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graphics/vtkCellLocator.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkCellLocator.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 __vtkCellLocator_h
#define __vtkCellLocator_h

#include "vtkLocator.h"

class vtkNeighborCells;

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

  static vtkCellLocator *New();

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

  vtkSetMacro(CacheCellBounds,int);
  vtkGetMacro(CacheCellBounds,int);
  vtkBooleanMacro(CacheCellBounds,int);

  virtual int IntersectWithLine(float a0[3], float a1[3], float tol,
            float& t, float x[3], float pcoords[3],
            int &subId);

  virtual int IntersectWithLine(float a0[3], float a1[3], float tol,
            float& t, float x[3], float pcoords[3],
            int &subId, int &cellId);

  virtual int IntersectWithLine(float a0[3], float a1[3], float tol,
            float& t, float x[3], float pcoords[3],
            int &subId, int &cellId, vtkGenericCell *cell);

  void FindClosestPoint(float x[3], float closestPoint[3], int &cellId,
         int &subId, float& dist2);
  
  void FindClosestPoint(float x[3], float closestPoint[3],
         vtkGenericCell *cell, int &cellId, int &subId,
         float& dist2);
  
  int FindClosestPointWithinRadius(float x[3], float radius,
               float closestPoint[3], int &cellId,
               int &subId, float& dist2);
 
  int FindClosestPointWithinRadius(float x[3], float radius,
               float closestPoint[3],
               vtkGenericCell *cell, int &cellId,
               int &subId, float& dist2);

  int FindClosestPointWithinRadius(float x[3], float radius,
               float closestPoint[3],
               vtkGenericCell *cell, int &cellId,
               int &subId, float& dist2, int &inside);
  
  virtual vtkIdList *GetCells(int bucket);

  virtual int GetNumberOfBuckets(void);

  void FreeSearchStructure();
  void BuildLocator();
  void GenerateRepresentation(int level, vtkPolyData *pd);
  
protected:
  vtkCellLocator();
  ~vtkCellLocator();
  vtkCellLocator(const vtkCellLocator&) {};
  void operator=(const vtkCellLocator&) {};

  void GetBucketNeighbors(int ijk[3], int ndivs, int level);
  void GetOverlappingBuckets(float x[3], int ijk[3], float dist, 
                             int prevMinLevel[3], int prevMaxLevel[3]);

  void ClearCellHasBeenVisited();
  void ClearCellHasBeenVisited(int id);

  float Distance2ToBucket(float x[3], int nei[3]);
  float Distance2ToBounds(float x[3], float bounds[6]);
  
  int NumberOfCellsPerBucket; // cells per octant
  int NumberOfOctants; // number of octants in tree
  float Bounds[6]; // bounding box root octant
  int NumberOfParents; // number of parent octants
  float H[3]; // width of leaf octant in x-y-z directions
  int NumberOfDivisions; // number of "leaf" octant sub-divisions
  vtkIdList **Tree; // octree

  void MarkParents(void*, int, int, int, int, int);
  void GetChildren(int idx, int level, int children[8]);
  int GenerateIndex(int offset, int numDivs, int i, int j, int k, int &idx);
  void GenerateFace(int face, int numDivs, int i, int j, int k,
                    vtkPoints *pts, vtkCellArray *polys);

  vtkNeighborCells *Buckets;
  unsigned char *CellHasBeenVisited;
  unsigned char QueryNumber;
  int CacheCellBounds;
//BTX - begin tcl exclude
  float (*CellBounds)[6];
//ETX - end tcl exclude
};

#endif

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