java 擷取滑鼠選中内容_java – 使用滑鼠選擇要捕獲的區域

從這樣的事情開始.

import java.awt.*;

import java.awt.event.*;

import java.awt.image.*;

import javax.swing.*;

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);

}

});

}

}