/usr/include/CGAL/Hyperbola_segment_2.h is in libcgal-dev 4.2-5ubuntu1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | // Copyright (c) 2003,2004 INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// 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 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
//
// Author(s) : Menelaos Karavelas <mkaravel@iacm.forth.gr>
#ifndef CGAL_HYPERBOLA_SEGMENT_2_H
#define CGAL_HYPERBOLA_SEGMENT_2_H
#include <CGAL/Hyperbola_2.h>
namespace CGAL {
template < class Gt >
class Hyperbola_segment_2 : public Hyperbola_2< Gt >
{
public:
typedef CGAL::Hyperbola_2<Gt> Base;
typedef typename Base::Site_2 Site_2;
typedef typename Base::Point_2 Point_2;
typedef typename Base::Segment_2 Segment_2;
typedef typename Base::FT FT;
using Base::t;
using Base::f;
#if 0
typedef CGAL::Hyperbola_2<Point,Weight> Base;
typedef typename Base::Weighted_point Weighted_point;
#endif
// typedef typename R::RT FT;
// typedef double FT;
// typedef CGAL::Point_2< Cartesian<double> > Point_2;
// typedef CGAL::Segment_2< Cartesian<double> > Segment_2;
protected:
Point_2 p1, p2;
template< class Stream >
inline
void draw_line(Stream &W) const
{
#if 0
FT s[2];
s[0] = t(p1);
s[1] = t(p2);
Point_2 p[2];
for (int i = 0; i < 2; i++) p[i] = f(s[i]);
W << Segment_2(p[0], p[1]);
#else
W << Segment_2(p1, p2);
#endif
}
inline
Point_2 midpoint() const
{
return Hyperbola_2< Gt >::midpoint(p1, p2);
}
public:
Hyperbola_segment_2() : Hyperbola_2< Gt >() {}
Hyperbola_segment_2(const Site_2 &f1, const Site_2 &f2,
const Point_2 &p1, const Point_2 &p2)
: Hyperbola_2< Gt >(f1, f2)
{
this->p1 = p1;
this->p2 = p2;
}
void generate_points(std::vector<Point_2>& p) const
{
if ( CGAL::is_zero(this->r) ) {
p.push_back(p1);
p.push_back(p2);
return;
}
// FT STEP = W.width() / 100.0;
FT s0, s1;
s0 = t(p1);
s1 = t(p2);
if (CGAL::compare(s0, s1) == LARGER) {
std::swap(s0, s1);
}
p.clear();
if ( !(CGAL::is_positive(s0)) &&
!(CGAL::is_negative(s1)) ) {
FT tt;
int k;
p.push_back( this->o );
k = 1;
tt = FT(-this->STEP);
while ( CGAL::compare(tt, s0) == LARGER ) {
p.insert( p.begin(), f(tt) );
k--;
tt = -FT(k * k) * this->STEP;
}
p.insert( p.begin(), f(s0) );
k = 1;
tt = FT(this->STEP);
while ( CGAL::compare(tt, s1) == SMALLER ) {
p.push_back( f(tt) );
k++;
tt = FT(k * k) * this->STEP;
}
p.push_back( f(s1) );
} else if ( !(CGAL::is_negative(s0)) &&
!(CGAL::is_negative(s1)) ) {
FT tt;
int k;
p.push_back( f(s0) );
tt = s0;
k = int(CGAL::to_double(CGAL::sqrt(tt / this->STEP)));
while ( CGAL::compare(tt, s1) == SMALLER ) {
if ( CGAL::compare(tt, s0) != SMALLER )
p.push_back( f(tt) );
k++;
tt = FT(k * k) * this->STEP;
}
p.push_back( f(s1) );
} else {
FT tt;
int k;
p.push_back( f(s1) );
tt = s1;
k = int(CGAL::to_double(-CGAL::sqrt(-tt / this->STEP)));
while ( CGAL::compare(tt, s0) == LARGER ) {
if ( CGAL::compare(tt, s1) != LARGER )
p.push_back( f(tt) );
k--;
tt = -FT(k * k) * this->STEP;
}
p.push_back( f(s0) );
}
}
template< class Stream >
void draw(Stream &W) const
{
std::vector<Point_2> p;
generate_points(p);
for (unsigned int i = 0; i < p.size() - 1; i++) {
W << Segment_2(p[i], p[i+1]);
}
}
};
template< class Stream, class Gt >
inline
Stream& operator<<(Stream &s, const Hyperbola_segment_2<Gt>& H)
{
H.draw(s);
return s;
}
} //namespace CGAL
#endif // CGAL_HYPERBOLA_SEGMENT_2_H
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