[.. upper level ..]

Collision-detection: Structures and enumerations

• Enumerations
• VGAG3_COLL_RETURNS
  Return value of the function VG3_move_object_check_collision()

  VGAG3_COLL_RETURN_NOOP	No collision
  VGAG3_COLL_RETURN_HIT	Object-instance hits another object-instance
  VGAG3_COLL_RETURN_DEAD	Object-instance hits another object-instance and is being freed
  VGAG3_COLL_RETURN_HALFSTOP	Object-instance is being stopped at one direction
  VGAG3_COLL_RETURN_FULLSTOP	Object-instance is being totally stopped
  VGAG3_COLL_RETURN_CATCHED	Object-instance is catched in collision
  VGAG3_COLL_RETURN_CONTINUE	Object-instance may go on and check next obstacle

• VGAG3_COLLSIDES
  At which side(s) at the destination object the collision has been occurred.

  VGAG3_COLLSIDE_RIGHT	At the right side
  VGAG3_COLLSIDE_LEFT	At the left side
  VGAG3_COLLSIDE_TOP	At the top
  VGAG3_COLLSIDE_BOTTOM	At the bottom



• Structures
• struct vg3_coll
  Collision structure.
  

  struct vg3_rect rect	Collision rectangle of object-instance
  char oid[VGAG3_OID_SIZE]	Individual object-ID (or empty if unused)
  void *optr	Pointer to object-instance (e.g. of struct vg3_ofunc_object *)
  struct vg3_coll_ret ret	For returning collision infos

• struct vg3_coll_ret
  Collision-return structure.
  

  int side	At which side(s) at the destination object the collision has been occurred (VGAG3_COLLSIDES)
  int maxsteps	Number of total steps to be done
  int steps	Number of steps taken to the position with collision
  struct vg3_rect pos_nocoll	Last position without collision (or equal to pos_coll)
  struct vg3_rect pos_coll	First position with collision
  int tag	Tag of the quadtree

• struct vg3_quadtree
  Structure for quadtree, only internally used.