AnimatedScreenCapture.java

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

public class AnimatedScreenCapture extends JFrame {
  JLabel label;
  Robot robot;

  Rectangle screenRect;

  int scaleX;
  int scaleY;

  public AnimatedScreenCapture() {
    super("Animated Screen Capture");
    setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

    screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize().width, 
                               Toolkit.getDefaultToolkit().getScreenSize().height);

    scaleX = Toolkit.getDefaultToolkit().getScreenSize().width;
    scaleY = Toolkit.getDefaultToolkit().getScreenSize().height;

    label = new JLabel();
    label.setPreferredSize(new Dimension(scaleX, scaleY));
    getContentPane().add( label );

    try {
      robot = new java.awt.Robot();
    } catch (AWTException e) {
      e.printStackTrace();
      System.exit(-1);
    }
  }
 
  public void startCapture() {
    long start  = System.currentTimeMillis();
    int  i   = 0;
    int  fps = 0;

   while (true) {
      long current = System.currentTimeMillis();
      int seconds = (int) (current-start)/1000;
      ++i;

//      try{
//        Thread.sleep(200);
//      } catch (Exception e){
//        System.out.println("Exception sleeping.");
//      }

      if (i % 25 == 0 && seconds > 0) {
        fps = i / seconds;
        this.setTitle("FPS: " + fps);
      }
 
      Image screen_capture = robot.createScreenCapture(screenRect); // .getScaledInstance(scaleX, scaleY, Image.SCALE_FAST);
 
      label.setIcon(new ImageIcon(screen_capture));
      label.update(label.getGraphics());
    }
  }

  public static void main(String[] args) throws AWTException {
    Thread t = new Thread() {
      public void run() {
        AnimatedScreenCapture asc = new AnimatedScreenCapture();
        asc.pack();
        asc.setVisible(true);
        asc.startCapture();
      }
    };

    SwingUtilities.invokeLater(t);
  }
}