Added more docs for interface

lib/pods/SDLx/Controller/Interface.pod

@@ -49,22 +49,68 @@ Core, Extension
 
 =head2 set_acceleration
 
+Allows you to set the acceleration callback for defining the inferface's behaviour in terms of x,y and rotation.
+
+  $interface->set_acceleration ( 
+      sub {
+         my ($time, $current_state) = @_; 
+
+         return ( $acc_x, $acc_y, $torque );
+      }
+  );
+
+These accelerations are arbitary and can be set to any frame of reference. Your render callback will handle how to 
+interpert it. 
+
+The callback will recieve the time and the current state as a C<SDLx::Controller::State>.
+
 =head2 attach
 
+Attaches the interface to a controller with a render callback
+
+  $interface->attach( $controller, $render, @params );
+
+Where $render is a callback that recieves the interpolated C<SDLx::Controller::State>. 
+
+  my $render = sub {
+                       my ($state) = shift; my @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>.
+
 =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 currrent and previous state.
+
 =head2 update
 
+Update the states by integrating with time.
+
 =head1 AUTHORS
 
 See L<SDL/AUTHORS>.