// This example is from the book "Java in a Nutshell, Second Edition".
// Written by David Flanagan.  Copyright (c) 1997 O'Reilly & Associates.
// You may distribute this source code for non-commercial purposes only.
// You may study, modify, and use this example for any purpose, as long as
// this notice is retained.  Note that this example is provided "as is",
// WITHOUT WARRANTY of any kind either expressed or implied.

// This example was modified from Scribble2.java by David Flanagan.
// The program was converted from an Applet to a standalone program.
// Modified by Matt Mahoney, mmahoney@cs.fit.edu

// No need to import java.applet
import java.awt.*;
import java.awt.event.*;

// Extend Frame instead of Applet
public class Scribble3 extends Frame
                      implements MouseListener,  MouseMotionListener {
  private int last_x, last_y;

  // Change init() to a constructor
  public Scribble3() {
    // Tell this applet what MouseListener and MouseMotionListener
    // objects to notify when mouse and mouse motion events occur.
    // Since we implement the interfaces ourself, our own methods are called.
    // (unchanged).
    this.addMouseListener(this);
    this.addMouseMotionListener(this);
  }

  // A method from the MouseListener interface.  Invoked when the
  // user presses a mouse button (unchanged).
  public void mousePressed(MouseEvent e) {
    last_x = e.getX();
    last_y = e.getY();
  }

  // A method from the MouseMotionListener interface.  Invoked when the
  // user drags the mouse with a button pressed (unchanged).
  public void mouseDragged(MouseEvent e) {
    Graphics g = this.getGraphics();
    int x = e.getX(), y = e.getY();
    g.drawLine(last_x, last_y, x, y);
    last_x = x; last_y = y;
  }

  // The other, unused methods of the MouseListener interface (unchanged).
  public void mouseReleased(MouseEvent e) {;}
  public void mouseClicked(MouseEvent e) {;}
  public void mouseEntered(MouseEvent e) {;}
  public void mouseExited(MouseEvent e) {;}

  // The other method of the MouseMotionListener interface (unchanged).
  public void mouseMoved(MouseEvent e) {;}

  // Add main() to create a new Scribble3 and show it
  public static void main(String[] args) {

    // Create the top level window (still hidden)
    Scribble3 scribble3=new Scribble3();

    // Add a handler to detect window closing (user clicks on [X]).
    // We could also use the this method to detect mouse events.
    scribble3.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        e.getWindow().dispose();  // close the window
        System.exit(0);  // end the program
      }
    });

    // Make the window visible
    scribble3.setSize(400, 300);
    scribble3.show();
  }
}