=pod
=head1 NAME
SDLx::Controller::Interface - Interface Physics and Rendering with the Controller with callbacks
=head1 CATEGORY
Extension, Controller
=head1 SYNOPSIS
use SDL;
use SDLx::App;
use SDLx::Controller::Interface;
#SDLx::App is a controller
my $app = SDLx::App->new(width => 200, height => 200 );
my $ball = SDLx::Controller::Interface->new( x=> 10, y => 50, v_x => 10, v_y=> 20 );
#Set the initial state of the ball's physics, this is optional
$ball->set_acceleration(
sub {
my ($time, $current_state) = @_;
return( 0, -10, 0 ); # Return accelerations (x,y,rotation)
}
);
my $ball_render = sub {
my $state = shift;
$app->draw_rect( undef, 0 );
$app->draw_rect( [$state->x, $state->y, 10,10], [255,0,0,255] );
$app->update();
};
$ball->attach( $app, $ball_render, @params );
$app->run();
$ball->detach(); #can be called at anytime (for example when ball 'dies')
=head1 DESCRIPTION
=head1 METHODS
=head2 set_acceleration
Allows you to set the acceleration callback for defining the interface's
behaviour in terms of x,y and rotation.
$interface->set_acceleration (
sub {
my ($time, $current_state) = @_;
return ( $accel_x, $accel_y, $torque );
}
);
These accelerations are arbitrary and can be set to any frame of reference.
Your render callback will handle how to interpret it.
The callback will receive the time and the current state as a
C<SDLx::Controller::State> element.
=head2 attach
Attaches the interface to a controller with a render callback
$interface->attach( $controller, $render, @params );
Where $render is a callback that receives the interpolated
C<SDLx::Controller::State>.
my $render = sub {
my ($state, @params) = @_;
# draw the current $state.
};
The @params are any extra parameters you would like to pass to the $render
callback.
=head2 current
my $current_state = $interface->current();
Returns the current state of the interface as a C<SDLx::Controller::State>.
=head2 previous
my $previous_state = $interface->previous();
Returns the previous state of the interface as a C<SDLx::Controller::State>.
=head2 detach
$interface->detach();
If $interface has been C<attach()>'ed to any controller it will be detached now.
=head1 OTHER METHODS
Don't use these unless you really really want to.
=head2 acceleration
Call the acceleration callback once.
=head2 interpolate
Interpolate the current state
=head2 evaluate
Evaluate the new current and previous state.
=head2 update
Update the states by integrating with time.
=head1 AUTHORS
See L<SDL/AUTHORS>.
=cut