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

/**
 * Write a description of class Background here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Background extends World
{
    Counter counter = new Counter();
    private int wave;
    /**
     * Constructor for objects of class Background.
     * 
     */
    public Background()
    {   
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(700, 600, 1); 
        prepare();
    }
    
    public Counter getCounter()
    {
        return counter;
    }
    
    
    private void prepare()
    {        
        addObject(counter, 100, 40);
        Prince prince = new Prince();
        addObject(prince, 339,554);
        First first = new First();
        addObject(first, 41, 65);
        First first1 = new First();
        addObject(first1, 41, 256);
        First first2 = new First();
        addObject(first2, 41, 483);
        First first3 = new First();
        addObject(first3, 656, 162);
        First first4 = new First();
        addObject(first4, 656 ,386);
    }
    
    private void spawn()
    {
        Second[] seconds = new Second[5];
        for(int i=0; i<seconds.length;i++)
        {
            seconds[i] = new Second();
            int SecondX = Greenfoot.getRandomNumber(getWidth());
            int SecondY = Greenfoot.getRandomNumber(getHeight());
            addObject(seconds[i], SecondX, SecondY);
        }
    }
    
}

public void act()
{
    if (wave == 0 && counter.getValue() == 5)
    {
        wave = 1;
        spawn();
    }
}