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LSST Data Management Base Package
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Public Member Functions | List of all members
lsst::afw::geom::ellipses::EllipseHorizontalLineIntersection Class Reference

Public Member Functions

 EllipseHorizontalLineIntersection (Ellipse const &ellipse)
 
boost::optional< std::pair< double, double > > xAt (double y) const
 

Detailed Description

Definition at line 62 of file PixelRegion.cc.

Constructor & Destructor Documentation

◆ EllipseHorizontalLineIntersection()

lsst::afw::geom::ellipses::EllipseHorizontalLineIntersection::EllipseHorizontalLineIntersection ( Ellipse const & ellipse)
inlineexplicit

Definition at line 65 of file PixelRegion.cc.

65 :
66 _center(ellipse.getCenter()),
67 _p(0.0), _t(0.0), _r(0.0)
68 {
69 Quadrupole converted(ellipse.getCore());
70 converted.normalize();
71 auto q = converted.getMatrix();
72 if (q(1, 1) < q(0, 0)*std::numeric_limits<double>::epsilon()) {
73 _r = q(0, 0);
74 } else {
75 _p = q(0, 1)/q(1, 1);
76 _r = q(0, 0) - q(0, 1)*_p;
77 _t = _r/q(1, 1);
78 }
79 }

Member Function Documentation

◆ xAt()

boost::optional< std::pair< double, double > > lsst::afw::geom::ellipses::EllipseHorizontalLineIntersection::xAt ( double y) const
inline

Definition at line 81 of file PixelRegion.cc.

81 {
82 double yc = y - _center.getY();
83 double xc = _p*yc + _center.getX();
84 double s = _r - _t*yc*yc;
85 if (s < 0) {
86 return boost::none;
87 } else {
88 double d = std::sqrt(s);
89 return std::make_pair(xc - d, xc + d);
90 }
91 }
int y
Definition SpanSet.cc:48
T make_pair(T... args)
T sqrt(T... args)

The documentation for this class was generated from the following file: