//when killing a Zombie
((MyWorld) getWorld()).spawnZombie(2);

//in MyWorld - your world, rename if needed
public void spawnZombie(int numZombies)
{
    for (int i=0; i<numZombies; i++)
    {
        Zombie z = new Zombie();
        addObject(z, Greenfoot.getRandomNumber(getWidth()), Greenfoot.getRandomNumber(getHeight()));
        if (z.tooNear())
        {
            i--;
            removeObject(z);
        }
    }
}

//in Zombie
public boolean tooNear()
{
    return !getObjectsInRange(100, Player.class).isEmpty(); //100 is the range around the Player where no zombie should be placed. adjust as needed
}

if (getObjects(Zombie.class).size() < 20+kills/3) spawnZombie(1);

// instance fields
private int zombieLimit = 20;
private int kills;

// in action code
if (getObjects(Zombie.class).size() < zombieLimit)
{
    kills++;
    if (kills%3 == 0) // every 3 kills
    {
        zombieLimit++; // increase limit on number of zombies allowed in world
        spawnZombie(1); // spawn an extra one due to increase in number allowed
    }
    spawnZombie(1); // spawn one for the kill
}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class MyWorld here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class MyWorld extends World
{
    HealthBar healthbar = new HealthBar();
    
    /**
     * Constructor for objects of class MyWorld.
     * 
     */
    public MyWorld()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(1300, 800, 1); 
        addObject(new GoodGuy(), 650,400);
        addObject(healthbar, 300, 100); 
       
        
        spawnBadGuys(20);
        
        
        
    }
    
    private int BadGuysLimit = 20;
    private int kills;
    
    public void act()
    {
        kills();
    } 
    
    public void kills()
    {
        if (getObjects(BadGuys.class).size() < BadGuysLimit)
		{
    		kills++;
    		if (kills%3 == 0) // every 3 kills
    		{
        		BadGuysLimit++; // increase limit on number of zombies allowed in world
        		spawnBadGuys(1); // spawn an extra one due to increase in number allowed
    		}
    		spawnBadGuys(1); // spawn one for the kill
		}
    }
    
    public HealthBar getHealthBar()
    {
        return healthbar;
        
    }
    
    public void spawnBadGuys(int numBadGuys)
    {   
        for (int i=0; i<numBadGuys; i++)
        	{
        		BadGuys z = new BadGuys();
        		addObject(z, Greenfoot.getRandomNumber(getWidth()), Greenfoot.getRandomNumber(getHeight()));
        			if (z.tooNear())
        			{
        			i--;
            		removeObject(z);
        		}
    		}
	}
	
	
}

  public void die()
        {
            //Det her afsnit viser hvordan bullet rammer zombien så den dør.
            Actor bullet = getOneIntersectingObject (Bullet.class);
            
            if(bullet!=null)
            {
                //Får 2 nye til at spawne når en dør
                ((MyWorld) getWorld()).spawnBadGuys(2);
				getWorld().removeObject(bullet);
                getWorld().removeObject(this);
				
        }
        

        
    }