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

  Program:   Visualization Toolkit
  Module:    vtkDicer.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
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=========================================================================*/
// .NAME vtkDicer - abstract superclass to divide dataset into pieces
// .SECTION Description
// Subclasses of vtkDicer divides the input dataset into separate
// pieces.  These pieces can then be operated on by other filters
// (e.g., vtkThreshold). One application is to break very large
// polygonal models into pieces and performing viewing and occlusion
// culling on the pieces. Multiple pieces can also be streamed through
// the visualization pipeline.
//
// To use this filter, you must specify the execution mode of the
// filter; i.e., set the way that the piece size is controlled (do
// this by setting the DiceMode ivar). The filter does not change the
// geometry or topology of the input dataset, rather it generates
// integer numbers that indicate which piece a particular point
// belongs to (i.e., it modifies the point and cell attribute
// data). The integer number can be placed into the output scalar
// data, or the output field data.

// .SECTION Caveats
// The number of pieces generated may not equal the specified number
// of pieces. Use the method GetNumberOfActualPieces() after filter
// execution to get the actual number of pieces generated.

// .SECTION See Also
// vtkOBBDicer vtkConnectedDicer vtkSpatialDicer

#ifndef __vtkDicer_h
#define __vtkDicer_h

#include "vtkDataSetToDataSetFilter.h"

#define VTK_DICE_MODE_NUMBER_OF_POINTS 0
#define VTK_DICE_MODE_SPECIFIED_NUMBER 1
#define VTK_DICE_MODE_MEMORY_LIMIT 2

class VTK_EXPORT vtkDicer : public vtkDataSetToDataSetFilter 
{
public:
  vtkTypeMacro(vtkDicer,vtkDataSetToDataSetFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Set/Get the flag which controls whether to generate point scalar
  // data or point field data. If this flag is off, scalar data is
  // generated.  Otherwise, field data is generated. Note that the
  // generated the data are integer numbers indicating which piece a
  // particular point belongs to.
  vtkSetMacro(FieldData,int);
  vtkGetMacro(FieldData,int);
  vtkBooleanMacro(FieldData,int);

  // Description:
  // Specify the method to determine how many pieces the data should be
  // broken into. By default, the number of points per piece is used.
  vtkSetClampMacro(DiceMode,int,VTK_DICE_MODE_NUMBER_OF_POINTS,VTK_DICE_MODE_MEMORY_LIMIT);
  vtkGetMacro(DiceMode,int);
  void SetDiceModeToNumberOfPointsPerPiece()
    {this->SetDiceMode(VTK_DICE_MODE_NUMBER_OF_POINTS);};
  void SetDiceModeToSpecifiedNumberOfPieces()
    {this->SetDiceMode(VTK_DICE_MODE_SPECIFIED_NUMBER);};
  void SetDiceModeToMemoryLimitPerPiece()
    {this->SetDiceMode(VTK_DICE_MODE_MEMORY_LIMIT);};

  // Description:
  // Use the following method after the filter has updated to
  // determine the actual number of pieces the data was separated
  // into.
  vtkGetMacro(NumberOfActualPieces,int);

  // Description:
  // Control piece size based on the maximum number of points per piece.
  // (This ivar has effect only when the DiceMode is set to 
  // SetDiceModeToNumberOfPoints().)
  vtkSetClampMacro(NumberOfPointsPerPiece,int,1000,VTK_LARGE_INTEGER);
  vtkGetMacro(NumberOfPointsPerPiece,int);

  // Description:
  // Set/Get the number of pieces the object is to be separated into.
  // (This ivar has effect only when the DiceMode is set to
  // SetDiceModeToSpecifiedNumber()). Note that the ivar
  // NumberOfPieces is a target - depending on the particulars of the
  // data, more or less number of pieces than the target value may be
  // created.
  vtkSetClampMacro(NumberOfPieces,int,1,VTK_LARGE_INTEGER);
  vtkGetMacro(NumberOfPieces,int);

  // Description:
  // Control piece size based on a memory limit.  (This ivar has
  // effect only when the DiceMode is set to
  // SetDiceModeToMemoryLimit()). The memory limit should be set in
  // kilobytes.
  vtkSetClampMacro(MemoryLimit,unsigned long,100,VTK_LARGE_INTEGER);
  vtkGetMacro(MemoryLimit,unsigned long);

protected:
  vtkDicer();
  ~vtkDicer() {};
  vtkDicer(const vtkDicer&) {};
  void operator=(const vtkDicer&) {};

  virtual void UpdatePieceMeasures();

  int           NumberOfPointsPerPiece;
  int           NumberOfPieces;
  unsigned long MemoryLimit;
  int           NumberOfActualPieces;
  int           FieldData;
  int           DiceMode;

};

#endif


