import greenfoot.*;

/**
 * This class defines a crab. Crabs live on the beach.
 */
public class Crab extends Actor
{
    
    private int flag=0;
    public void act()
    {
       move(3);
       turnAtEdge();
       control();
       animate();
    }
    public void animate(){
       if(flag == 1){
           setImage("crab2.png");
           flag=0;
        }else{
           setImage("crab.png");
           flag=1;
        }
    }
   public void turnAtEdge() {
     if(isAtEdge()){
           turn(50);
       }
    }
    public void control() {
        if(Greenfoot.isKeyDown("left")){
           turn(-15);
        }
        if(Greenfoot.isKeyDown("right")){
           turn(15);
        }
        if(Greenfoot.isKeyDown("up")){
           turn(90);
        }
        if(Greenfoot.isKeyDown("down")){
          turn(-90);
        }
    }
}