Parallax scrolling issues with iPad

poopdecksweeper

Hello all,

I have a little problem with my backgrounds scrolling in my iPad game. The iPad version of my game will only spawn a new background actor (that is constantly moving left) once the first background actor's last pixel reaches the halfway mark of the screen, yet I made the rule that states that "when attribute: self.position.x < -1 then spawn actor :self.position.x+1024" (Of course the background image is 1024).

I know that I have not wrote down all of the rule, but I know that it is right because my iPhone game works perfectly. All I did to make the iPad game was to resize images and redo rules to match those changes.

Is there a bug in the iPad preview part of gamesalad? Any help would surely be appreciated.

Thanks,
Poopdecksweeper

Clouds

Why not just get rid of the 'spawning' behaviour and use a single background image moving from right to left - with the scene attribute 'Wrap X' switch on ?

Clouds

P.S in your iPhone version do you just let the background carry on moving to the left once it has left the screen or do you have a rule that destroys it once it has left the screen ?

tenrdrmer

the x position of the actor is figured from the center of the actor. So if you want to make a rule like that

you meed to have it trigger when the actor x<512 and spawn the new one at something like X=1532 though that will destroy your games performance and you should look into recycling or using wrap x on the scene.

Cheers

poopdecksweeper

I thought about wrapping X on the scene, but I have actors that spawn and move towards you on the x-axis. I don't want them to wrap as well. I tried what you said to do Tendrmer, but it is not working. The background actor doesn't spawn when you put the trigger at x<512.

Also, Tynan, I destroy the actor once it has moved past where you can see it. So at like 1024 I destroy.

tenrdrmer

it doesn't spawn at all?
Something else is wrong in your code if thats the case.

poopdecksweeper

Yea it doesn't spawn at all when I place the spawn point at 512 pixels. It is really weird and I am having the hardest time trying to figure it all out.

poopdecksweeper

Still no dice. Any other suggestions?

bluebyu25

Make sure you aren't using the "move" behavior. Use change velocity. Haven't read all your thread but that will make a difference.

poopdecksweeper

It doesn't really make a difference in what i've been trying. sorry. Is there a way to make the scene background wrap, but not the actors within that scene??