DragPanel.java

package DragAndDrop;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;


public class DragPanel extends JPanel {

    ImageIcon image = new ImageIcon("D:\\codeME\\JavaME\\OpenANewGui\\src\\DragAndDrop\\gas.png");
    final int WIDTH = image.getIconWidth();
    final int HEIGHT = image.getIconHeight();
    Point imageCorner;
    Point prevPt;

    DragPanel() {
        imageCorner = new Point(0,0);
        ClickListener clickListener = new ClickListener();
        DragListener dragListener = new DragListener();

        this.addMouseListener(clickListener);
        this.addMouseMotionListener(dragListener);

    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        image.paintIcon(this,g,(int)imageCorner.getX(),(int)imageCorner.getY());

    }

    private class ClickListener extends MouseAdapter {
        public void mousePressed(MouseEvent e){
            prevPt = e.getPoint();
        }

    }

    private class DragListener extends MouseMotionAdapter {
        public void mouseDragged(MouseEvent e) {
            Point currentPt = e.getPoint();
            imageCorner.translate(
                    (int) (currentPt.getX() - prevPt.getX()),
                    (int) (currentPt.getY() - prevPt.getY()));
            prevPt = currentPt;
            repaint();
        }
        }

}