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

class MainCanvas extends Canvas
{
   private String _strText = null;

   private String _strFace = "Dialog";
   private String _strStyle = "Plain";
   private String _strSize = "24";

   public MainCanvas(String strText)
   {
      _strText = strText;
   }

   public void notify(String strFace, String strStyle, String strSize)
   {
      _strFace = strFace;
      _strStyle = strStyle;
      _strSize = strSize;

      repaint();
   }

   public void paint(Graphics g)
   {
      // we must manually blank out the background ourselves in order
      // to avoid bugs in some implementations of the AWT...

      g.setColor(Color.white);

      g.fillRect(0, 0, size().width, size().height);

      // determine the parameters of the new font

      int nStyle = Font.PLAIN;

      if (_strStyle.equals("Bold")) nStyle = Font.BOLD;
      if (_strStyle.equals("Italic")) nStyle = Font.ITALIC;

      int nSize = 24;

      try
      {
         nSize = Integer.parseInt(_strSize);
      }
      catch (NumberFormatException e)
      {
         nSize = 24;
      }

      // create and set the new font

      Font f = new Font(_strFace, nStyle, nSize);

      g.setFont(f);

      // get its metrics

      FontMetrics fm1 = g.getFontMetrics();

      int a1 = fm1.getAscent();

      int l1 = fm1.getLeading();

      int d1 = fm1.getDescent();

      int w1 = fm1.stringWidth(_strText);

      int x1 = (size().width - w1) / 2;

      // draw baseline, ascent, and descent

      g.setColor(Color.black);

      g.drawLine(x1 - 10, 100, x1 + 10 + w1, 100);
      g.drawLine(x1 - 10, 101, x1 + 10 + w1, 101);

      g.drawLine(x1 - 10, 100 - a1, x1 + 10 + w1, 100 - a1);

      g.drawLine(x1 - 10, 100 + d1, x1 + 10 + w1, 100 + d1);

      // draw "ascent" and "descent"

      g.setFont(new Font("Dialog", Font.PLAIN, 12));

      FontMetrics fm2 = g.getFontMetrics();

      int w2 = fm2.stringWidth("ascent");

      g.drawString("ascent", x1 + 10 + w1 - w2, 100 - a1 - 2);

      w2 = fm2.stringWidth("descent");

      int a2 = fm2.getAscent();

      g.drawString("descent", x1 + 10 + w1 - w2, 100 + d1 + a2 + 2);

      // draw the width lines

      int x = x1;

      for (int i = 0; i < _strText.length() && x < x1 + 10 + w1 - w2; i++)
      {
         g.drawLine(x, 105, x, 95 - a1);

         x += fm1.charWidth(_strText.charAt(i));
      }
      
      // draw the text

      g.setFont(f);

      g.setColor(Color.blue);

      g.drawString(_strText, x1, 100);
   }
}

public class Main extends Applet
{
   private MainCanvas can = null;

   private Choice chFace = new Choice();
   private Choice chStyle = new Choice();
   private Choice chSize = new Choice();

   public void init()
   {
      char [] rgc = { 'A', 'a', 'F', 'f', 'G', 'g', 115, 125, 200, 221, 189 };

      can = new MainCanvas(new String(rgc));

      setLayout(new BorderLayout());

      setBackground(Color.white);

      // create the font menu

      String [] rgstr = getToolkit().getFontList();

      for (int i = 0; i < rgstr.length; i++) chFace.addItem(rgstr[i]);

      // create the style menu

      chStyle.addItem("Plain");
      chStyle.addItem("Italic");
      chStyle.addItem("Bold");

      // create the size menu

      for (int j = 12; j < 30; j++) chSize.addItem(String.valueOf(j * 2));

      chSize.select("36");

      Panel p = new Panel();

      p.add(chFace);
      p.add(chStyle);
      p.add(chSize);

      add("North", p);

      add("Center", can);

      can.notify(chFace.getSelectedItem(), chStyle.getSelectedItem(),
                 chSize.getSelectedItem());
   }

   public Dimension preferredSize()
   {
      return new Dimension(500, 300);
   }

   public boolean action(Event e, Object o)
   {
      if (e.target == chFace || e.target == chStyle || e.target == chSize)
      {
         can.notify(chFace.getSelectedItem(), chStyle.getSelectedItem(),
                    chSize.getSelectedItem());

         return true;
      }

      return false;
   }

   public static void main(String [] args)
   {
      Frame f = new Frame("Main");

      Main m = new Main();

      m.init();

      f.add("Center", m);

      f.pack();
      f.show();
   }
}