Greenfoot

Tupac

2014/1/20

#

Hello, this may sound as a very basic question but Im only just starting. I don't want people to shoot at no interval, so how do I set an interval? So for example; if people shoot 2 times, there should be a reloading time. How do I program this in the following?

        if ("space".equals(Greenfoot.getKey()))
        {
            fire();
        }
        if ("space".equals(Greenfoot.getKey()))
        {
            XXXX
        }

Thanks in advance

kiarocks

2014/1/20

#

You'll want a counter that gets set when people fire, so declare a variable, let's call it "FIRE_INTERVAL", in your actor class like so:

static final int FIRE_INTERVAL = 100;

'static' means that it will be shared over every actor, and 'final' makes it so it doesn't get changed from what you set it to. Declare another variable called 'fireCountdown':

int fireCountdown = 0;

in your actor class, and when someone fires set it to FIRE_INTERVAL:

            fire();
            fireCountdown = FIRE_INTERVAL;

Then, put this in the act() method:

if (fireCountdown > 0) {
    fireCountdown--;
}

so the variable goes down. Finally, change

("space".equals(Greenfoot.getKey()))

to

("space".equals(Greenfoot.getKey()) && fireCountdown == 0)

so that it only lets people fire when fireCountdown is 0. That should do it!

Tupac

2014/1/26

#

It works, but I can only fire once. So may I ask you: how do I set the interval?

davmac

2014/1/26

#

Don't use Greenfoot.getKey() for this. Use Greenfoot.isKeyDown(...).

Tupac

2014/1/26

#

davmac wrote...

Don't use Greenfoot.getKey() for this. Use Greenfoot.isKeyDown(...).

This solves the problem, thanks!

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