minetest.git - modified minetest for gpcfs purposes

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-- atc_rail.lua
-- registers and handles the ATC rail. Active component.
-- This is the only component that can interface with trains, so train interface goes here too.

--Using subtable
local r={}

function r.fire_event(pos, evtdata)
	
	local ph=minetest.pos_to_string(pos)
	local railtbl = atlatc.active.nodes[ph]
	
	if not railtbl then
		atwarn("LuaAutomation ATC interface rail at",ph,": Data not in memory! Please visit position and click 'Save'!")
		return
	end
	
	
	local arrowconn = railtbl.arrowconn
	if not arrowconn then
		atwarn("LuaAutomation ATC interface rail at",ph,": Incomplete Data! Please visit position and click 'Save'!")
		return
	end
	
	--prepare ingame API for ATC. Regenerate each time since pos needs to be known
	--If no train, then return false.
	local train_id=advtrains.get_train_at_pos(pos)
	local train, atc_arrow, tvel
	if train_id then train=advtrains.trains[train_id] end
	if train then 
		if not train.path then
			--we happened to get in between an invalidation step
			--delay
			atlatc.interrupt.add(0,pos,evtdata)
			return
		end
		local index = advtrains.path_lookup(train, pos)
				
		local iconnid = 1
		if index then
			iconnid = train.path_cn[index]


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