Help! Java Animation

[Ultros88]

Hi all,
I'm trying to write a java application to simulate brownian motion but I'm stuck when it comes to implementing the animation. I've seen plenty of examples online for animations in applets but I am unable to translate that over to a stand-alone application. Any help would be greatly appreciated. Points to references, books, online, etc. simple code...

Thanks,
Ultros

[monkeyking]

I don't really understand what level of infomation you want,
but suns webpage is an excellent place for examples and api lookup.

http://java.sun.com/docs/books/tutorial/2d/basic2d/index.html

[Ultros88]

There is nothing about animation in the link you provided. Basically I just want to know how to animate a ball bouncing around in a JFrame. I need to know how to set up an animation thread (maybe a timer?) to take care of redrawing the ball at its computed location in successive intervals. Nothing fancy. I tried simply using repaint but that locked up my system and showed the path of the circle/ball.

[mike_g]

You can do it by setting the paint routine to repaint after a short delay. To you will also want to clear your drawing surface each time you repaint otherwise you get trails. Heres a crude example:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Window extends JFrame
{
private Surface g;

public Window()
{
this.setPreferredSize(new Dimension(256, 256));
this.setDefaultCloseOperation(WindowConstants.EXIT _ON_CLOSE);
this.setVisible(true);
g = new Surface();
this.add(g);
this.pack();

for(int i=0; i<200; i++)
{
g.repaint();
g.move();
try{
Thread.sleep(10);
}catch(InterruptedException ex) {}

}
}
}
and:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


public class Surface extends JPanel
{
private int width, height;
private Point pos;

public Surface()
{
width = 256; height = 256;
pos = new Point(10, 10);
}

public void paint(Graphics g)
{
Graphics2D g2 = (Graphics2D)g;
g2.setBackground(Color.WHITE);
g2.setColor(Color.BLACK);
g2.clearRect(0, 0, width, height);
g2.drawOval(pos.x, pos.y, 5, 5);
}

public void move()
{
pos.x++; pos.y++;
}

}