Clock.java

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

/**
 * Write a description of class Clock here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Clock
{
    private long start;
    float totalSeconds;
    Character minutes1; 
    Character minutes2; 
    Character seconds1;
    Character seconds2;

    public Clock(Scenario scenario){
        start = System.currentTimeMillis();
        totalSeconds = 0;
        
        minutes1  = new Character(); 
        scenario.addObject(minutes1, 21, 225);
        minutes2  = new Character(); 
        scenario.addObject(minutes2, 48, 225);
        seconds1  = new Character(); 
        scenario.addObject(seconds1, 95, 225);
        seconds2  = new Character(); 
        scenario.addObject(seconds2, 122, 225);
    }

    public void time() 
    {
        long end = System.currentTimeMillis();

        if(end - totalSeconds >= 1.0){
            totalSeconds = ((end - start) / 1000F);
    
            int seconds = (int)totalSeconds;
            int minutes = seconds / 60;
            seconds -= minutes * 60;
            
            minutes2.changeImage(String.valueOf(minutes % 10));
            minutes /= 10;
            minutes1.changeImage(String.valueOf(minutes));
            
            seconds2.changeImage(String.valueOf(seconds % 10));
            seconds /= 10;
            seconds1.changeImage(String.valueOf(seconds));
        }
    }    

    public float getTotalSeconds(){
        return totalSeconds;
    }
}