[JAVA] JAVA DRAG

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.Rectangle2D;

import java.util.ArrayList;

import java.util.List;

public class DragPanel extends JPanel implements MouseListener, MouseMotionListener {

    private List<DraggableShape> shapes = new ArrayList<>();

    private DraggableShape selectedShape = null;

    private double offsetX, offsetY;

    public DragPanel() {

        // Add a sample shape

        shapes.add(new DraggableShape(new Rectangle2D.Double(50, 50, 100, 75), Color.BLUE));

        addMouseListener(this);

        addMouseMotionListener(this);

    }

    @Override

    protected void paintComponent(Graphics g) {

        super.paintComponent(g);

        Graphics2D g2 = (Graphics2D) g;

        for (DraggableShape shape : shapes) {

            g2.setColor(shape.getColor());

            g2.draw(shape.getShape());

        }

    }

    @Override

    public void mousePressed(MouseEvent e) {

        double mx = e.getX();

        double my = e.getY();

        for (DraggableShape shape : shapes) {

            if (shape.getShape().contains(mx, my)) {

                selectedShape = shape;

                offsetX = mx - shape.getShape().getX();

                offsetY = my - shape.getShape().getY();

                break;

            }

        }

    }

    @Override

    public void mouseDragged(MouseEvent e) {

        if (selectedShape != null) {

            double newX = e.getX() - offsetX;

            double newY = e.getY() - offsetY;

            Rectangle2D currentShape = (Rectangle2D) selectedShape.getShape();

            currentShape.setFrame(newX, newY, currentShape.getWidth(), currentShape.getHeight());

            repaint();

        }

    }

    @Override

    public void mouseReleased(MouseEvent e) {

        selectedShape = null;

    }

    // Unused MouseListener/MouseMotionListener methods

    @Override public void mouseClicked(MouseEvent e) {}

    @Override public void mouseEntered(MouseEvent e) {}

    @Override public void mouseExited(MouseEvent e) {}

    @Override public void mouseMoved(MouseEvent e) {}

    // Helper class for draggable shapes

    private static class DraggableShape {

        private Shape shape;

        private Color color;

        public DraggableShape(Shape shape, Color color) {

            this.shape = shape;

            this.color = color;

        }

        public Shape getShape() { return shape; }

        public Color getColor() { return color; }

    }

    public static void main(String[] args) {

        JFrame frame = new JFrame("Drag Example");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(new DragPanel());

        frame.setSize(400, 300);

        frame.setLocationRelativeTo(null);

        frame.setVisible(true);

    }

}