SparksEffect.java

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class SparksActor here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class SparksEffect extends Actor
{

    public static GreenfootImage images[] = new GreenfootImage[16];
    int counter = 0;
    public int speed = 0;

    long startTime = 0;

    public SparksEffect()
    {
        if(null == images[0])
        {
            for(int i = 0 ; i < 16 ; i++)
            {
                int j = i + 1;
                images [i] = new GreenfootImage("fire-" + j + ".png");
            }
        }
        setImage(images[0]);
    }

    /**
     * Act - do whatever the SparksActor wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        // Add your action code here.
        int index = counter;

        long endTime = System.currentTimeMillis();

        if((endTime - startTime) < 50)
        {
            return;
        }

        startTime = System.currentTimeMillis();

        if(index > 15)
        {
            index = 15;
        }

        setImage(images[index]);

        setRotation(getRotation() + Greenfoot.getRandomNumber(11)-5);

        move(speed);

        counter++;

        if(counter > 16)
        {
            getWorld().removeObject(this);
        }
    }    

}