import greenfoot.*;

/**
 * Write a description of class Plane here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Plane extends Actor
{
    /**
     * Act - do whatever the Plane wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     * if (isAtEdge())
    {
        Greenfoot.setWorld(new SkyEnemy()); or Greenfoot.setWorld(new SkyEnemyTwo()); or Greenfoot.setWorld(new SkyEnemyThree());
    }
     */
    public void act() 
    {
    {
            setRotation(0);
            move(2);
    }    
        if (Greenfoot.isKeyDown("Up"))
    {
            setRotation(-20);
            move(2);
    }
    if (Greenfoot.isKeyDown("Down"))
    {
        setRotation(70);
            move(2);
        }
    if (isAtEdge())
    {
        if (Greenfoot.getRandomNumber(4)==1)
        {
            Greenfoot.setWorld(new SkyEnemy());
    }
       if (Greenfoot.getRandomNumber(4)==2)
       {
           Greenfoot.setWorld(new SkyEnemyTwo());
        }
        if (Greenfoot.getRandomNumber(4)==3)
        {
            Greenfoot.setWorld(new SkyEnemyThree());
        }
        public Plane()
{
    GreenfootImage image = getImage();
    image.scale(image.getWidth() - 80, image.getHeight() - 80);
    setImage(image);
}
    }
    }
}