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

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

    private GreenfootSound song = new GreenfootSound("song1.mp3");
    private Play play = new Play();
    private VolumeUp volumeup = new VolumeUp();
    private VolumeDown volumedown = new VolumeDown();
    private int volumeLevel = 50;
    private GreenfootImage volume = new GreenfootImage (80, 20);
    private VolumeBar volumeBar = new VolumeBar();

    /**
     * Constructor for objects of class MyWorld.
     * 
     */
    public MyWorld()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(400, 300, 1); 
        prepare();

    }
    
    public GreenfootImage getVolume(){
        return volume;
    }
    
    public void setVolume(GreenfootImage volume){
        this.volume=volume;
    }
    
    public VolumeBar getVolumeBar(){
        return volumeBar;
    }
    
    public int getVolumeLevel(){
        return volumeLevel;
    }
    
    public void setVolumeLevel(int volumeLevel){
        this.volumeLevel = volumeLevel;
    }
    
    public Play getPlay()
    {
        return play;
    }

    public VolumeUp getVolumeUp(){
        return volumeup;
    }

    public VolumeDown getVolumeDown(){
        return volumedown;
    }

    public GreenfootSound getSong()
    {
        return song;
    }

    public void setSong(String filename){
        song.stop();
        song.play();
    }
    
    /**
     * Prepare the world for the start of the program.
     * That is: create the initial objects and add them to the world.
     */
    private void prepare()
    {
        addObject(play,53,60);
        addObject(volumeup,305,73);
        addObject(volumedown,305,146);
        addObject(volumeBar,126,237);
    }
}

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

/**
 * Write a description of class VolumeBar here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class VolumeBar extends Volume
{
    private GreenfootImage bar = new GreenfootImage(100,10);
    private int audioLevel = 20;
    
    public VolumeBar(){
        bar.drawRect(0,0,99,9);
        bar.setColor( Color.YELLOW);
        bar.fillRect(1,1,audioLevel+2,9);
        setImage(bar);
    }
    
    public void setAudioLevel(int audioLevel){
        this.audioLevel = audioLevel;
    }
    
    public void changeVolume(int points){
        MyWorld world = new MyWorld();
        audioLevel = world.getVolumeLevel();
        GreenfootImage bar = getImage();
        bar.clear();
        bar.setColor(Color.BLACK);
        bar.drawRect(0,0,99,9);
        bar.setColor(Color.YELLOW);
        audioLevel += points;
        bar.fillRect(1,1,audioLevel+5,9);
    }
    
    /**
     * Act - do whatever the VolumeBar wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        if (Greenfoot.mouseClicked(VolumeUp.class)){
            changeVolume(audioLevel);
        }
    }
    
}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.awt.Color;
/**
 * Write a description of class VolumeUp here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class VolumeUp extends Volume
{
    private int volume = 0; 
    
    /**
     * Act - do whatever the VolumeUp wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        MyWorld myworld = new MyWorld();
        volume = myworld.getVolumeLevel();
        if (Greenfoot.mouseClicked(this)){
            MyWorld myWorld = (MyWorld)this.getWorld();
			GreenfootSound mySong = myWorld.getSong();
			myworld.setVolumeLevel(1000);
			mySong.setVolume(volume += 10);		
			VolumeBar volume = new VolumeBar();
			volume.changeVolume(500);
        }
    }    
}