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=head1 NAME
Tk::Animation - Display sequence of Tk::Photo images
=for pm Tk/Animation.pm
=for category Tk Image Classes
=head1 SYNOPSIS
use Tk::Animation
my $img = $widget->Animation('-format' => 'gif', -file => 'somefile.gif');
$img->add_frames(@images);
$img->start_animation($period);
$img->stop_animation;
=head1 DESCRIPTION
In the simple case when C<Animation> is passed a GIF89 style GIF with
multiple 'frames', it will build an internal array of C<Photo> images.
The C<add_frames> method adds images to the sequence. It is provided
to allow animations to be constructed from separate images.
All images must be C<Photo>s and should all be the same size.
C<start_animation($period)> then initiates a C<repeat> with specified I<$period>
to sequence through these images. As for raw C<repeat> I<$period> is in milli-seconds,
for a 50Hz monitor it should be at least 20mS.
C<stop_animation> cancels the C<repeat> and resets the image to the first
image in the sequence.
=head1 BUGS
The 'period' should probably be a property of the Animation object
rather than specified at 'start' time. It may even be embedded
in the GIF.
=cut
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