working animation

cannon.lua

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+local has_technic_mod = minetest.get_modpath("technic")
+
+
+minetest.register_entity("spacecannon:energyball", {
+	initial_properties = {
+		visual = "cube",
+		visual_size = {x=0.25, y=0.25},
+		textures = {"spark.png"},
+		collisionbox = {-0.25,-0.25,-0.25, 0.25,0.25,0.25},
+		physical = false,
+		timer=0
+	},
+
+	on_step = function(self, dtime)
+		if self.timer == nil then
+			return --XXX
+		end
+		self.timer=self.timer+dtime
+		if self.timer >= 0.3 then
+			local pos = self.object:getpos()
+			local node = minetest.get_node(pos)
+
+			if node.name == "air" then
+				local objs = minetest.get_objects_inside_radius({x=pos.x,y=pos.y,z=pos.z}, 3)
+				for k, obj in pairs(objs) do
+				if obj:get_luaentity() ~= nil then
+					if obj:get_luaentity().name ~= self.name and obj:get_luaentity().name ~= "__builtin:item" then --something other found
+						local mob = obj
+						-- self.on_mob_hit(self,pos,mob)
+						end
+					elseif obj:is_player() then --player found
+					local player = obj
+						-- self.on_player_hit(self,pos,player)
+					end		
+				end
+			elseif node.name ~= "air"  then
+
+			end
+		end	
+	end,
+
+	on_activate = function(self, staticdata)
+			minetest.after(8.0, 
+				function(self) 
+					self.object:remove()
+				end,
+				self)
+	end,
+
+	on_rightclick=function(self, clicker)
+	end,
+
+	on_punch = function(self, hitter)
+	end,
+})
+
+
+
+minetest.register_node("spacecannon:cannon", {
+	description = "Spacecannon",
+	tiles = {"cannon.png","cannon_front.png","cannon.png","cannon.png","cannon.png","cannon.png"},
+	groups = {cracky=3,oddly_breakable_by_hand=3,technic_machine = 1, technic_hv = 1},
+	drop = "spacecannon:cannon",
+	sounds = default.node_sound_glass_defaults(),
+
+	mesecons = {effector = {
+		action_on = function (pos, node)
+			local obj = minetest.add_entity({x=pos.x, y=pos.y, z=pos.z+1}, "spacecannon:energyball")
+			obj:setvelocity({x=0, y=0, z=1})
+			-- obj:setacceleration({x=dir.x*-3, y=-settings.gravity, z=dir.z*-3})
+		end
+	}},
+
+	connects_to = {"group:technic_hv_cable"},
+	connect_sides = {"bottom", "top", "left", "right", "front", "back"},
+
+	after_place_node = function(pos, placer)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("owner", placer:get_player_name() or "")
+	end,
+
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_int("powerstorage", 0)
+
+		if has_technic_mod then
+			meta:set_int("HV_EU_input", 0)
+			meta:set_int("HV_EU_demand", 0)
+		end
+	end,
+
+	technic_run = function(pos, node)
+		local meta = minetest.get_meta(pos)
+		local eu_input = meta:get_int("HV_EU_input")
+		local demand = meta:get_int("HV_EU_demand")
+		local store = meta:get_int("powerstorage")
+
+		meta:set_string("infotext", "Power: " .. eu_input .. "/" .. demand .. " Store: " .. store)
+
+		if store < spacecannon.config.powerstorage then
+			-- charge
+			meta:set_int("HV_EU_demand", spacecannon.config.powerrequirement)
+			store = store + eu_input
+			meta:set_int("powerstorage", store)
+		else
+			-- charged
+			meta:set_int("HV_EU_demand", 0)
+		end
+	end
+})
+
+if has_technic_mod then
+	technic.register_machine("HV", "spacecannon:cannon", technic.receiver)
+end
+
+minetest.register_craft({
+	output = 'spacecannon:cannon',
+	recipe = {
+		{'', 'default:tnt', ''},
+		{'default:diamond', 'default:mese_block', 'default:diamond'},
+		{'', 'default:tnt', ''}
+	}
+})
+

depends.txt

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+default
+technic?
+mesecons?

init.lua

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+
+spacecannon = {
+	config = {
+		-- technic EU storage value
+		powerstorage = 100000,
+
+		-- charge value in EU
+		powerrequirement = 2500,
+
+	}
+}
+
+local MP = minetest.get_modpath("spacecannon")
+
+dofile(MP.."/cannon.lua")
+
+print("[OK] Spacecannon")