Shuriken.java

import greenfoot.*; // import every greefoot function, object and more

public class Shuriken extends Actor implements Enemy
{
    private int speed;
    private GreenfootImage image;
    private int rotationAngle = 0;
    
    public Shuriken(int _speed) {
        this.speed = _speed;
        this.image = new GreenfootImage("./images/shuriken.png");
        this.setImage(image);
    }
    
    public void act() {
        this.move(this.speed);
        this.removeOnEdge();
        this.rotate();
    }
    
    /**
     * Remove object at the edge of the world
     */
    private void removeOnEdge() {
        if (this.isAtEdge()) {
            MapManager.currentMap.removeObject(this);
        }
    }
    
    /**
     * Rotate the image to create a nice effect
     */
    private void rotate() {
        rotationAngle = (rotationAngle + 10) % 360;
        GreenfootImage rotated = new GreenfootImage(this.image);
        rotated.rotate(rotationAngle);
        setImage(rotated);
    }
    
    @Override
    public int getDamage() {
        return 4;
    }
}