metrics.java

经典的<<C how to program>一书第三版的例程。非常适合于C的初学者。

// Fig. 28.12: Metrics.java
// Demonstrating methods of class FontMetrics and
// class Graphics useful for obtaining font metrics
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Metrics extends JFrame {
   public Metrics()
   {
      super( "Demonstrating FontMetrics" );
      
      setSize( 510, 210 );
      show();
   }

   public void paint( Graphics g )             
   {
      g.setFont( new Font( "SansSerif", Font.BOLD, 12 ) );
      FontMetrics fm = g.getFontMetrics();
      g.drawString( "Current font: " + g.getFont(), 10, 40 );
      g.drawString( "Ascent: " + fm.getAscent(), 10, 55 );
      g.drawString( "Descent: " + fm.getDescent(), 10, 70 );
      g.drawString( "Height: " + fm.getHeight(), 10, 85 );
      g.drawString( "Leading: " + fm.getLeading(), 10, 100 );

      Font font = new Font( "Serif", Font.ITALIC, 14 );
      fm = g.getFontMetrics( font );
      g.setFont( font );
      g.drawString( "Current font: " + font, 10, 130 );
      g.drawString( "Ascent: " + fm.getAscent(), 10, 145 );
      g.drawString( "Descent: " + fm.getDescent(), 10, 160 );
      g.drawString( "Height: " + fm.getHeight(), 10, 175 );
      g.drawString( "Leading: " + fm.getLeading(), 10, 190 );
   }

   public static void main( String args[] )
   {
      Metrics app = new Metrics();

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               System.exit( 0 );
            }
         }
      );
   }
}

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