Java AWT Graphics2D draw with mouse

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.GeneralPath;
import java.awt.geom.Path2D;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JPanel implements MouseListener, MouseMotionListener {

  Path2D oneDrawing = new Path2D.Double();
  List<Path2D> drawings = new ArrayList<>();
  private Point2D anchorPt;

  @Override//  ww  w. j  ava 2  s .  c  om
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);

    Graphics2D g2d = (Graphics2D) g;
    g2d.setBackground(Color.WHITE);
    g2d.clearRect(0, 0, getParent().getWidth(), getParent().getHeight());
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    g2d.setPaint(Color.BLACK);
    if (oneDrawing != null) {
      g2d.draw(oneDrawing);
    }
    for (Path2D gp : drawings) {
      g2d.draw(gp);
    }

  }

  @Override
  public void mouseClicked(MouseEvent e) {
  }

  @Override
  public void mousePressed(MouseEvent e) {
    anchorPt = (Point2D) e.getPoint().clone();
    oneDrawing = new GeneralPath();
    oneDrawing.moveTo(anchorPt.getX(), anchorPt.getY());
    repaint();
  }

  @Override
  public void mouseReleased(final MouseEvent e) {
    if (anchorPt != null) {
      drawings.add(oneDrawing);
      oneDrawing = null;
    }
    repaint();
  }

  @Override
  public void mouseEntered(MouseEvent e) {
  }

  @Override
  public void mouseExited(MouseEvent e) {
  }

  @Override
  public void mouseDragged(MouseEvent e) {
    oneDrawing.lineTo(e.getX(), e.getY());
    repaint();
  }

  @Override
  public void mouseMoved(MouseEvent e) {
  }

  public static void main(String[] args) {
    final Main c = new Main();
    c.addMouseListener(c);
    c.addMouseMotionListener(c);
    c.setPreferredSize(new Dimension(409, 726));
    JFrame frame = new JFrame("java2s.com");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.add(c);
    frame.setSize(300, 250);
    frame.setVisible(true);
  }
}