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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