dox/Graphics/vtkSplineFilter.h

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

  Program:   Visualization Toolkit
  Module:    vtkSplineFilter.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 __vtkSplineFilter_h
#define __vtkSplineFilter_h

#include "vtkPolyDataAlgorithm.h"

#define VTK_SUBDIVIDE_SPECIFIED 0
#define VTK_SUBDIVIDE_LENGTH    1

#define VTK_TCOORDS_OFF                    0
#define VTK_TCOORDS_FROM_NORMALIZED_LENGTH 1
#define VTK_TCOORDS_FROM_LENGTH            2
#define VTK_TCOORDS_FROM_SCALARS           3

class vtkCellArray;
class vtkCellData;
class vtkFloatArray;
class vtkPointData;
class vtkPoints;
class vtkSpline;

class VTK_GRAPHICS_EXPORT vtkSplineFilter : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkSplineFilter,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkSplineFilter *New();


  vtkSetClampMacro(MaximumNumberOfSubdivisions,int,1,VTK_LARGE_INTEGER);
  vtkGetMacro(MaximumNumberOfSubdivisions,int);


  vtkSetClampMacro(Subdivide,int,VTK_SUBDIVIDE_SPECIFIED,VTK_SUBDIVIDE_LENGTH);
  vtkGetMacro(Subdivide,int);
  void SetSubdivideToSpecified()
    {this->SetSubdivide(VTK_SUBDIVIDE_SPECIFIED);}
  void SetSubdivideToLength()
    {this->SetSubdivide(VTK_SUBDIVIDE_LENGTH);}
  const char *GetSubdivideAsString();


  vtkSetClampMacro(NumberOfSubdivisions,int,1,VTK_LARGE_INTEGER);
  vtkGetMacro(NumberOfSubdivisions,int);


  vtkSetClampMacro(Length,double,0.0000001,VTK_DOUBLE_MAX);
  vtkGetMacro(Length,double);


  virtual void SetSpline(vtkSpline*);
  vtkGetObjectMacro(Spline,vtkSpline);


  vtkSetClampMacro(GenerateTCoords,int,VTK_TCOORDS_OFF,
                   VTK_TCOORDS_FROM_SCALARS);
  vtkGetMacro(GenerateTCoords,int);
  void SetGenerateTCoordsToOff()
    {this->SetGenerateTCoords(VTK_TCOORDS_OFF);}
  void SetGenerateTCoordsToNormalizedLength()
    {this->SetGenerateTCoords(VTK_TCOORDS_FROM_NORMALIZED_LENGTH);}
  void SetGenerateTCoordsToUseLength()
    {this->SetGenerateTCoords(VTK_TCOORDS_FROM_LENGTH);}
  void SetGenerateTCoordsToUseScalars()
    {this->SetGenerateTCoords(VTK_TCOORDS_FROM_SCALARS);}
  const char *GetGenerateTCoordsAsString();


  vtkSetClampMacro(TextureLength,double,0.000001,VTK_LARGE_INTEGER);
  vtkGetMacro(TextureLength,double);

protected:
  vtkSplineFilter();
  ~vtkSplineFilter();
  
  // Usual data generation method
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

  int       MaximumNumberOfSubdivisions;
  int       Subdivide;
  int       NumberOfSubdivisions;
  double     Length;
  vtkSpline *Spline;
  vtkSpline *XSpline;
  vtkSpline *YSpline;
  vtkSpline *ZSpline;
  int       GenerateTCoords;
  double     TextureLength; //this length is mapped to [0,1) texture space

  //helper methods
  int GeneratePoints(vtkIdType offset, vtkIdType npts, vtkIdType *pts, 
                     vtkPoints *inPts, vtkPoints *newPts, vtkPointData *pd, 
                     vtkPointData *outPD, int genTCoords,
                     vtkFloatArray *newTCoords);

  void GenerateLine(vtkIdType offset, vtkIdType numGenPts, vtkIdType inCellId,
                    vtkCellData *cd, vtkCellData *outCD, vtkCellArray *newLines);

  //helper members
  vtkFloatArray *TCoordMap;

private:
  vtkSplineFilter(const vtkSplineFilter&);  // Not implemented.
  void operator=(const vtkSplineFilter&);  // Not implemented.
};

#endif