EllipticityBase.h

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// -*- lsst-c++ -*-

/* 
 * LSST Data Management System
 * Copyright 2008, 2009, 2010 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.
 * 
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#ifndef LSST_AFW_GEOM_ELLIPSES_EllipticityBase_h_INCLUDED
#define LSST_AFW_GEOM_ELLIPSES_EllipticityBase_h_INCLUDED

#include "Eigen/Core"
#include <complex>

namespace lsst { namespace afw { namespace geom { namespace ellipses {

namespace detail {

class EllipticityBase {
public:

    typedef Eigen::Matrix2d Jacobian;

    enum ParameterEnum { E1=0, E2=1 };

    std::complex<double> & getComplex() { return _complex; }

    std::complex<double> const & getComplex() const { return _complex; }

    void setComplex(std::complex<double> const & v) { _complex = v; }

    double getE1() const { return _complex.real(); }
    void setE1(double e1) {
#if __cplusplus < 201103L
        _complex = std::complex<double>(e1, _complex.imag());
#else
        _complex.real(e1);
#endif
    }

    double getE2() const { return _complex.imag(); }
    void setE2(double e2) {
#if __cplusplus < 201103L
        _complex = std::complex<double>(_complex.real(), e2);
#else
        _complex.imag(e2);
#endif
    }

    double getE() const { return std::sqrt(std::norm(_complex)); }
    void setE(double e) { _complex *= e / getE(); }

    double getTheta() const { return 0.5 * std::arg(_complex); }

protected:

    explicit EllipticityBase(std::complex<double> const & complex) : _complex(complex) {}

    explicit EllipticityBase(double e1=0.0, double e2=0.0) : _complex(e1, e2) {}

    std::complex<double> _complex;
};

} // namespace detail

}}}} // namespace lsst::afw::geom::ellipses

#endif // !LSST_AFW_GEOM_ELLIPSES_EllipticityBase_h_INCLUDED