advtrains/advtrains/couple.lua


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--couple.lua
--defines couple entities.

--advtrains:discouple
--set into existing trains to split them when punched.
--they are attached to the wagons.
--[[fields
wagon

wagons keep their couple entity minetest-internal id inside the field discouple_id. if it refers to nowhere, they will spawn a new one if player is near
]]

local couple_max_dist=3

minetest.register_entity("advtrains:discouple", {
	visual="sprite",
	textures = {"advtrains_discouple.png"},
	collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
	visual_size = {x=1, y=1},
	initial_sprite_basepos = {x=0, y=0},
	
	is_discouple=true,
	on_activate=function(self, staticdata) 
		if staticdata=="DISCOUPLE" then
			--couple entities have no right to exist further...
			atprint("Discouple loaded from staticdata, destroying")
			self.object:remove()
			return
		end
		self.object:set_armor_groups({immortal=1})
	end,
	get_staticdata=function() return "DISCOUPLE" end,
	on_punch=function(self, player)
		return advtrains.pcall(function()
			--only if player owns at least one wagon next to this
			local own=player:get_player_name()
			if self.wagon.owner and self.wagon.owner==own and not self.wagon.lock_couples then
				local train=advtrains.trains[self.wagon.train_id]
				local nextwgn_id=train.trainparts[self.wagon.pos_in_trainparts-1]
				for aoi, le in pairs(minetest.luaentities) do
					if le and le.is_wagon then
						if le.unique_id==nextwgn_id then
							if le.owner and le.owner~=own then
								minetest.chat_send_player(own, attrans("You need to own at least one neighboring wagon to destroy this couple."))
								return
							end
						end
					end
				end