vtkSPHCubicKernel.h

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

  Program:   Visualization Toolkit
  Module:    vtkSPHCubicKernel.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 vtkSPHCubicKernel_h
#define vtkSPHCubicKernel_h

#include "vtkFiltersPointsModule.h" // For export macro
#include "vtkSPHKernel.h"
#include <algorithm> // For std::min()

class vtkIdList;
class vtkDoubleArray;


class VTKFILTERSPOINTS_EXPORT vtkSPHCubicKernel : public vtkSPHKernel
{
public:

  static vtkSPHCubicKernel *New();
  vtkTypeMacro(vtkSPHCubicKernel,vtkSPHKernel);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  void Initialize(vtkAbstractPointLocator *loc, vtkDataSet *ds,
                          vtkPointData *pd) override;


  double ComputeFunctionWeight(const double d) override
  {
    double tmp1 = 2.0 - std::min(d,2.0);
    double tmp2 = 1.0 - std::min(d,1.0);
    return (0.25*tmp1*tmp1*tmp1 - tmp2*tmp2*tmp2);
  }


  double ComputeDerivWeight(const double d) override
  {
    double tmp1 = 2.0 - std::min(d,2.0);
    double tmp2 = 1.0 - std::min(d,1.0);
    return (-0.75*tmp1*tmp1 + 3.0*tmp2*tmp2);
  }

protected:
  vtkSPHCubicKernel();
  ~vtkSPHCubicKernel() override;

private:
  vtkSPHCubicKernel(const vtkSPHCubicKernel&) = delete;
  void operator=(const vtkSPHCubicKernel&) = delete;
};

#endif