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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_frame(@images);
$img->start_animation;
$img->start_animation( $period );
$img->next_image;
$img->prev_image;
$img->set_image( 0 .. $#frames );
$img->pause_animation;
$img->resume_animation( $period );
$img->fast_forward( $multiplier );
$img->fast_reverse( $multiplier );
$img->stop_animation;
$img->set_disposal_method( $boolean );
=head1 DESCRIPTION
In the simple case when C<Animation> is passed a GIF89 style GIF with
multiple 'frames', it will build an internal array of C<Photo> images.
The C<add_frame> method adds images to the sequence. It is provided
to allow animations to be constructed from separate images.
All images must be C<Photo>s and should all be the same size.
C<start_animation($period)> then initiates a C<repeat> with specified
I<$period> to sequence through these images. As for raw C<repeat>
I<$period> is in milliseconds, for a 50Hz monitor it should be at
least 20ms. If I<$period> is omitted it is determined from the GIF
metadata (see below), or if this is not possible it defaults to 100
milliseconds.
C<stop_animation> cancels the C<repeat> and resets the image to the first
image in the sequence.
For fine-grained control C<next_image> and C<prev_image> move one frame forward
or backward. C<set_image> randomly positions the animation to a particular frame.
C<pause_animation> pauses the movie and C<resume_animation> continues from the
pause point.
C<fast_forward> and C<fast_reverse> speed through the movie either
forwards or backwards. $multiplier specifies how much faster the
animation moves.
If L<Image::Info> is installed, then the repeat period time and
disposal method of GIF animations are determined from the GIF metadata
directly. Otherwise the disposal method must be set manually by using
C<set_disposal_method> (1 for blanking the previous images, 0 for
leaving the previous images as is). The repeat period time may be
given in the C<start_animation> method.
=head1 NOTES
C<set_disposal_method> was formerly known as C<blank> method, but the
naming of this method was a mistake.
If the disposal method is not set correctly, either by
C<set_disposal_method> or by determining from the GIF metadata, then
the following may happen: By default Animation leaves the previous
movie frame in the animation photo. Many times overlaying subsequent
frames produces a composite that looks blurred.
=head1 BUGS
This module should not depend on a module which is not declared as a
dependency (Image::Info).
The delays between images may vary in a GIF animation. This cannot be
handled by this module yet.
The handling of the various disposal methods is not correct.
=cut
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