import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class DrawShapes extends JApplet
{
  private JButton choices[];
  private String names[] = {"Line", "Rectangle", "Oval"};
  private JPanel buttonPanel;
  private DrawPanel drawingArea;
  private int width = 300, height = 200;
  UIManager.LookAndFeelInfo looks[];

  public void init()
  {
    drawingArea = new DrawPanel(width, height);
    choices = new JButton[names.length];
    buttonPanel = new JPanel();
    buttonPanel.setLayout(new GridLayout(1, choices.length));
    ButtonHandler handler = new ButtonHandler();

    for(int i = 0; i < choices.length; i++)
    {
      choices[i] = new JButton(names[i]);
      buttonPanel.add(choices[i]);
      choices[i].addActionListener(handler);
    }
    Container c = getContentPane();
    c.add(buttonPanel, BorderLayout.NORTH);
    c.add(drawingArea, BorderLayout.CENTER);
    looks = UIManager.getInstalledLookAndFeels();
    try
    /*******************************************************************
    **  This changes the look and feel to Windows                     **
    **   looks[0] is Metal, looks[1] is Motif, looks[2] is Windows    **
    **   looks[3] is out of the array range for default looks.	      **
    **                                                                **
    ********************************************************************/
    { UIManager.setLookAndFeel(looks[2].getClassName()); }
    catch (Exception e)
    { e.printStackTrace(); }
    SwingUtilities.updateComponentTreeUI(this);
  }

  public void setWidth(int w)
  { width = (w >= 0 ? w : 300); }

  public void setHeight(int h)
  { height = (h >= 0 ? h : 200); }

  /*public static void main(String args[])
  {
    int width, height;

    if (args.length != 2) // no command-line arguments
    {
      width = 640;
      height = 480;
    }
    else
    {
      width = Integer.parseInt(args[0]);
      height = Integer.parseInt(args[1]);
    }

    // create window in which applet will execute
    JFrame applicationWindow =
      new JFrame("Draw Shapes");
    applicationWindow.addWindowListener(
      new WindowAdapter()
      {
        public void windowClosing(WindowEvent we)
        {
          System.exit(0);
        }
      }
    );

    // create one applet instance
    DrawShapes appletObject = new DrawShapes();
    appletObject.setWidth(width);
    appletObject.setHeight(height);

    // call applet's init and start methods
    appletObject.init();
    appletObject.start();

    // attach applet to center of window
    applicationWindow.getContentPane().add(appletObject);

    // set the windows size
    applicationWindow.setSize(width, height);

    // showing the window causes all GUI components
    // attached to the window to be painted
    applicationWindow.show();
  }*/
  private class ButtonHandler implements ActionListener
  {
    public void actionPerformed(ActionEvent ae)
    {
      for (int i = 0; i < choices.length; i++)
        if(ae.getSource() == choices[i])
        {
          drawingArea.setCurrentChoice(i);
          break;
        }
    }
  }
}

// subclass of JPanel to allow in a separate area
class DrawPanel extends JPanel
{
  private int currentChoice = -1;  // don't draw first time
  private int width = 100, height = 100;

  public DrawPanel(int w, int h)
  {
    width = (w >= 0 ? w : 100);
    height = (h >= 0 ? h : 100);
  }

  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);

    switch (currentChoice)
    {
      case 0:  g.drawLine(randomX(), randomY(), randomX(), randomY()); break;
      case 1:  g.drawRect(randomX(), randomY(), randomX(), randomY()); break;
      case 2:  g.drawOval(randomX(), randomY(), randomX(), randomY()); break;
    }
  }

  public void setCurrentChoice(int c)
  {
    currentChoice = c;
    repaint();
  }

  private int randomX()
  { return (int) (Math.random() * width); }

  private int randomY()
  { return (int) (Math.random() * height); }
}