LSSTApplications  19.0.0-14-gb0260a2+9346bf5579,20.0.0+34a42eae2c,20.0.0+4d97b31663,20.0.0+5a87225079,20.0.0+8558dd3f48,20.0.0+9180b0bcc6,20.0.0+b290a576ab,20.0.0+b2ea66fa67,20.0.0+bba7c37fb9,20.0.0+cd847060a9,20.0.0+d138450326,20.0.0+d8493377e7,20.0.0+dcf29472a8,20.0.0+ef162136e0,20.0.0+f45b7d88f4,20.0.0-1-g10df615+6305e2b088,20.0.0-1-g253301a+dcf29472a8,20.0.0-1-g498fb60+ff88705a28,20.0.0-1-g4d801e7+d83096fe1b,20.0.0-1-g8a53f90+2817c06967,20.0.0-1-gc96f8cb+bba7c37fb9,20.0.0-1-gd1c87d7+2817c06967,20.0.0-1-gdb27ee5+52b05b0b7e,20.0.0-12-ga81c59a+61094d0bf4,20.0.0-18-g08fba245+aea2d85f7a,20.0.0-2-gec03fae+3bc057fb2a,20.0.0-28-gb33ccd1+1ae6d82017,20.0.0-3-gd2e950e+f45b7d88f4,20.0.0-3-gdd5c15c+990b4320db,20.0.0-4-g4a2362f+f45b7d88f4,20.0.0-5-gac0d578b1+6c871ee35c,20.0.0-5-gfcebe35+988ee452db,20.0.0-6-g01203fff+883dccf1c0,20.0.0-7-g3c4151b+a8ac49de8d,20.0.0-8-gc2abeef+bba7c37fb9,20.0.0-9-gabd0d4c+52b05b0b7e,w.2020.33
LSSTDataManagementBasePackage
utils.h
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1 /*
2  * LSST Data Management System
3  * Copyright 2014-2015 AURA/LSST.
4  *
5  * This product includes software developed by the
6  * LSST Project (http://www.lsst.org/).
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22 
23 #ifndef LSST_SPHGEOM_UTILS_H_
24 #define LSST_SPHGEOM_UTILS_H_
25 
28 
29 #include "Angle.h"
30 
31 
32 namespace lsst {
33 namespace sphgeom {
34 
35 // Forward declarations
36 class Vector3d;
37 class UnitVector3d;
38 
45 double getMinSquaredChordLength(Vector3d const & v,
46  Vector3d const & a,
47  Vector3d const & b,
48  Vector3d const & n);
49 
55 double getMaxSquaredChordLength(Vector3d const & v,
56  Vector3d const & a,
57  Vector3d const & b,
58  Vector3d const & n);
59 
63  return abs(x - c);
64 }
65 
70  if (abs(x) <= abs(c)) {
71  return a + Angle(PI) - 2.0 * abs(c);
72  }
73  if (a < abs(x)) {
74  return Angle(PI) - 2.0 * abs(c) - a;
75  }
76  return Angle(PI) + 2.0 * abs(c) - a;
77 }
78 
82 Vector3d getWeightedCentroid(UnitVector3d const & v0,
83  UnitVector3d const & v1,
84  UnitVector3d const & v2);
85 
86 }} // namespace lsst::sphgeom
87 
88 #endif // LSST_SPHGEOM_UTILS_H_
lsst::sphgeom::PI
constexpr double PI
Definition: constants.h:36
lsst::sphgeom::abs
Angle abs(Angle const &a)
Definition: Angle.h:106
Angle.h
This file declares a class for representing angles.
lsst::afw::table::Angle
lsst::geom::Angle Angle
Definition: misc.h:33
x
double x
Definition: ChebyshevBoundedField.cc:277
lsst::sphgeom::getMinAngleToCircle
Angle getMinAngleToCircle(Angle x, Angle c)
getMinAngleToCircle returns the minimum angular separation between a point at latitude x and the poin...
Definition: utils.h:62
lsst::sphgeom::getMaxSquaredChordLength
double getMaxSquaredChordLength(Vector3d const &v, Vector3d const &a, Vector3d const &b, Vector3d const &n)
Let p be the unit vector furthest from v that lies on the plane with normal n in the direction of the...
Definition: utils.cc:58
b
table::Key< int > b
Definition: TransmissionCurve.cc:467
lsst
A base class for image defects.
Definition: imageAlgorithm.dox:1
lsst::sphgeom::getMaxAngleToCircle
Angle getMaxAngleToCircle(Angle x, Angle c)
getMaxAngleToCircle returns the maximum angular separation between a point at latitude x and the poin...
Definition: utils.h:68
a
table::Key< int > a
Definition: TransmissionCurve.cc:466
lsst::sphgeom::Angle
Angle represents an angle in radians.
Definition: Angle.h:43
lsst::sphgeom::getMinSquaredChordLength
double getMinSquaredChordLength(Vector3d const &v, Vector3d const &a, Vector3d const &b, Vector3d const &n)
Let p be the unit vector closest to v that lies on the plane with normal n in the direction of the cr...
Definition: utils.cc:36
lsst::sphgeom::getWeightedCentroid
Vector3d getWeightedCentroid(UnitVector3d const &v0, UnitVector3d const &v1, UnitVector3d const &v2)
getWeightedCentroid returns the center of mass of the given spherical triangle (assuming a uniform ma...
Definition: utils.cc:79