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LSST Data Management Base Package
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Public Types | Public Member Functions | Public Attributes | List of all members
lsst::afw::geom::ellipses::BaseCore::Transformer Class Referencefinal

A temporary-only expression object for ellipse core transformations. More...

#include <Transformer.h>

Public Types

using DerivativeMatrix = Eigen::Matrix3d
 Matrix type for derivative with respect to input ellipse parameters.
 
using TransformDerivativeMatrix = Eigen::Matrix<double, 3, 4>
 Matrix type for derivative with respect to transform parameters.
 

Public Member Functions

 Transformer (BaseCore &input_, lsst::geom::LinearTransform const &transform_)
 Standard constructor.
 
std::shared_ptr< BaseCore > copy () const
 Return a new transformed ellipse core.
 
void inPlace ()
 Transform the ellipse core in-place.
 
void apply (BaseCore &result) const
 
DerivativeMatrix d () const
 Return the derivative of transformed core with respect to input core.
 
TransformDerivativeMatrix dTransform () const
 Return the derivative of transformed core with respect to transform parameters.
 

Public Attributes

BaseCore & input
 input core to be transformed
 
lsst::geom::LinearTransform const & transform
 transform object
 

Detailed Description

A temporary-only expression object for ellipse core transformations.

Transformer simply provides a clean syntax for transform-related operations, including in-place and new-object transformations, derivatives of the transformations, and implicit conversion to a shared_ptr to a new transformed core.

Definition at line 49 of file Transformer.h.

Member Typedef Documentation

◆ DerivativeMatrix

using lsst::afw::geom::ellipses::BaseCore::Transformer::DerivativeMatrix = Eigen::Matrix3d

Matrix type for derivative with respect to input ellipse parameters.

Definition at line 52 of file Transformer.h.

◆ TransformDerivativeMatrix

using lsst::afw::geom::ellipses::BaseCore::Transformer::TransformDerivativeMatrix = Eigen::Matrix<double, 3, 4>

Matrix type for derivative with respect to transform parameters.

Definition at line 55 of file Transformer.h.

Constructor & Destructor Documentation

◆ Transformer()

lsst::afw::geom::ellipses::BaseCore::Transformer::Transformer ( BaseCore & input_,
lsst::geom::LinearTransform const & transform_ )
inline

Standard constructor.

Definition at line 58 of file Transformer.h.

59 : input(input_), transform(transform_) {}
lsst::afw::geom::ellipses::BaseCore::Transformer::transform
lsst::geom::LinearTransform const & transform
transform object
Definition Transformer.h:76
lsst::afw::geom::ellipses::BaseCore::Transformer::input
BaseCore & input
input core to be transformed
Definition Transformer.h:75

Member Function Documentation

◆ apply()

void lsst::afw::geom::ellipses::BaseCore::Transformer::apply ( BaseCore & result) const

Definition at line 41 of file Transformer.cc.

41 {
42 Eigen::Matrix2d m;
43 input._assignToQuadrupole(m(0, 0), m(1, 1), m(0, 1));
44 m(1, 0) = m(0, 1);
45 m = transform.getMatrix() * m * transform.getMatrix().transpose();
46 result._assignFromQuadrupole(m(0, 0), m(1, 1), m(0, 1));
47}
result
py::object result
Definition _schema.cc:429
m
int m
Definition SpanSet.cc:48
lsst::geom::LinearTransform::getMatrix
Matrix const & getMatrix() const noexcept
Definition LinearTransform.h:151

◆ copy()

std::shared_ptr< BaseCore > lsst::afw::geom::ellipses::BaseCore::Transformer::copy ( ) const

Return a new transformed ellipse core.

Definition at line 33 of file Transformer.cc.

33 {
34 std::shared_ptr<BaseCore> r(input.clone());
35 apply(*r);
36 return r;
37}
lsst.pipe.tasks.prettyPictureMaker._task.r
r
Definition _task.py:100

◆ d()

BaseCore::Transformer::DerivativeMatrix lsst::afw::geom::ellipses::BaseCore::Transformer::d ( ) const

Return the derivative of transformed core with respect to input core.

Definition at line 49 of file Transformer.cc.

