Changing a float over time

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1

Godot Version

4.2.2

Question

Hey! I’m trying to change the speed of a car over time using a tween, but it’s not working. Here’s my current code:

var tween = create_tween()
tween.interpolate_value(speed, speed * Main.speed_mult - speed, 1, 2, Tween.TRANS_LINEAR, Tween.EASE_IN)
2

you might need pass delta value into it. Look up the delta in the godot manual.

3

Well, in case you didn’t know interpolate_value doesn’t animate anything, it simply returns a value you can use to animate it manually, it works almost exactly as lerp() and use it on _process(delta) so you’ll have to do:

var elapsed = 0.0

func _process(delta):
    elapsed += delta
    car_velocity = Tween.interpolate_value(speed, final_speed - speed, elapsed, 2, Tween.TRANS_LINEAR, Tween.EASE_IN)

Which is just ewwwww…

However I fail to understand why not use tween_property directly, on the car script call it like so:

var tween = create_tween()
tween.tween_property(self, "position", Vector2(100, 0), 2.0)

If you’re calling it from another script or parent, call it like so:

tween.tween_property($path/to/Car, "position", Vector2(100, 0), 2.0)

And modify the vector2(), or whatever you need to your pleasure.

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