I came up with a solution for a sequenced tween issue I was having!

This forum has been an invaluable resource for me so I am posting this in an attempt to "give back" to the community. (This technique might be used by many of you already but perhaps it will be new to some. It was new to me!)

The Problem:

My game has 20 or so instances of a card on the screen. To spin the card I have to sequence multiple tweens together, like this:

- Get UID of clicked on card

- Tween xscale from 1 to 0

- If tween is finished --> change sprite image to back

- Tween xscale from 0 to 1

- If tween is finished --> change sprite image to front

But because there can be multiple tweens happening at the same time the logic was getting confused. For example, before the first tween sequence had completely finished the player might have picked a new card. Now my "On finished" event would reference the wrong instance!

My Solution:

When I create a tween I now tag it with the UID of the card that was clicked on. Then I can pick the correct card by parsing the tag.

The player clicks on a card:

-> fam_cards: Tween "spin1_" & fam_cards.UID property X Scale to 1...

Then I can simply check:

+ fam_cards: On Tween "spin1_" & tokenat(fam_cards.Tween.Tags,1,"_") finished

+ System: Pick fam_cards by evaluating fam_cards.UID = int(tokenat(fam_cards.Tween.Tags,1,"_"))

I'm waiting for one of the experts to tell me, "You are WAY overcomplicating things. All you need to do is..."

;-)

If it works, it works and it seems to make sense to you so I say stick with it.

You are WAY overcomplicating things. All you need to do is...

wackytoaster.at/parachute/cardflip.c3p

At least that's roughly how I'd do it. But there's obviously more than one way to get to the goal. I've used something similar to your method before for something else, where I stored the UID in a tag.

I mean if you’re after alternative ways to flip cards, here’s a way with two instance variables: target and spin.

On card clicked
— card: set target to 180-self.target

Every tick
— card: set spin to lerp(self.spin, self.target, exp(-16*dt))
— card: set width to self.imageWidth*cos(self.spin)
— card: set animation to self.width>0?”back”:”front”

Oh yeah, I'm on the beta branch. You can just open it in the newest beta if you want to take a look.