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

/**
 * Write a description of class Black_Key here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */

public class Black_Key extends Actor
{
    /**
     * Create a new key.
     */
    public String black_key;
    private String black_sound;
    
    public Black_Key(String keyName, String soundFile)  { //won't work without "void" return type declaration
            black_key = keyName;
            black_sound = soundFile;
    }
    String[] blackKeys = {"W", "E", "T", "Y", "U", "O", "P", "]"};
    String[] blackNotes = {"3c#", "3d#", "3f#", "3g#", "3a#", "4c#", "4d#", "4f#"};
    /**
     * Do the action for this key.
     */
    public void act()  {
        animateBlackKey(); // throws errror because of line in method
        
    }
    public boolean isDown2;
    private void playSound() {
        Greenfoot.playSound(black_sound);
    }
    public void animateBlackKey() {
        if(!isDown2 && Greenfoot.isKeyDown(black_key)){ //throws unknown error that key is blank
            setImage("black-key-down.png");
            isDown2 = true;
            playSound();
        }
        if(isDown2 && !Greenfoot.isKeyDown(black_key)){
            setImage("black-key.png");
            isDown2 = false;
        }
    }
}

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

/**
 * A piano that can be played with the computer keyboard.
 * 
 * @author: M. Kolling
 * @version: 0.1
 */
public class Piano extends World
{
    /**
     * Make the piano.
     */
    public Piano() 
    {
        super(800, 340, 1);
        displayWhiteKeys();
        displayBlackKeys();
    }
    //White keys
    public String[] whiteKeys = {"a", "s", "d", "f", "g", "h", "j", "k", "l", ";", "'", "/"};
    public String[] whiteNotes = {"3a", "3b", "3c", "3d", "3e", "3f", "3g", "4c", "4d", "4e", "4f", "4g"};
    //Black keys
    String[] blackKeys = {"W", "E", "", "T", "Y", "U", "", "O", "P", "", "]"};
    String[] blackNotes = {"3c#", "3d#", "", "3f#", "3g#", "3a#", "", "4c#", "4d#", "", "4f#"};
    public void displayWhiteKeys() {
        int i = 0;
        while (i < 12) {
            Key key = new Key(whiteKeys[i], whiteNotes[i] + ".wav");
            addObject (key, 54 + (i*key.getImage().getWidth()), 140);
            i++;
        }
    }
    public void displayBlackKeys() {
        int x = 0;     
        int l;
        while(x < 8) {
            Black_Key bkey = new Black_Key(blackKeys[x], blackNotes[x] + ".wav");
            addObject (bkey, 150 + (x*63), 85); // replace l with number for spacing
            x++;
        }
    }
}

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

public class Key extends Actor
{
    /**
     * Create a new key.
     */
    private String key;
    private String sound;
    
    public Key(String keyName, String soundFile)  {
            key = keyName;
            sound = soundFile;
    }
    String[] whiteKeys = {"A", "S", "D", "F", "G", "H", "J", "K", "L", ";", "'", "/"};
    String[] whiteNotes = {"3a", "3b", "3c", "3d", "3e", "3f", "3g", "4c", "4d", "4e", "4f", "4g"};
    /**
     * Do the action for this key.
     */
    public void act()  {
        animateKey();
        
    }

    public boolean isDown;
    
    public void playSound() {
        Greenfoot.playSound(sound);
    }
    public void animateKey() {
        if(!isDown && Greenfoot.isKeyDown(key)){
            setImage("white-key-down.png");
            isDown = true;
            playSound();
        }
        if(isDown && !Greenfoot.isKeyDown(key)){
            setImage("white-key.png");
            isDown = false;
        }
    }
}