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

  Program:   Visualization Toolkit
  Module:    vtkBridgePointIteratorOne.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.

=========================================================================*/
// .NAME vtkBridgePointIteratorOne - Iterate over one point of a dataset.
// .SECTION See Also
// vtkGenericPointIterator, vtkBridgeDataSet

#ifndef __vtkBridgePointIteratorOne_h
#define __vtkBridgePointIteratorOne_h

#include "vtkBridgeExport.h"
#include "vtkGenericPointIterator.h"

class vtkBridgeDataSet;

class VTK_BRIDGE_EXPORT vtkBridgePointIteratorOne : public vtkGenericPointIterator
{
public:
  static vtkBridgePointIteratorOne *New();
  vtkTypeRevisionMacro(vtkBridgePointIteratorOne,vtkGenericPointIterator);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  // Description:
  // Move iterator to first position if any (loop initialization).
  void Begin();

  // Description:
  // Is there no point at iterator position? (exit condition).
  int IsAtEnd();

  // Description:
  // Move iterator to next position. (loop progression).
  // \pre not_off: !IsAtEnd()
  void Next();
 
  // Description:
  // Point at iterator position.
  // \pre not_off: !IsAtEnd()
  // \post result_exists: result!=0
  double *GetPosition();

  // Description:
  // Point at iterator position.
  // \pre not_off: !IsAtEnd()
  // \pre x_exists: x!=0
  void GetPosition(double x[3]);
  
  // Description:
  // Unique identifier for the point, could be non-contiguous
  // \pre not_off: !IsAtEnd()
  vtkIdType GetId();
  
  // Description:
  // Used internally by vtkBridgeDataSet.
  // Iterate over one point of identifier `id' on dataset `ds'.
  // \pre ds_can_be_null: ds!=0 || ds==0
  // \pre valid_id: vtkImplies(ds!=0,(id>=0)&&(id<=ds->GetNumberOfCells()))
  void InitWithOnePoint(vtkBridgeDataSet *ds,
                        vtkIdType id);
  
protected:
  // Description:
  // Default constructor.
  vtkBridgePointIteratorOne();
  
  // Description:
  // Destructor.
  virtual ~vtkBridgePointIteratorOne();
  
  vtkBridgeDataSet *DataSet; // the structure on which the objet iterates.
  vtkIdType Id; // the id at current position.
  int cIsAtEnd;
  
private:
  vtkBridgePointIteratorOne(const vtkBridgePointIteratorOne&); // Not implemented
  void operator=(const vtkBridgePointIteratorOne&); // Not implemented
};

#endif
