| 1 | // -*- C++ -*-
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| 2 | ///////////////////////////////////////////////////////////////////////////////
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| 3 | // File: quadtree.h //
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| 4 | // Description: header file for quadtree management (Cquadtree class) //
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| 5 | // This file is part of the SISCone project. //
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| 6 | // For more details, see http://projects.hepforge.org/siscone //
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| 7 | // //
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| 8 | // Copyright (c) 2006 Gavin Salam and Gregory Soyez //
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| 9 | // //
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| 10 | // This program is free software; you can redistribute it and/or modify //
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| 11 | // it under the terms of the GNU General Public License as published by //
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| 12 | // the Free Software Foundation; either version 2 of the License, or //
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| 13 | // (at your option) any later version. //
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| 14 | // //
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| 15 | // This program is distributed in the hope that it will be useful, //
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| 16 | // but WITHOUT ANY WARRANTY; without even the implied warranty of //
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| 17 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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| 18 | // GNU General Public License for more details. //
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| 19 | // //
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| 20 | // You should have received a copy of the GNU General Public License //
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| 21 | // along with this program; if not, write to the Free Software //
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| 22 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
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| 23 | // //
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| 24 | // $Revision: 1.1 $//
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| 25 | // $Date: 2008-10-02 15:20:27 $//
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| 26 | ///////////////////////////////////////////////////////////////////////////////
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| 27 |
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| 28 | #ifndef __QUADTREE_H__
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| 29 | #define __QUADTREE_H__
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| 30 |
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| 31 | #include "momentum.h"
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| 32 | #include <stdio.h>
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| 33 |
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| 34 | namespace siscone{
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| 35 |
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| 36 | /**
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| 37 | * \class Cquadtree
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| 38 | * \brief Implementation of a 2D quadtree.
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| 39 | *
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| 40 | * This class implements the traditional two-dimensional quadtree.
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| 41 | * The elements at each node are of 'Cmomentum' type.
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| 42 | */
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| 43 | class Cquadtree{
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| 44 | public:
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| 45 | /// default ctor
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| 46 | Cquadtree();
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| 47 |
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| 48 | /// ctor with initialisation (see init for details)
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| 49 | Cquadtree(double _x, double _y, double _half_size_x, double _half_size_y);
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| 50 |
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| 51 | /// default destructor
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| 52 | /// at destruction, everything is destroyed except
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| 53 | /// physical values at the leaves
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| 54 | ~Cquadtree();
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| 55 |
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| 56 | /**
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| 57 | * init the tree.
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| 58 | * By initializing the tree, we mean setting the cell parameters
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| 59 | * and preparing the object to act as a seed for a new tree.
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| 60 | * \param _x x-position of the center
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| 61 | * \param _y y-position of the center
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| 62 | * \param _half_size_x x-size of the cell
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| 63 | * \param _half_size_y y-size of the cell
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| 64 | * \return 0 on success, 1 on error. Note that if the cell or its
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| 65 | * parent is already filled, we return an error.
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| 66 | */
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| 67 | int init(double _x, double _y, double _half_size_x, double _half_size_y);
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| 68 |
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| 69 | /**
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| 70 | * adding a particle to the tree.
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| 71 | * This method adds one vector to the quadtree structure which
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| 72 | * is updated consequently.
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| 73 | * \param v_add vector to add
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| 74 | * \return 0 on success 1 on error
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| 75 | */
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| 76 | int add(Cmomentum *v_add);
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| 77 |
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| 78 | /**
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| 79 | * circle intersection.
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| 80 | * computes the intersection with a circle of given centre and radius.
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| 81 | * The output takes the form of a quadtree with all squares included
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| 82 | * in the circle.
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| 83 | * \param cx circle centre x coordinate
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| 84 | * \param cy circle centre y coordinate
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| 85 | * \param cR2 circle radius SQUARED
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| 86 | * \return the checksum for that intersection
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| 87 | */
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| 88 | Creference circle_intersect(double cx, double cy, double cR2);
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| 89 |
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| 90 | /**
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| 91 | * output a data file for drawing the grid.
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| 92 | * This can be used to output a data file containing all the
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| 93 | * grid subdivisions. The file contents is as follows:
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| 94 | * first and second columns give center of the cell, the third
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| 95 | * gives the size.
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| 96 | * \param flux opened stream to write to
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| 97 | * \return 0 on success, 1 on error
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| 98 | */
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| 99 | int save(FILE *flux);
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| 100 |
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| 101 | /**
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| 102 | * output a data file for drawing the tree leaves.
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| 103 | * This can be used to output a data file containing all the
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| 104 | * tree leaves. The file contents is as follows:
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| 105 | * first and second columns give center of the cell, the third
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| 106 | * gives the size.
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| 107 | * \param flux opened stream to write to
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| 108 | * \return 0 on success, 1 on error
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| 109 | */
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| 110 | int save_leaves(FILE *flux);
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| 111 |
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| 112 | double centre_x; ///< x-position of the centre of the cell
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| 113 | double centre_y; ///< y-position of the centre of the cell
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| 114 | double half_size_x; ///< HALF size of the cell
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| 115 | double half_size_y; ///< HALF size of the cell
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| 116 |
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| 117 | Cmomentum *v; ///< physical contents
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| 118 |
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| 119 | Cquadtree* children[2][2]; ///< sub-cells ( 0,1->left-right; 0,1->bottom,top)
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| 120 | bool has_child; ///< true if not a leaf
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| 121 | };
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| 122 |
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| 123 | }
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| 124 | #endif
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