package cqu;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import javax.swing.JPanel;

public class PaintPanel extends JPanel {

private static final long serialVersionUID = 8604233370913902709L;

private int x=0;

private int y=0;

private int xDirection=1;

private int yDirection=0;

/**

* Create the panel.

*/

public PaintPanel() {

Thread t=new Thread()

{

public void run()

{

while(true)

{

x+=xDirection;

y+=yDirection;

//xDirection=0;

//yDirection=0;

repaint();

try {

Thread.sleep(40);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

};

t.start();

this.addKeyListener(new KeyListener(){

@Override

public void keyTyped(KeyEvent e) {

}

@Override

public void keyPressed(KeyEvent e) {

switch(e.getKeyCode())

{

case KeyEvent.VK_UP:

yDirection=-1;

break;

case KeyEvent.VK_DOWN:

yDirection=1;

break;

case KeyEvent.VK_LEFT:

xDirection=-1;

break;

case KeyEvent.VK_RIGHT:

xDirection=1;

break;

}

//repaint();

}

@Override

public void keyReleased(KeyEvent e) {

}

});

}

@Override

public void paint(Graphics g) {

super.paint(g);

g.setColor(Color.RED);

g.fillRect(x, y, 200, 200);

}

}