Drawing a rectangle on an Image embedded in a JLabel

Question

hey everybody,
I'm trying to implement a program that can select parts of an image using a rectangle that's formed while the mouse is dragging. The image is embedded within the JLabel and I have already overriden the paintcomponents method. So far, I'm able to draw lines and shapes on the image before the program runs. But I need to be able to draw in real time and I don't know how to do that. Can someone please help me? Thanks a lot.
Here's my code if anyone wants to look at it:
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
import javax.imageio.*;
public class test{
     static int x1, y1, x2,y2;
     static boolean drawing;     
     static Graphics gr;
     public static void main(String[] args){
     JFrame jframe = new JFrame();
     jframe.setSize(1000,800);
     jframe.setVisible(true);
          WindowListener c = new WindowAdapter() {
               public void windowClosing(WindowEvent e) {
                    System.exit(0);
          jframe.addWindowListener(c);
     ImageIcon icon = new ImageIcon("c:/60.jpg");
     Image i = icon.getImage();
     JLabel lab = new JLabel(icon)
          public void paintComponent(Graphics gr) {
                    super.paintComponent(gr);               
                    paints(gr);          
     MouseMotionListener drag = new MouseMotionAdapter() {
                    public void mouseDragged(MouseEvent e) {
                         x2 = e.getX();
                         y2 = e.getY();
                         drawing = true;
                         //System.out.println(e.getX()+" "+e.getY());
     MouseListener click = new MouseAdapter() {
               public void mousePressed(MouseEvent e) {
                    x1 = e.getX();
                    y1 = e.getY();
                    drawing = true;
               public void mouseReleased(MouseEvent e) {
                    x2 = e.getX();
                    y2 = e.getY();
                    drawing = false;
     lab.addMouseMotionListener(drag);
     lab.addMouseListener(click);
     JPanel pan = new JPanel();
     pan.add(lab);
     jframe.getContentPane().add(pan);
     jframe.setVisible(true);
public static void paints (Graphics gr)
     Graphics2D write = (Graphics2D)gr;
               write.setColor(Color.BLUE);
               int x3 = Math.abs(x1-x2);
               int y3 = Math.abs(y1-y2);
               write.drawRect(x1,y1,x3,y3);
}

Answer 1

hey everybody,
I'm trying to implement a program that can select parts of an image using a rectangle that's formed while the mouse is dragging. The image is embedded within the JLabel and I have already overriden the paintcomponents method. So far, I'm able to draw lines and shapes on the image before the program runs. But I need to be able to draw in real time and I don't know how to do that. Can someone please help me? Thanks a lot.
Here's my code if anyone wants to look at it:
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
import javax.imageio.*;
public class test{
     static int x1, y1, x2,y2;
     static boolean drawing;     
     static Graphics gr;
     public static void main(String[] args){
     JFrame jframe = new JFrame();
     jframe.setSize(1000,800);
     jframe.setVisible(true);
          WindowListener c = new WindowAdapter() {
               public void windowClosing(WindowEvent e) {
                    System.exit(0);
          jframe.addWindowListener(c);
     ImageIcon icon = new ImageIcon("c:/60.jpg");
     Image i = icon.getImage();
     JLabel lab = new JLabel(icon)
          public void paintComponent(Graphics gr) {
                    super.paintComponent(gr);               
                    paints(gr);          
     MouseMotionListener drag = new MouseMotionAdapter() {
                    public void mouseDragged(MouseEvent e) {
                         x2 = e.getX();
                         y2 = e.getY();
                         drawing = true;
                         //System.out.println(e.getX()+" "+e.getY());
     MouseListener click = new MouseAdapter() {
               public void mousePressed(MouseEvent e) {
                    x1 = e.getX();
                    y1 = e.getY();
                    drawing = true;
               public void mouseReleased(MouseEvent e) {
                    x2 = e.getX();
                    y2 = e.getY();
                    drawing = false;
     lab.addMouseMotionListener(drag);
     lab.addMouseListener(click);
     JPanel pan = new JPanel();
     pan.add(lab);
     jframe.getContentPane().add(pan);
     jframe.setVisible(true);
public static void paints (Graphics gr)
     Graphics2D write = (Graphics2D)gr;
               write.setColor(Color.BLUE);
               int x3 = Math.abs(x1-x2);
               int y3 = Math.abs(y1-y2);
               write.drawRect(x1,y1,x3,y3);
}