49 {
50 std::shared_ptr<BaseCore> output(input.clone());
51 Eigen::Matrix2d m;
52 Jacobian rhs = input._dAssignToQuadrupole(m(0, 0), m(1, 1), m(0, 1));
53 m(1, 0) = m(0, 1);
54 m = transform.getMatrix() * m * transform.getMatrix().transpose();
55 Jacobian lhs = output->_dAssignFromQuadrupole(m(0, 0), m(1, 1), m(0, 1));
56 Jacobian mid = Jacobian::Zero();
57 mid(0, 0) = transform[lsst::geom::LinearTransform::XX] * transform[lsst::geom::LinearTransform::XX];
58 mid(0, 1) = transform[lsst::geom::LinearTransform::XY] * transform[lsst::geom::LinearTransform::XY];
59 mid(0, 2) = 2 * transform[lsst::geom::LinearTransform::XY] * transform[lsst::geom::LinearTransform::XX];
60 mid(1, 0) = transform[lsst::geom::LinearTransform::YX] * transform[lsst::geom::LinearTransform::YX];
61 mid(1, 1) = transform[lsst::geom::LinearTransform::YY] * transform[lsst::geom::LinearTransform::YY];
62 mid(1, 2) = 2 * transform[lsst::geom::LinearTransform::YY] * transform[lsst::geom::LinearTransform::YX];
63 mid(2, 0) = transform[lsst::geom::LinearTransform::YX] * transform[lsst::geom::LinearTransform::XX];
64 mid(2, 1) = transform[lsst::geom::LinearTransform::YY] * transform[lsst::geom::LinearTransform::XY];
65 mid(2, 2) = transform[lsst::geom::LinearTransform::XX] * transform[lsst::geom::LinearTransform::YY] +
66 transform[lsst::geom::LinearTransform::XY] * transform[lsst::geom::LinearTransform::YX];
67 return lhs * mid * rhs;
68}
lsst::afw::geom::ellipses::BaseCore::Jacobian
Eigen::Matrix3d Jacobian
Parameter Jacobian matrix type.
Definition BaseCore.h:64

◆ dTransform()

BaseCore::Transformer::TransformDerivativeMatrix lsst::afw::geom::ellipses::BaseCore::Transformer::dTransform ( ) const

Return the derivative of transformed core with respect to transform parameters.

Definition at line 70 of file Transformer.cc.

70 {
71 std::shared_ptr<BaseCore> output(input.clone());
72 Eigen::Matrix2d m;
73 input._assignToQuadrupole(m(0, 0), m(1, 1), m(0, 1));
74 Eigen::Matrix<double, 3, 4> mid = Eigen::Matrix<double, 3, 4>::Zero();
75 m(1, 0) = m(0, 1);
76 mid(0, lsst::geom::LinearTransform::XX) = 2.0 * (transform[lsst::geom::LinearTransform::XX] * m(0, 0) +
77 transform[lsst::geom::LinearTransform::XY] * m(0, 1));
78 mid(0, lsst::geom::LinearTransform::XY) = 2.0 * (transform[lsst::geom::LinearTransform::XX] * m(0, 1) +
79 transform[lsst::geom::LinearTransform::XY] * m(1, 1));
80 mid(1, lsst::geom::LinearTransform::YX) = 2.0 * (transform[lsst::geom::LinearTransform::YX] * m(0, 0) +
81 transform[lsst::geom::LinearTransform::YY] * m(0, 1));
82 mid(1, lsst::geom::LinearTransform::YY) = 2.0 * (transform[lsst::geom::LinearTransform::YX] * m(0, 1) +
83 transform[lsst::geom::LinearTransform::YY] * m(1, 1));
84 mid(2, lsst::geom::LinearTransform::XX) = transform[lsst::geom::LinearTransform::YX] * m(0, 0) +
85 transform[lsst::geom::LinearTransform::YY] * m(0, 1);
86 mid(2, lsst::geom::LinearTransform::XY) = transform[lsst::geom::LinearTransform::YX] * m(0, 1) +
87 transform[lsst::geom::LinearTransform::YY] * m(1, 1);
88 mid(2, lsst::geom::LinearTransform::YX) = transform[lsst::geom::LinearTransform::XX] * m(0, 0) +
89 transform[lsst::geom::LinearTransform::XY] * m(0, 1);
90 mid(2, lsst::geom::LinearTransform::YY) = transform[lsst::geom::LinearTransform::XX] * m(0, 1) +
91 transform[lsst::geom::LinearTransform::XY] * m(1, 1);
92 m = transform.getMatrix() * m * transform.getMatrix().transpose();
93 Jacobian lhs = output->_dAssignFromQuadrupole(m(0, 0), m(1, 1), m(0, 1));
94 return lhs * mid;
95}

◆ inPlace()

void lsst::afw::geom::ellipses::BaseCore::Transformer::inPlace ( )

Transform the ellipse core in-place.

Definition at line 39 of file Transformer.cc.

39{ apply(input); }

Member Data Documentation

◆ input

BaseCore& lsst::afw::geom::ellipses::BaseCore::Transformer::input

input core to be transformed

Definition at line 75 of file Transformer.h.

◆ transform

lsst::geom::LinearTransform const& lsst::afw::geom::ellipses::BaseCore::Transformer::transform

transform object

Definition at line 76 of file Transformer.h.

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