This file is indexed.

/usr/include/siscone/geom_2d.h is in libsiscone-dev 2.0.6-1.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
// -*- C++ -*-
///////////////////////////////////////////////////////////////////////////////
// File: geom_2d.h                                                           //
// Description: header file for two-dimensional geometry tools               //
// This file is part of the SISCone project.                                 //
// For more details, see http://projects.hepforge.org/siscone                //
//                                                                           //
// Copyright (c) 2006 Gavin Salam and Gregory Soyez                          //
//                                                                           //
// This program is free software; you can redistribute it and/or modify      //
// it under the terms of the GNU General Public License as published by      //
// the Free Software Foundation; either version 2 of the License, or         //
// (at your option) any later version.                                       //
//                                                                           //
// This program is distributed in the hope that it will be useful,           //
// but WITHOUT ANY WARRANTY; without even the implied warranty of            //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             //
// GNU General Public License for more details.                              //
//                                                                           //
// You should have received a copy of the GNU General Public License         //
// along with this program; if not, write to the Free Software               //
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
//                                                                           //
// $Revision:: 268                                                          $//
// $Date:: 2009-03-12 21:24:16 +0100 (Thu, 12 Mar 2009)                     $//
///////////////////////////////////////////////////////////////////////////////

#ifndef __GEOM_2D_H__
#define __GEOM_2D_H__

#include <iostream>
#include <math.h>
#include "defines.h"

#ifndef M_PI
#define M_PI 3.141592653589793238462643383279502884197
#endif

namespace siscone{

/// return a result that corresponds to phi, but in the
/// range (-pi..pi]; the result is only correct if -3pi < phi <= 3pi
inline double phi_in_range(double phi) {
  if      (phi <= -M_PI) phi += twopi;
  else if (phi >   M_PI) phi -= twopi;
  return phi;
}

/// return the difference between the two phi values, 
/// placed in the correct range (-pi..pi], , assuming that phi1,phi2
/// are already in the correct range.
inline double dphi(double phi1, double phi2) {
  return phi_in_range(phi1-phi2);
}


/// return the absolute difference between the two phi values, 
/// placed in the correct range, assuming that phi1,phi2 are already
/// in the correct range.
inline double abs_dphi(double phi1, double phi2) {
  double delta = fabs(phi1-phi2);
  return delta > M_PI ? twopi-delta : delta;
}

/// return the square of the argument
inline double pow2(double x) {return x*x;}


/** 
 * \class Ctwovect
 * \brief class for holding a two-vector
 */
class Ctwovect {
public:
  /// default ctor
  Ctwovect() : x(0.0), y(0.0) {}

  /// ctor with initialisation
  /// \param _x   first coordinate
  /// \param _y   second coordinate
  Ctwovect(double _x, double _y) : x(_x), y(_y) {}

  /// vector coordinates
  double x, y;

  /// norm (modulud square) of the vector
  inline double mod2() const {return pow2(x)+pow2(y);}

  /// modulus of the vector
  inline double modulus() const {return sqrt(mod2());}
};


/// dot product of two 2-vectors
/// \param a   first 2-vect
/// \param b   second 2-vect
/// \return a.b is returned
inline double dot_product(const Ctwovect & a, const Ctwovect & b) {
  return a.x*b.x + a.y*b.y;
}


/// cross product of two 2-vectors
/// \param a   first 2-vect
/// \param b   second 2-vect
/// \return a x b is returned
inline double cross_product(const Ctwovect & a, const Ctwovect & b) {
  return a.x*b.y - a.y*b.x;
}


/** 
 * \class Ceta_phi_range
 * \brief class for holding a covering range in eta-phi
 *
 * This class deals with ranges in the eta-phi plane. It
 * implements methods to test if two ranges overlap and
 * to take the union of two overlapping intervals.
 */
class Ceta_phi_range{
public:
  /// default ctor
  Ceta_phi_range();

  /// ctor with initialisation
  /// we initialise with a centre (in eta,phi) and a radius
  /// \param c_eta   eta coordinate of the centre
  /// \param c_phi   phi coordinate of the centre
  /// \param R       radius
  Ceta_phi_range(double c_eta, double c_phi, double R);

  /// assignment of range
  /// \param r   range to assign to current one
  Ceta_phi_range& operator = (const Ceta_phi_range &r);

  /// add a particle to the range
  /// \param eta  eta coordinate of the particle
  /// \param phi  phi coordinate of the particle
  /// \return 0 on success, 1 on error
  int add_particle(const double eta, const double phi);

  /// eta range as a binary coding of covered cells
  unsigned int eta_range;     

  /// phi range as a binary coding of covered cells
  unsigned int phi_range;     

  // extremal value for eta
  static double eta_min;  ///< minimal value for eta
  static double eta_max;  ///< maximal value for eta

private:
  /// return the cell index corrsponding to an eta value
  inline unsigned int get_eta_cell(double eta){
    return (unsigned int) (1 << ((int) (32*((eta-eta_min)/(eta_max-eta_min)))));
  }

  /// return the cell index corrsponding to a phi value
  inline unsigned int get_phi_cell(double phi){
    return (unsigned int) (1 << ((int) (32*phi/twopi+16)%32));
  }
};

/// test overlap
/// \param  r1  first range
/// \param  r2  second range
/// \return true if overlap, false otherwise.
bool is_range_overlap(const Ceta_phi_range &r1, const Ceta_phi_range &r2);

/// compute union
/// Note: we assume that the two intervals overlap
/// \param  r1  first range
/// \param  r2  second range
/// \return union of the two ranges
const Ceta_phi_range range_union(const Ceta_phi_range &r1, const Ceta_phi_range &r2);

}

#endif