import java.util.*;
import greenfoot.*;




| A cloud that moves back and forth between two defined points.
|
public class Cloud
extends Actor
{    
private int speed = 4;
    private int leftTurn = 270;
    private int rightTurn = 480;

    


| Move in the direction we are currently moving in. Turn if we reach a turning point.
|
public void act()
    {
        setLocation(getX() + speed, getY());
        
        Actor actor = getOneIntersectingObject(null);
        if (actor != null) {
            actor.setLocation(actor.getX() + speed, actor.getY());
        }
        
        if (atTurningPoint()) {
            speed =  - speed;
        }
    }

    


| Test if we are at one of the turning points.
|
public boolean atTurningPoint()
    {
        return getX() <= leftTurn || getX() >= rightTurn;
    }
}