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LSST Data Management Base Package
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Angle.h
Go to the documentation of this file.
1/*
2 * This file is part of sphgeom.
3 *
4 * Developed for the LSST Data Management System.
5 * This product includes software developed by the LSST Project
6 * (http://www.lsst.org).
7 * See the COPYRIGHT file at the top-level directory of this distribution
8 * for details of code ownership.
9 *
10 * This software is dual licensed under the GNU General Public License and also
11 * under a 3-clause BSD license. Recipients may choose which of these licenses
12 * to use; please see the files gpl-3.0.txt and/or bsd_license.txt,
13 * respectively. If you choose the GPL option then the following text applies
14 * (but note that there is still no warranty even if you opt for BSD instead):
15 *
16 * This program is free software: you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation, either version 3 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 */
29
30#ifndef LSST_SPHGEOM_ANGLE_H_
31#define LSST_SPHGEOM_ANGLE_H_
32
35
36#include <cmath>
37#include <algorithm>
38#include <iosfwd>
39#include <limits>
40
41#include "constants.h"
42
43
44namespace lsst {
45namespace sphgeom {
46
50class Angle {
51public:
55
56 static Angle fromDegrees(double a) { return Angle(a * RAD_PER_DEG); }
57
58 static Angle fromRadians(double a) { return Angle(a); }
59
61 Angle() : _rad(0.0) {}
62
64 explicit Angle(double a) : _rad(a) {}
65
66 // Comparison operators
67 bool operator==(Angle const & a) const { return _rad == a._rad; }
68 bool operator!=(Angle const & a) const { return _rad != a._rad; }
69 bool operator<(Angle const & a) const { return _rad < a._rad; }
70 bool operator>(Angle const & a) const { return _rad > a._rad; }
71 bool operator<=(Angle const & a) const { return _rad <= a._rad; }
72 bool operator>=(Angle const & a) const { return _rad >= a._rad; }
73
74 // Arithmetic operators
75 Angle operator-() const { return Angle(-_rad); }
76 Angle operator+(Angle const & a) const { return Angle(_rad + a._rad); }
77 Angle operator-(Angle const & a) const { return Angle(_rad - a._rad); }
78 Angle operator*(double a) const { return Angle(_rad * a); }
79 Angle operator/(double a) const { return Angle(_rad / a); }
80 double operator/(Angle const & a) const { return _rad / a._rad; }
81
82 // In-place arithmetic operators
83 Angle & operator+=(Angle const & a) { *this = *this + a; return *this; }
84 Angle & operator-=(Angle const & a) { *this = *this - a; return *this; }
85 Angle & operator*=(double a) { *this = *this * a; return *this; }
86 Angle & operator/=(double a) { *this = *this / a; return *this; }
87
89 double asDegrees() const { return _rad * DEG_PER_RAD; }
90
92 double asRadians() const { return _rad; }
93
95 bool isNormalized() const { return _rad >= 0.0 && _rad <= 2.0 * PI; }
96
98 bool isNan() const { return std::isnan(_rad); }
99
100private:
101 double _rad;
102};
103
104
105inline Angle operator*(double a, Angle const & b) { return b * a; }
106
107std::ostream & operator<<(std::ostream &, Angle const &);
108
109inline double sin(Angle const & a) { return std::sin(a.asRadians()); }
110inline double cos(Angle const & a) { return std::cos(a.asRadians()); }
111inline double tan(Angle const & a) { return std::tan(a.asRadians()); }
112
113inline Angle abs(Angle const & a) { return Angle(std::fabs(a.asRadians())); }
114
115}} // namespace lsst::sphgeom
116
117#endif // LSST_SPHGEOM_ANGLE_H_
table::Key< int > b
table::Key< int > a
Angle represents an angle in radians.
Definition Angle.h:50
static Angle nan()
Definition Angle.h:52
static Angle fromDegrees(double a)
Definition Angle.h:56
bool isNan() const
isNan returns true if the angle value is NaN.
Definition Angle.h:98
bool isNormalized() const
isNormalized returns true if this angle lies in the range [0, 2π).
Definition Angle.h:95
Angle operator*(double a) const
Definition Angle.h:78
Angle & operator/=(double a)
Definition Angle.h:86
Angle operator+(Angle const &a) const
Definition Angle.h:76
bool operator==(Angle const &a) const
Definition Angle.h:67
bool operator<(Angle const &a) const
Definition Angle.h:69
static Angle fromRadians(double a)
Definition Angle.h:58
Angle(double a)
This constructor creates an Angle with the given value in radians.
Definition Angle.h:64
Angle()
This constructor creates an Angle with a value of zero.
Definition Angle.h:61
double asDegrees() const
asDegrees returns the value of this angle in units of degrees.
Definition Angle.h:89
double operator/(Angle const &a) const
Definition Angle.h:80
Angle operator-() const
Definition Angle.h:75
Angle operator/(double a) const
Definition Angle.h:79
bool operator>=(Angle const &a) const
Definition Angle.h:72
Angle operator-(Angle const &a) const
Definition Angle.h:77
Angle & operator-=(Angle const &a)
Definition Angle.h:84
bool operator>(Angle const &a) const
Definition Angle.h:70
bool operator<=(Angle const &a) const
Definition Angle.h:71
Angle & operator+=(Angle const &a)
Definition Angle.h:83
Angle & operator*=(double a)
Definition Angle.h:85
double asRadians() const
asRadians returns the value of this angle in units of radians.
Definition Angle.h:92
bool operator!=(Angle const &a) const
Definition Angle.h:68
T cos(T... args)
T fabs(T... args)
T isnan(T... args)
Angle abs(Angle const &a)
Definition Angle.h:113
constexpr double DEG_PER_RAD
Definition constants.h:46
std::ostream & operator<<(std::ostream &, Angle const &)
Definition Angle.cc:41
double sin(Angle const &a)
Definition Angle.h:109
constexpr double RAD_PER_DEG
Definition constants.h:45
double tan(Angle const &a)
Definition Angle.h:111
double cos(Angle const &a)
Definition Angle.h:110
Angle operator*(double a, Angle const &b)
Definition Angle.h:105
constexpr double PI
Definition constants.h:43
T sin(T... args)
This file contains common constants.
T tan(T... args)