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

  Program:   Visualization Toolkit
  Module:    vtkMergePoints.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
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=========================================================================*/
// .NAME vtkMergePoints - merge exactly coincident points
// .SECTION Description
// vtkMergePoints is a locator object to quickly locate points in 3D.
// The primary difference between vtkMergePoints and its superclass
// vtkPointLocator is that vtkMergePoints merges precisely coincident points
// and is therefore much faster.
// .SECTION See Also
// vtkCleanPolyData

#ifndef __vtkMergePoints_h
#define __vtkMergePoints_h

#include "vtkPointLocator.h"

class VTK_EXPORT vtkMergePoints : public vtkPointLocator
{
public:
  static vtkMergePoints *New();
  vtkTypeMacro(vtkMergePoints,vtkPointLocator);

  // Description:
  // Determine whether point given by x[3] has been inserted into points list.
  // Return id of previously inserted point if this is true, otherwise return
  // -1.
  int IsInsertedPoint(float x[3]);
  int IsInsertedPoint(float x, float  y, float z)
    {return this->vtkPointLocator::IsInsertedPoint(x, y, z); };

  // Description:
  // Determine whether point given by x[3] has been inserted into points list.
  // Return 0 if point was already in the list, otherwise return 1. If the
  // point was not in the list, it will be ADDED.  In either case, the id of
  // the point (newly inserted or not) is returned in the ptId argument.
  // Note this combines the functionality of IsInsertedPoint() followed
  // by a call to InsertNextPoint().
  int InsertUniquePoint(float x[3], int &ptId);
  
protected:
  vtkMergePoints() {};
  ~vtkMergePoints() {};
  vtkMergePoints(const vtkMergePoints&) {};
  void operator=(const vtkMergePoints&) {};
  
};

#endif


