125},
+			{-0.5, -0.5, -0.3125, 0.5, 0.5, 0.5},
+		},
+	},
+	collision_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -1.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -1.5, 0.5, 0.5, -1.3125},
+			{-0.5, -0.5, -0.3125, 0.5, 0.5, 0.5},
+		},
+	},
+	is_ground_content = false,
+	groups = { cracky = 3 , not_in_creative_inventory = 1 },
+	sounds = default.node_sound_stone_defaults (),
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	floodable = false,
+	drop = "lwcomponents:piston",
+	_digistuff_channelcopier_fieldname = "channel",
+
+	mesecons = mesecon_support (),
+	digiline = digilines_support (),
+
+	on_destruct = on_destruct_1,
+	on_receive_fields = on_receive_fields,
+	can_dig = can_dig,
+	after_place_node = after_place_node,
+	on_blast = on_blast,
+	on_rightclick = on_rightclick,
+	on_timer = on_timer
+})
+
+
+
+minetest.register_node("lwcomponents:piston_2", {
+	description = S("Double Piston"),
+	drawtype = "mesh",
+	mesh = "piston_normal_2.obj",
+	tiles = { "lwcomponents_piston.png" },
+	visual_scale = 1.0,
+	selection_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -2.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -2.5, 0.5, 0.5, -2.3125},
+			{-0.5, -0.5, -0.3125, 0.5, 0.5, 0.5},
+		},
+	},
+	collision_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -2.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -2.5, 0.5, 0.5, -2.3125},
+			{-0.5, -0.5, -0.3125, 0.5, 0.5, 0.5},
+		},
+	},
+	is_ground_content = false,
+	groups = { cracky = 3 , not_in_creative_inventory = 1 },
+	sounds = default.node_sound_stone_defaults (),
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	floodable = false,
+	drop = "lwcomponents:piston",
+	_digistuff_channelcopier_fieldname = "channel",
+
+	mesecons = mesecon_support (),
+	digiline = digilines_support (),
+
+	on_destruct = on_destruct_2,
+	on_receive_fields = on_receive_fields,
+	can_dig = can_dig,
+	after_place_node = after_place_node,
+	on_blast = on_blast,
+	on_rightclick = on_rightclick,
+	on_timer = on_timer
+})
+
+
+
+minetest.register_node("lwcomponents:piston_sticky", {
+	description = S("Double Sticky Piston"),
+	tiles = { "lwcomponents_piston_top.png", "lwcomponents_piston_bottom.png",
+				 "lwcomponents_piston_right.png", "lwcomponents_piston_left.png",
+				 "lwcomponents_piston_base.png", "lwcomponents_piston_pusher_sticky.png" },
+	is_ground_content = false,
+	groups = { cracky = 3 },
+	sounds = default.node_sound_stone_defaults (),
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	floodable = false,
+	drop = "lwcomponents:piston_sticky",
+	_digistuff_channelcopier_fieldname = "channel",
+
+	mesecons = mesecon_support (),
+	digiline = digilines_support (),
+
+	on_place = on_place,
+	on_receive_fields = on_receive_fields,
+	can_dig = can_dig,
+	after_place_node = after_place_node,
+	on_blast = on_blast,
+	on_rightclick = on_rightclick,
+	on_timer = on_timer
+})
+
+
+
+minetest.register_node("lwcomponents:piston_sticky_1", {
+	description = S("Double Sticky Piston"),
+	drawtype = "mesh",
+	mesh = "piston_sticky_1.obj",
+	tiles = { "lwcomponents_piston.png" },
+	visual_scale = 1.0,
+	selection_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -1.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -1.5, 0.5, 0.5, -1.3125},
+			{-0.5, -0.5, -0.3125, 0.5, 0.5, 0.5},
+		},
+	},
+	collision_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -1.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -1.5, 0.5, 0.5, -1.3125},
+			{-0.5, -0.5, -0.3125, 0.5, 0.5, 0.5},
+		},
+	},
+	is_ground_content = false,
+	groups = { cracky = 3 , not_in_creative_inventory = 1 },
+	sounds = default.node_sound_stone_defaults (),
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	floodable = false,
+	drop = "lwcomponents:piston_sticky",
+	_digistuff_channelcopier_fieldname = "channel",
+
+	mesecons = mesecon_support (),
+	digiline = digilines_support (),
+
+	on_destruct = on_destruct_1,
+	on_receive_fields = on_receive_fields,
+	can_dig = can_dig,
+	after_place_node = after_place_node,
+	on_blast = on_blast,
+	on_rightclick = on_rightclick,
+	on_timer = on_timer
+})
+
+
+
+minetest.register_node("lwcomponents:piston_sticky_2", {
+	description = S("Double Sticky Piston"),
+	drawtype = "mesh",
+	mesh = "piston_sticky_2.obj",
+	tiles = { "lwcomponents_piston.png" },
+	visual_scale = 1.0,
+	selection_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -2.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -2.5, 0.5, 0.5, -2.3125},
+			{-0.5, -0.5, -0.3125, 0.5, 0.5, 0.5},
+		},
+	},
+	collision_box = {
+		type = "fixed",
+		fixed = {
+			{-0.125, -0.125, -2.4, 0.125, 0.125, 0.4},
+			{-0.5, -0.5, -2.5, 0.5, 0.5, -2.3125},
+			{-0.5, -0.5, -0.3125, 0.5, 0.5, 0.5},
+		},
+	},
+	is_ground_content = false,
+	groups = { cracky = 3 , not_in_creative_inventory = 1 },
+	sounds = default.node_sound_stone_defaults (),
+	paramtype = "none",
+	param1 = 0,
+	paramtype2 = "facedir",
+	param2 = 0,
+	floodable = false,
+	drop = "lwcomponents:piston_sticky",
+	_digistuff_channelcopier_fieldname = "channel",
+
+	mesecons = mesecon_support (),
+	digiline = digilines_support (),
+
+	on_destruct = on_destruct_2,
+	on_receive_fields = on_receive_fields,
+	can_dig = can_dig,
+	after_place_node = after_place_node,
+	on_blast = on_blast,
+	on_rightclick = on_rightclick,
+	on_timer = on_timer
+})
+
+
+
+end -- utils.digilines_supported or utils.mesecon_supported

