// File: TestAwt28.java (Module 9)
//
// Author: Rahul Simha
// Created: October 21, 1998
//
// Update.

import java.awt.*;
import java.awt.event.*; // Needed for ActionListener.

class NewFrame extends Frame 
  implements ActionListener, MouseListener {

  // Constructor.
  public NewFrame (int width, int height)
  {
    // Set the title and other frame parameters.
    this.setTitle ("Paint and Update");
    this.setResizable (true);
    this.setBackground (Color.cyan);
    this.setSize (width, height);

    // Create a quit button.
    Button b = new Button ("Quit");
    b.setBackground (Color.red);
    b.setFont (new Font ("Serif", Font.PLAIN | Font.BOLD, 15));
    b.addActionListener (this);
    // this.setLayout (new BorderLayout());
    this.add (b, BorderLayout.SOUTH);

    // Add mouse-listening to the frame itself.
    this.addMouseListener (this);

    // Show the frame.
    this.setVisible (true);
  }

  // This method is required to implement the 
  // ActionListener interface.
  public void actionPerformed (ActionEvent a)
  {
    // Button must have been pressed - so really quit.
    System.exit (0);
  }

  int current_x=0, current_y=0;
  int new_x, new_y;

  // These methods are required to implement 
  // the MouseListener interface.
  public void mouseClicked (MouseEvent m)
  {
    new_x = m.getX();
    new_y = m.getY();
    Graphics g = this.getGraphics();
    paint (g); 
  }

  public void mouseEntered (MouseEvent m) {}
  public void mouseExited (MouseEvent m) {}
  public void mousePressed (MouseEvent m) {}
  public void mouseReleased (MouseEvent m) {}

  public void paint (Graphics g)
  {
    System.out.println ("Paint: cx=" + current_x + ",cy=" + current_y
			+ ", nx=" + new_x + ",ny=" + new_y);
    g.drawLine (current_x, current_y, new_x, new_y);
    current_x = new_x;
    current_y = new_y;
  }

  // Override update() and make sure the
  // background is not cleared.
  public void update (Graphics g)
  {
    paint (g);
  }

} // End of class "NewFrame"


public class TestAwt28 {

  public static void main (String[] argv)
  {
    NewFrame nf = new NewFrame (300, 200);
  }

}