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/*
 *
 * This file is part of Tulip (www.tulip-software.org)
 *
 * Authors: David Auber and the Tulip development Team
 * from LaBRI, University of Bordeaux
 *
 * Tulip is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * Tulip 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.
 *
 */
///@cond DOXYGEN_HIDDEN

#ifndef Tulip_QLQUADTREELODCALCULATOR_H
#define Tulip_QLQUADTREELODCALCULATOR_H

#include <map>
#include <vector>

#include <tulip/GlCPULODCalculator.h>
#include <tulip/Observable.h>
#include <tulip/GlGraphRenderingParameters.h>

namespace tlp {

class Camera;
template <class TYPE> class QuadTreeNode;
class GlScene;
class PropertyInterface;
class Graph;
class GlLayer;

/**
 * Class use to compute bounding boxs of a vector of GlEntity
 */
class TLP_GL_SCOPE GlQuadTreeLODCalculator : public GlCPULODCalculator, private Observable {

public:

  GlQuadTreeLODCalculator();
  ~GlQuadTreeLODCalculator();

  /**
   * Set the SlScene used by this calculator
   */
  void setScene(GlScene &scene);

  /**
   * To know if the calculator need to have entities returned by a visitor in GlScene
   */
  bool needEntities();
  /**
   * Set if the calculator need to have entities
   */
  void setNeedEntities(bool);

  /**
   * This function is call by GlLODSceneVisitor when a simple entitie is found
   */
  void addSimpleEntityBoundingBox(GlSimpleEntity * entity,const BoundingBox& bb);
  /**
   * This function is call by GlLODSceneVisitor when a node is found
   */
  void addNodeBoundingBox(unsigned int id,const BoundingBox& bb);
  /**
   * This function is call by GlLODSceneVisitor when an edge is found
   */
  void addEdgeBoundingBox(unsigned int id,const BoundingBox& bb);

  /**
   * This function compute LOD
   * See compute function of GlCPULODCalculator for more details
   * This function do some computation and after call computeFor2DCamera() or computeFor3DCamera()
   */
  void compute(const Vector<int,4>& globalViewport,const Vector<int,4>& currentViewport);

  /**
   * Specific function to compute LOD for 3D cameras
   */
  void computeFor3DCamera(LayerLODUnit *layerLODUnit,const Coord &eye,
                          const Matrix<float, 4>& transformMatrix,
                          const Vector<int,4>& globalViewport,
                          const Vector<int,4>& currentViewport);

  /**
   * Change the input data used by this LOD calculator
   */
  void setInputData(const GlGraphInputData *newInputData);

  /**
   * Clone the calculator
   */
  virtual GlLODCalculator *clone() {
    GlQuadTreeLODCalculator *newCalculator=new GlQuadTreeLODCalculator();
    newCalculator->setScene(*glScene);
    newCalculator->setInputData(inputData);
    return newCalculator;
  }

protected :

  void update(PropertyInterface *property);
  void treatEvent(const Event &ev);

  void removeObservers();
  void addObservers();

  void initCamerasObservers();
  void clearCamerasObservers();

  void setHaveToCompute();

  std::vector<QuadTreeNode<unsigned int> *> nodesQuadTree;
  std::vector<QuadTreeNode<unsigned int> *> edgesQuadTree;
  std::vector<QuadTreeNode<GlSimpleEntity *> *> entitiesQuadTree;
  std::vector<std::vector<SimpleEntityLODUnit> > simpleEntities;

  bool haveToCompute;
  bool haveToInitObservers;

  BoundingBox nodesGlobalBoundingBox;
  BoundingBox edgesGlobalBoundingBox;
  BoundingBox entitiesGlobalBoundingBox;

  std::vector<Camera *> cameras;
  std::map<GlLayer*, Camera> layerToCamera;
  Camera *currentCamera;
  Graph *currentGraph;
  PropertyInterface *layoutProperty;
  PropertyInterface *sizeProperty;
  PropertyInterface *selectionProperty;
  GlGraphRenderingParameters oldParameters;

  int quadTreesVectorPosition;
  int simpleEntitiesVectorPosition;
};

}

#endif // Tulip_QTQUADTREELODCALCULATOR_H
///@endcond