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

  Program:   Visualization Toolkit
  Module:    vtkTemporalInterpolator.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.

=========================================================================*/
#ifndef vtkTemporalInterpolator_h
#define vtkTemporalInterpolator_h

#include "vtkFiltersHybridModule.h" // For export macro
#include "vtkMultiTimeStepAlgorithm.h"

class vtkDataSet;
class VTKFILTERSHYBRID_EXPORT vtkTemporalInterpolator : public vtkMultiTimeStepAlgorithm
{
public:
  static vtkTemporalInterpolator *New();
  vtkTypeMacro(vtkTemporalInterpolator, vtkMultiTimeStepAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkSetMacro(DiscreteTimeStepInterval, double);
  vtkGetMacro(DiscreteTimeStepInterval, double);


  vtkSetMacro(ResampleFactor, int);
  vtkGetMacro(ResampleFactor, int);


  vtkSetMacro(CacheData, bool);
  vtkGetMacro(CacheData, bool);

protected:
  vtkTemporalInterpolator();
  ~vtkTemporalInterpolator();


  double DiscreteTimeStepInterval;
  int    ResampleFactor;

  virtual int FillInputPortInformation(int port, vtkInformation* info);
  virtual int FillOutputPortInformation(int vtkNotUsed(port), vtkInformation* info);


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

  virtual int RequestUpdateExtent(vtkInformation *,
                                  vtkInformationVector **,
                                  vtkInformationVector *);
  virtual int RequestInformation(vtkInformation *,
                                 vtkInformationVector **,
                                 vtkInformationVector *);

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


  vtkDataObject *InterpolateDataObject(vtkDataObject *in1,
                                       vtkDataObject *in2,
                                       double ratio);


  virtual vtkDataSet *InterpolateDataSet(vtkDataSet *in1,
                                         vtkDataSet *in2,
                                         double ratio);


  virtual vtkDataArray *InterpolateDataArray(double ratio,
                                             vtkDataArray **arrays,
                                             vtkIdType N);

  virtual bool VerifyArrays(vtkDataArray **arrays, int N);

  // internally used : Ratio is {0,1} between two time steps
  // DeltaT is time between current 2 steps.
  // These are only valid when 2 time steps are interpolated
  // Higher order schemes will require changes to the API
  double Ratio;
  double DeltaT;
  double Tfrac;

private:
  vtkTemporalInterpolator(const vtkTemporalInterpolator&);  // Not implemented.
  void operator=(const vtkTemporalInterpolator&);  // Not implemented.
};



#endif