every time I shoot a smaller yellow ball the game freezes plz help, source code:http://www.greenfoot.org/scenarios/6065
Game/maniac wrote ...
2012/10/6
I need help, again!
i think your trying to use the astroballs varibels but its been removed from the world
I dont think that's what is causing it
btw your game is very good i like it a lot
one comment is that the window its played in is soo large it made made firefox almost crash
and ive got a widescreen screen
ok ill make it a bit smaller
I recommand the way fix the problem.
In subclass of World in your cord, declare 'Counter counter' in class but not in method.
and add "counter = new Counter()" in Constructor Method. (In your class, public Worldy() method)
and then do addObject in Constructor Method, too. After that, correct AstroBall class.
Do not declare 'counter' in the class, and use following form:
((Worldy)getWorld()).counter.add(5)
If you use that form in destroy method in AstroBall class, It may not pop up NullPointerException.
It now says cannot find symbol - variable counter
If you hit the AstroBall with your bullet it is removed and four new AstroBalls are added to the world. But look at the construktor. You use a constructor in which no counter is given to the object and if you now try to use a method of this counter you get the nullPointerException.
To fix the problem you should change this constructor maybe this way:
Now you have to change the method which adds the balls to the world:
Then it should work.
public AstroBall(int direction, int health, Counter pointCounter) {
setRotation(direction);
hp=health;
getImage().scale(getImage().getWidth()-health,getImage().getHeight()-health);
counter = pointCounter;
}//in the method destroy;
if(nhp<50){
getWorld().addObject(new AstroBall(315, nhp, counter),getX()+10,getY()-10);
getWorld().addObject(new AstroBall(45, nhp, counter),getX()+10,getY()+10);
getWorld().addObject(new AstroBall(135, nhp, counter),getX()-10,getY()+10);
getWorld().addObject(new AstroBall(225, nhp, counter),getX()-10,getY()-10);
}Its fixed now
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