Greenfoot

Gazzzah

2012/5/2

#

I hoped to make an actor communicate to another actor using the getOneIntersectingObject method. For example, if 'projectile' collides with a 'ship' then it will 'inflict(damage);' on the ship based on the projectiles value for damage. What I've gone with is as follows: (This is in the class 'thing', it's my main parent class)

public thing hitThing;

    public boolean hit(Class clss)
    {
        hitThing = getOneIntersectingObject(clss);
        return hitThing != null;
    }

So then presumably I could tell projectile (which extends thing)

    if (hit(ship.class))
    {
        hitThing.inflict(damage); //damage being a pre-defined variable
        getWorld.removeObject(this);
    }

But the problem is that in the 'hit' method, it complains that getOneIntersectingObject applies to Actor. If I change it from 'thing' to 'Actor' then when I try to use 'inflict' it says it cannot find the 'inflict' method. Any ideas?

SPower

2012/5/2

#

You need to do this in hit(Class clss):

hitThing = (thing) getOneIntersectingObject(clss);

Because the getOneIntersectingObject returns an Actor object, you can't put it in an object from the type thing. You need to put "(thing)" before it, so you convert it into a thing object.

SPower

2012/5/2

#

And if you would change hitThing to an Actor, you haven't got the inflict method, because it's stored in the thing class, not in the Actor class. And I give you a tip: start your class names with a uppercase, that's standard in java. Java won't complain if you don't do that, but you confuse other programmers.

SPower

2012/5/2

#

And if you would change hitThing to an Actor, you haven't got the inflict method, because it's stored in the thing class, not in the Actor class. And I give you a tip: start your class names with a uppercase, that's standard in java. Java won't complain if you don't do that, but you confuse other programmers.

SPower

2012/5/2

#

Sorry for double post :(

Gazzzah

2012/5/2

#

No worries, thanks! That's helpful, and thanks for the pro tip.

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