//
//  Filename         : Node.h
//  Author(s)        : Stephane Grabli
//  Purpose          : Abstract class for scene graph nodes. Inherits from 
//                     BaseObject which defines the addRef release mechanism.
//  Date of creation : 24/01/2002
//
///////////////////////////////////////////////////////////////////////////////


//
//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
//   with this source distribution. 
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////

#ifndef  NODE_H
# define NODE_H

# include "../system/FreestyleConfig.h"
# include "../system/BaseObject.h"
# include "SceneVisitor.h"
# include "../geometry/BBox.h"
# include "../geometry/Geom.h"
# include "../system/Precision.h"

using namespace std;
using namespace Geometry;

class LIB_SCENE_GRAPH_EXPORT Node : public BaseObject
{
public:

  inline Node() : BaseObject() {}
  inline Node(const Node& iBrother) : BaseObject()
  {
    _BBox = iBrother.bbox();
  }
  virtual ~Node(){}

  /*! Accept the corresponding visitor
   * Each inherited node 
   * must overload this method
   */
  virtual void accept(SceneVisitor& v) {
    v.visitNode(*this);
  }

  /*! bounding box management */
  /*! Returns the node bounding box 
   *  If no bounding box exists, an empty bbox
   *  is returned
   */
  virtual const BBox<Vec3r>& bbox() const {return _BBox;}

  /*! Sets the Node bounding box */
  virtual void setBBox(const BBox<Vec3r>& iBox) {_BBox = iBox;}

  /*! Makes the union of _BBox and iBox */
  virtual void AddBBox(const BBox<Vec3r>& iBox) 
  {
    if(iBox.empty())
      return;

    if(_BBox.empty())
      _BBox = iBox;
    else
      _BBox += iBox;
  }

  /*! Updates the BBox */
  virtual const BBox<Vec3r>& UpdateBBox() {return _BBox;}

  /*! Clears the bounding box */
  virtual void clearBBox() { _BBox.clear(); }
  
protected:
  
private: 
  BBox<Vec3r> _BBox;
};

#endif // NODE_H