---

Hybrid/vtkThinPlateSplineTransform.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkThinPlateSplineTransform.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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 __vtkThinPlateSplineTransform_h
#define __vtkThinPlateSplineTransform_h

#include "vtkWarpTransform.h"

#define VTK_RBF_CUSTOM 0
#define VTK_RBF_R      1
#define VTK_RBF_R2LOGR 2

class VTK_HYBRID_EXPORT vtkThinPlateSplineTransform : public vtkWarpTransform
{
public:
  vtkTypeRevisionMacro(vtkThinPlateSplineTransform,vtkWarpTransform);
  void PrintSelf(ostream& os, vtkIndent indent);
  static vtkThinPlateSplineTransform *New();


  vtkGetMacro(Sigma,double);
  vtkSetMacro(Sigma,double);


  void SetBasis(int basis);
  vtkGetMacro(Basis,int);
  void SetBasisToR() { this->SetBasis(VTK_RBF_R); };
  void SetBasisToR2LogR() { this->SetBasis(VTK_RBF_R2LOGR); };
  const char *GetBasisAsString();

//BTX
  /*! Set the radial basis function to a custom function.  You must supply
      both the function and its derivative with respect to r. */
  void SetBasisFunction(double (*U)(double r)) {
    if (this->BasisFunction == U) { return; }
    this->SetBasis(VTK_RBF_CUSTOM);
    this->BasisFunction = U; 
    this->Modified(); };
  void SetBasisDerivative(double (*dUdr)(double r, double &dU)) {
    this->BasisDerivative = dUdr; 
    this->Modified(); };    
//ETX


  void SetSourceLandmarks(vtkPoints *source);
  vtkGetObjectMacro(SourceLandmarks,vtkPoints);


  void SetTargetLandmarks(vtkPoints *target);
  vtkGetObjectMacro(TargetLandmarks,vtkPoints);

  unsigned long GetMTime();

  vtkAbstractTransform *MakeTransform();

protected:
  vtkThinPlateSplineTransform();
  ~vtkThinPlateSplineTransform();

  void InternalUpdate();

  void InternalDeepCopy(vtkAbstractTransform *transform);

  void ForwardTransformPoint(const float in[3], float out[3]);
  void ForwardTransformPoint(const double in[3], double out[3]);

  void ForwardTransformDerivative(const float in[3], float out[3],
                                  float derivative[3][3]);
  void ForwardTransformDerivative(const double in[3], double out[3],
                                  double derivative[3][3]);

  double Sigma;
  vtkPoints *SourceLandmarks;
  vtkPoints *TargetLandmarks;

//BTX
  // the radial basis function to use
  double (*BasisFunction)(double r);
  double (*BasisDerivative)(double r, double& dUdr);
//ETX
  int Basis;

  int NumberOfPoints;
  double **MatrixW;
private:
  vtkThinPlateSplineTransform(const vtkThinPlateSplineTransform&);  // Not implemented.
  void operator=(const vtkThinPlateSplineTransform&);  // Not implemented.
};

#endif

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