TwoTransfoMapping.h

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// -*- LSST-C++ -*-
/*
 * This file is part of jointcal.
 *
 * Developed for the LSST Data Management System.
 * This product includes software developed by the LSST Project
 * (https://www.lsst.org).
 * See the COPYRIGHT file at the top-level directory of this distribution
 * for details of code ownership.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef LSST_JOINTCAL_TWO_TRANSFO_MAPPING_H
#define LSST_JOINTCAL_TWO_TRANSFO_MAPPING_H

#include "memory"

#include "lsst/jointcal/AstrometryMapping.h"
#include "lsst/jointcal/Eigenstuff.h"
#include "lsst/jointcal/SimpleAstrometryMapping.h"

namespace lsst {
namespace jointcal {

class TwoTransfoMapping : public AstrometryMapping {
public:
    TwoTransfoMapping(std::shared_ptr<SimpleGtransfoMapping> chipMapping,
                      std::shared_ptr<SimpleGtransfoMapping> visitMapping);

    TwoTransfoMapping(TwoTransfoMapping const &) = delete;
    TwoTransfoMapping(TwoTransfoMapping &&) = delete;
    TwoTransfoMapping &operator=(TwoTransfoMapping const &) = delete;
    TwoTransfoMapping &operator=(TwoTransfoMapping &&) = delete;

    unsigned getNpar() const;

    void getMappingIndices(std::vector<unsigned> &indices) const;

    void computeTransformAndDerivatives(FatPoint const &where, FatPoint &outPoint, Eigen::MatrixX2d &H) const;
    void transformPosAndErrors(FatPoint const &where, FatPoint &outPoint) const;

    void offsetParams(Eigen::VectorXd const &delta) {
        _m1->offsetParams(delta.segment(_m1->getIndex(), _m1->getNpar()));
        _m2->offsetParams(delta.segment(_m2->getIndex() + _m1->getNpar(), _m2->getNpar()));
    }

    Gtransfo const &getTransfo1() const { return _m1->getTransfo(); }

    Gtransfo const &getTransfo2() const { return _m2->getTransfo(); }

    void positionDerivative(Point const &where, Eigen::Matrix2d &derivative, double epsilon) const;

    void freezeErrorTransform();

private:
    friend class ConstrainedAstrometryModel;
    void setWhatToFit(const bool fittingT1, const bool fittingT2);

    std::shared_ptr<SimpleGtransfoMapping> _m1, _m2;
    unsigned _nPar1, _nPar2;
    struct tmpVars  // just there to get around constness issues
    {
        Eigen::MatrixX2d h1, h2;
        Eigen::Matrix2d dt2dx;
    };

    std::unique_ptr<tmpVars> tmp;
};
}  // namespace jointcal
}  // namespace lsst

#endif  // LSST_JOINTCAL_TWO_TRANSFO_MAPPING_H