选择一个区域使用鼠标捕获(Select an area to capture using the m

我在做一个基于Java的截屏的应用，我想使它所以当你把你的键盘按键的东西的组合像这部影片发生在其中选择和你的屏幕上区域，它需要的屏幕截图选择的区域。

如何选择区域使用鼠标来捕捉？

Answer 1:

开始是这样的。

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:

这是很简单的事：

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

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