readme.txt

@@ -13,7 +13,7 @@ CC BY-SA 3.0
 
 Version
 =======
-0.1.11
+0.1.19
 
 
 Minetest Version
@@ -28,7 +28,6 @@ default
 
 Optional Dependencies
 =====================
-lwdrops
 mesecons
 digilines
 unifieddyes
@@ -63,9 +62,12 @@ 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.
+*	Cannon, shoots an item on command with directional aiming (plus 3 shells).
+*	Double (optionally single) reach pistons and sticky pistons.
 *	Digiswitch, digilines controlled mesecons power.
 *	Movefloor, similar to vertical mesecons movestone.
+*	Camera, takes a representative image.
+*	Mesecons Through Wire, transmits through 1 to 2 solid blocks.
 *	Solid color conductor blocks, same as Solid Color Block but also mesecons
 	and digilines conductor.
 
@@ -93,6 +95,9 @@ Alert handler errors
 	Issue errors when handler's of other mods fail.
 	Default: true
 
+Maximum piston nodes
+	Maximum nodes a piston can push.
+	Default: 15
 
 
 ------------------------------------------------------------------------

settings.lua

@@ -9,6 +9,9 @@ utils.settings.spawn_mobs =
 utils.settings.alert_handler_errors =
 	minetest.settings:get_bool ("lwcomponents_alert_handler_errors", true)
 
+utils.settings.max_piston_nodes =
+	tonumber(minetest.settings:get("lwcomponents_max_piston_nodes") or 15)
+
 
 
 --

settingtypes.txt

@@ -3,3 +3,6 @@ lwcomponents_spawn_mobs (Spawn mobs) bool true
 
 # Issue errors when handler's of other mods fail.
 lwcomponents_alert_handler_errors (Alert handler errors) bool true
+
+# Maximum nodes a piston can push.
+lwcomponents_max_piston_nodes (Maximum piston nodes) int 15

