Factorio Forums

Posted: **Tue Jul 21, 2015 3:52 pm**

Hey guys, Im working at a simple teleporter mod. I already did all the mechanics such as linking teleporters with a specific tool and going through the teleporters, but now I got a problem.
So I carry all teleporter links inside a table called "links". A entry inside this table looks like this: links[1] = {a=teleporter_entity_1, b=teleporter_entity_2}.
Nothing special. But now I need to break a teleporter link once I mine a teleporter. So I think the right event for that would be the On_PrePlayer_Mined_Entity cause it gives me the entity which Im going to remove, unlike the On_Player_Mined_Item . I need this entity handle to remove it from the links. So heres the code:

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game.on_event(defines.events.on_preplayer_mined_item,
	function(event)
		game.player.print(tostring(event.entity.name))
		if event.entity.name == "TeleporterEntity" then
			if isLinked(event.entity) then
				game.player.print("link detected! breaking...")
				breakLinks(event.entity)
			end
		end
	end
)

The isLinked function:

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function isLinked(teleporter)
	state = false
	for k,v in ipairs(links) do
		if teleporter == links[k].a or teleporter == links[k].b then
			state = true
		end
	end
	return state
end

The breakLinks function:

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function breakLinks(someTeleporter)
	if isLinked(someTeleporter) then
		table.remove(links, findBside(someTeleporter))
		table.remove(links, someTeleporter[1])
	end
end

So that should remove first the opposite linked teleporter with findBside and then the entity itself, and I gave it the event.entity variable coming from the event, but it keeps saying:

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Error while running the event handler: __Stuff__/control.lua:46: bad argument #2 to 'remove' (number expected, got table)

Can anybody help me? Thanks!

Edit: Oh and does anybody know how I can story the links within the map so I dont need to relink those portals at every load again?

Posted: **Tue Jul 21, 2015 4:55 pm**

The function table.remove accepts an index and removes the object at that index from the table.

Imagine you insert entity 1-5 into a table, you'll have the table

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ents = {ent1, ent2, ent3, ent4, ent5}

To remove ent3 you'll have to do table.remove(ents, 3).
The table is now:

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ents = {ent1, ent2, ent4, ent5}

To then remove ent5 you'll have to do table.remove(ents, 4).

To retain the links after a load or save you can use the 'global' table, this table is saved and restored every time the game is saved/loaded.
You could do this by replacing any reference to the 'links' table to 'global.links'.

Posted: **Tue Jul 21, 2015 5:21 pm**

ThaPear wrote:The function table.remove accepts an index and removes the object at that index from the table.

Imagine you insert entity 1-5 into a table, you'll have the table
Code: Select all
ents = {ent1, ent2, ent3, ent4, ent5}
To remove ent3 you'll have to do table.remove(ents, 3).
The table is now:
Code: Select all
ents = {ent1, ent2, ent4, ent5}
To then remove ent5 you'll have to do table.remove(ents, 4).

To retain the links after a load or save you can use the 'global' table, this table is saved and restored every time the game is saved/loaded.
You could do this by replacing any reference to the 'links' table to 'global.links'.

Wow really thanks! Now my breaking function:

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function breakLinks(someTeleporter)
	if isLinked(someTeleporter) then
		table.remove(links, arrayGetIndex(links, findBside(someTeleporter)))
		table.remove(links, arrayGetIndex(links, someTeleporter))
	end
end

and the array get index:

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function arrayGetIndex(array, item)
	for k,v in ipairs(array) do
		if v == item then return k end
	end
	return nil
end

Just writing for maybe further users with this question. About saving and loading, I will post when I updated my script!

OK did it now, but I get this error: Error while running the event handler: __Stuff__/control.lua:31: bad argument #1 to 'ipairs' (table expected, got nil)
at line 31this is called:

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	for k,v in ipairs(global.links) do

Posted: **Tue Jul 21, 2015 5:37 pm**

In the on init and on load events write line like this:

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global.links = global.links or {}

It will initialize the global.links table if it's not yet initialized.

Posted: **Tue Jul 21, 2015 5:44 pm**

orzelek wrote:In the on init and on load events write line like this:
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global.links = global.links or {}
It will initialize the global.links table if it's not yet initialized.

Great thanks! Now will do all that multiplayer related stuff like changing game.player into game.players[event.playerindex]

Posted: **Tue Jul 21, 2015 6:31 pm**

So I have another problem with my teleporter mod... How do I make this function for multiplayer?
So the main functions with teleporting are made inside the ontick event, but that does not give the playerindex back, so how do I get the player(index) to make things with him?

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On_PrePlayer_Mined_Entity entity cannot be table.removed?

On_PrePlayer_Mined_Entity entity cannot be table.removed?

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Re: On_PrePlayer_Mined_Entity entity cannot be table.removed?

Re: On_PrePlayer_Mined_Entity entity cannot be table.removed?

Re: On_PrePlayer_Mined_Entity entity cannot be table.removed?