creating signals between scenes

[silk lodge]

Anyone know how to make it so i can receive a signal from one scene to another?

I'm trying to make it so that when ship1 collides with the meteor it sends out a signal to LevelScript

so that LevelScript can know when ship1 has been destroyed

[bold sigil]

In your first script you might want to emit the signal before calling queue_free

and in the second one, you can use a better syntax that will ensure the signal and your method exists : ship1.ship_death.connect(ship_death_test)

the analyser will check that the signal exists on the ship1 instance and that the method you connect it to exists too

[silk lodge]

alright so ive changed it up and when i run the game it says:

Invalid call. Nonexistent function 'find_node' in base 'Window'.

could be a problem here

[bold sigil]

yeah, that's not really the best way to do this. You probably want an event manager that will handle the signal so the two nodes don't have to reference each other

Basically, you would need an autoload (let's call it EventManager) that declares a signal ship_death(ship)
Then in your level script, do EventManager.ship_death.connect(_on_ship_death) with a method func _on_ship_death(ship)
and when your ship dies it just needs to call EventManager.ship_death.emit(self) and the level will be notified

(sorry, I'm going fast, but I've got to go)

[silk lodge]

hmm it just breaks if i set ship1 as an autoload tho

[bold sigil]

what ? no don't do that

but your level script should not need to reference the ship, it can just be passed as an argument of the signal callback

[silk lodge]

ah my bad, I'm fairly new to godot, so which exactly do i use as an autoload?

[wise herald]

create a new script

this is just used as an event bus to emit events to

and then since its autoloaded , any script can listen to the events from anywhere

by connecting to them using connect

[silk lodge]

so do i create a new scene and script and have it autoload?

[wise herald]

go to the autoload menu and select the .tscn file

and add it as an autoload

[silk lodge]

alright so ive set it up as this now with the autoloaded tscn

it prints this out

i havent wrote anything in the new script file as well

[wise herald]

you need to create the signal

signal ship_death(ship)

in the eventbus script

[silk lodge]

alright

[wise herald]

yeah well the function is not needed

but yeah thats it

also connect without () at the end

connect(_on_ship_death)

[silk lodge]

wait so should on_ship_death be on Eventbus or Levelscript?

Eventbus script looks like this:

ship1 script looks like this:

and Level script looks like this:

[wise herald]

on level script

remove the () inside the connect

you want to use the function like a variable

not call it

[bold sigil]

also _on_ship_death should take an argument

because the ship will send itself to it

and it should be signal ship_death(ship) (even better with types, but one topic at a time)

[silk lodge]

let's gooo i got it to work :))

thanks guys

[bold sigil]

cool 🙂