vtkSpline.h

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

  Program:   Visualization Toolkit
  Module:    vtkSpline.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 vtkSpline_h
#define vtkSpline_h

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

class vtkPiecewiseFunction;

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


  void SetParametricRange(double tMin, double tMax);
  void SetParametricRange(double tRange[2])
    {this->SetParametricRange(tRange[0],tRange[1]);}
  void GetParametricRange(double tRange[2]) const;


  vtkSetMacro(ClampValue,vtkTypeBool);
  vtkGetMacro(ClampValue,vtkTypeBool);
  vtkBooleanMacro(ClampValue,vtkTypeBool);

  virtual void Compute () = 0;

  virtual double Evaluate (double t) = 0;

  int GetNumberOfPoints();

  void AddPoint (double t, double x);

  void RemovePoint (double t);

  void RemoveAllPoints ();


  vtkSetMacro(Closed,vtkTypeBool);
  vtkGetMacro(Closed,vtkTypeBool);
  vtkBooleanMacro(Closed,vtkTypeBool);


  vtkSetClampMacro(LeftConstraint,int,0,3);
  vtkGetMacro(LeftConstraint,int);
  vtkSetClampMacro(RightConstraint,int,0,3);
  vtkGetMacro(RightConstraint,int);


  vtkSetMacro(LeftValue,double);
  vtkGetMacro(LeftValue,double);
  vtkSetMacro(RightValue,double);
  vtkGetMacro(RightValue,double);

  vtkMTimeType GetMTime() override;

  virtual void DeepCopy(vtkSpline *s);

protected:
  vtkSpline();
  ~vtkSpline() override;

  vtkMTimeType ComputeTime;
  vtkTypeBool ClampValue;
  double *Intervals;
  double *Coefficients;
  int LeftConstraint;
  double LeftValue;
  int RightConstraint;
  double RightValue;
  vtkPiecewiseFunction *PiecewiseFunction;
  vtkTypeBool Closed;

  // Explicitly specify the parametric range.
  double ParametricRange[2];

  // Helper methods
  double ComputeLeftDerivative();
  double ComputeRightDerivative();
  int FindIndex(int size, double t);

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

#endif