dox/Graphics/vtkTubeFilter.h

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

  Program:   Visualization Toolkit
  Module:    vtkTubeFilter.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 __vtkTubeFilter_h
#define __vtkTubeFilter_h

#include "vtkPolyDataAlgorithm.h"

#define VTK_VARY_RADIUS_OFF 0
#define VTK_VARY_RADIUS_BY_SCALAR 1
#define VTK_VARY_RADIUS_BY_VECTOR 2
#define VTK_VARY_RADIUS_BY_ABSOLUTE_SCALAR 3

#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 vtkDataArray;
class vtkFloatArray;
class vtkPointData;
class vtkPoints;

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

  static vtkTubeFilter *New();


  vtkSetClampMacro(Radius,double,0.0,VTK_DOUBLE_MAX);
  vtkGetMacro(Radius,double);


  vtkSetClampMacro(VaryRadius,int,
                   VTK_VARY_RADIUS_OFF,VTK_VARY_RADIUS_BY_ABSOLUTE_SCALAR);
  vtkGetMacro(VaryRadius,int);
  void SetVaryRadiusToVaryRadiusOff()
    {this->SetVaryRadius(VTK_VARY_RADIUS_OFF);};
  void SetVaryRadiusToVaryRadiusByScalar()
    {this->SetVaryRadius(VTK_VARY_RADIUS_BY_SCALAR);};
  void SetVaryRadiusToVaryRadiusByVector()
    {this->SetVaryRadius(VTK_VARY_RADIUS_BY_VECTOR);};
  void SetVaryRadiusToVaryRadiusByAbsoluteScalar()
    {this->SetVaryRadius(VTK_VARY_RADIUS_BY_ABSOLUTE_SCALAR);};
  const char *GetVaryRadiusAsString();


  vtkSetClampMacro(NumberOfSides,int,3,VTK_LARGE_INTEGER);
  vtkGetMacro(NumberOfSides,int);


  vtkSetMacro(RadiusFactor,double);
  vtkGetMacro(RadiusFactor,double);


  vtkSetVector3Macro(DefaultNormal,double);
  vtkGetVectorMacro(DefaultNormal,double,3);


  vtkSetMacro(UseDefaultNormal,int);
  vtkGetMacro(UseDefaultNormal,int);
  vtkBooleanMacro(UseDefaultNormal,int);


  vtkSetMacro(SidesShareVertices, int);
  vtkGetMacro(SidesShareVertices, int);
  vtkBooleanMacro(SidesShareVertices, int);


  vtkSetMacro(Capping,int);
  vtkGetMacro(Capping,int);
  vtkBooleanMacro(Capping,int);


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


  vtkSetClampMacro(Offset,int,0,VTK_LARGE_INTEGER);
  vtkGetMacro(Offset,int);


  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:
  vtkTubeFilter();
  ~vtkTubeFilter() {}

  // Usual data generation method
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

  double Radius; //minimum radius of tube
  int VaryRadius; //controls radius variation
  int NumberOfSides; //number of sides to create tube
  double RadiusFactor; //maxium allowablew radius
  double DefaultNormal[3];
  int UseDefaultNormal;
  int SidesShareVertices;
  int Capping; //control whether tubes are capped
  int OnRatio; //control the generation of the sides of the tube
  int Offset;  //control the generation of the sides
  int GenerateTCoords; //control texture coordinate generation
  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,
                     vtkFloatArray *newNormals, vtkDataArray *inScalars,
                     double range[2], vtkDataArray *inVectors, double maxNorm, 
                     vtkDataArray *inNormals);
  void GenerateStrips(vtkIdType offset, vtkIdType npts, vtkIdType *pts, 
                      vtkIdType inCellId, vtkCellData *cd, vtkCellData *outCD,
                      vtkCellArray *newStrips);
  void GenerateTextureCoords(vtkIdType offset, vtkIdType npts, vtkIdType *pts, 
                             vtkPoints *inPts, vtkDataArray *inScalars,
                            vtkFloatArray *newTCoords);
  vtkIdType ComputeOffset(vtkIdType offset,vtkIdType npts);
  
  // Helper data members
  double Theta;

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

#endif