Greenfoot

USBest

2012/6/4

#

Is there a method like 'addedtoWorld(World W)' just for removing an object?

kiarocks

2012/6/4

#

No, there isn't.

USBest

2012/6/4

#

And how can I let something happen if an object is removed?

USBest

2012/6/4

#

Can't anyone help me?

davmac

2012/6/4

#

You can just add additional logic in the code which removes the object:

   world.removeObject(actor);
   // do other stuff here...

SPower

2012/6/6

#

You can overwrite removeObject doing this:

public void removeObject(YourActor object)
{
     super.removeObject(object);
     object.removedFromWorld(this);
}

Add that method to MyActor, and you're done! Note that this will only work on MyActor objects or subclasses of it.

USBest

2012/6/6

#

I get the message: 'cannot find symbol - class YourActor' I changed it to MyActor and the I got the message: 'cannot find symbol - method removeObject(MyActor)'

SPower

2012/6/6

#

You must replace the class YourActor by the class you want removedFromWorld to be invoked on, of course!

USBest

2012/6/6

#

I still get the warning: 'cannot find symbol - method removeObject(Menu)'

SPower

2012/6/6

#

The place where you call it, you have to cast the getWorld to your own subclass of world, like this:

MyWorld w = (MyWorld) getWorld();
w.removeObject(Menu);

where you have to replace MyWorld with your own world. Does this help?

USBest

2012/6/6

#

Well My code is now:

public void removeObject(Menu object)
{
     world world = (world)getWorld();
     world.removeObject(object);
     object.removedFromWorld(this);
}

I get no error, but it don't work...

SPower

2012/6/6

#

??? You have to overwrite the method removeObject in your subclass of world, like this:

public void removeObject(YourActor object)  
{  
    super.removeObject(object);  
    object.removedFromWorld(this);  
}

With my previous post, I thought you were programming in your Actor class :) It should work fine now, if you ignore my previous post :)

SPower

2012/6/6

#

If you still get an error, this might work:

super.removeObject((Actor) object);

in the removeObject method in your own world.

USBest

2012/6/6

#

I did. Now I've got in my world class:

public class world  extends World
{   
    private int MouseX=0,MouseY=0;
    private static int MouseScroll=0;

    public world()
    {    
        super(600, 600, 1); 
        Objects(new Beam());
        CreateMenu();
    }

    public void removeObject(Menu object)
    {  
        super.removeObject(object);  
        object.removedFromWorld(this);  
    }
    [...]
}

But it still don't work, when I press the close Button:

    public void act()
    {
        if(Greenfoot.mouseClicked(this) && getWorld().getObjects(Menu.class).size()>0)
            getWorld().removeObject(getWorld().getObjects(Menu.class).get(0));
    }

There is just removed the menu and not the buttons on it...

SPower

2012/6/6

#

Can you show me the removedFromWorld method?

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