Tweening a sprite to scale it UP then DOWN

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By Robster
:warning: Old Version Published before Godot 3 was released.

Hi all,

I have a sprite (a man in this case) and I want it to scale up and down just once to draw the user’s eye to it.
I tried this:

extends Node2D

onready var man = get_node("Sprite")
onready var tween = get_node("Tween")


func _ready():
	growShrinkSprite(man, tween, 2, .5)


func growShrinkSprite(spriteName, tweenName, scaleUp, seconds):

	#scale up
	tweenName.interpolate_property(spriteName, "transform/scale", Vector2(0,0), Vector2(scaleUp,scaleUp), seconds, Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
	tweenName.start()

… and it works perfectly to scale UP, but I am unsure now of how to make it scale back down again.

I tried placing another interpolate straight after like so:

tweenName.interpolate_property(spriteName, "transform/scale", Vector2(0,0), Vector2(scaleUp,scaleUp), seconds, Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
tweenName.interpolate_property(spriteName, "transform/scale", Vector2(scaleUp,scaleUp), Vector2(0,0), seconds, Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
tweenName.start()

… but that only triggers the last one. So it scales from full size down to 0. Not both, one after the other like I’d hoped.

I’ve played with a range of variations but can’t crack it.

Can anyone shed some light to help out a (insert sob story here)? :slight_smile:

4
:bust_in_silhouette: Reply From: Robster

OK I figured out a working example.
I’m happy to use it but it feels a little… cludgy.

If anyone has any suggestions for improvement just shout otherwise here is my solution for anyone in the future:

extends Node2D

onready var man 	= get_node("Sprite")#the sprite
onready var tween 	= get_node("Tween")	#the tween
var direction 		= "down"			#the initial direction
var shrinkGrowTime 	= .5

func _ready():
	growShrinkSprite(man, tween, 2, 0, shrinkGrowTime)	#start the process off

func growShrinkSprite(spriteName, tweenName, scaleDown, scaleUp, seconds):
	tweenName.interpolate_property(spriteName, "transform/scale", Vector2(scaleDown,scaleDown), Vector2(scaleUp,scaleUp), seconds, Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
	tweenName.start()

#once the tween has complete its execution and finished, start it off again, this time reversed
func _on_Tween_tween_complete( object, key ):
	if direction == "down":
		growShrinkSprite(man, tween, 0, 2, shrinkGrowTime)
		direction = "up"
	else:
		growShrinkSprite(man, tween, 2, 0, shrinkGrowTime)
		direction = "down"

For current version of Godot replace “transform/scale” with “scale”.

TGMG | 2020-07-08 22:40