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

  Program:   Visualization Toolkit
  Module:    vtkQuadric.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.

=========================================================================*/
/**
 * @class   vtkQuadric
 * @brief   evaluate implicit quadric function
 *
 * vtkQuadric evaluates the quadric function F(x,y,z) = a0*x^2 + a1*y^2 +
 * a2*z^2 + a3*x*y + a4*y*z + a5*x*z + a6*x + a7*y + a8*z + a9. vtkQuadric is
 * a concrete implementation of vtkImplicitFunction.
*/

#ifndef vtkQuadric_h
#define vtkQuadric_h

#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkImplicitFunction.h"

class VTKCOMMONDATAMODEL_EXPORT vtkQuadric : public vtkImplicitFunction
{
public:
  vtkTypeMacro(vtkQuadric,vtkImplicitFunction);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * Construct quadric with all coefficients = 1.
   */
  static vtkQuadric *New();

  //@{
  /**
   * Evaluate quadric equation.
   */
  using vtkImplicitFunction::EvaluateFunction;
  double EvaluateFunction(double x[3]) override;
  //@}

  /**
   * Evaluate the gradient to the quadric equation.
   */
  void EvaluateGradient(double x[3], double g[3]) override;

  //@{
  /**
   * Set / get the 10 coefficients of the quadric equation.
   */
  void SetCoefficients(double a[10]);
  void SetCoefficients(double a0, double a1, double a2, double a3, double a4,
                       double a5, double a6, double a7, double a8, double a9);
  vtkGetVectorMacro(Coefficients,double,10);
  //@}

protected:
  vtkQuadric();
  ~vtkQuadric() override {}

  double Coefficients[10];

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

#endif