through_wire.lua

@@ -0,0 +1,80 @@
+local utils = ...
+local S = utils.S
+
+
+
+if utils.mesecon_supported then
+
+
+
+local through_wire_get_rules = function (node)
+	local rules = { {x = -1, y = 0, z = 0},
+						 {x =  2, y = 0, z = 0},
+						 {x =  3, y = 0, z = 0} }
+
+	if node.param2 == 2 then
+		rules = mesecon.rotate_rules_left(rules)
+	elseif node.param2 == 3 then
+		rules = mesecon.rotate_rules_right(mesecon.rotate_rules_right(rules))
+	elseif node.param2 == 0 then
+		rules = mesecon.rotate_rules_right(rules)
+	end
+
+	return rules
+end
+
+
+
+mesecon.register_node ("lwcomponents:through_wire", {
+	description = S("Mesecons Through Wire"),
+	drawtype = "nodebox",
+	paramtype = "light",
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	sunlight_propagates = true,
+	walkable = false,
+	on_rotate = false,
+	selection_box = {
+		type = "fixed",
+		fixed = { -3/16, -8/16, -8/16, 3/16, 3/16, 8/16 }
+	},
+	node_box = {
+		type = "fixed",
+		fixed = {
+			{ -3/16, -3/16, 13/32        , 3/16,  3/16  , 8/16        }, -- the smaller bump
+			{ -1/32, -1/32, 1/2          , 1/32,  1/32  , 3/2         }, -- the wire through the block
+			{ -2/32, -1/2 , 0.5002-3/32  , 2/32,  0     , 0.5         }, -- the vertical wire bit
+			{ -2/32, -1/2 , -16/32+0.001 , 2/32,  -14/32,  7/16+0.002 }  -- the horizontal wire
+		}
+	},
+	drop = "lwcomponents:through_wire_off",
+	sounds = default.node_sound_defaults(),
+}, {
+	tiles = { "mesecons_wire_off.png" },
+	groups = { dig_immediate = 3 },
+	mesecons = {
+		conductor = {
+			state = mesecon.state.off,
+			rules = through_wire_get_rules,
+			onstate = "lwcomponents:through_wire_on"
+		}
+	}
+}, {
+	tiles = { "mesecons_wire_on.png" },
+	groups = { dig_immediate = 3, not_in_creative_inventory = 1 },
+	mesecons = {
+		conductor = {
+			state = mesecon.state.on,
+			rules = through_wire_get_rules,
+			offstate = "lwcomponents:through_wire_off"
+		}
+	}
+})
+
+
+
+end -- utils.mesecon_supported
+
+
+
+--

utils.lua

@@ -67,43 +67,6 @@ end
 
 
 
--- check for lwdrops
-if minetest.global_exists ("lwdrops") then
-	utils.lwdrops_supported = true
-	utils.on_destroy = lwdrops.on_destroy
-	utils.item_pickup = lwdrops.item_pickup
-	utils.item_drop = lwdrops.item_drop
-else
-	utils.lwdrops_supported = false
-
-	-- dummy
-	utils.on_destroy = function (itemstack)
-	end
-
-	utils.item_pickup = function (entity, cleanup)
-		local stack = nil
-
-		if entity and entity.name and entity.name == "__builtin:item" and
-			entity.itemstring and entity.itemstring ~= "" then
-
-			stack = ItemStack (entity.itemstring)
-
-			if cleanup ~= false then
-				entity.itemstring = ""
-				entity.object:remove ()
-			end
-		end
-
-		return stack
-	end
-
-	utils.item_drop = function (itemstack, dropper, pos)
-		return minetest.item_drop (itemstack, dropper, pos)
-	end
-end
-
-
-
 -- check for unifieddyes
 if minetest.global_exists ("unifieddyes") then
 	utils.unifieddyes_supported = true
@@ -138,6 +101,53 @@ end
 
 
 
+function utils.on_destroy (itemstack)
+	local stack = ItemStack (itemstack)
+
+	if stack and stack:get_count () > 0 then
+		local def = utils.find_item_def (stack:get_name ())
+
+		if def and def.on_destroy then
+			def.on_destroy (stack)
+		end
+	end
+end
+
+
+
+function utils.item_pickup (entity, cleanup)
+	local stack = nil
+
+	if entity and entity.name and entity.name == "__builtin:item" and
+		entity.itemstring and entity.itemstring ~= "" then
+
+		stack = ItemStack (entity.itemstring)
+
+		if cleanup ~= false then
+			entity.itemstring = ""
+			entity.object:remove ()
+		end
+	end
+
+	return stack
+end
+
+
+
+function utils.item_drop (itemstack, dropper, pos)
+	if itemstack then
+		local def = utils.find_item_def (itemstack:get_name ())
+
+		if def and def.on_drop then
+			return def.on_drop (itemstack, dropper, pos)
+		end
+	end
+
+	return minetest.item_drop (itemstack, dropper, pos)
+end
+
+
+
 function utils.can_interact_with_node (pos, player)
 	if not player or not player:is_player () then
 		return false
@@ -321,7 +331,7 @@ function utils.is_creative (player)
 
 	if player and player:is_player () then
 		return minetest.is_creative_enabled (player:get_player_name ()) or
-				 minetest.check_player_privs (placer, "creative")
+				 minetest.check_player_privs (player, "creative")
 	end
 
 	return false