UnitSystem.h

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// -*- lsst-c++ -*-
/*
 * LSST Data Management System
 * Copyright 2008-2013 LSST Corporation.
 *
 * This product includes software developed by the
 * LSST Project (http://www.lsst.org/).
 *
 * 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 LSST License Statement and
 * the GNU General Public License along with this program.  If not,
 * see <http://www.lsstcorp.org/LegalNotices/>.
 */

#ifndef LSST_MEAS_MODELFIT_UnitSystem_h_INCLUDED
#define LSST_MEAS_MODELFIT_UnitSystem_h_INCLUDED

#include "lsst/afw/image/Exposure.h"
#include "lsst/afw/geom/SpherePoint.h"
#include "lsst/afw/geom/SkyWcs.h"
#include "lsst/afw/image/Calib.h"
#include "lsst/afw/geom/AffineTransform.h"

#include "lsst/meas/modelfit/common.h"

namespace lsst {
namespace meas {
namespace modelfit {

struct UnitSystem {
    PTR(afw::geom::SkyWcs const) wcs;
    PTR(afw::image::Calib const) calib;

    UnitSystem(afw::geom::SpherePoint const& position, std::shared_ptr<const lsst::afw::image::Calib> calibIn,
               double flux);
    UnitSystem(afw::geom::SpherePoint const& position, Scalar mag);

    UnitSystem(PTR(afw::geom::SkyWcs const) wcs_, PTR(afw::image::Calib const) calib_)
            : wcs(wcs_), calib(validateCalib(calib_)) {}

    template <typename T>
    UnitSystem(afw::image::Exposure<T> const& exposure)
            : wcs(exposure.getWcs()), calib(validateCalib(exposure.getCalib())) {}

private:
    std::shared_ptr<const lsst::afw::image::Calib> validateCalib(
            std::shared_ptr<const lsst::afw::image::Calib> calib_);
    static std::shared_ptr<const lsst::afw::image::Calib> getDefaultCalib();
};

struct LocalUnitTransform {
    afw::geom::AffineTransform geometric;

    double flux;

    double sb;

    LocalUnitTransform(afw::geom::Point2D const& sourcePixel, UnitSystem const& source,
                       UnitSystem const& destination);

    LocalUnitTransform() : geometric(), flux(1.0), sb(1.0) {}
};

}  // namespace modelfit
}  // namespace meas
}  // namespace lsst

#endif  // !LSST_MEAS_MODELFIT_UnitSystem_h_INCLUDED