LSSTApplications  19.0.0-11-g2ce9f25+2,20.0.0+1,20.0.0+11,20.0.0+2,20.0.0+3,20.0.0+4,20.0.0+5,20.0.0+8,20.0.0+9,20.0.0-1-g009f3de,20.0.0-1-g10df615+8,20.0.0-1-g253301a+4,20.0.0-1-g32a200e+8,20.0.0-1-g596936a+9,20.0.0-1-g8a53f90+1,20.0.0-1-gc96f8cb+10,20.0.0-1-gd1c87d7+1,20.0.0-15-g34741e2+3,20.0.0-2-g04cfba9+2,20.0.0-2-gec03fae+2,20.0.0-3-g082faa5+1,20.0.0-3-g2fa8bb8+6,20.0.0-3-gbdbfa727+1,20.0.0-4-gde602ef96+3,20.0.0-4-ge48a6ca+4,20.0.0-8-g1acaa36,20.0.0-8-g7eef53f7+5,w.2020.27
LSSTDataManagementBasePackage
utils.h
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1 /*
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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