Quick Question

Use keypress detection (see 'Greenfoot' class API) and comparison of limits (high and low values) to the y-coordinate of the object's location (see 'Actor' class API) to control the movement coded in the 'act' method of the aforementioned 'actor' class. After trying to put some code together, if you are still having problems, post what code you have that you need help on.

I lost you on "(see 'Greenfoot' class API)". Could you possibly give me an example code?

Near the top of this webpage in the green banner, there is a link to 'Documentation'. The top section on the right of the new page, you can click on 'online' to go to the APIs which show what methods are available in each available class in the 'greenfoot' package (made available by the 'import greenfoot.*;' statement at the top of each class' code). You can search through these APIs to determine which methods would be useful to accomplish your goal. Scrolling is not something that should be tackled by someone with little experience in programming. However, there are some demos and support classes available on the site that may come in handy for that purpose. Some are included within my Demos collection and my Support Classes collection.

I did not say you should not use scrolling. I was suggesting that you look over some code with scrolling in it, try to understand what it does before trying to implement your own scrolling; or use a scrolling support class for your world. Without knowing the particulars of your scenario, I could not say what possible complications might arise. Also, you did not say whether it would be vertically limited or infinite; but because you say you are using a map, my guess is limited. Using my 'Scrolling SuperWorld' support class might be the way to go.

Let me clear things up about the game. I have everything working fine, its just the map is to large to fit on the screen. So to see the rest of the map, you have to scroll. So, ingame as you control your actor, if it goes to the section of the map that you must scroll to, you must scroll along the screen as you play. So what I want is that in automatically scrolls for you as you play. But I don't know the code for that. If you could give me it, that would be amazing and I would give you credit when I release the game.

First of all, are you scrolling only horizontally, or vertically as well? One way you can think about it is moving the world around the player. So when you press Left, everything moves right. If you want something more advanced, feel free to take stuff from my project. (http://www.greenfoot.org/scenarios/6857) You'll find the relevant code in the RelativeActor, PlatformingWorld, and Camera classes.

Download my 'Scrolling SuperWorld' scenario and copy/paste the complete 'SWorld' class code into a new sub-class of World (replacing anything created in that new world). Then make your original world 'extend SWorld' instead of 'extend World'. Open up the code for the 'SWorld' class and complete the directions given there. The movement code for your hero should not be changed; but once you 'setMainActor' your hero in 'SWorld', the scrolling should work. Also, once you 'setScrollingBackground' your background image, it should scroll, too. Once the scrolling is working, please 'like' my scenario.