lsst::afw::geom::ellipses::PixelRegion Class Reference

#include <PixelRegion.h>

Classes
class	Iterator

Public Member Functions
Iterator	begin () const
Iterator	end () const
lsst::geom::Box2I const &	getBBox () const
Span const	getSpanAt (int y) const
	PixelRegion (Ellipse const &ellipse)
	PixelRegion (PixelRegion const &)=default
	PixelRegion (PixelRegion &&)=default
PixelRegion &	operator= (PixelRegion const &)=default
PixelRegion &	operator= (PixelRegion &&)=default
	~PixelRegion ()=default

Detailed Description

Definition at line 38 of file PixelRegion.h.

Constructor & Destructor Documentation

PixelRegion() [1/3]

lsst::afw::geom::ellipses::PixelRegion::PixelRegion ( Ellipse const &  ellipse )

explicit

Definition at line 33 of file PixelRegion.cc.

        : _center(ellipse.getCenter()), _bbox(ellipse.computeBBox(), lsst::geom::Box2I::EXPAND) {
    Quadrupole::Matrix q = Quadrupole(ellipse.getCore()).getMatrix();
    _detQ = q(0, 0) * q(1, 1) - q(0, 1) * q(0, 1);
    _invQxx = q(1, 1) / _detQ;
    _alpha = q(0, 1) / _detQ / _invQxx;  // == -invQxy / invQxx
    if (std::isnan(_alpha)) {
        _alpha = 0.0;
    }
}

PixelRegion() [2/3]

lsst::afw::geom::ellipses::PixelRegion::PixelRegion ( PixelRegion const &  )

default

PixelRegion() [3/3]

lsst::afw::geom::ellipses::PixelRegion::PixelRegion ( PixelRegion &&  )

default

~PixelRegion()

lsst::afw::geom::ellipses::PixelRegion::~PixelRegion ( )

default

Member Function Documentation

begin()

PixelRegion::Iterator lsst::afw::geom::ellipses::PixelRegion::begin ( ) const

inline

Definition at line 96 of file PixelRegion.h.

                                                    {
    return Iterator(getSpanAt(_bbox.getBeginY()), this);
}

end()

PixelRegion::Iterator lsst::afw::geom::ellipses::PixelRegion::end ( ) const

inline

Definition at line 99 of file PixelRegion.h.

{ return Iterator(getSpanAt(_bbox.getEndY()), this); }

getBBox()

lsst::geom::Box2I const& lsst::afw::geom::ellipses::PixelRegion::getBBox ( ) const

inline

Definition at line 45 of file PixelRegion.h.

{ return _bbox; }

getSpanAt()

Span const lsst::afw::geom::ellipses::PixelRegion::getSpanAt

(

int

y

)

const

Definition at line 44 of file PixelRegion.cc.

                                             {
    double yt = y - _center.getY();
    double d = _invQxx - yt * yt / _detQ;
    double x0 = _center.getX() + yt * _alpha;
    double x1 = x0;
    if (d > 0.0) {
        d = std::sqrt(d) / _invQxx;
        x0 -= d;
        x1 += d;
    }  // Note that we return an empty span when d <= 0.0 or d is NaN.
    return Span(y, std::ceil(x0), std::floor(x1));
}

operator=() [1/2]

PixelRegion& lsst::afw::geom::ellipses::PixelRegion::operator= ( PixelRegion const &  )

default

operator=() [2/2]

PixelRegion& lsst::afw::geom::ellipses::PixelRegion::operator= ( PixelRegion &&  )

default

---

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

• /j/snowflake/release/lsstsw/stack/Linux64/afw/18.1.0/include/lsst/afw/geom/ellipses/PixelRegion.h
• /j/snowflake/release/lsstsw/stack/Linux64/afw/18.1.0/src/geom/ellipses/PixelRegion.cc