Are you using a scrolling engine? If not you can use my Infinite Scrolling World. I think this engine should do exactly what you want.

This would also be useful: http://www.greenfoot.org/scenarios/5806 You can just choose which engine you find the easiest or most powerful.

Basically, you have two types of Actors; those that should scroll and those that should not. Your scrolling engine needs to be able to distinguish between the two. The easiest way is to subclass all the classes that create scrolling objects under one super actor class 'Scroller'. Then adjust your engine to move objects listed as 'Scroller' objects instead of all objects. As an alternative, you can use a List and add all scrolling objects into the list instead of superclassing the scrollers; and use that list in your scrolling engine.

Thank you :) ! Although my game is starting to get pretty complex, i will try to implement it in , hopefully it's still possible. I will let you guys know soon :) . Oh and my screen is not infinite though, i do have portals with multiple worlds.. But i assume that i can adress that somewhere in the code.. I will post updates on this issue here :) .

Okay so i tried all night, (using SPower's scenario) to try and convert my own project. Everything seems fine at first when i start my game ( Awsome ! ): However, if i press one key :( it all goed to sh*t... Enemies fall trough the floor, walk in the sky, i also teleport to the floor and i can't get out of it ! What's going on here? And i will be happy to post code if needed, it's alot of code though.. Thank you guys in advance, and i hope we can resolve this issue. Getting there though !

I think your game is a platformer right? So if your enemys seem to ignore the platforms and go through them you should post the code of the enemies and the platforms (an the class where the enemies check whether there is a platform if this is not the enemy class). But I don't realy get what you mean by enemies walking in the sky. Could you explain that a bit more prezise? To help you with your second problem you need to post the code of your teleporter and maybe the world class if the teloporting system is connected to the world.

Hi Guys :) Ok let's post some info ! And i might see how this is, It's not that my enemies fall trough the floor, but my background is the only thing that's moving .. not my map itself. I will try to explain this as precisely as i can for you guys :) First, What's Happening ??: On Game startup (looks fine ) ( i've colored the floor for you guys ) : I Use a background image and invisible platforms to walk on When i move : All all that's moving is the background, not the platforms... Now to show some of my classes : Current world im using : Some of my classes : ( Please note, the mover class is the mover class provided by greenfoor support classes) And now for my code ! Class ScrollWorld Rogue Char My TrainingGround World And last but not least.. My Platform Class

Ok i've done that :) that works a little better right now.... However, my background ( which worked fine before trying to implement the ScrollWorld ) is still jumping around and.. especially when i hit the corner of the map.. or the area i can or cannot go ( still stops mid air) Or sometimes i fall trough the floor at this point :( it doesnt look good What's going on here :( ? EDIT : If there is ANYTHING you need to help me out, just say so.. i really need to fix this !

You probably want the worlds background to move the same distance as your world objects right? But how is the world moving currently? On the photos it seems like the background is the only thing that is moving and not the platforms. I unfortunately have never workes with this scrolling engine but after having a look on the code I think the problem could be that all the objects you add to the world are cameFollowers for the scrolling world. probably you are always using this addObject method: public void addCameraFollower(ScrollActor cameraFollower, int x, int y) instead of this method: public void addObject(Actor object, int x, int y) what makes all your actors camaraFollowers. I think that would explain why they are not moving. If every actor is a camaraFollower the scrolling world tries to follow every actor and does not scroll. To fix this you could try casting your objects to Actors before adding them to the world (addObject((Actor) new ScrollActor(), ...); But this is just a suggestion because I don't realy know how this engine works. So I'm not shure if this will fix the problem. You'll have to try.

My biggest issue at this point is that my background is getting kinky as as soon i move.. when i start the game, it's all fine bus as soon as i touch a key, the whole background "misplaces" itself and it looks like im walking underground ( you can check out my last 3 screenshots ).. All the mobs work fine ! I had that problem before and then i subclassed all "movers" underneath ScrollActor, :) That's working fine !

Random Question, but is the background as big as the whole map? I'm not exactly sure what's going on, but that may be a problem if its not as big as your world size (not the screen size).

I've made a short video guys :) i thought that would be best !! When i start the game, you can see the platforms match my background , but when i move... the background "skips" and all my game is messed up .. I Can also fall out of my screen :( If you guy's like the video to explain problems, i'd be glad to use it more often :) Thanks in advance :)