Java - перемещение выделенного объекта из JFrame

Question

Я работаю над заданным проектом, который похож на программу Paint в Windows.Я создал кнопки, которые помогли мне нарисовать круги, прямоугольники, помогли очистить рамку и т. Д. Но я столкнулся с главной проблемой.Я хочу выделить мышью какой-нибудь регион, который я мог бы перемещать по рамке.Вот код:

    package StreamProject;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;


import javax.swing.*;
import javax.swing.filechooser.FileSystemView;

public class Paint extends JPanel implements MouseListener, ActionListener, MouseMotionListener
{
    BufferedImage grid;
    Graphics2D gc;
    private static final long serialVersionUID = 1L;
    public static int stroke, eraser = 0;
    private int xX1, yY1, xX2, yY2, choice;             // choice
    private static final Color BACKGROUND_COLOR = Color.WHITE;  // set background  as white
    private int eraserW = 50;                   // the eraser width is set to 50
    private int eraserH = 50;                   // the eraser height is set to 50

Paint()
{

JFrame frame = new JFrame("PaintProgram");
frame.setSize(1200, 800);

frame.setBackground(BACKGROUND_COLOR);
frame.getContentPane().add(this);

JMenuBar menuBar = new JMenuBar();
frame.setJMenuBar(menuBar);                     // this wll create a menu bar
JMenu opt = new JMenu("Options");
menuBar.add(opt);


JMenuItem item = new JMenuItem ("New");

    item = new JMenuItem ("Open new window");              opt.add(item);
    item.addActionListener(this);
    item = new JMenuItem("Save");         opt.add(item);
    item.addActionListener(this);

    item = new JMenuItem("Quit");   opt.add(item);

    item.addActionListener(this);

JButton pickUp = new JButton("Pick up image");
    pickUp.addActionListener(this);
JButton b1 = new JButton("Clear Drawing");
    b1.addActionListener(this);                 // button 1 passed to every ActionListener object that registered using addActionListener
JButton color = new JButton("Color");
    color.addActionListener(this);
JButton erase = new JButton("Erase");               // this button is set as Eraser
    erase.addActionListener(this);
JButton b2 = new JButton("Rect");             // this button is set as  Rect
    b2.addActionListener(this);                 // button 2 passed to every ActionListener object that registered using addActionListener
JButton b3 = new JButton("oval");             // this button is set as  Oval
    b3.addActionListener(this);                 // button 3 passed to every ActionListener object that registered using addActionListener
JButton b4 = new JButton("Line");               // this button is set as Line
    b4.addActionListener(this);                     // button 4 passed to every ActionListener object that registered using addActionListener
JRadioButton medium = new JRadioButton("Medium Line");      // there are radio button to choose Medium Line
    medium.addActionListener(this);
JRadioButton thick = new JRadioButton("Thick Line");        // there are radio button to choose Thick Line
    thick.addActionListener(this);

ButtonGroup lineOption = new ButtonGroup();
    lineOption.add(medium);                     // line for medium
    lineOption.add(thick);                      // line for thick
  this.add(pickUp);
  this.add(b1);
  this.add(color);
  this.add(erase);
  this.add(b2);
  this.add(b3);
  this.add(b4);
  this.add(medium);
  this.add(thick);
  addMouseListener(this);                     // receiving an event from the mouse
  frame.setVisible(true);                     // this frame is set visible to user
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       // the operation will automatically off when user clicked exit button

}

  public void paintComponent(Graphics g)
  {
  super.paintComponent(g);
  Graphics2D g2 = (Graphics2D) g;
   if (grid == null)
   {
    int w = this.getWidth();                        // width
    int h = this.getHeight();                       // height
     grid = (BufferedImage) (this.createImage(w, h));
     gc = grid.createGraphics();
      gc.setColor(Color.BLUE);
   }

   g2.drawImage(grid, null, 0, 0);
  check();
}

  public void draw()
  {
   Graphics2D g = (Graphics2D) getGraphics();
   int w = xX2 - xX1;
   if (w < 0)
   w = w * (-1);

