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FadeInOut.pm
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FadeInOut.pm
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package SDLx::SlideShow::FadeInOut ;
use 5.10.1;
use Carp ;
use SDL;
use SDLx::Sprite;
use SDLx::Surface;
use SDL::Color ;
use Any::Moose;
use Any::Moose '::Util::TypeConstraints' ;
extends 'SDLx::SlideShow::Any' ;
subtype 'My::Types::SDLx::Sprite' => as class_type('SDLx::Sprite');
class_type('SDLx::Surface');
coerce 'My::Types::SDLx::Sprite'
=> from 'SDLx::Surface'
=> via {
say "coercing surf";
my $s = SDLx::Sprite->new ( width => $_->w, height=>$_->h, alpha => 0xff, ) ;
$_->blit($s->surface) ;
return $s ;
} ;
# holds old image
has _bg_frame => (
is => 'ro',
isa => 'SDLx::Sprite',
lazy => 1,
builder => '_build_bg_frame',
);
sub _build_bg_frame {
my $self = shift ;
my $s = SDLx::Surface->new( width => $self->width, height => $self->height);
$self->image->draw($s) ;
my $spr = SDLx::Sprite->new (
surface => $s,
alpha => 0xff,
) ;
return $spr ;
}
has image => (
is => 'rw',
isa => 'My::Types::SDLx::Sprite',
handles => { qw/width w height h/ } ,
required => 1,
coerce => 1,
trigger => \&_new_image ,
);
sub _new_image {
my $self = shift ;
my ($image,$old) = @_;
return unless @_ > 1 ;
$self->SUPER::_new_image(@_) ;
say "fadeinout blit old image";
$old->alpha(0xff) ;
$old->draw($self->_bg_frame->surface);
}
sub tick {
my $self = shift;
if ( $self->busy ) {
my $alpha = $self->progress( 0xFF ) ;
say "alpha $alpha, other ", 0xff - $alpha ;
my $transition = $self->surface; #SDLx::Surface->new( width=> $self->width, height=> $self->height) ;
$self->image->alpha($alpha) ;
$self->_bg_frame->alpha(0xff - $alpha) ;
# draw fading image on frame
$self->_bg_frame->surface->blit( $transition);
$self->image ->surface->blit( $transition);
$transition->update ;
$self->inc_step;
return $transition ;
}
else {
return $self->image->surface ;
}
}
__PACKAGE__->meta->make_immutable();
1;