import greenfoot.*; // (World, Actor, GreenfootImage, and Greenfoot)
import java.util.List;
/**
* A rock in space
* @author matthew andries
* @author Poul Henriksen
*/
public class Asteroid extends SmoothMover
{
private Counter counter;
/** Size of this asteroid */
private int size;
/** When the stability reaches 0 the asteroid will explode */
private int stability;
public Asteroid(Counter scoreCounter)
{
counter=scoreCounter;
}
public Asteroid()
{
this(50);
}
public Asteroid(int size)
{
super(new Vector(Greenfoot.getRandomNumber(360), 2));
setSize(size);
}
public Asteroid(int size, Vector speed)
{
super(speed);
setSize(size);
}
public void act()
{
move();
}
/**
* Set the size of this asteroid. Note that stability is directly
* related to size. Smaller asteroids are less stable.
*/
public void setSize(int size)
{
stability = size;
this.size = size;
GreenfootImage image = getImage();
image.scale(size, size);
}
/**
* Return the current stability of this asteroid. (If it goes down to
* zero, it breaks up.)
*/
public int getStability()
{
return stability;
}
/**
* Hit this asteroid dealing the given amount of damage.
*/
public void hit(int damage) {
stability = stability - damage;
if(stability <= 0)
breakUp ();
}
/**
* Break up this asteroid. If we are still big enough, this will create two
* smaller asteroids. If we are small already, just disappear.
*/
private void breakUp()
{
Space space = (Space) getWorld();
Greenfoot.playSound("Explosion.wav");
((Space)getWorld()).countScore();
if(size <= 16)
{
getWorld().removeObject(this);
space.counterScore(25); //adds 25 points for removing astreriod.
}
else
{
int r = getMovement().getDirection() + Greenfoot.getRandomNumber(45);
double l = getMovement().getLength();
Vector speed1 = new Vector(r + 60, l * 1.2);
Vector speed2 = new Vector(r - 60, l * 1.2);
Asteroid a1 = new Asteroid(size/2, speed1);
Asteroid a2 = new Asteroid(size/2, speed2);
getWorld().addObject(a1, getX(), getY());
getWorld().addObject(a2, getX(), getY());
a1.move();
a2.move();
getWorld().removeObject(this);
space.countScore(10); //adds 10 points for splitting an asteroid.
}
}
