How to make an animation with tween like resonance curve?

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, ,
1 
extends Camera2D

@export var start_y: float = -308  # Начало выше
@export var end_y: float = 320
@export var duration: float = 4.0  # 4 секунды - очень плавно

var elapsed: float = 0.0
var is_animating: bool = false

func _ready():
	position.y = start_y
	elapsed = 0.0
	is_animating = true

func _process(delta):
	if is_animating:
		elapsed += delta
		var t = clamp(elapsed / duration, 0.0, 1.0)
		
		# SmoothStep с замедлением
		var eased_t = t * t * t * (10.0 - 15.0 * t + 6.0 * t * t)
		
		position.y = start_y + (end_y - start_y) * eased_t
		
		if elapsed >= duration:
			position.y = end_y
			is_animating = false
			set_process(false)
2

Something like this should work:

extends Camera2D

@export var start_y: float = -308  # Начало выше
@export var end_y: float = 320
@export var duration: float = 4.0  # 4 секунды - очень плавно

func _ready():
	var tween: = create_tween()
	tween.set_loops()
	tween.set_trans(Tween.TRANS_SINE)
	tween.tween_property(self, "position:y", start_y, duration)
	tween.tween_property(self, "position:y", end_y, duration)

You might need to adjust some values to make it look exactly as you want it to behave.

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3

If you want to use a custom interpolator method then you need to use PropertyTweener.set_custom_interpolator() The documentation has an example.

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