Hello Dan post,
I am currently on part 5 of greenfoot chapter 5 piano part 5. I have run into a problem and i cannot seem to figure out why it is wrong.
Below is my code for the piano class, when i compile it highlights "whiteKeyWidth"
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
{
private String whiteKeys =
{ "q", "w", "e", "r", "t", "y", "u", "i", "o", "p", "" };
private String whiteNotes =
{ "3c", "3d", "3e", "3f", "3g", "3a", "3b", "4c", "4d", "4e", "4f", "4g" };
private String blackKeys =
{ "2", "3", "", "5", "6", "7", "", "9", "0", "", "=", "c"};
private String blackNotes =
{ "3c#", "3d#", "3e#", "3f#", "3g#", "3a#", "3a#", "4c#", "4d#", "4d#", "4f#", "4f#" };
/**
* Piano's Constructor
*/
public Piano()
{
super(800, 340, 1);
addKeys();
addblackKeys();
makeKeys();
}
/**
* Create the piano keys and place them in the world.
*/
private void addKeys()
{
int i = 0;
while (i < whiteKeys.length)
{
Key mykey = new Key(whiteKeys, whiteNotes+".wav", "white-key.png", "white-key-down.png");
// get the image from the key and ask it what its width is
int keyWidth = mykey.getImage().getWidth();
whitekeyWidth = keyWidth;
// get the image from the key and ask it what its height is
int keyHeight = myKey.getImage().getHeight();
//we're in Piano, which is a World, so ask it what its width is
int worldWidth = getWidth();
int offset = ((worldWidth - (12* keyWidth))/2)+(keyWidth/2);
addObject (myKey, i*keyWidth + offset, keyHeight/2);
i = i = 1;
}
}
private void addblackKeys()
{
int i = 0;
while (i < blackKeys.length)
{
if ( ! blackKeys.equals("") )
{
Key mykey = new Key(blackKeys, blackNotes+".wav", "black-key.png", "black-key-down.png");
int keyWidth = myKey.getImage().getWidth();
blackKeyWidth = keyWidth;
int keyHeight = myKey.getImage().getHeight();
int worldWidth = getWidth();
int offset = ((worldWidth - (12* keyWidth))/2)+(keyWidth/2);
addObject (myKey, i*keyWidth + offset, keyHeight/2);
i = i = 1;
}
}
}
public void makeKeys()
{
GreenfootImage bg = getBackground();
bg.setColor(Color.PINK);
bg.drawString("Click Run, then use your keyboard to play");
}
}
