use strict;
use warnings;

use Tk;
use Tk::Text;
use Tk::Font;

use Data::Dumper;

# Create pTk text window...
my $mw = MainWindow->new(-title => 'Text Font');
my $txt = $mw->Scrolled('Text')->pack(-fill => 'x', -side => 'left');

# Get Current font...
my $currfont = $txt->cget(-font);

# Create new font by cloning & modifying current font...
my $boldfont= $currfont->Clone(-weight=>'bold');

# configure new tag ('bold') causing tagged characters to use the new bold font...
$txt->tagConfigure('bold', -font => $boldfont);

# Insert some text that is not tagged as bold...
$txt->insert('end', "========================\n");
$txt->insert('end', "Default font requested:\n" . Dumper($currfont));
$txt->insert('end', "\nDefault font chosen:\n" . Dumper($currfont->actual));

# Insert some text that is tagged as bold...
$txt->insert('end', "========================\n");
$txt->insert('end', "Bold font requested:\n" . Dumper($boldfont), ['bold']);
$txt->insert('end', "\nBold font chosen:\n" . Dumper($boldfont->actual), ['bold']);

MainLoop;