vtkSPHQuarticKernel.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkSPHQuarticKernel.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 vtkSPHQuarticKernel_h
#define vtkSPHQuarticKernel_h
 
#include "vtkFiltersPointsModule.h" // For export macro
#include "vtkSPHKernel.h"
#include <algorithm> // For std::min()
 
class vtkIdList;
class vtkDoubleArray;
 
class VTKFILTERSPOINTS_EXPORT vtkSPHQuarticKernel : public vtkSPHKernel
{
public:
 
  static vtkSPHQuarticKernel* New();
  vtkTypeMacro(vtkSPHQuarticKernel, 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 = 2.5 - std::min(d, 2.5);
    double tmp2 = 1.5 - std::min(d, 1.5);
    double tmp3 = 0.5 - std::min(d, 0.5);
    return (tmp1 * tmp1 * tmp1 * tmp1 - 5.0 * tmp2 * tmp2 * tmp2 * tmp2 +
      10.0 * tmp3 * tmp3 * tmp3 * tmp3);
  }
 
 
  double ComputeDerivWeight(const double d) override
  {
    double tmp1 = 2.5 - std::min(d, 2.5);
    double tmp2 = 1.5 - std::min(d, 1.5);
    double tmp3 = 0.5 - std::min(d, 0.5);
    return (-4.0 * tmp1 * tmp1 * tmp1 + 20.0 * tmp2 * tmp2 * tmp2 - 40.0 * tmp3 * tmp3 * tmp3);
  }
 
protected:
  vtkSPHQuarticKernel();
  ~vtkSPHQuarticKernel() override;
 
private:
  vtkSPHQuarticKernel(const vtkSPHQuarticKernel&) = delete;
  void operator=(const vtkSPHQuarticKernel&) = delete;
};
 
#endif