import java.awt.*;

public class Guitar extends java.applet.Applet
{
    Font f = new Font("TimesRoman", Font.BOLD, 36);
    Font fsmall = new Font("TimesRoman", Font.PLAIN, 14);
    FlowLayout layoutman = new FlowLayout(FlowLayout.RIGHT);
    List chords = new List(5,false);
    Label chordDescrip = new Label("Please select a chord");
    Label chordDescrip2 = new Label("to view from the list box.");
    Button go = new Button("View Chord");
    final int fretx = 25;
    final int frety = 65;    
    int chordcode = 0;

    void DrawFretBoard(Graphics screen)
    {
	int i, j;
	screen.setColor(Color.black);
	screen.fillRect(20, 60, 100, 5);
	// outline of fret board 25, 65 --> 90 wide 200 tall
	// draw indiv frets
	for (j=0; j < 4; j++)
	    for (i=0; i < 6; i++)
		screen.drawRect(fretx, frety+(j*50), (i*18), 50); 
    }

    void DrawBoard(Graphics screen, int [][] board )
    {
	Integer num;
	int i, j;
	for (i=0; i < 4; i++)
	    for (j=0; j < 6; j++)
		if (board[i][j] != 0)
		{
		    screen.setColor(Color.blue);
		    screen.fillOval(fretx-10+(j*18),frety+15+(i*50), 20, 20);
		    screen.setFont(fsmall);
		    screen.setColor(Color.white);
		    num = new Integer(board[i][j]);
		    screen.drawString(num.toString(),
				      fretx-2+(j*18),frety+30+(i*50) );
		}
    }

    void DrawFingerings(Graphics screen)
    {
	// fingerings are given by a 4X6 matrix
	int [][] board = new int [4][6];
	switch( chordcode )
	    {
	    case 0:  // A
		board[0] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[1] = new int [] { 0, 0, 2, 1, 3, 0 };
		board[2] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 1:  // Am
		board[0] = new int [] { 0, 0, 0, 0, 1, 0 };
		board[1] = new int [] { 0, 0, 2, 3, 0, 0 };
		board[2] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 2:  // B
		board[0] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[1] = new int [] { 0, 0, 0, 0, 0, 1 };
		board[2] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[3] = new int [] { 0, 0, 2, 3, 4, 0 };
		break;
	    case 3:  // Bm
		board[0] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[1] = new int [] { 0, 0, 0, 0, 0, 1 };
		board[2] = new int [] { 0, 0, 0, 0, 2, 0 };
		board[3] = new int [] { 0, 0, 3, 4, 0, 0 };
		break;
	    case 4:  // C
		board[0] = new int [] { 0, 0, 0, 0, 1, 0 };
		board[1] = new int [] { 0, 0, 2, 0, 0, 0 };
		board[2] = new int [] { 0, 3, 0, 0, 0, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 5:  // Cm
		board[0] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[1] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[2] = new int [] { 0, 0, 0, 0, 0, 1 };
		board[3] = new int [] { 0, 0, 0, 0, 2, 0 };
		break;
	    case 6:  // D
		board[0] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[1] = new int [] { 0, 0, 0, 1, 0, 2 };
		board[2] = new int [] { 0, 0, 0, 0, 3, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 7:  // Dm
		board[0] = new int [] { 0, 0, 0, 0, 0, 1 };
		board[1] = new int [] { 0, 0, 0, 2, 0, 0 };
		board[2] = new int [] { 0, 0, 0, 0, 4, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 8:  // E
		board[0] = new int [] { 0, 0, 1, 0, 0, 0 };
		board[1] = new int [] { 0, 2, 3, 0, 0, 0 };
		board[2] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 9:  // Em
		board[0] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[1] = new int [] { 0, 2, 3, 0, 0, 0 };
		board[2] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 10:  // F
		board[0] = new int [] { 0, 0, 0, 0, 1, 1 };
		board[1] = new int [] { 0, 0, 0, 2, 0, 0 };
		board[2] = new int [] { 0, 0, 3, 0, 0, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 11:  // Fm
		board[0] = new int [] { 0, 0, 0, 1, 1, 1 };
		board[1] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[2] = new int [] { 0, 0, 3, 0, 0, 0 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 12:  // G
		board[0] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[1] = new int [] { 0, 2, 0, 0, 0, 0 };
		board[2] = new int [] { 3, 0, 0, 0, 0, 4 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    case 13:  // Gm
		board[0] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[1] = new int [] { 0, 0, 0, 0, 0, 0 };
		board[2] = new int [] { 0, 0, 0, 1, 1, 1 };
		board[3] = new int [] { 0, 0, 0, 0, 0, 0 };
		break;
	    }
	DrawBoard(screen, board );
    }

    // takes care of the drawing events in the applet
    //   ie. the fretboard
    public void paint(Graphics screen)
    {
	int chordcode;
	screen.setFont(f);
	screen.setColor(Color.red);
	screen.drawString("Fretboard", 150, 240);

	DrawFretBoard(screen);	    
	DrawFingerings(screen);
    }

    // event handler for my applet -- only 1 event is caught
    public boolean action(Event evt, Object arg)
    {
	if (evt.target instanceof Button)	    
	{
	    // if button is pressed then display new fingering
	    chordcode = chords.getSelectedIndex();
	    repaint();
	    return true;
	}
	else if (evt.target instanceof List)
	{
	    // a chord is selected from list
	    return true;
	}
	else return false;
    }

    // initializer for my applet, 
    // it sets up the layout and adds components
    public void init()
    {
	setLayout(layoutman);
	add(chordDescrip);
	add(chordDescrip2);
	add(go);
	chords.addItem("A");
	chords.addItem("Am");
	chords.addItem("B");
	chords.addItem("Bm");
	chords.addItem("C");
	chords.addItem("Cm");
	chords.addItem("D");
	chords.addItem("Dm");
	chords.addItem("E");
	chords.addItem("Em");
	chords.addItem("F");
	chords.addItem("Fm");
	chords.addItem("G");
	chords.addItem("Gm");
	add(chords);
	//chords.select(0);
    }

}