vtkGenericCellTessellator.h

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

  Program:   Visualization Toolkit
  Module:    vtkGenericCellTessellator.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 vtkGenericCellTessellator_h
#define vtkGenericCellTessellator_h

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

class vtkCellArray;
class vtkDoubleArray;
class vtkCollection;
class vtkGenericAttributeCollection;
class vtkGenericAdaptorCell;
class vtkGenericCellIterator;
class vtkPointData;
class vtkGenericDataSet;

//-----------------------------------------------------------------------------
//
// The tessellation object
class VTKCOMMONDATAMODEL_EXPORT vtkGenericCellTessellator : public vtkObject
{
public:
  vtkTypeMacro(vtkGenericCellTessellator,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  virtual void TessellateFace(vtkGenericAdaptorCell *cell,
                              vtkGenericAttributeCollection *att,
                              vtkIdType index,
                              vtkDoubleArray *points,
                              vtkCellArray *cellArray,
                              vtkPointData *internalPd)=0;


  virtual void Tessellate(vtkGenericAdaptorCell *cell,
                          vtkGenericAttributeCollection *att,
                          vtkDoubleArray *points,
                          vtkCellArray *cellArray,
                          vtkPointData *internalPd )=0;


  virtual void Triangulate(vtkGenericAdaptorCell *cell,
                           vtkGenericAttributeCollection *att,
                           vtkDoubleArray *points,
                           vtkCellArray *cellArray,
                           vtkPointData *internalPd)=0;


  virtual void SetErrorMetrics(vtkCollection *someErrorMetrics);
  vtkGetObjectMacro(ErrorMetrics,vtkCollection);

  virtual void Initialize(vtkGenericDataSet *ds)=0;

  void InitErrorMetrics(vtkGenericDataSet *ds);


  vtkGetMacro(Measurement,int);
  vtkSetMacro(Measurement,int);

  void GetMaxErrors(double *errors);

protected:
  vtkGenericCellTessellator();
  ~vtkGenericCellTessellator();


  int RequiresEdgeSubdivision(double *left, double *mid, double *right,
                              double alpha);



  virtual void UpdateMaxError(double *leftPoint, double *midPoint,
                              double *rightPoint, double alpha);

  void ResetMaxErrors();

  vtkCollection *ErrorMetrics;

  void SetGenericCell(vtkGenericAdaptorCell *cell);

  vtkGenericDataSet *DataSet;

  int Measurement; // if true, measure the quality of the fixed subdivision.
  double *MaxErrors; // max error for each error metric, for measuring the
  // quality of a fixed subdivision.
  int MaxErrorsCapacity;

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

#endif