vtkCellLocator.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkCellLocator.h,v $

  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.

=========================================================================*/
#ifndef __vtkCellLocator_h
#define __vtkCellLocator_h

#include "vtkLocator.h"

class vtkCellArray;
class vtkGenericCell;
class vtkIdList;
class vtkNeighborCells;
class vtkPoints;

class VTK_FILTERING_EXPORT vtkCellLocator : public vtkLocator
{
public:
  vtkTypeRevisionMacro(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(double a0[3], double a1[3], double tol,
                                double& t, double x[3], double pcoords[3],
                                int &subId);


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


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


  void FindClosestPoint(double x[3], double closestPoint[3], vtkIdType &cellId,
                        int &subId, double& dist2);
  

  void FindClosestPoint(double x[3], double closestPoint[3],
                        vtkGenericCell *cell, vtkIdType &cellId, int &subId,
                        double& dist2);
  

  int FindClosestPointWithinRadius(double x[3], double radius,
                                   double closestPoint[3], vtkIdType &cellId,
                                   int &subId, double& dist2);
 

  int FindClosestPointWithinRadius(double x[3], double radius,
                                   double closestPoint[3],
                                   vtkGenericCell *cell, vtkIdType &cellId,
                                   int &subId, double& dist2);


  int FindClosestPointWithinRadius(double x[3], double radius,
                                   double closestPoint[3],
                                   vtkGenericCell *cell, vtkIdType &cellId,
                                   int &subId, double& 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();

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

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

  double Distance2ToBucket(double x[3], int nei[3]);
  double Distance2ToBounds(double x[3], double bounds[6]);
  
  int NumberOfCellsPerBucket; // cells per octant
  int NumberOfOctants; // number of octants in tree
  double Bounds[6]; // bounding box root octant
  int NumberOfParents; // number of parent octants
  double 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,
                    vtkIdType &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
  double (*CellBounds)[6];
//ETX - end tcl exclude

  void ComputeOctantBounds(int i, int j, int k);
  double OctantBounds[6]; //the bounds of the current octant
  int IsInOctantBounds(double x[3])
    {
    if ( this->OctantBounds[0] <= x[0] && x[0] <= this->OctantBounds[1] &&
         this->OctantBounds[2] <= x[1] && x[1] <= this->OctantBounds[3] &&
         this->OctantBounds[4] <= x[2] && x[2] <= this->OctantBounds[5] )
      {
      return 1;
      }
    else
      {
      return 0;
      }
    }

private:
  vtkCellLocator(const vtkCellLocator&);  // Not implemented.
  void operator=(const vtkCellLocator&);  // Not implemented.
};

#endif

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