Java SE (Java Platform, Standard Edition)

Hey everyone how are ya:

Trying to change my bouncing ball program here to change color (random) when it hits the borders and also make sure it is moving in random directions. I think right now I only have it moving left to right-as well as get the ball to start in the center instead of upper left corner anyone help?? Here is the code its long but well documented sorry :

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class BallInBox extends JPanel
{
//============================================== fields
//... Instance variables representing the ball.
private Ball m_ball = new Ball(0, 0, 2, 3);

//... Instance variables for the animiation
private int m_interval = 35; // Milliseconds between updates.
Timer m_timer; // Timer fires to anmimate one step.

//========================================================== constructor
/** Set panel size and creates timer. */
public BallInBox()
{
setPreferredSize(new Dimension(200, 80));
setBorder(BorderFactory.createLineBorder(Color.BLACK));
m_timer = new Timer(m_interval, new TimerAction());
}

//========================================================= setAnimation
/** Turn animation on or off.
*@param turnOnOff Specifies state of animation.
*/
public void setAnimation(boolean turnOnOff)
{
if (turnOnOff)
{
m_timer.start(); // start animation by starting the timer.
}
else
{
m_timer.stop(); // stop timer
}
}

//======================================================= paintComponent
public void paintComponent(Graphics g)
{
super.paintComponent(g); // Paint background, border

m_ball.draw(g); // Draw the ball.
}

//////////////////////////////////// inner listener class ActionListener
class TimerAction implements ActionListener
{
//================================================== actionPerformed
/** ActionListener of the timer. Each time this is called,
* the ball's position is updated, creating the appearance of
* movement.
*@param e This ActionEvent parameter is unused.
*/
public void actionPerformed(ActionEvent e) {
m_ball.setBounds(getWidth(), getHeight());
m_ball.move(); // Move the ball.
repaint(); // Repaint indirectly calls paintComponent.
}
}
}//endclass


import java.awt.*;

public class Ball
{
//... Constants
final static int DIAMETER = 21;

//... Instance variables
private int m_x; // x and y coordinates upper left
private int m_y;

private int m_velocityX; // Pixels to move each time move() is called.
private int m_velocityY;

private int m_rightBound; // Maximum permissible x, y values.
private int m_bottomBound;

//======================================================== constructor
public Ball(int x, int y, int velocityX, int velocityY) {
m_x = x;
m_y = y;
m_velocityX = velocityX;
m_velocityY = velocityY;
}

//======================================================== setBounds
public void setBounds(int width, int height)
{
m_rightBound = width - DIAMETER;
m_bottomBound = height - DIAMETER;
}

//============================================================== move
public void move()
{
//... Move the ball at the give velocity.
m_x += m_velocityX;
m_y += m_velocityY;

//... Bounce the ball off the walls if necessary.
if (m_x < 0)
{ // If at or beyond left side
m_x = 0; // Place against edge and
m_velocityX = -m_velocityX; // reverse direction.

}
else if (m_x > m_rightBound)
{ // If at or beyond right side
m_x = m_rightBound; // Place against right edge.
m_velocityX = -m_velocityX; // Reverse direction.
}

if (m_y < 0)
{ // if we're at top
m_y = 0;
m_velocityY = -m_velocityY;

}
else if (m_y > m_bottomBound)
{ // if we're at bottom
m_y = m_bottomBound;
m_velocityY = -m_velocityY;
}
}

//============================================================== draw
public void draw(Graphics g)
{
g.fillOval(m_x, m_y, DIAMETER, DIAMETER);
}

//============================================= getDiameter, getX, getY
public int getDiameter() { return DIAMETER;}
public int getX() { return m_x;}
public int getY() { return m_y;}

//======================================================== setPosition
public void setPosition(int x, int y)
{
m_x = x;
m_y = y;
}
}


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/////////////////////////////////////////////////////////////////// BBPanel
class BBPanel extends JPanel {
BallInBox m_bb; // The bouncing ball panel

//========================================================== constructor
/** Creates a panel with the controls and bouncing ball display. */
BBPanel() {
//... Create components
m_bb = new BallInBox();
JButton startButton = new JButton("Start");
JButton stopButton = new JButton("Stop");

//... Add Listeners
startButton.addActionListener(new StartAction());
stopButton.addActionListener(new StopAction());

//... Layout inner panel with two buttons horizontally
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new FlowLayout());
buttonPanel.add(startButton);
buttonPanel.add(stopButton);

//... Layout outer panel with button panel above bouncing ball
this.setLayout(new BorderLayout());
this.add(buttonPanel, BorderLayout.NORTH);
this.add(m_bb , BorderLayout.CENTER);
}//end constructor


////////////////////////////////////// inner listener class StartAction
class StartAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
m_bb.setAnimation(true);
}
}


//////////////////////////////////////// inner listener class StopAction
class StopAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
m_bb.setAnimation(false);
}
}
}//endclass BBPanel

import javax.swing.*;

/////////////////////////////////////////////////////////////// BBDemo
public class BBDemo extends JApplet {

//============================================== applet constructor
public BBDemo() {
add(new BBPanel());
}

//============================================================ main
public static void main(String[] args) {
JFrame win = new JFrame("Bouncing Ball Demo");
win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

win.setContentPane(new BBPanel());

win.pack();
win.setVisible(true);
System.out.println(win.getSize());
}
}//endclass BBDemo


The BBDemo is the class that contains main

Thanks in advance for all your help guys
rich_crush