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Another Node's Signal

Part of the Signals and Collisions section of Coddy's Godot journey. Lesson 9 of 27.

A script can also listen to another node's signal. Get the node with $, then connect its signal:

$Switch.body_entered.connect(_on_switch_body_entered)

This reads: when Switch sends body_entered, call _on_switch_body_entered. The function is in this script, so it can use this script's nodes, like $Light.

Games are often wired this way. One main script connects the switch, the light and the door, and each of those stays simple. Godot names such functions _on_, then the node, then the signal.

challenge icon

Challenge

Easy

Make the switch turn the light on.

  1. In Main's _ready(), start a line with $Switch.body_entered.
  2. Connect it to _on_switch_body_entered.

Press Play and step on the green switch: the light comes on. Then Check.

Try it yourself

extends Node2D

func _ready():
	pass

func _on_switch_body_entered(body):
	$Light.visible = true

All lessons in Signals and Collisions

1Areas

Areas Notice BodiesConnect a SignalWho Walked In?Only the PlayerLeaving an Area

4Removing Things

Remove a NodeA Door That OpensCoins LeftClear the Path

2Signals

Areas Meet AreasYour Own SignalSignals With ValuesAnother Node's SignalListen to Your Signal

5Hazards

Spikes Send You BackA CheckpointMany Spikes, One FunctionLayers and Masks

3Groups

Join a GroupIs It in the Group?Every Node in a GroupCount a Group

6Project: Coin Collector

Coin Collector: WalkCoin Collector: CoinsProject lessonCoin Collector: CollectedProject lessonCoin Collector: Coins LeftProject lessonCoin Collector: You WinProject lesson

Practice on your own: Godot playground