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ksokoban'MoveSequence (./kdegames/ksokoban/MoveSequence.H:28)

class MoveSequence {
public:
  MoveSequence (Move *_move, LevelMap *_map, bool _undo=false);

  bool newStep ();
  bool next ();

private:
  LevelMap *map_;
  Move     *move_;
  int       pos_;
  int       x_, xDest_, y_, yDest_, xd_, yd_;
  bool      push_;
  bool      undo_;

};

ksokoban'MoveSequence::MoveSequence() (./kdegames/ksokoban/MoveSequence.C:24)

MoveSequence::MoveSequence (Move *_move, LevelMap *_map, bool _undo) {
  assert (_move->finished_);

  move_ = _move;
  map_ = _map;
  undo_ = _undo;

  if (undo_) {
    pos_ = move_->moveIndex_-2;

    xDest_ = x_ = move_->moves_[move_->moveIndex_-1]&0x7f;
    yDest_ = y_ = (move_->moves_[move_->moveIndex_-1]>>8)&0x7f;
  } else {
    pos_ = 1;

    xDest_ = x_ = move_->moves_[0]&0x7f;
    yDest_ = y_ = (move_->moves_[0]>>8)&0x7f;
  }

  newStep ();
}

bool

ksokoban'MoveSequence::newStep() (./kdegames/ksokoban/MoveSequence.C:47)

MoveSequence::newStep () {
  if (pos_>=move_->moveIndex_ || pos_<0) return false;

  xDest_ = move_->moves_[pos_]&0x7f;
  yDest_ = (move_->moves_[pos_]>>8)&0x7f;
  if (undo_) push_ = (move_->moves_[pos_+1]&0x80)==0x80;
  else       push_ = (move_->moves_[pos_]&0x80)==0x80;

  xd_ = yd_ = 0;
  if (xDest_ < x_) xd_ = -1;
  if (xDest_ > x_) xd_ =  1;
  if (yDest_ < y_) yd_ = -1;
  if (yDest_ > y_) yd_ =  1;

  if (undo_) pos_--;
  else       pos_++;

  return true;
}

bool

ksokoban'MoveSequence::next() (./kdegames/ksokoban/MoveSequence.C:68)

MoveSequence::next () {
  if (x_ == xDest_ && y_ == yDest_ && !newStep ()) return false;

  x_ += xd_;
  y_ += yd_;

  if (undo_) {
    if (push_) return map_->unpush (x_, y_);
    else return map_->unstep (x_, y_);
  } else {
    if (push_) return map_->push (x_, y_);
    else return map_->step (x_, y_);
  }
}