// File: TwoCanvas6.java (Module 10)
//
// Author: Rahul Simha
// Created: November 2, 1998
//
// Two canvases - using anonymous classes.

import java.awt.*;
import java.awt.event.*; 

class NewFrame extends Frame {

  // Data.
  Button quitb;
  Button clearb1, clearb2;
  Canvas c1, c2;
  Panel outerpanel, p1, p2;
  Point c1_current = new Point (0,0);
  Point c2_current = new Point (0,0);

  // Constructor.
  public NewFrame (int width, int height)
  {
    // Set the title and other frame parameters.
    this.setTitle ("Two canvas example");
    this.setResizable (true);
    this.setBackground (Color.cyan);
    this.setSize (width, height);
    // this.setLayout (new BorderLayout());

    // Create a quit button for the whole frame.
    quitb = new Button ("Quit");
    quitb.setBackground (Color.red);
    quitb.setFont (new Font ("Serif", Font.PLAIN | Font.BOLD, 15));

    // Using an anonymous class:
    quitb.addActionListener (
      new ActionListener() {
        public void actionPerformed (ActionEvent a) 
        {
	  System.exit(0);
        }
      }
    );

    this.add (quitb, BorderLayout.SOUTH);

    // Create a Panel for the first canvas
    p1 = new Panel ();
    p1.setLayout (new BorderLayout());

    // Create a white canvas.
    c1 = new Canvas ();
    c1.setBackground (Color.white);
    c1.setForeground (Color.blue);

    // Create a MouseListener class:
      class CanvasMouseListener extends MouseAdapter {
        Canvas c;
        Point current;

        // Constructor.
        public CanvasMouseListener (Canvas c, Point current)
        {
	  this.c = c;   this.current = current;
        }

        // Handle a mouse click.
        public void mouseClicked (MouseEvent m)
        {
	  int x = m.getX();
	  int y = m.getY();
	  Graphics g = c.getGraphics();
	  g.drawLine (current.x, current.y, x, y);
	  current.x = x;
	  current.y = y;
        }
      }
  
    c1.addMouseListener (new CanvasMouseListener(c1, c1_current));

    // Add canvas to frame in the center.
    p1.add (c1, BorderLayout.CENTER);

    // Create a clear button.
    clearb1 = new Button ("Clear");
    clearb1.setBackground (Color.green);

    // First create a listener class.
      class ClearActionListener implements ActionListener {
        Canvas c;
        Point current;

        // Constructor.
        public ClearActionListener (Canvas c, Point current)
        {
	  this.c = c;   this.current = current;
        }

        // Handle button-press.
        public void actionPerformed (ActionEvent a) 
        {
	  c.setBackground (Color.white);
  	  c.repaint ();
	  current.x = current.y = 0;
        }
      }

    clearb1.addActionListener (new ClearActionListener(c1, c1_current));
    p1.add (clearb1, BorderLayout.NORTH);

    // Create a Panel for the second canvas.
    p2 = new Panel ();
    p2.setLayout (new BorderLayout());

    // Create a second white canvas.
    c2 = new Canvas ();
    c2.setBackground (Color.white);
    c2.setForeground (Color.blue);

    // Add a new instance of the MouseListener.
    c2.addMouseListener (new CanvasMouseListener(c2, c2_current));

    // Add canvas to frame in the center.
    p2.add (c2, BorderLayout.CENTER);

    // Create a second clear button.
    clearb2 = new Button ("Clear");
    clearb2.setBackground (Color.green);

    // Pass a new instance of the action listener.
    clearb2.addActionListener (new ClearActionListener(c2, c2_current));
    p2.add (clearb2, BorderLayout.NORTH);

    // A panel to hold the smaller panels.
    outerpanel = new Panel ();
    outerpanel.setLayout (new GridLayout (1,2,5,5));
    outerpanel.add(p1);
    outerpanel.add(p2);

    // Now add the panel to the frame.
    this.add (outerpanel, BorderLayout.CENTER);

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

} // End of class "NewFrame"


public class TwoCanvas6 {

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

}