import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.event.MouseInputAdapter;
import java.awt.BorderLayout;
import java.util.Observer;
import javax.swing.JFrame;
import javax.swing.JComponent;
import java.awt.Graphics;
import java.awt.Graphics2D;                          
import java.awt.Point;
import java.awt.Color;
import java.awt.Rectangle;
import java.awt.Font;
import java.awt.BasicStroke;
import java.awt.Component;
import java.awt.geom.Point2D;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D; 
import java.awt.geom.Ellipse2D;   
import java.awt.font.TextLayout;  

public class DragandDropImproved {
  private static JFrame window;              // The application window
  private static Board view;                        // The view of the sketch
  static MouseHandler mouseHandler;
  static boolean picked = false;  // true if rect has been picked
  static double dx, dy;          // difference between location of cursor and location of rect
  static Point2D.Double corner = new Point2D.Double(50.0,50.0);  //corner of rect
  static Rectangle2D.Double rect = new Rectangle2D.Double(corner.getX(),corner.getY(),140.0,100.0);

  public static void main(String[] args) {

    window = new JFrame("Drag and Drop a Rectangle (using XOR)");    // Create the app window
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);      // Default is exit the application
    Toolkit theKit = window.getToolkit();        // Get the window toolkit
    Dimension wndSize = theKit.getScreenSize();  // Get screen size
    // Set the position to screen center & size to half screen size
    window.setBounds(wndSize.width/4, wndSize.height/4,        // Position
                     wndSize.width/2, wndSize.height/2);       // Size

    view = new Board();              // Create the view
    mouseHandler = new MouseHandler();
    view.addMouseListener(mouseHandler);
    view.addMouseMotionListener(mouseHandler);

    window.getContentPane().add(view, BorderLayout.CENTER);
    window.setVisible(true);
    } 
  static class Board extends JComponent{
    public void paint(Graphics g) {
      g2D = (Graphics2D)g;             // Get a 2D device context
      g2D.setPaint(color);
      g2D.draw(rect);
      g2D.fill(rect);
      g2D.setFont(new Font("Arial", Font.PLAIN, 18));
      g2D.draw(new Line2D.Float(240.0f, 120.0f, 80.0f, 200.0f));
      g2D.draw(new Ellipse2D.Double(220.0,100.0,40.0,40.0));
      g2D.setPaint(Color.RED);
      g2D.drawString("Thanksgiving",70,100);
    }
    // draw the rectangle (border only) using XOR mode
    public void drawRect() {
      g2D = (Graphics2D)getGraphics();
      g2D.setXORMode(getBackground());
      g2D.setPaint(color);

      float dash1[] = { 10.0f };
      BasicStroke dashed = new BasicStroke(1.0f,
        BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, dash1, 0.0f);
      g2D.setStroke(dashed);  

      g2D.draw(rect);
    }

    public Color color = Color.GREEN;

    private Graphics2D g2D = null;              // Temporary graphics context
  }

  static class MouseHandler extends MouseInputAdapter {
    // remember location of rect relative to cursor if selected with left mouse button
    public void mousePressed(MouseEvent e) {  
      if (rect.contains(e.getX(), e.getY()) &&
          e.getButton() == MouseEvent.BUTTON1) {
        picked = true;
        dx = corner.getX() - e.getX();
        dy = corner.getY() - e.getY();  
      }
    }
    // redraw rectangle if picked
    public void mouseDragged(MouseEvent e) {
      if (picked) {
        view.drawRect();
        corner.setLocation(e.getX() + dx,e.getY() + dy);
        rect = new Rectangle2D.Double(corner.getX(),corner.getY(),140.0,100.0);
        view.drawRect();
      } 
    }
    // redraw picture
    public void mouseReleased(MouseEvent e) {
      if (picked) {
        picked = false;  
        corner.setLocation(e.getX() + dx,e.getY() + dy);
        rect = new Rectangle2D.Double(corner.getX(),corner.getY(),140,100);
        view.repaint();
      } 
    }
  }
}