Java Screensaver Program

 Java Screensaver Program

Java Code:

import java.awt.*;

import java.awt.geom.*;

import javax.swing.*;

import java.awt.event.*;

public class ScreenSaver extends JPanel implements ActionListener {

 private JFrame frame = new JFrame("FullSize");

 private final int DELAY = 9999999;

 private Timer timer;

 private Rectangle rectangle;

 boolean full;

 private Color color=Color.BLACK;

 int i=0;

 // constructor sets window's title bar string and dimensions

 public ScreenSaver()

 {

        frame.setUndecorated(true);

     // Add a Key Listener to the frame

    frame.addKeyListener(new KeyHandler());

     // Add this panel object to the frame

     frame.add(this);

     // Get the dimensions of the screen

     rectangle = GraphicsEnvironment.getLocalGraphicsEnvironment()

     .getDefaultScreenDevice().getDefaultConfiguration().getBounds();

     // Set the size of the frame to the size of the screen

     frame.setSize(rectangle.width, rectangle.height);

     frame.setVisible(true);

     frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

     setBackground(color);

  

     // Remember that we are currently at full size

     full = true;

 timer = new Timer( 1000, this ); // create a new timer

 timer.start();

 }

class KeyHandler extends KeyAdapter

 {

       public void keyPressed(KeyEvent e)

       {

             // Terminate the program.

          int keyCode= e.getKeyCode();

         if(keyCode== KeyEvent.VK_E){

             System.exit(0);

             }

         if(keyCode==KeyEvent.VK_S && i%2==0){

                i++;

                frame.setSize(rectangle.width/2,rectangle.height/2);

                repaint();

         }

         else if(keyCode==KeyEvent.VK_S && i%2==1){

                i++;

              frame.setSize(rectangle.width,rectangle.height);

                repaint();

         }

         if(keyCode==KeyEvent.VK_C){

                setBackground( new Color( ( float ) Math.random(),

                            ( float ) Math.random(), ( float ) Math.random() ));

                repaint();

         }

         

       }

       }

 public void paintComponent ( Graphics g )

 {

 super.paintComponent ( g );

 int shape;

 for ( int i = 0; i < 25; i++ ) {

 shape = ( int ) ( Math.random() * 4 ); // pick a random shape

 switch( shape ) {

 case 0:

 makeLine( g );

 break;

 case 1:

 makeRect( g );

 break;

 case 2:

 makeOval( g );

 break;

 case 3:

 makeRoundRect( g );

 break;

 }

 for ( int q = 1; q < DELAY; q++ ) ;

 }

 }

 public static void main( String args[] )

 {

 ScreenSaver run = new ScreenSaver();

 }

 public void actionPerformed( ActionEvent actionEvent )

 {

 repaint();

 }

private void makeLine( Graphics g ) {

Graphics2D g2d = ( Graphics2D ) g;

 double x = Math.random() * 1600;

 double y = Math.random() * 300;

 double x1 = Math.random()* 800;

double y1 = Math.random() * 1500;

 g2d.setPaint( new GradientPaint( (int)x, (int)y,

new Color( ( float ) Math.random(), ( float ) Math.random(),

 ( float ) Math.random() ), (int)x1, (int)y1,

 new Color( ( float ) Math.random(), ( float ) Math.random(),

 ( float ) Math.random() ), true ) );

 g2d.draw( new Line2D.Double( x, y, x1, y1 ) );

 }

 private void makeRect( Graphics g ) {

 Graphics2D g2d = ( Graphics2D ) g;

 double x = Math.random() * 1500;

 double y = Math.random() * 1600;

 double width = Math.random() * 300;

 double height = Math.random() * 300;

 g2d.setPaint( new GradientPaint( (int)x, (int)y,

 new Color( ( float ) Math.random(), ( float ) Math.random(),

 ( float ) Math.random() ), (int)(x + width), (int)(y + height),

 new Color( ( float ) Math.random(), ( float ) Math.random(),

 ( float ) Math.random() ), true ) );

 g2d.draw( new Rectangle2D.Double( x, y, width, height ) );

 }

 private void makeOval( Graphics g ) {

 Graphics2D g2d = ( Graphics2D ) g;

 double x = Math.random() * 800;

 double y = Math.random() * 1400;

 double width = Math.random() * 300;

 double height = Math.random() * 300;

 g2d.setPaint( new GradientPaint( (int)x, (int)y,

 new Color( ( float ) Math.random(), ( float ) Math.random(),

 ( float ) Math.random() ), (int)(x + width), (int)(y + height),

 new Color( ( float ) Math.random(), ( float ) Math.random(),

 ( float ) Math.random() ), true ) );

 g2d.draw( new Ellipse2D.Double( x, y, width, height ) );

}

 private void makeRoundRect( Graphics g ) {

Graphics2D g2d = ( Graphics2D ) g;

 double x = Math.random() * 1400;

 double y = Math.random() * 800;

 double width = Math.random() * 200;

 double height = Math.random() * 200;

 double arcWidth = Math.random() * width;

 double arcHeight = Math.random() * height;

 g2d.setPaint( new GradientPaint( (int)x, (int)y,

 new Color( ( float ) Math.random(), ( float ) Math.random(),

 ( float ) Math.random() ), (int)(x + width), (int)(y + height),

 new Color( ( float ) Math.random(), ( float ) Math.random(),

 ( float ) Math.random() ), true ) );

 g2d.draw( new RoundRectangle2D.Double( x, y, width, height,

 arcWidth, arcHeight ) );

 }

 }

Screenshots: