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
|
// Copyright (c) 1999 Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel). 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 Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// 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: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.2-branch/Kernel_23/include/CGAL/Direction_2.h $
// $Id: Direction_2.h 28567 2006-02-16 14:30:13Z lsaboret $
//
//
// Author(s) : Stefan Schirra
#ifndef CGAL_DIRECTION_2_H
#define CGAL_DIRECTION_2_H
CGAL_BEGIN_NAMESPACE
template <class R_>
class Direction_2 : public R_::Kernel_base::Direction_2
{
typedef typename R_::RT RT;
typedef typename R_::Vector_2 Vector_2;
typedef typename R_::Line_2 Line_2;
typedef typename R_::Ray_2 Ray_2;
typedef typename R_::Segment_2 Segment_2;
typedef typename R_::Kernel_base::Direction_2 RDirection_2;
public:
typedef RDirection_2 Rep;
const Rep& rep() const
{
return *this;
}
Rep& rep()
{
return *this;
}
typedef R_ R;
Direction_2() {}
Direction_2(const RDirection_2& d)
: RDirection_2(d) {}
Direction_2(const Vector_2& v)
: RDirection_2(typename R::Construct_direction_2()(v).rep()) {}
Direction_2(const Line_2& l)
: RDirection_2(typename R::Construct_direction_2()(l).rep()) {}
Direction_2(const Ray_2& r)
: RDirection_2(typename R::Construct_direction_2()(r).rep()) {}
Direction_2(const Segment_2& s)
: RDirection_2(typename R::Construct_direction_2()(s).rep()) {}
Direction_2(const RT &x, const RT &y)
: RDirection_2(typename R::Construct_direction_2()(x,y).rep()) {}
bool
counterclockwise_in_between(const Direction_2 &d1,
const Direction_2 &d2) const
{
return R().counterclockwise_in_between_2_object()(*this, d1, d2);
}
Direction_2 perpendicular(const Orientation &o) const
{
return R().construct_perpendicular_direction_2_object()(*this,o);
}
typename Qualified_result_of<typename R::Compute_dx_2, Direction_2>::type
dx() const
{
return R().compute_dx_2_object()(*this);
}
typename Qualified_result_of<typename R::Compute_dy_2, Direction_2>::type
dy() const
{
return R().compute_dy_2_object()(*this);
}
typename Qualified_result_of<typename R::Compute_dx_2, Direction_2>::type
delta(int i) const
{
CGAL_kernel_precondition( ( i == 0 ) || ( i == 1 ) );
return (i==0) ? dx() : dy();
}
bool
operator<(const Direction_2 &d) const
{
return R().compare_angle_with_x_axis_2_object()(*this, d) == SMALLER;
}
bool
operator>(const Direction_2 &d) const
{
return d < *this;
}
bool
operator>=(const Direction_2 &d) const
{
return R().compare_angle_with_x_axis_2_object()(*this, d) != SMALLER;
}
bool
operator<=(const Direction_2 &d) const
{
return R().compare_angle_with_x_axis_2_object()(*this, d) != LARGER;
}
Direction_2
operator-() const
{
return Direction_2(-dx(), -dy());
}
Vector_2 vector() const
{
return R().construct_vector_2_object()(*this);
}
bool
operator==(const Direction_2& d) const
{
return R().equal_2_object()(*this, d);
}
bool
operator!=(const Direction_2& d) const
{
return !(*this == d);
}
};
#ifndef CGAL_NO_OSTREAM_INSERT_DIRECTION_2
template < class R >
std::ostream &
operator<<(std::ostream &os, const Direction_2<R> &d)
{
return os << d.rep();
}
#endif // CGAL_NO_OSTREAM_INSERT_DIRECTION_2
#ifndef CGAL_NO_ISTREAM_EXTRACT_DIRECTION_2
template < class R >
std::istream &
operator>>(std::istream &is, Direction_2<R> &d)
{
return is >> d.rep();
}
#endif // CGAL_NO_ISTREAM_EXTRACT_DIRECTION_2
CGAL_END_NAMESPACE
#endif // CGAL_DIRECTION_2_H
|
