Greenfoot

Benedict

2012/6/15

#

hi everyone, i got a problem (again) the following method in my scenario isn´t working:

public void getHurt()
    {
        setImage("death.PNG");
        Greenfoot.delay(4);
        getWorld().removeObject(this); 
    }
        
    public void die()
    {
        Actor a = getOneIntersectingObject(Ninjastar.class);
        if(a != null)
        {
            getHurt();
            getWorld().removeObject(a); 
        }
    }

thanking you in anticipation(for the hundred and first time ;) )

Benedict

2012/6/15

#

forgot to say what is not working :) if the Ninjastar "touches" the terrorist he s not disappearing

erdelf

2012/6/15

#

I dont really see why it shouldn't work, did you call the die method in act? If so, what happens, I mean happens anything?

Benedict

2012/6/15

#

yea, but every time the star tocuhes the actor there is a greenfoot error that says this : java.lang.NullPointerException at Terrorist.die(Terrorist.java:66) at Terrorist.act(Terrorist.java:23) at greenfoot.core.Simulation.actActor(Simulation.java:565) at greenfoot.core.Simulation.runOneLoop(Simulation.java:523) at greenfoot.core.Simulation.runContent(Simulation.java:213) at greenfoot.core.Simulation.run(Simulation.java:203) java.lang.NullPointerException at Terrorist.die(Terrorist.java:66) at Terrorist.act(Terrorist.java:23) at greenfoot.core.Simulation.actActor(Simulation.java:565) at greenfoot.core.Simulation.runOneLoop(Simulation.java:523) at greenfoot.core.Simulation.runContent(Simulation.java:213) at greenfoot.core.Simulation.run(Simulation.java:203) java.lang.NullPointerException at Terrorist.die(Terrorist.java:66) at Terrorist.act(Terrorist.java:23) at greenfoot.core.Simulation.actActor(Simulation.java:565) at greenfoot.core.Simulation.runOneLoop(Simulation.java:523) at greenfoot.core.Simulation.runContent(Simulation.java:213) at greenfoot.core.Simulation.run(Simulation.java:203)

TimbooXD

2012/6/15

#

remove line 14. getWorld().removeObject(a); and then compile that should work

Benedict

2012/6/15

#

thx, it worked :)

erdelf

2012/6/15

#

damn. didn't saw this

TimbooXD

2012/6/15

#

erdelf can you help me

erdelf

2012/6/15

#

whats your problem?

TimbooXD

2012/6/15

#

http://www.greenfoot.org/topics/1730

TimbooXD

2012/6/15

#

http://www.greenfoot.org/topics/1730

Benedict

2012/6/15

#

lol, im freaking out, another error: and i have no idea why: 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. at greenfoot.Actor.failIfNotInWorld(Actor.java:663) at greenfoot.Actor.getOneObjectAtOffset(Actor.java:867) at Terrorist.canSee(Terrorist.java:72) at Terrorist.attack(Terrorist.java:78) at Terrorist.act(Terrorist.java:24) at greenfoot.core.Simulation.actActor(Simulation.java:565) at greenfoot.core.Simulation.runOneLoop(Simulation.java:523) at greenfoot.core.Simulation.runContent(Simulation.java:213) at greenfoot.core.Simulation.run(Simulation.java:203) i still have no idea what this will mean :(

erdelf

2012/6/15

#

code of the following methods from the Terrorist class: act() attack() canSee()

danpost

2012/6/16

#

You are probably calling a method from the 'act' method, before the call to 'attack', where you are removing 'this' from the world'. Immediately after that method call, in the act method, that removes 'this' from the world, add the following line:

if (getWorld() == null) return;

Benedict

2012/6/16

#

it doesnt work and matter anymore, my teacher has the project already, but anyway, thank you all for your help :)

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