This post continues a serie of posts I’m writing about 2D game development in Java.
A simple example of an JPanel that implements KeyListener (and a little trick) to handle KeyEvents to move a white square.
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class KeyPanel extends JPanel implements KeyListener{
private int x=50,y=50;
public KeyPanel() {
JTextField textfield = new JTextField();
textfield.addKeyListener(this);
add(textfield);
textfield.setPreferredSize(new Dimension(0,0));
}
public void keyTyped(KeyEvent e) {}
public void keyReleased(KeyEvent e) {}
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_LEFT)
x-=5;
if (e.getKeyCode() == KeyEvent.VK_RIGHT)
x+=5;
if (e.getKeyCode() == KeyEvent.VK_DOWN)
y+=5;
if (e.getKeyCode() == KeyEvent.VK_UP)
y-=5;
this.repaint();
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.black);
g.fillRect(0, 0, 500, 500);
g.setColor(Color.white);
g.fillRect(x, y, 50, 50);
}
}
Download the complete NetBeans source project files: KeyTest.tar.bz2.
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