ANNx.h

Go to the documentation of this file.

//----------------------------------------------------------------------
// File:                        ANNx.h
// Programmer:          Sunil Arya and David Mount
// Description:         Internal include file for ANN
// Last modified:       01/27/10 (Version 1.1.2)
//
//      These declarations are of use in manipulating some of
//      the internal data objects appearing in ANN, but are not
//      needed for applications just using the nearest neighbor
//      search.
//
//      Typical users of ANN should not need to access this file.
//----------------------------------------------------------------------
// Copyright (c) 1997-2010 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 LO, HI, IN, OUT to ANN_LO, ANN_HI, etc.
//      Revision 1.1.2  01/27/10
//              Fixed minor compilation bugs for new versions of gcc
//----------------------------------------------------------------------

#ifndef ANNx_H
#define ANNx_H

#include <iomanip>                              // I/O manipulators
#include <ANN/ANN.h>                    // ANN includes

//----------------------------------------------------------------------
//      Global constants and types
//----------------------------------------------------------------------
enum    {ANN_LO=0, ANN_HI=1};   // splitting indices
enum    {ANN_IN=0, ANN_OUT=1};  // shrinking indices
                                                                // what to do in case of error
enum ANNerr {ANNwarn = 0, ANNabort = 1};

//----------------------------------------------------------------------
//      Maximum number of points to visit
//      We have an option for terminating the search early if the
//      number of points visited exceeds some threshold.  If the
//      threshold is 0 (its default)  this means there is no limit
//      and the algorithm applies its normal termination condition.
//----------------------------------------------------------------------

extern int              ANNmaxPtsVisited;       // maximum number of pts visited
extern int              ANNptsVisited;          // number of pts visited in search

//----------------------------------------------------------------------
//      Global function declarations
//----------------------------------------------------------------------

void annError(                                  // ANN error routine
        const char*             msg,            // error message
        ANNerr                  level);         // level of error

void annPrintPt(                                // print a point
        ANNpoint                pt,                     // the point
        int                             dim,            // the dimension
        std::ostream    &out);          // output stream

//----------------------------------------------------------------------
//      Orthogonal (axis aligned) rectangle
//      Orthogonal rectangles are represented by two points, one
//      for the lower left corner (min coordinates) and the other
//      for the upper right corner (max coordinates).
//
//      The constructor initializes from either a pair of coordinates,
//      pair of points, or another rectangle.  Note that all constructors
//      allocate new point storage. The destructor deallocates this
//      storage.
//
//      BEWARE: Orthogonal rectangles should be passed ONLY BY REFERENCE.
//      (C++'s default copy constructor will not allocate new point
//      storage, then on return the destructor free's storage, and then
//      you get into big trouble in the calling procedure.)
//----------------------------------------------------------------------

class ANNorthRect {
public:
        ANNpoint                lo;                     // rectangle lower bounds
        ANNpoint                hi;                     // rectangle upper bounds
//
        ANNorthRect(                            // basic constructor
        int                             dd,                     // dimension of space
        ANNcoord                l=0,            // default is empty
        ANNcoord                h=0)
        {  lo = annAllocPt(dd, l);  hi = annAllocPt(dd, h); }

        ANNorthRect(                            // (almost a) copy constructor
        int                             dd,                     // dimension
        const                   ANNorthRect &r) // rectangle to copy
        {  lo = annCopyPt(dd, r.lo);  hi = annCopyPt(dd, r.hi);  }

        ANNorthRect(                            // construct from points
        int                             dd,                     // dimension
        ANNpoint                l,                      // low point
        ANNpoint                h)                      // hight point
        {  lo = annCopyPt(dd, l);  hi = annCopyPt(dd, h);  }

        ~ANNorthRect()                          // destructor
    {  annDeallocPt(lo);  annDeallocPt(hi);  }

        ANNbool inside(int dim, ANNpoint p);// is point p inside rectangle?
};

void annAssignRect(                             // assign one rect to another
        int                             dim,            // dimension (both must be same)
        ANNorthRect             &dest,          // destination (modified)
        const ANNorthRect &source);     // source

//----------------------------------------------------------------------
//      Orthogonal (axis aligned) halfspace
//      An orthogonal halfspace is represented by an integer cutting
//      dimension cd, coordinate cutting value, cv, and side, sd, which is
//      either +1 or -1. Our convention is that point q lies in the (closed)
//      halfspace if (q[cd] - cv)*sd >= 0.
//----------------------------------------------------------------------

class ANNorthHalfSpace {
public:
        int                             cd;                     // cutting dimension
        ANNcoord                cv;                     // cutting value
        int                             sd;                     // which side
//
        ANNorthHalfSpace()                      // default constructor
        {  cd = 0; cv = 0;  sd = 0;  }

        ANNorthHalfSpace(                       // basic constructor
        int                             cdd,            // dimension of space
        ANNcoord                cvv,            // cutting value
        int                             sdd)            // side
        {  cd = cdd;  cv = cvv;  sd = sdd;  }

        ANNbool in(ANNpoint q) const    // is q inside halfspace?
        {  return  (ANNbool) ((q[cd] - cv)*sd >= 0);  }

        ANNbool out(ANNpoint q) const   // is q outside halfspace?
        {  return  (ANNbool) ((q[cd] - cv)*sd < 0);  }

        ANNdist dist(ANNpoint q) const  // (squared) distance from q
        {  return  (ANNdist) ANN_POW(q[cd] - cv);  }

        void setLowerBound(int d, ANNpoint p)// set to lower bound at p[i]
        {  cd = d;  cv = p[d];  sd = +1;  }

        void setUpperBound(int d, ANNpoint p)// set to upper bound at p[i]
        {  cd = d;  cv = p[d];  sd = -1;  }

        void project(ANNpoint &q)               // project q (modified) onto halfspace
        {  if (out(q)) q[cd] = cv;  }
};

                                                                // array of halfspaces
typedef ANNorthHalfSpace *ANNorthHSArray;

#endif