You set tags on the items you want to move, then setup a timer to move them. Don't use "sleep" ! Use a timer ( i.e. a repeat). P.S. You really don't need the $group, tags by themselves are just as effective.
#!/usr/bin/perl
use warnings;
use strict;
use Tk;
my $mw = MainWindow->new();
# first create a canvas widget
my $canvas = $mw->Canvas(width => 300, height => 200)->pack();
my $one = $canvas->createOval(5, 0, 20, 30, -fill => 'blue',-tags =>
+['fred']);
my $two = $canvas->createRectangle(0, 20, 50, 75, -fill => 'red',-tags
+ => ['fred']);
#my $group = $canvas->createGroup([0, 0], -members => [$one, $two]);
my $group='fred';
my $dx = 1;
my $dy = 1;
my $id = Tk::After->new($canvas,10,'repeat',
sub {$canvas->move($group, $dx,$dy);
my ($x,$y) = $canvas->bbox($group);
print "$x $y\n";
if($y >= 100){$dy = -1};
if($x >= 200){$dy = 1; $dx = -1};
if($x < -5){$dx=1;$dy=1};
});
my $ebutton = $mw->Button(-text => 'Exit',
-command => 'Tk::exit')->pack();
my $sbutton = $mw->Button(-text => 'Stop',
-command => sub{$id->cancel;})->pack();
MainLoop();
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