Discussions

The format of any method call in OOP (object-oriented progamming) is object.action. If there is no object supplied, then it is assumed to be the 'this' keyword, which refers to the object created from that class the method is in. For a sound, a GreenfootSound object is the object and 'play' is the action you wish to have it do. So, create a GreenfootSound object using the GreenfootSound constructor call and save it in a GreenfootSound field. Then when you want to 'make noise', name the sound and action to perform.

It's exactly what i was looking for. thx

I had supplied this yesterday. Line 10 was trying to tell you that the world saved in 'gameWorld' needs to be passed along from world to world until you finally return to it by using the code on line 13.

I was thinking something along these lines: (1) start the loop (iterate 5+ times) -- 5 (set part) plus a random amount more (random part) (2) create a new Orb -- the orb constructor can assign random velocity -- the orb constructor can also assign a random size (3) use size of orb created to determine the limits of location placement in the world -- the size of the world minus the size of the orb is the range (random part) -- the added offset is half the size of the orb (set part) (do the above for both horizontal and vertical dimensions) (4) add the orb

It seems you are trying to make things so much more difficult than they have to be. All the 'spawn' methods and references are probably confusing you to death. You need to keep things simple to start. Stick with the constructors and act methods. You can always refactor the code later (moving lengthy duplicated code into methods; and breaking down the basic steps taken in the act method into sub-methods, only if the 'act' method is excessively long). I want to tell you to just delete all the 'spawn' methods and references; but, then we would be starting almost from scratch again. One th

here is my manifest

Thank you!

Replied to in the 'Still and Moving Objects' discussion.

]Ok well I think I fixed it

Thanks Danpost

Thank you so much for your help! That was quite amazing! :D

Thanks for all the help, I believe it is really close to working now, but I can't spawn my gravity beam because it doesn't exist in the world yet. "java.lang.IllegalStateException: Actor not in world. An attempt was made to use the actor's location while it is not in the world. Either it has not yet been inserted, or it has been removed." I thought of spawning a few of them out of sight, and then moving them to the location when asked, but I thought that there should be an easier and better way of doing this. Do you know a better way?