pods::SDLx::Controller::Interface(3)

NAME
SDLx::Controller::Interface - Interface Physics and Rendering with the Controller with callbacks

CATEGORY
Extension, Controller

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')

DESCRIPTION

METHODS

  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 "SDLx::Controller::State" element.

  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 "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.

  current
  my $current_state = $interface->current();

Returns the current state of the interface as a "SDLx::Controller::State".

  previous
  my $previous_state = $interface->previous();

Returns the previous state of the interface as a "SDLx::Controller::State".

  detach
  $interface->detach();

If $interface has been "attach()"'ed to any controller it will be detached now.

OTHER METHODS
Don't use these unless you really really want to.

  acceleration
Call the acceleration callback once.

  interpolate
Interpolate the current state

  evaluate
Evaluate the new current and previous state.

  update
Update the states by integrating with time.

AUTHORS
See "AUTHORS" in SDL.