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

/**
 * Write a description of class enemy here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Enemy extends Actor
{
    /**
     * Act - do whatever the enemy wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act ()
    {
        if (atWorldEdge())
        {
            turn(17);
        }
        move(2);
        if (Greenfoot.getRandomNumber(100) < 10)
        {
            turn(5);
        }
        if (Greenfoot.getRandomNumber(100) < 11)
        {
            turn(-5);
        }
        if (Greenfoot.getRandomNumber(700) <1)
        {
            turn(50);
        }
    }
        public boolean atWorldEdge()
    {
        if(getX() < 10 || getX() > getWorld().getWidth() - 10)
            return true;
        if(getY() < 10 || getY() > getWorld().getHeight() - 10)
            return true;
        else
            return false;
    }
}