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