Class AstrometryTransformLinear

• Defined in File AstrometryTransform.h

Inheritance Relationships

Base Type

• public lsst::jointcal::AstrometryTransformPolynomial (Class AstrometryTransformPolynomial)

Derived Types

• public lsst::jointcal::AstrometryTransformLinearRot (Class AstrometryTransformLinearRot)

• public lsst::jointcal::AstrometryTransformLinearScale (Class AstrometryTransformLinearScale)

• public lsst::jointcal::AstrometryTransformLinearShift (Class AstrometryTransformLinearShift)

Class Documentation

class AstrometryTransformLinear : public lsst::jointcal::AstrometryTransformPolynomial

implements the linear transformations (6 real coefficients).

Subclassed by lsst::jointcal::AstrometryTransformLinearRot, lsst::jointcal::AstrometryTransformLinearScale, lsst::jointcal::AstrometryTransformLinearShift

Public Functions

AstrometryTransformLinear()

the default constructor constructs the do-nothing transformation.

AstrometryTransformLinear(AstrometryTransformPolynomial const &transform)

This triggers an exception if P.getOrder() != 1.

AstrometryTransformLinear operator*(AstrometryTransformLinear const &right) const

enables to combine linear tranformations: T1=T2*T3 is legal.

AstrometryTransformLinear inverted() const

returns the inverse: T1 = T2.inverted();

void computeDerivative(Point const &where, AstrometryTransformLinear &derivative, const double step = 0.01) const

specialised analytic routine

AstrometryTransformLinear linearApproximation(Point const &where, const double step = 0.01) const

linear (local) approximation.

AstrometryTransformLinear(const double ox, const double oy, const double aa11, const double aa12, const double aa21, const double aa22)

Construct a AstrometryTransformLinear from parameters.

AstrometryTransformLinear(AstrometryTransformIdentity const&)

Handy converter:

std::unique_ptr<AstrometryTransform> clone() const

returns a copy (allocated by new) of the transformation.

std::unique_ptr<AstrometryTransform> inverseTransform(const double precision, const Frame &region) const

returns an inverse transform. Numerical if not overloaded.

precision and region refer to the “input” side of this, and hence to the output side of the returned AstrometryTransform.

double A11() const

double A12() const

double A21() const

double A22() const

double Dx() const

double Dy() const

Protected Functions

double &a11()

double &a12()

double &a21()

double &a22()

double &dx()

double &dy()

Friends

friend lsst::jointcal::AstrometryTransformLinear::AstrometryTransform

friend lsst::jointcal::AstrometryTransformLinear::AstrometryTransformIdentity

friend lsst::jointcal::AstrometryTransformLinear::AstrometryTransformPolynomial