Greenfoot

SPower

2012/7/14

#

To talk about erdelfs post about a more precise location setter, you're not really using exactX or exactY. You actually must add their getters:

public double getExactX()
{ return exactX; }

public double getExactY()
{ return exactY; }

or just remove them: they're not used anywhere except for in setLocation

KommandoFaust

2012/7/15

#

Is there any other method than this,

if(Greenfoot.getRandomNumber(4) == 0) {  
        //call addObject method  
    }

to let objects randomly appear? Won't give me an error, but the objects won't appear either. Or should I add a location to it, maybe this would do the trick?

erdelf

2012/7/15

#

well, try this for the random appearing

if(Greenfoot.getRandomNumber(10) == 5)
{
     int x = Greenfoot.getRandomNumber(getWidth());
     int y = Greenfoot.getRandomNumber(getHeight());
     addObject(new Dummy(), x, y); // change Dummy to your class
}

if you have questions for this airforce game, check out my Scenario , it is the same kind of game so I think it should help you

KommandoFaust

2012/7/15

#

Danke für diene Hilfe, bist echt ein Elf´!

KommandoFaust

2012/7/15

#

One problem solved, more to add :) . Got huge amount of the objects appearing everywhere on the screen... but I need them to appear on the top edge, and can you set a limit to the objects, so that there isn't 100++ units at the same time on the screen?

MatheMagician

2012/7/15

#

if(getObjects(null).size() < 100)
        addObject(new Enemy(),Greenfoot.getRandomNumber(300)+100, 0);

danpost

2012/7/15

#

To have them appear at the top edge of the screen, change erdelf's line 4 to

int y = 0;

or a moderately low number (so the objects are not half cut by the top edge of the screen).

SPower

2012/7/15

#

To explain: the getObjects(null) returns a list of all the actors in the world. If it's size (the number of actors in it) is less than 100, a new Enemy objects is added.

danpost

2012/7/15

#

There is also a World method 'numberOfObjects()' which returns the number of objects in the world.

KommandoFaust

2012/7/15

#

Thank you all, it will do the trick.

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