Coin Collector: Collected

Part of the Signals and Collisions section of Coddy's Godot journey. Lesson 25 of 27.

main.gd holds the game's rules, like how many coins are left. Main has to hear about every coin you take. So each coin sends a signal, and Main listens to all of them.

In coin.gd, declare signal collected and emit it just before the coin frees itself:

if body.is_in_group("player"):
	collected.emit()
	queue_free()

In main.gd, connect every coin in the group, as you did with the spikes:

for coin in get_tree().get_nodes_in_group("coins"):
	coin.collected.connect(_on_coin_collected)

This works in Main's _ready() because Godot readies children before their parent. By then every coin has joined the group.

Challenge

Medium

Two scripts this time:

coin.gd: declare signal collected and emit it before queue_free().
main.gd: in _ready(), connect every coin's collected to a new function _on_coin_collected() that prints Got a coin!.

Try it yourself