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An implementation of a way to scroll through a world too big to fit on screen.
The important classes are ScrollWorld and ScrollActor, so you would do well to read the documentation of those two classes. If you've got further questions, you may leave a comment here (though please, don't post full code here: do that in a discussion).
As a demo, I made a bug that walks around in the world. It is controlled with your mouse and the up/down keys. Feel free to use the demo code in the Bug class, as all of the movement code is in there.
You're free to use this in your own games, but if you do so, I would appreciate giving credit as to where you got the scrolling code from.