    int h = yY2 - yY1;
     if (h < 0)
     h = h * (-1);

    if(choice == 1)
    {
        check();
        gc.drawRect(xX1, yY1, w, h);
        repaint();
    }

    else if(choice == 2)
    {
        check();
        gc.drawOval(xX1, yY1, w, h);
        repaint();
    }

    else if(choice == 3)
    {
        if (stroke == 0)
        gc.setStroke(new BasicStroke(3));
        if (stroke == 1)
            gc.setStroke(new BasicStroke(6));
            gc.drawLine(xX1, yY1, xX2, yY2);
            repaint();
    }

    else if(choice == 4)
    {
        repaint();
        Color temp = gc.getColor();
        gc.setColor(BACKGROUND_COLOR);
        gc.fillRect(0, 0, getWidth(), getHeight());
        gc.setColor(temp);
        repaint();
    }


    else
    {
        if (eraser == 1)
            gc.clearRect(xX1, yY1, w, h);
    }
  }

        public void check()
         {
         if (xX1 > xX2)
           {
            int z = 0;
             z = xX1;
             xX1 = xX2;
             xX2 = z;
           }
         if (yY1 > yY2)
         {
          int z = 0;
          z = yY1;
          yY1 = yY2;
          yY2 = z;
         }
         }
//  public void saveMap() {
//      String sb = "TEST CONTENT";
//      JFileChooser chooser = new JFileChooser();
//      chooser.setCurrentDirectory(new File("/home/hikmet/Desktop"));
//      int retrival = chooser.showSaveDialog(null);
//      if (retrival == JFileChooser.APPROVE_OPTION) {
//          try(FileWriter fw = new FileWriter(chooser.getSelectedFile()+".png")) {
//              fw.write(sb.toString());
//          } catch (IOException e) {
//              e.printStackTrace();
//          }
//      }
//  }


    public void actionPerformed(ActionEvent e)
    {

        super.removeMouseMotionListener(this);

        if (e.getActionCommand().equals("Color"))
        {
            Color bgColor = JColorChooser.showDialog(this, "Choose Background Color", getBackground());
            if (bgColor != null)
                gc.setColor(bgColor);
  }

  if (e.getActionCommand().equals("Quit")){
        System.exit(0);
  }

  if (e.getActionCommand().equals("Save")){
//    saveMap();
  }

  if (e.getActionCommand().equals("Open new window")){
     new Paint();
  }

  if (e.getActionCommand().equals("Pick up image")){

  }

    if (e.getActionCommand().equals("Rect")) { choice = 1; }

    if (e.getActionCommand().equals("oval")) { choice = 2; }

    if (e.getActionCommand().equals("Line")) { choice = 3; }

    if (e.getActionCommand().equals("Medium Line")) { stroke = 0; }

    if (e.getActionCommand().equals("Thick Line")) { stroke = 1; }

    if (e.getActionCommand().equals("Erase")) { eraser = 1; choice = 5; super.addMouseMotionListener(this); }

    if (e.getActionCommand().equals("Clear Drawing")) { choice = 4;draw(); }

}

public void mouseExited(MouseEvent e) { }
public void mouseEntered(MouseEvent e) { }
public void mouseClicked(MouseEvent e) { }
public void mousePressed(MouseEvent e) { xX1 = e.getX(); yY1 = e.getY(); }

public void mouseReleased(MouseEvent e) { xX2 = e.getX(); yY2 = e.getY(); draw(); eraser = 0; }

public void mouseDragged(MouseEvent re)
{
      Color c = gc.getColor();
      gc.setColor(BACKGROUND_COLOR);
      gc.drawRect(re.getX(), re.getY(), eraserW, eraserH);
      gc.setColor(c);
      repaint();
}

public void mouseMoved(MouseEvent arg0)
{
}



}

Я хочу на самом деле поместить весь обработчик событий в данный фрагмент кода:

    if (e.getActionCommand().equals("Pick up image")){

  }

Кто-нибудь может мне помочь, пожалуйста?