Arrays - Java Software Solutions: Foundations of Program Design - page 429

LISTING 8.22
//********************************************************************
// DirectionPanel.java Author: Lewis/Loftus
//
// Represents the primary display panel for the Direction program.
//********************************************************************
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class DirectionPanel extends JPanel
{
private final int WIDTH = 300, HEIGHT = 200;
private final int JUMP = 10; // increment for image movement
private final int IMAGE_SIZE = 31;
private ImageIcon up, down, right, left, currentImage;
private int x, y;
//-----------------------------------------------------------------
// Constructor: Sets up this panel and loads the images.
//-----------------------------------------------------------------
public DirectionPanel()
{
addKeyListener ( new DirectionListener());
x = WIDTH / 2;
y = HEIGHT / 2;
up = new ImageIcon ("arrowUp.gif");
down = new ImageIcon ("arrowDown.gif");
left = new ImageIcon ("arrowLeft.gif");
right = new ImageIcon ("arrowRight.gif");
currentImage = right;
setBackground (Color.black);
setPreferredSize ( new Dimension(WIDTH, HEIGHT));
setFocusable( true );
}