void ALEState::applyActionPaddles()

in atari_py/ale_interface/src/environment/ale_state.cpp [177:273]

• 80 lines of code
• 45 McCabe index (conditional complexity)

void ALEState::applyActionPaddles(Event* event, int player_a_action, int player_b_action) {
  // Reset keys
  resetKeys(event);

  // First compute whether we should increase or decrease the paddle position
  //  (for both left and right players)
  int delta_left;
  int delta_right;

    switch(player_a_action) {
        case PLAYER_A_RIGHT: 
        case PLAYER_A_RIGHTFIRE: 
        case PLAYER_A_UPRIGHT: 
        case PLAYER_A_DOWNRIGHT: 
        case PLAYER_A_UPRIGHTFIRE: 
        case PLAYER_A_DOWNRIGHTFIRE: 
          delta_left = -PADDLE_DELTA;   
            break; 
            
        case PLAYER_A_LEFT:
        case PLAYER_A_LEFTFIRE: 
        case PLAYER_A_UPLEFT: 
        case PLAYER_A_DOWNLEFT: 
        case PLAYER_A_UPLEFTFIRE: 
        case PLAYER_A_DOWNLEFTFIRE: 
      delta_left = PADDLE_DELTA;
            break;
    default:
      delta_left = 0;
      break;
    }

    switch(player_b_action) {
        case PLAYER_B_RIGHT: 
        case PLAYER_B_RIGHTFIRE: 
        case PLAYER_B_UPRIGHT: 
        case PLAYER_B_DOWNRIGHT: 
        case PLAYER_B_UPRIGHTFIRE: 
        case PLAYER_B_DOWNRIGHTFIRE: 
          delta_right = -PADDLE_DELTA;
            break; 
            
        case PLAYER_B_LEFT:
        case PLAYER_B_LEFTFIRE: 
        case PLAYER_B_UPLEFT: 
        case PLAYER_B_DOWNLEFT: 
        case PLAYER_B_UPLEFTFIRE: 
        case PLAYER_B_DOWNLEFTFIRE: 
      delta_right = PADDLE_DELTA;
            break;
    default:
      delta_right = 0;
      break;
    }

  // Now update the paddle positions
  updatePaddlePositions(event, delta_left, delta_right);

  // Handle reset
  if (player_a_action == RESET || player_b_action == RESET) 
    event->set(Event::ConsoleReset, 1);

  // Now add the fire event 
  switch (player_a_action) {
        case PLAYER_A_FIRE: 
        case PLAYER_A_UPFIRE: 
        case PLAYER_A_RIGHTFIRE: 
        case PLAYER_A_LEFTFIRE: 
        case PLAYER_A_DOWNFIRE: 
        case PLAYER_A_UPRIGHTFIRE: 
        case PLAYER_A_UPLEFTFIRE: 
        case PLAYER_A_DOWNRIGHTFIRE: 
        case PLAYER_A_DOWNLEFTFIRE: 
            event->set(Event::PaddleZeroFire, 1);
            break;
    default:
      // Nothing
      break;
  }
  
  switch (player_b_action) {
        case PLAYER_B_FIRE: 
        case PLAYER_B_UPFIRE: 
        case PLAYER_B_RIGHTFIRE: 
        case PLAYER_B_LEFTFIRE: 
        case PLAYER_B_DOWNFIRE: 
        case PLAYER_B_UPRIGHTFIRE: 
        case PLAYER_B_UPLEFTFIRE: 
        case PLAYER_B_DOWNRIGHTFIRE: 
        case PLAYER_B_DOWNLEFTFIRE: 
            event->set(Event::PaddleOneFire, 1);
            break;
    default:
      // Nothing
      break;
  }
}