Re: Unicode labels, fonts for components?

Wayne <nospam@all4me.invalid>
Wed, 23 Jan 2008 05:29:29 -0500
Roedy Green wrote:

On Mon, 21 Jan 2008 21:09:45 -0800, "Peter Duniho"
<> wrote, quoted or indirectly quoted
someone who said :

But: your page also says that I can only use the five Java logical fonts
with an AWT control. This conflicts with your statement above, "You can
do a setFont for any font installed". Can I actually do that? Or am I,
as the web page says, restricted to the five Java fonts?


I explain all this at

the rules are different for
AWT components
AWT drawString

Then there is the matter of whether you can have anti-aliasing.

Most people use Swing nowadays where you have the most flexibility
with Fonts.


I have some updates for your font page:

I used the following on a Linux Fedora 8 system today:

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

public class FontLister {
     public static void main ( String [] args ) {
         Frame frame = new Frame( "AWT Font Lister" );
         frame.setSize( 800, 900 );
         frame.addWindowListener( new WindowAdapter() {
             public void windowClosing( WindowEvent we ) {
                 System.exit( 0 );
         Font[] fonts = GraphicsEnvironment.getLocalGraphicsEnvironment()
                   .getAllFonts(); // A list of all Fonts, at 1 pt PLAIN.
         int length = fonts.length;
         if ( length > 82 ) length = 82; // Limit on Fedora 8 ???
         Panel p = new Panel();
         p.setLayout( new GridLayout(length, 0) );

         for ( int i = 0; i < length; ++i ) {
             String s = fonts[i].getFontName() + " - "
                 + fonts[i].getFamily() + " (" + fonts[i].getName() + ")";
             Label l = new Label( s );
             l.setFont( fonts[i].deriveFont( 12.0f ) );
             p.add( l );
         ScrollPane sp = new ScrollPane();
         sp.add( p );
         frame.add( sp );
         frame.setVisible( true );

As you can see this is pure AWT. Each Component (Label) is
drawn using a different Font. All my fonts (~195) are found,
but for some reason if I add more than 82 to the Panel, the
"frame.setVisible( true );" statement throws an
ArrayIndexOutOfBoundsException. (Using Sun JDK 1.6.)

But the 82 fonts display fine!

So it seems the AWT limit for logical fonts applies only to
Windows (I tested only on Windows XP).

Also it seems my TrueType fonts work on Fedora 8 as well.
I have to check into that more carefully before I'm
certain which font file formats work.

"You can simply the cache, sacrifice a small reptile and reboot."
I think you meant "...simply delete the cache, ...".
"If you want to include custom fonts in your application, you either
have to get the customer to install them or uses this trick to use
them directly from a jar."

"uses" should be "use".
canDisplay() doesn't actually "lie". I believe it is implemented by
checking to see if a code point is within the range covered by
that font. The problem is fonts are not required to provide
glyphs for each code point in the range they claim to cover.

I'd like to see you start a JSR for updating the specs to include
minimal font, graphic, and system standard sounds (and encodings).
The platform-dependencies and lack of methods to work around these
limitations is very annoying and confusing.


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