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Filtering/vtkScalarTree.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkScalarTree.h,v $
  Language:  C++


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
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 AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#ifndef __vtkScalarTree_h
#define __vtkScalarTree_h

#include "vtkObject.h"
#include "vtkDataSet.h"

typedef struct _vtkScalarRange
{
  float min;
  float max;
} vtkScalarRange;

class vtkFloatArray;

class VTK_FILTERING_EXPORT vtkScalarTree : public vtkObject
{
public:
  vtkTypeMacro(vtkScalarTree,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkScalarTree *New();


  vtkSetObjectMacro(DataSet,vtkDataSet);
  vtkGetObjectMacro(DataSet,vtkDataSet);


  vtkSetClampMacro(BranchingFactor,int,2,VTK_LARGE_INTEGER);
  vtkGetMacro(BranchingFactor,int);


  vtkGetMacro(Level,int);


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

  void BuildTree();
  
  void Initialize();

  void InitTraversal(float scalarValue);


  vtkCell *GetNextCell(vtkIdType &cellId, vtkIdList* &ptIds,
                       vtkDataArray *cellScalars);

protected:
  vtkScalarTree();
  ~vtkScalarTree();

  vtkDataSet *DataSet;
  vtkDataArray *Scalars;
  int MaxLevel;
  int Level;
  int BranchingFactor; //number of children per node

  vtkScalarRange *Tree; //pointerless scalar range tree
  int TreeSize; //allocated size of tree
  vtkTimeStamp BuildTime; //time at which tree was built

private:
  float ScalarValue; //current scalar value for traversal
  vtkIdType TreeIndex; //traversal location within tree
  vtkIdType LeafOffset; //offset to leaf nodes of tree
  int ChildNumber; //current child in traversal
  vtkIdType CellId; //current cell id being examined
  int FindStartLeaf(vtkIdType index, int level);
  int FindNextLeaf(vtkIdType index,int level);
private:
  vtkScalarTree(const vtkScalarTree&);  // Not implemented.
  void operator=(const vtkScalarTree&);  // Not implemented.
};

#endif

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