For this lab, you'll build on the Dots.java and DotsPanel.java programs.

Instead of drawing dots you will draw squares so add that change.

Add animation using a Timer so that the squares all move when drawn. Make each square move at random speed (in x and y directions), and have the squares "bounce" appropriately off all four sides of the screen.

HINTS:

Create 2 arrays of size 1000 to hold random values between 1 and 10 for the X movements and Y movements. This will allow your rectangles to have independent movement speeds.

You will need to create a ActionListener class similar to what is used in ReboundPanel class.

Inside the Actionistener class you create you will want to reference the X and Y array indexes rather than the static moveX and moveY used in the ReboundPanel.

Dots.java Code:

import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Point; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.security.SecureRandom; import java.util.ArrayList; import javax.swing.JFrame; import javax.swing.JPanel;

public class Dots extends JPanel { private final int SIZE = 6; private ArrayList pointList; public Dots() { pointList = new ArrayList(); addMouseMotionListener(new DotsListener()); setBackground(Color.black); setPreferredSize(new Dimension(300, 200)); } private void setColor(Color color) { } public void paint(Graphics page) { super.paintComponent(page); SecureRandom randomNum = new SecureRandom(); Color color = new Color(randomNum.nextInt(256), randomNum.nextInt(256), randomNum.nextInt(256)); page.setColor(color); for (Point spot : pointList) page.fillOval(spot.x - SIZE, spot.y - SIZE, SIZE * 2, SIZE * 2); page.drawString("Count: " + pointList.size(), 5, 15); } private class DotsListener implements MouseMotionListener { public void mousePressed(MouseEvent event) { pointList.add(event.getPoint()); repaint(); } public void mouseMoved(MouseEvent event) { } public void mouseClicked(MouseEvent event) { } public void mouseReleased(MouseEvent event) { } public void mouseEntered(MouseEvent event) { } public void mouseExited(MouseEvent event) { } public void mouseDragged(MouseEvent event) { pointList.add(event.getPoint()); repaint(); } } public static void main(String args[]) { JFrame frame = new JFrame(); frame.add(new Dots()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setBounds(20,20, 500,500); frame.setVisible(true); } }