That loop construct you have will not work. Tk will block until your sub returns. That is why there is "Tk::after - Execute a command after a time delay."

your code modified (to do somewhat what you want, some numbers may be off, but it's animated ;D)

#!/usr/bin/perl -w
use strict;
use Tk;

sub jump_it {
   my ($c, $thing) = @_;
   my ($old_x, $old_y) = $c->coords($thing);
   my $new_pos = $old_x == 10 ? 80 : 10;
   $c->coords($thing, $new_pos, $new_pos);
}

=head1 ORIGINAL C<slide_it> function

sub slide_it {
   my ($c, $thing) = @_;
   for my $i (10..80) {
      $c->coords($thing, $i, $i);
      for (my $wait=20000; --$wait;){};
   }
}

=cut

sub slide_it # canvas, card
{
    my ($c, $thing) = @_;
    $$c{__slide_for} = 80;
    $$c{__slide_count} = 0;
    $$c{__slide_timer} = $c->repeat(100, # miliseconds
                             [ \&move_thing,
                               $c,
                               $thing,
                               2, # this many pixels X
                               2, # this many pixels Y
                             ,]
                            ,);
}

sub move_thing
{
    my($c, $thing, $nX, $nY) = @_;

    if( $$c{__slide_count} > $$c{__slide_for} )
    { $$c{__slide_timer}->cancel() }

    $$c{__slide_count}++;

    $c->move( $thing, #what?
              $nX,
              $nY,                
            ,);
}

my $mw = MainWindow->new;
my $c = $mw->Canvas(-relief => 'sunken',
                    -bd     => 2,
                    -width  => 200,
                    -height => 200);
my $image = $c->Photo(-file => "cards/ah.gif");
my $card = $c->create('image', 10, 10,
                      -anchor => 'nw',
                      -image  => $image);
my $j_btn  = $mw->Button(-text    => 'Jump It',
                         -command => [\&jump_it, 
                                      $c, $card] );
my $s_btn = $mw->Button(-text    => 'Slide It',
                        -command => [\&slide_it, 
                                     $c, $card] );
$j_btn->pack;
$s_btn->pack;
$c->pack;

MainLoop;
[download]

update:Instead of :

my $image = $c->Photo(-file => "cards/ah.gif");
my $card = $c->create('image', 10, 10,
                      -anchor => 'nw',
                      -image  => $image);
[download]

you're probably better off with

my $image = $c->Photo(-file => "cards/ah.gif");
$$image{_id} = $c->create('image', 10, 10,
                      -anchor => 'nw',
                      -image  => $image);
[download]

That way when you implement a timer, you can store it in $$image{_timer} .... since you're going to have a different Photo object for each card (for the most part) ... anyway, not real important to your question (I'd probably have @cards which would hold about 52 Tk::Photo objects ....)

update: ++danger though I like my way more ;)

 

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