Screen wrapping based on alterable value

[EE]

It's 03:19 am, so forgive me if the solution is obvious.

I have an object with two alterable values; Ypos and Yvel.

The event in question; If Yvel<> 0
-Set Ypos -> (Ypos+Yvel) mod 480
-Set Y -> Ypos

That works like a charm, but only when Yvel is a positive value i.e the object leaves the screen at the bottom.

How on earth (or in space) do I set it up so it works in both directions?

I'm stumped!
//EE

[RickyRombo]

Don't use mod. Just do:

Yvel<>0
- Set Ypos-> Max(0, Yvel/abs(Yvel)*480)

or something.

[EE]

Nope.
Doesn't work.
Thanks though!

[RickyRombo]

What does it do/What do you expect? What are you trying to achieve?

[EE]

Ha! Just realized that I didn't state what I was aiming for in the initial post!

I'm trying to make an object wrap around the screen if it leaves it on the top or bottom(the screen edge, not the frame). The problem is that the object has a variable velocity, making me have to tell it what coordinate to position at. You can think of it as a scrolling background without moving any objects but the background.

As I said, it works perfectly when objects leave the screen bottom, the 'Mod' makes the Xpos value wrap nice. However, when Xpos<0 the mod function can't wrap it properly.

Hope I was clear!

[Jacob]

-Set Ypos -> (480+Ypos+Yvel) mod 480

[EE]

Ha ha.. ah-ha.. ^__^

So simple! Why didn't I think of that?

Thanks!

//EE