[1] | 1 | /////////////////////////////////////////////////////////////////////////////// |
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| 2 | // File: geom_2d.cpp // |
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| 3 | // Description: source file for two-dimensional geometry tools // |
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| 4 | // This file is part of the SISCone project. // |
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| 5 | // For more details, see http://projects.hepforge.org/siscone // |
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| 6 | // // |
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| 7 | // Copyright (c) 2006 Gavin Salam and Gregory Soyez // |
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| 8 | // // |
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| 9 | // This program is free software; you can redistribute it and/or modify // |
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| 10 | // it under the terms of the GNU General Public License as published by // |
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| 11 | // the Free Software Foundation; either version 2 of the License, or // |
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| 12 | // (at your option) any later version. // |
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| 13 | // // |
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| 14 | // This program is distributed in the hope that it will be useful, // |
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| 15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of // |
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| 16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // |
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| 17 | // GNU General Public License for more details. // |
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| 18 | // // |
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| 19 | // You should have received a copy of the GNU General Public License // |
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| 20 | // along with this program; if not, write to the Free Software // |
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| 21 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA // |
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| 22 | // // |
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| 23 | // $Revision:: 859 $// |
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| 24 | // $Date:: 2012-11-28 02:49:23 +0100 (Wed, 28 Nov 2012) $// |
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| 25 | /////////////////////////////////////////////////////////////////////////////// |
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| 26 | |
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| 27 | #include "geom_2d.h" |
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| 28 | #include <algorithm> |
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| 29 | |
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| 30 | namespace siscone{ |
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| 31 | |
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| 32 | #define PHI_RANGE_MASK 0xFFFFFFFF |
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| 33 | |
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| 34 | /********************************************************* |
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| 35 | * class Ceta_phi_range implementation * |
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| 36 | * class for holding a covering range in eta-phi * |
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| 37 | * * |
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| 38 | * This class deals with ranges in the eta-phi plane. It * |
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| 39 | * implements methods to test if two ranges overlap and * |
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| 40 | * to take the union of two overlapping intervals. * |
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| 41 | *********************************************************/ |
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| 42 | |
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| 43 | using namespace std; |
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| 44 | |
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| 45 | // static member default init |
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| 46 | //---------------------------- |
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| 47 | double Ceta_phi_range::eta_min = -100.0; |
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| 48 | double Ceta_phi_range::eta_max = 100.0; |
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| 49 | |
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| 50 | // default ctor |
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| 51 | //-------------- |
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| 52 | Ceta_phi_range::Ceta_phi_range(){ |
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| 53 | eta_range = 0; |
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| 54 | phi_range = 0; |
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| 55 | } |
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| 56 | |
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| 57 | // ctor with initialisation |
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| 58 | // we initialise with a centre (in eta,phi) and a radius |
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| 59 | // - c_eta eta coordinate of the centre |
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| 60 | // - c_phi phi coordinate of the centre |
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| 61 | // - R radius |
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| 62 | //------------------------------------------------------- |
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| 63 | Ceta_phi_range::Ceta_phi_range(double c_eta, double c_phi, double R){ |
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| 64 | // determination of the eta range |
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| 65 | //------------------------------- |
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| 66 | double xmin = max(c_eta-R,eta_min+0.0001); |
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| 67 | double xmax = min(c_eta+R,eta_max-0.0001); |
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| 68 | |
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| 69 | unsigned int cell_min = get_eta_cell(xmin); |
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| 70 | unsigned int cell_max = get_eta_cell(xmax); |
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| 71 | |
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| 72 | // warning: if cell_max==2^31, 2*cell_max==0 hence, |
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| 73 | // even if the next formula is formally (2*cell_max-cell_min), |
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| 74 | // expressing it as (cell_max-cell_min)+cell_max is safe. |
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| 75 | eta_range = (cell_max-cell_min)+cell_max; |
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| 76 | |
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| 77 | // determination of the phi range |
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| 78 | // !! taking care of periodicity !! |
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| 79 | //--------------------------------- |
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| 80 | xmin = phi_in_range(c_phi-R); |
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| 81 | xmax = phi_in_range(c_phi+R); |
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| 82 | |
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| 83 | cell_min = get_phi_cell(xmin); |
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| 84 | cell_max = get_phi_cell(xmax); |
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| 85 | |
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| 86 | // Also, if the interval goes through pi, inversion is needed |
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| 87 | if (xmax>xmin) |
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| 88 | phi_range = (cell_max-cell_min)+cell_max; |
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| 89 | else { |
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| 90 | phi_range = (cell_min==cell_max) |
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| 91 | ? PHI_RANGE_MASK |
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| 92 | : ((PHI_RANGE_MASK^(cell_min-cell_max)) + cell_max); |
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| 93 | } |
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| 94 | } |
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| 95 | |
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| 96 | // assignment of range |
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| 97 | // - r range to assign to current one |
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| 98 | //--------------------------------------- |
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| 99 | Ceta_phi_range& Ceta_phi_range::operator = (const Ceta_phi_range &r){ |
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| 100 | eta_range = r.eta_range; |
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| 101 | phi_range = r.phi_range; |
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| 102 | |
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| 103 | return *this; |
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| 104 | } |
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| 105 | |
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| 106 | // add a particle to the range |
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| 107 | // - eta eta coordinate of the particle |
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| 108 | // - phi phi coordinate of the particle |
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| 109 | // \return 0 on success, 1 on error |
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| 110 | //---------------------------------------- |
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| 111 | int Ceta_phi_range::add_particle(const double eta, const double phi){ |
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| 112 | // deal with the eta coordinate |
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| 113 | eta_range |= get_eta_cell(eta); |
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| 114 | |
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| 115 | // deal with the phi coordinate |
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| 116 | phi_range |= get_phi_cell(phi); |
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| 117 | |
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| 118 | return 0; |
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| 119 | } |
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| 120 | |
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| 121 | |
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| 122 | // test overlap |
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| 123 | // - r1 first range |
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| 124 | // - r2 second range |
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| 125 | // return true if overlap, false otherwise. |
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| 126 | //------------------------------------------ |
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| 127 | bool is_range_overlap(const Ceta_phi_range &r1, const Ceta_phi_range &r2){ |
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| 128 | // check overlap in eta AND phi |
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| 129 | return ((r1.eta_range & r2.eta_range) && (r1.phi_range & r2.phi_range)); |
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| 130 | } |
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| 131 | |
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| 132 | // compute union |
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| 133 | // Note: we assume that the two intervals overlap |
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| 134 | // - r1 first range |
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| 135 | // - r2 second range |
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| 136 | // \return union of the two ranges |
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| 137 | //------------------------------------------ |
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| 138 | const Ceta_phi_range range_union (const Ceta_phi_range &r1, const Ceta_phi_range &r2){ |
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| 139 | Ceta_phi_range tmp; |
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| 140 | |
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| 141 | // compute union in eta |
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| 142 | tmp.eta_range = r1.eta_range | r2.eta_range; |
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| 143 | |
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| 144 | // compute union in phi |
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| 145 | tmp.phi_range = r1.phi_range | r2.phi_range; |
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| 146 | |
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| 147 | return tmp; |
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| 148 | } |
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| 149 | |
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| 150 | } |
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