Seleccione un área para capturar usando el mouse

Question

Estoy haciendo una aplicación de captura de pantalla basada en Java, y quiero hacerlo de modo que cuando presione una combinación de teclas en su teclado algo como this video ocurra donde seleccione y área en su pantalla, y toma una captura de pantalla del área seleccionada.

¿Cómo seleccionar un área para capturar con el mouse?

Answer 1

Comience con algo como esto.

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

/** Getting a Rectangle of interest on the screen. 
Requires the MotivatedEndUser API - sold separately. */ 
public class ScreenCaptureRectangle { 

    Rectangle captureRect; 

    ScreenCaptureRectangle(final BufferedImage screen) { 
     final BufferedImage screenCopy = new BufferedImage(
       screen.getWidth(), 
       screen.getHeight(), 
       screen.getType()); 
     final JLabel screenLabel = new JLabel(new ImageIcon(screenCopy)); 
     JScrollPane screenScroll = new JScrollPane(screenLabel); 

     screenScroll.setPreferredSize(new Dimension(
       (int)(screen.getWidth()/3), 
       (int)(screen.getHeight()/3))); 

     JPanel panel = new JPanel(new BorderLayout()); 
     panel.add(screenScroll, BorderLayout.CENTER); 

     final JLabel selectionLabel = new JLabel(
       "Drag a rectangle in the screen shot!"); 
     panel.add(selectionLabel, BorderLayout.SOUTH); 

     repaint(screen, screenCopy); 
     screenLabel.repaint(); 

     screenLabel.addMouseMotionListener(new MouseMotionAdapter() { 

      Point start = new Point(); 

      @Override 
      public void mouseMoved(MouseEvent me) { 
       start = me.getPoint(); 
       repaint(screen, screenCopy); 
       selectionLabel.setText("Start Point: " + start); 
       screenLabel.repaint(); 
      } 

      @Override 
      public void mouseDragged(MouseEvent me) { 
       Point end = me.getPoint(); 
       captureRect = new Rectangle(start, 
         new Dimension(end.x-start.x, end.y-start.y)); 
       repaint(screen, screenCopy); 
       screenLabel.repaint(); 
       selectionLabel.setText("Rectangle: " + captureRect); 
      } 
     }); 

     JOptionPane.showMessageDialog(null, panel); 

     System.out.println("Rectangle of interest: " + captureRect); 
    } 

    public void repaint(BufferedImage orig, BufferedImage copy) { 
     Graphics2D g = copy.createGraphics(); 
     g.drawImage(orig,0,0, null); 
     if (captureRect!=null) { 
      g.setColor(Color.RED); 
      g.draw(captureRect); 
      g.setColor(new Color(255,255,255,150)); 
      g.fill(captureRect); 
     } 
     g.dispose(); 
    } 

    public static void main(String[] args) throws Exception { 
     Robot robot = new Robot(); 
     final Dimension screenSize = Toolkit.getDefaultToolkit(). 
       getScreenSize(); 
     final BufferedImage screen = robot.createScreenCapture(
       new Rectangle(screenSize)); 

     SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       new ScreenCaptureRectangle(screen); 
      } 
     }); 
    } 
} 

Answer 2

Esto es muy simple de hacer:

http://www.javalobby.org/forums/thread.jspa?threadID=16400&tstart=0

http://www.javaworld.com/javaworld/jw-04-2006/jw-0424-funandgames.html