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

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


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

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   this list of conditions and the following disclaimer.

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 * 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.

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   misrepresented as being the original software.

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=========================================================================*/
// .NAME vtkPointSet - abstract class for specifying dataset behavior
// .SECTION Description
// vtkPointSet is an abstract class that specifies the interface for 
// datasets that explicitly use "point" arrays to represent geometry.
// For example, vtkPolyData and vtkUnstructuredGrid require point arrays
// to specify point position, while vtkStructuredPoints generates point
// positions implicitly.

// .SECTION See Also
// vtkPolyData vtkStructuredGrid vtkUnstructuredGrid

#ifndef __vtkPointSet_h
#define __vtkPointSet_h

#include "vtkDataSet.h"
#include "vtkPointLocator.h"

class VTK_EXPORT vtkPointSet : public vtkDataSet
{
public:
  vtkTypeMacro(vtkPointSet,vtkDataSet);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Reset to an empty state and free any memory.
  void Initialize();

  // Description:
  // Copy the geometric structure of an input point set object.
  void CopyStructure(vtkDataSet *pd);

  // Description:
  // See vtkDataSet for additional information.
  int GetNumberOfPoints();
  float *GetPoint(int ptId) {return this->Points->GetPoint(ptId);};
  void GetPoint(int ptId, float x[3]) {this->Points->GetPoint(ptId,x);};
  int FindPoint(float x[3]);
  int FindPoint(float x, float y, float z) { return this->vtkDataSet::FindPoint(x, y, z);};
  int FindCell(float x[3], vtkCell *cell, int cellId, float tol2, int& subId, 
               float pcoords[3], float *weights);
  int FindCell(float x[3], vtkCell *cell, vtkGenericCell *gencell,
	       int cellId, float tol2, int& subId, 
               float pcoords[3], float *weights);

  // Description:
  // Get MTime which also considers its vtkPoints MTime.
  unsigned long GetMTime();

  // Description:
  // Compute the (X, Y, Z)  bounds of the data.
  void ComputeBounds();
  
  // Description:
  // Reclaim any unused memory.
  void Squeeze();

  // Description:
  // Specify point array to define point coordinates.
  vtkSetObjectMacro(Points,vtkPoints);
  vtkGetObjectMacro(Points,vtkPoints);

  // Description:
  // Detect refernce loop PointSet <-> locator.
  void UnRegister(vtkObject *o);
  
  // Description:
  // Get the net reference count. That is the count minus
  // any self created loops. This is used in the Source/Data
  // registration to properly free the objects.
  virtual int GetNetReferenceCount();

  // Description:
  // Return the actual size of the data in kilobytes. This number
  // is valid only after the pipeline has updated. The memory size
  // returned is guaranteed to be greater than or equal to the
  // memory required to represent the data (e.g., extra space in
  // arrays, etc. are not included in the return value). THIS METHOD
  // IS THREAD SAFE.
  unsigned long GetActualMemorySize();

protected:
  vtkPointSet();
  ~vtkPointSet();
  vtkPointSet(const vtkPointSet& ps);
  void operator=(const vtkPointSet&) {};

  vtkPoints *Points;
  vtkPointLocator *Locator;

};

inline int vtkPointSet::GetNumberOfPoints()
{
  if (this->Points)
    {
    return this->Points->GetNumberOfPoints();
    }
  else
    {
    return 0;
    }
}


#endif


