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//----------------------------------------------------------------------
// File: bd_tree.h
// Programmer: David Mount
// Description: Declarations for standard bd-tree routines
// Last modified: 01/04/05 (Version 1.0)
//----------------------------------------------------------------------
// Copyright (c) 1997-2005 University of Maryland and Sunil Arya and
// David Mount. All Rights Reserved.
//
// This software and related documentation is part of the Approximate
// Nearest Neighbor Library (ANN). This software is provided under
// the provisions of the Lesser GNU Public License (LGPL). See the
// file ../ReadMe.txt for further information.
//
// The University of Maryland (U.M.) and the authors make no
// representations about the suitability or fitness of this software for
// any purpose. It is provided "as is" without express or implied
// warranty.
//----------------------------------------------------------------------
// History:
// Revision 0.1 03/04/98
// Initial release
// Revision 1.0 04/01/05
// Changed IN, OUT to ANN_IN, ANN_OUT
//----------------------------------------------------------------------
#ifndef ANN_bd_tree_H
#define ANN_bd_tree_H
#include <ANN/ANNx.h> // all ANN includes
#include "kd_tree.h" // kd-tree includes
#include "def_debug_bt.h"
namespace geom_bt {
//----------------------------------------------------------------------
// bd-tree shrinking node.
// The main addition in the bd-tree is the shrinking node, which
// is declared here.
//
// Shrinking nodes are defined by list of orthogonal halfspaces.
// These halfspaces define a (possibly unbounded) orthogonal
// rectangle. There are two children, in and out. Points that
// lie within this rectangle are stored in the in-child, and the
// other points are stored in the out-child.
//
// We use a list of orthogonal halfspaces rather than an
// orthogonal rectangle object because typically the number of
// sides of the shrinking box will be much smaller than the
// worst case bound of 2*dim.
//
// BEWARE: Note that constructor just copies the pointer to the
// bounding array, but the destructor deallocates it. This is
// rather poor practice, but happens to be convenient. The list
// is allocated in the bd-tree building procedure rbd_tree() just
// prior to construction, and is used for no other purposes.
//
// WARNING: In the near neighbor searching code it is assumed that
// the list of bounding halfspaces is irredundant, meaning that there
// are no two distinct halfspaces in the list with the same outward
// pointing normals.
//----------------------------------------------------------------------
class ANNbd_shrink : public ANNkd_node // splitting node of a kd-tree
{
int n_bnds; // number of bounding halfspaces
ANNorthHSArray bnds; // list of bounding halfspaces
ANNkd_ptr child[2]; // in and out children
public:
ANNbd_shrink( // constructor
int nb, // number of bounding halfspaces
ANNorthHSArray bds, // list of bounding halfspaces
ANNkd_ptr ic=NULL, ANNkd_ptr oc=NULL) // children
{
n_bnds = nb; // cutting dimension
bnds = bds; // assign bounds
child[ANN_IN] = ic; // set children
child[ANN_OUT] = oc;
}
~ANNbd_shrink() // destructor
{
if (child[ANN_IN]!= NULL && child[ANN_IN]!= KD_TRIVIAL)
delete child[ANN_IN];
if (child[ANN_OUT]!= NULL&& child[ANN_OUT]!= KD_TRIVIAL)
delete child[ANN_OUT];
if (bnds != NULL)
delete [] bnds; // delete bounds
}
virtual void getStats( // get tree statistics
int dim, // dimension of space
ANNkdStats &st, // statistics
ANNorthRect &bnd_box); // bounding box
virtual void print(int level, ostream &out);// print node
#ifndef FOR_R_TDA
virtual void dump(ostream &out); // dump node
#endif
virtual void ann_search(ANNdist); // standard search
virtual void ann_pri_search(ANNdist); // priority search
virtual void ann_FR_search(ANNdist); // fixed-radius search
};
}
#endif
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