import greenfoot.*;

/**
 * This class defines a crab. Crabs live on the beach.
 */
public class Crab extends Actor
{
     public void act()
    {
       move(4);
       turnAtEdge();
       control();
     }
    
    public void turnAtEdge() {
            if(isAtEdge()) {
                turn(20);
            }
    }
    
    public void control() {
        if(Greenfoot.isKeyDown("left")) {
            turn(-9);
        }
        if(Greenfoot.isKeyDown("right")) {
           turn(9);
        }
       }
     
}