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davemib123
davemib123 wrote ...

2012/9/29

creating a powerup

davemib123 davemib123

2012/9/29

#
hi all, how would I go about creating powerup to give dual missles? I know how to insert the powerup on the screen and how to collect it. But how would I go about firing two missiles for about 20 seconds and then revert the hero back to normal. This is my scenario if you want to take a look which has just single missile fired: http://www.greenfoot.org/scenarios/5799
danpost danpost

2012/9/29

#
To accomplish this, you will need two instance variables: one boolean and one int. The boolean will track whether the powerup is active or not; the int will act as a timer. The code will need to be in the hero's class. 
// instance variables
boolean dualMissleActive;
int dualMissleTimer;
// in act method
checkDualMissles();
// add new method
private void checkDualMissles()
{
    if (!dualMissleActive && whateverConditionsRequiredToActivate == true)
    { // activate powerup
        dualMissleActive = true;
        dualMissleTimer = 1000; // adjust to suit
    }
    if (dualMissleActive && dualMissleTimer > 0)
    { // deactivate powerup
        dualMissleTimer--;
        if (dualMissleTimer == 0) dualMissleActive = false;
    }
}
Once this code is set up, you will need to adjust your checkFiring code to see 
if (dualMissleActive)
and fire two, instead of one, when firing.
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