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LinearTransform.cc
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1/*
2 * Developed for the LSST Data Management System.
3 * This product includes software developed by the LSST Project
4 * (https://www.lsst.org).
5 * See the COPYRIGHT file at the top-level directory of this distribution
6 * for details of code ownership.
7 *
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <https://www.gnu.org/licenses/>.
20 */
21
22#include <iostream>
23#include <iomanip>
24
25#include "Eigen/LU"
26
28
29namespace lsst {
30namespace geom {
31
34 r << (*this)[XX], (*this)[YX], (*this)[XY], (*this)[YY];
35 return r;
36}
37
39 (*this)[XX] = vector[XX];
40 (*this)[XY] = vector[XY];
41 (*this)[YX] = vector[YX];
42 (*this)[YY] = vector[YY];
43}
44
46 Eigen::FullPivLU<Matrix> lu(getMatrix());
47 if (!lu.isInvertible()) {
48 throw LSST_EXCEPT(SingularTransformException, "Could not compute LinearTransform inverse");
49 }
50 Matrix inv = lu.inverse();
51 return LinearTransform(inv);
52}
53
54double LinearTransform::computeDeterminant() const noexcept { return getMatrix().determinant(); }
55
57 TransformDerivativeMatrix r = TransformDerivativeMatrix::Zero();
58 r(0, XX) = input.getX();
59 r(0, XY) = input.getY();
60 r(1, YX) = input.getX();
61 r(1, YY) = input.getY();
62 return r;
63}
64
66 std::ios::fmtflags flags = os.flags();
67 int prec = os.precision(7);
68 os.setf(std::ios::fixed);
69 os << "LinearTransform([(" << std::setw(10) << t[LinearTransform::XX] << "," << std::setw(10)
70 << t[LinearTransform::XY] << "),\n";
71 os << " (" << std::setw(10) << t[LinearTransform::YX] << "," << std::setw(10)
72 << t[LinearTransform::YY] << ")])";
73 os.precision(prec);
74 os.flags(flags);
75 return os;
76}
77
78} // namespace geom
79} // namespace lsst
#define LSST_EXCEPT(type,...)
Create an exception with a given type.
Definition Exception.h:48
A 2D linear coordinate transformation.
Eigen::Matrix< double, 2, 2, Eigen::DontAlign > Matrix
ParameterVector const getParameterVector() const noexcept
Return the transform matrix elements as a parameter vector.
Matrix const & getMatrix() const noexcept
LinearTransform const inverted() const
Return the inverse transform.
double computeDeterminant() const noexcept
Return the determinant of the 2x2 matrix.
Eigen::Matrix< double, 4, 1 > ParameterVector
LinearTransform() noexcept
Construct an empty (identity) LinearTransform.
TransformDerivativeMatrix dTransform(Point2D const &input) const noexcept
Derivative of (*this)(input) with respect to the transform elements (for Point).
void setParameterVector(ParameterVector const &vector) noexcept
Set the transform matrix elements from a parameter vector.
Eigen::Matrix< double, 2, 4 > TransformDerivativeMatrix
T flags(T... args)
std::ostream & operator<<(std::ostream &os, lsst::geom::AffineTransform const &transform)
Point< double, 2 > Point2D
Definition Point.h:324
T precision(T... args)
T setf(T... args)
T setw(T... args)