/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkSpatialRepresentationFilter.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkSpatialRepresentationFilter - generate polygonal model of spatial search object (i.e., a vtkLocator)
// .SECTION Description
// vtkSpatialRepresentationFilter generates an polygonal representation of a
// spatial search (vtkLocator) object. The representation varies depending
// upon the nature of the spatial search object. For example, the
// representation for vtkOBBTree is a collection of oriented bounding
// boxes. This input to this filter is a dataset of any type, and the output
// is polygonal data. You must also specify the spatial search object to
// use.
//
// Generally spatial search objects are used for collision detection and
// other geometric operations, but in this filter one or more levels of
// spatial searchers can be generated to form a geometric approximation to
// the input data. This is a form of data simplification, generally used to
// accelerate the rendering process. Or, this filter can be used as a
// debugging/ visualization aid for spatial search objects.
//
// This filter can generate one or more  vtkPolyData blocks corresponding to
// different levels in the spatial search tree. The block ids range from 0
// (root level) to MaximumLevel. Note that the block for level "id" is not computed
// unless a AddLevel(id) method is issued. Thus, if you desire three levels of output
// (say 2,4,7), you would have to invoke AddLevel(2), AddLevel(4), and
// AddLevel(7). If GenerateLeaves is set to true (off by default), all leaf nodes
// of the locator (which may be at different levels) are computed and stored in
// block with id MaximumLevel + 1.

// .SECTION See Also
// vtkLocator vtkPointLocator vtkCellLocator vtkOBBTree

#ifndef vtkSpatialRepresentationFilter_h
#define vtkSpatialRepresentationFilter_h

#include "vtkFiltersGeneralModule.h" // For export macro
#include "vtkMultiBlockDataSetAlgorithm.h"

class vtkLocator;
class vtkDataSet;
class vtkSpatialRepresentationFilterInternal;

class VTKFILTERSGENERAL_EXPORT vtkSpatialRepresentationFilter : public vtkMultiBlockDataSetAlgorithm
{
public:
  static vtkSpatialRepresentationFilter *New();
  vtkTypeMacro(vtkSpatialRepresentationFilter,vtkMultiBlockDataSetAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Set/Get the locator that will be used to generate the representation.
  virtual void SetSpatialRepresentation(vtkLocator*);
  vtkGetObjectMacro(SpatialRepresentation,vtkLocator);

  // Description:
  // Get the maximum level that is available. Populated during
  // RequestData().
  vtkGetMacro(MaximumLevel,int);

  // Description:
  // Add a level to be computed.
  void AddLevel(int level);

  // Description:
  // Remove all levels.
  void ResetLevels();

  // Description:
  // Turn on/off the generation of leaf nodes. Off by default.
  vtkSetMacro(GenerateLeaves, bool);
  vtkGetMacro(GenerateLeaves, bool);
  vtkBooleanMacro(GenerateLeaves, bool);

protected:
  vtkSpatialRepresentationFilter();
  ~vtkSpatialRepresentationFilter();

  virtual int RequestData(vtkInformation*,
                          vtkInformationVector**,
                          vtkInformationVector*);

  int MaximumLevel;
  bool GenerateLeaves;

  vtkLocator *SpatialRepresentation;

  virtual void ReportReferences(vtkGarbageCollector*);
  virtual int FillInputPortInformation(int, vtkInformation*);
private:
  vtkSpatialRepresentationFilter(const vtkSpatialRepresentationFilter&);  // Not implemented.
  void operator=(const vtkSpatialRepresentationFilter&);  // Not implemented.

  vtkSpatialRepresentationFilterInternal* Internal;
};

#endif
