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Asked By | indy2005 |
Hi
I am trying to make a sprite pulse, but it expands then contracts but does not repeat. It would be great to have a “Ping Pong” option in Godot (Construct 3 has it, and it is very useful).
What am I doing wrong, it seems that once “completed” has fired for a tween instance, it doesn’t get fired again? Either that or I am scaling from 1.0 to 1.0 for some reason.
I have added 2 tweens to the node for now, TweenExpand and TweenContract - and when one completes, I initiate the other so it should expand and contract. At the moment, it does it only once (expand->contract->stop).
func _ready():
# When a balloon is created, we choose a color from one of the animations
# and we set a random rotation
# and we tween the scaling up and down by a random amount
add_to_group("balloons")
var rng = RandomNumberGenerator.new()
rng.randomize()
tweenScale = rng.randf_range(1.1,1.8)
tweenTime = rng.randf_range(1.2,2.0)
tweenExpand.interpolate_property(self, "scale",
self.scale, Vector2(tweenScale, tweenScale), tweenTime,
Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
tweenExpand.start()
var animation_index = rng.randi_range(0, len(animations)-1)
anims.animation = animations[animation_index]
anims.frame = 0
anims.stop()
func _on_TweenExpand_tween_completed(object, key):
tweenContract.interpolate_property(self, "scale",
self.scale, Vector2(1.0,1.0) , tweenTime,
Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
tweenContract.start()
func _on_TweenContract_tween_completed(object, key):
tweenExpand.interpolate_property(self, "scale",
self.scale, Vector2(tweenScale, tweenScale), tweenTime,
Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
tweenExpand.start()
Only thing I can think of is your tweenContract signal is not properly connected. It should work on the first look as you expect.
Btw you don’t need new RandomNumberGenerator for float range, there is a rand_range function available.
And for clarity… you may call _on_TweenContract_tween_completed in func _ready, so you DRY 
Reloecc | 2020-09-16 09:15
But it does contract once, it just doesnt ever expand again. So it must be connected correctly to contract at all. Not sure what you mean by call it in _ready? Its a signal, why would I call it manually?
indy2005 | 2020-09-16 12:02