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125 lines
4.6 KiB
C
125 lines
4.6 KiB
C
//----------------------------------------------------------------------
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// File: kd_util.h
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// Programmer: Sunil Arya and David Mount
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// Description: Common utilities for kd- trees
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// Last modified: 01/04/05 (Version 1.0)
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//----------------------------------------------------------------------
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// Copyright (c) 1997-2005 University of Maryland and Sunil Arya and
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// David Mount. All Rights Reserved.
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//
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// This software and related documentation is part of the Approximate
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// Nearest Neighbor Library (ANN). This software is provided under
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// the provisions of the Lesser GNU Public License (LGPL). See the
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// file ../ReadMe.txt for further information.
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//
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// The University of Maryland (U.M.) and the authors make no
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// representations about the suitability or fitness of this software for
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// any purpose. It is provided "as is" without express or implied
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// warranty.
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//----------------------------------------------------------------------
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// History:
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// Revision 0.1 03/04/98
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// Initial release
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//----------------------------------------------------------------------
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#ifndef ANN_kd_util_H
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#define ANN_kd_util_H
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#include "kd_tree.h" // kd-tree declarations
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//----------------------------------------------------------------------
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// externally accessible functions
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//----------------------------------------------------------------------
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double annAspectRatio( // compute aspect ratio of box
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int dim, // dimension
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const ANNorthRect &bnd_box); // bounding cube
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void annEnclRect( // compute smallest enclosing rectangle
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ANNpointArray pa, // point array
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ANNidxArray pidx, // point indices
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int n, // number of points
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int dim, // dimension
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ANNorthRect &bnds); // bounding cube (returned)
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void annEnclCube( // compute smallest enclosing cube
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ANNpointArray pa, // point array
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ANNidxArray pidx, // point indices
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int n, // number of points
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int dim, // dimension
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ANNorthRect &bnds); // bounding cube (returned)
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ANNdist annBoxDistance( // compute distance from point to box
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const ANNpoint q, // the point
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const ANNpoint lo, // low point of box
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const ANNpoint hi, // high point of box
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int dim); // dimension of space
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ANNcoord annSpread( // compute point spread along dimension
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ANNpointArray pa, // point array
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ANNidxArray pidx, // point indices
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int n, // number of points
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int d); // dimension to check
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void annMinMax( // compute min and max coordinates along dim
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ANNpointArray pa, // point array
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ANNidxArray pidx, // point indices
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int n, // number of points
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int d, // dimension to check
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ANNcoord& min, // minimum value (returned)
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ANNcoord& max); // maximum value (returned)
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int annMaxSpread( // compute dimension of max spread
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ANNpointArray pa, // point array
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ANNidxArray pidx, // point indices
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int n, // number of points
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int dim); // dimension of space
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void annMedianSplit( // split points along median value
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ANNpointArray pa, // points to split
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ANNidxArray pidx, // point indices
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int n, // number of points
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int d, // dimension along which to split
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ANNcoord &cv, // cutting value
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int n_lo); // split into n_lo and n-n_lo
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void annPlaneSplit( // split points by a plane
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ANNpointArray pa, // points to split
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ANNidxArray pidx, // point indices
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int n, // number of points
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int d, // dimension along which to split
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ANNcoord cv, // cutting value
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int &br1, // first break (values < cv)
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int &br2); // second break (values == cv)
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void annBoxSplit( // split points by a box
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ANNpointArray pa, // points to split
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ANNidxArray pidx, // point indices
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int n, // number of points
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int dim, // dimension of space
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ANNorthRect &box, // the box
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int &n_in); // number of points inside (returned)
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int annSplitBalance( // determine balance factor of a split
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ANNpointArray pa, // points to split
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ANNidxArray pidx, // point indices
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int n, // number of points
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int d, // dimension along which to split
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ANNcoord cv); // cutting value
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void annBox2Bnds( // convert inner box to bounds
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const ANNorthRect &inner_box, // inner box
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const ANNorthRect &bnd_box, // enclosing box
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int dim, // dimension of space
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int &n_bnds, // number of bounds (returned)
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ANNorthHSArray &bnds); // bounds array (returned)
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void annBnds2Box( // convert bounds to inner box
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const ANNorthRect &bnd_box, // enclosing box
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int dim, // dimension of space
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int n_bnds, // number of bounds
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ANNorthHSArray bnds, // bounds array
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ANNorthRect &inner_box); // inner box (returned)
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#endif
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