vtkSpline.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkSpline.h,v $

  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 "vtkObject.h"

class vtkPiecewiseFunction;

class VTK_FILTERING_EXPORT vtkSpline : public vtkObject
{
public:
  vtkTypeRevisionMacro(vtkSpline,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  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,int);
  vtkGetMacro(ClampValue,int);
  vtkBooleanMacro(ClampValue,int);

  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,int);
  vtkGetMacro(Closed,int);
  vtkBooleanMacro(Closed,int);


  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);

  unsigned long GetMTime();

  virtual void DeepCopy(vtkSpline *s);

protected:
  vtkSpline();
  ~vtkSpline();

  unsigned long ComputeTime;
  int ClampValue;
  double *Intervals;
  double *Coefficients;
  int LeftConstraint;
  double LeftValue;
  int RightConstraint;
  double RightValue;
  vtkPiecewiseFunction *PiecewiseFunction;
  int 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&);  // Not implemented.
  void operator=(const vtkSpline&);  // Not implemented.
};

#endif

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