update: Just in case you get the wrong impression, I am not "Walter C. Mankowski".
A time display's nice, but an analog clock is nicer(screenshot).

#!/usr/bin/perl
# $Log: tk_internet_time,v $
# Revision 1.2  1999/06/27 03:46:49  waltman
# Added copyright notice
# Added some comments
# Removed fonts (just use whatever the default is)
# Improved visual appearance of clock
# Cleaned out some test code
# Removed "@" from the sprintf in itime()
#
# Revision 1.1  1999/06/27 03:34:19  waltman
# Initial revision
#
# Copyright 1999 Walter C. Mankowski
# You may copy and distribute this program under the
# same terms as Perl iteself.  

use Tk;

my $mw = MainWindow->new;
$mw->title("Internet Time");

# $canvas is where the analog clock goes
my $canvas = $mw->Canvas(-height => 210,
             -width  => 210)->pack(-side => 'top',
                           -expand => 1);

# $label is where the digital clock goes
my $label = $mw->Label(-text => '@' . substr(&itime,0,3),
               )->pack(-side => 'top',
                   -expand => 1);
# periodically update the digital clock
$label->repeat( 1000,
        sub{$label->configure(-text => '@' . substr(&itime,0,3))} );

# Draw the analog clock
$canvas->createOval(5, 5, 205, 205, -width => 5);          # the outer
+ circle

$canvas->createOval(100,100, 110, 110, -fill => "black");  # where the
+ hands
                                                           # meet

&DrawTicks;                                                # ticks aro
+und the
                                                           # outside

&DrawHands ($canvas, &itime,1);                            # hands

# periodically move the hands
$canvas->repeat( 500, \&RedrawHands, $canvas);

&MainLoop;

sub itime {
     my $s = sprintf "%07.3f", ((time+3600) % 86400)/86.4;

     return $s;
}

sub DrawHands {
     my ($canvas, $t) = @_;

     $hand1 = &DrawHand ($canvas, $t / 1000, 50, 10);
     $hand2 = &DrawHand ($canvas, substr($t,1) / 100, 75, 8);
     $hand3 = &DrawHand ($canvas, substr($t,2) / 10, 100, 6);
     $hand4 = &DrawHand ($canvas, substr($t,4) / 1000, 100, 2);
}

sub DrawHand {
     my ($canvas, $frac, $length, $line_width) = @_;
     my $pi = 3.14159;
     my $height;
     my $width;
     my $theta;
     my $hand;

     $theta = ($frac * 2 * $pi) - ($pi / 2);
     $height = $length * sin($theta);
     $width = $length * cos($theta);

     $hand = $canvas->createLine(105, 105, 105+$width, 105+$height,
                 -arrow => "last",
                 -width => $line_width);
}

sub RedrawHands {
     my $canvas = shift;
     $canvas->delete ($hand1, $hand2, $hand3, $hand4);

     &DrawHands ($canvas, &itime,1);
}

sub DrawTicks {
     my $pi = 3.14159;
     my $i;
     my ($h1, $w1, $h2, $w2);
     my $theta;
     my ($l1, $l2) = (85, 100);

     foreach $i (1..100) {
      if ($i % 10 == 0) {
           $l1 = 80;
      } elsif ($i % 5 == 0) {
           $l1 = 90;
      } else {
           $l1 = 95;
      }
      $theta = ($i/100 * 2 * $pi) - ($pi / 2);

      $h1 = $l1 * sin($theta) + 105;
      $w1 = $l1 * cos($theta) + 105;
      $h2 = $l2 * sin($theta) + 105;
      $w2 = $l2 * cos($theta) + 105;

      $canvas->createLine($w1, $h1, $w2, $h2);
     }
}
[download]

 
___crazyinsomniac_______________________________________
Disclaimer: Don't blame. It came from inside the void
perl -e "$q=$_;map({chr unpack qq;H*;,$_}split(q;;,q*H*));print;$q/$q;"

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