The Collectible class

The collectibles for this game will be represented by the Collectible class that inherits from GameObject and will be used to represent all three types of collectibles: the simple collectible, the rocket, and the balloon. It will possess a score value and a flag that marks whether it has been collected. It will possess functions to manage life events that we will discuss in this section, starting with the SetBody function:

void Collectible::SetBody(b2Body* body)
{
  b2PolygonShape collectible_shape;

  // create different box shapes for different collectibles
  switch(type_)
  {
  case E_GAME_OBJECT_COLLECTIBLE:
    collectible_shape.SetAsBox(SCREEN_TO_WORLD(
      m_obContentSize.width/2), SCREEN_TO_WORLD(
      m_obContentSize.height/2));
    break;
  case E_GAME_OBJECT_ROCKET:
  case E_GAME_OBJECT_BALLOON:
    collectible_shape.SetAsBox(SCREEN_TO_WORLD(
      m_obContentSize.width/2), SCREEN_TO_WORLD(
      m_obContentSize.height/4), b2Vec2(0, SCREEN_TO_WORLD(
  ...