Вы можете начать изучать темы в Java.Здесь я только что изменил (добавив Animator) к примеру sun tutorials
Хитрость в том, что теперь поток (Animator
ниже) обновляет переменную живописца каждые 0,5 секундыи вызывает перерисовку для панели.
Вот полный пример:
package com.swing.examples;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.swing.examples.BullsEyePanel.Animator;
/*
***************************************************************
* Silly Sample program which demonstrates the basic paint
* mechanism for Swing components.
***************************************************************
*/
public class SwingPaintDemo {
public static void main(String[] args) {
JFrame f = new JFrame("Aim For the Center");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
BullsEyePanel panel = new BullsEyePanel();
panel.add(new JLabel("BullsEye!", SwingConstants.CENTER), BorderLayout.CENTER);
f.getContentPane().add(panel, BorderLayout.CENTER);
f.pack();
f.show();
Animator animator = panel.new Animator(panel);
animator.start();
}
}
/**
* A Swing container that renders a bullseye background
* where the area around the bullseye is transparent.
*/
class BullsEyePanel extends JPanel {
private int i = 0;
public BullsEyePanel() {
super();
setOpaque(false); // we don't paint all our bits
setLayout(new BorderLayout());
setBorder(BorderFactory.createLineBorder(Color.black));
}
public Dimension getPreferredSize() {
// Figure out what the layout manager needs and
// then add 100 to the largest of the dimensions
// in order to enforce a 'round' bullseye
Dimension layoutSize = super.getPreferredSize();
int max = Math.max(layoutSize.width,layoutSize.height);
return new Dimension(max+100,max+100);
}
protected void paintComponent(Graphics g) {
Dimension size = getSize();
int x = 0;
int y = 0;
while(x < size.width && y < size.height) {
g.setColor(i%2==0? Color.red : Color.white);
g.fillOval(x,y,size.width-(2*x),size.height-(2*y));
x+=10; y+=10; i++;
}
}
class Animator extends Thread{
private BullsEyePanel painter;
private int sleepTime = 500; //half a second
public Animator(BullsEyePanel painter){
this.painter = painter;
}
public void run(){
while(true){
painter.i++;
painter.repaint();
try{
Thread.sleep(sleepTime);
}
catch(InterruptedException e){
e.printStackTrace();
}
}
}
}
}