// File: TestApplet.java (Module 9b)
//
// Author: Rahul Simha
// Created: October 21, 2000
//
// Panels - in an applet.

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

public class TestApplet extends Applet
  implements ActionListener, MouseListener {

  // Data.
  Button quitB, orangeB, greenB;
  Panel p;
  Canvas c;
  int currentX = 0,  currentY = 0;
  Color currentColor = Color.green;

  // Applet's equivalent of constructor.
  public void init()
  {
    // Title and size cannot be set in an applet.
    this.setBackground (Color.cyan);

    // Create a quit button: using AWT's Button.
    quitB = new Button ("Quit");
    quitB.setBackground (Color.red);
    quitB.setFont (new Font ("Serif", Font.PLAIN | Font.BOLD, 15));
    quitB.addActionListener (this);

    // Default for an applet is FlowLayout.
    this.setLayout (new BorderLayout());
    this.add (quitB, BorderLayout.SOUTH);

    // Create a white canvas using java.awt.Canvas.
    c = new Canvas ();
    c.setBackground (Color.white);
    c.setForeground (Color.blue);
    c.addMouseListener (this);

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

    // Create a Panel
    p = new Panel ();
    p.setLayout (new FlowLayout());
    p.setBackground (Color.white);

    // Create a clear button.
    orangeB = new Button ("Orange");
    orangeB.addActionListener (this);
    orangeB.setBackground (Color.orange);

    // Create a start button.
    greenB = new Button ("Green");
    greenB.addActionListener (this);
    greenB.setBackground (Color.green);

    // Add start and clear buttons to panel.
    p.add (orangeB);
    p.add (greenB);

    // Now add the panel to the frame.
    this.add (p, BorderLayout.NORTH);

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

  // This method is required to implement the 
  // ActionListener interface.
  public void actionPerformed (ActionEvent a)
  {
    String s = a.getActionCommand();
    if (s.equalsIgnoreCase ("Quit"))
      System.exit(0);
    else if (s.equalsIgnoreCase ("Orange")) {
      currentColor = Color.orange;
    }
    else if (s.equalsIgnoreCase ("Green")) {
      currentColor = Color.green;
    }
  }


  // These methods are required to implement 
  // the MouseListener interface.
  public void mouseClicked (MouseEvent m)
  {
    int x = m.getX();
    int y = m.getY();
    Graphics g = c.getGraphics();
    g.setColor (currentColor);
    g.drawLine (currentX, currentY, x, y);
    currentX = x;
    currentY = y;
  }

  // We need to implement these methods, but
  // don't actually have to do anything inside.
  public void mouseEntered (MouseEvent m) {}
  public void mouseExited (MouseEvent m) {}
  public void mousePressed (MouseEvent m) {}
  public void mouseReleased (MouseEvent m) {}

} // End of class "TestApplet"