dox/Parallel/vtkTemporalInterpolatedVelocityField.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkTemporalInterpolatedVelocityField.h,v $

  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 __vtkTemporalInterpolatedVelocityField_h
#define __vtkTemporalInterpolatedVelocityField_h

#include "vtkFunctionSet.h"

#define ID_INSIDE_ALL  00
#define ID_OUTSIDE_ALL 01
#define ID_OUTSIDE_T1  02
#define ID_OUTSIDE_T2  03

class vtkDataSet;
class vtkDataArray;
class vtkPointData;
class vtkGenericCell;
class vtkDoubleArray;
class vtkInterpolatedVelocityField;
class vtkTInterpolatedVelocityFieldDataSetsType;

class VTK_PARALLEL_EXPORT vtkTemporalInterpolatedVelocityField : public vtkFunctionSet
{
public:
  vtkTypeRevisionMacro(vtkTemporalInterpolatedVelocityField,vtkFunctionSet);
  virtual void PrintSelf(ostream& os, vtkIndent indent);

  static vtkTemporalInterpolatedVelocityField *New();

  virtual int FunctionValues(double* x, double* u);


  void SelectVectors(const char *fieldName) 
    {this->SetVectorsSelection(fieldName);}

  void AddDataSetAtTime(int N, double T, vtkDataSet* dataset);


  void SetGeometryFixed(int g) 
  { this->GeometryFixed = g; }
  int GetGeometryFixed() 
  { return this->GeometryFixed; }


  bool GetCachedCellIds(vtkIdType id[2], int ds[2]);
  void SetCachedCellIds(vtkIdType id[2], int ds[2]);

  void ClearCache();

  int TestPoint(double* x);


  vtkGetVector3Macro(LastGoodVelocity,double);


  vtkGetMacro(CurrentWeight,double);
  
  bool InterpolatePoint(
    vtkPointData *outPD1, vtkPointData *outPD2, vtkIdType outIndex);
  bool InterpolatePointAtT(
    int T, vtkPointData *outPD, vtkIdType outIndex);

  bool GetVorticityData(
    int T, double pcoords[3], double *weights, 
    vtkGenericCell *&cell, vtkDoubleArray *cellVectors);

protected:
  vtkTemporalInterpolatedVelocityField();
  ~vtkTemporalInterpolatedVelocityField();

  vtkInterpolatedVelocityField *ivf[2];

  int FunctionValues(vtkDataSet* ds, double* x, double* f);
  virtual void SetVectorsSelection(const char *v);

  double vals1[3];
  double vals2[3];
  double times[2];
  double LastGoodVelocity[3];

  // The weight (0.0->1.0) of the value of T between the two avaiable 
  // time values for the current computation
  double CurrentWeight;
  // One minus the CurrentWeight 
  double OneMinusWeight;
  // A scaling factor used when calculating the CurrentWeight { 1.0/(T2-T1) }
  double ScaleCoeff;
  // If the two timesteps have the same geometry, then this flag is set and
  // weights can be re-used between them.
  int    GeometryFixed;
  //BTX
  // Datasets per time step
  vtkTInterpolatedVelocityFieldDataSetsType* DataSets[2];
  //ETX

private:
  // Hide this since we need multiple time steps and are using a different
  // function prototype
  virtual void AddDataSet(vtkDataSet*) {};

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

#endif

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