GridTransform.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.
 * 
 * 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_AFW_GEOM_ELLIPSES_GridTransform_h_INCLUDED
#define LSST_AFW_GEOM_ELLIPSES_GridTransform_h_INCLUDED

#include "Eigen/Eigenvalues"

#include "lsst/afw/geom/ellipses/Ellipse.h"
#include "lsst/afw/geom/AffineTransform.h"

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

class BaseCore::GridTransform {
public:

    typedef Eigen::Matrix<double,4,3> DerivativeMatrix;

    explicit GridTransform(BaseCore const & input);
    
    operator LinearTransform () const;

    LinearTransform::Matrix getMatrix() const;

    DerivativeMatrix d() const;

    double getDeterminant() const;

    LinearTransform invert() const;

private:

    BaseCore const & _input; 
    Eigen::SelfAdjointEigenSolver<Eigen::Matrix2d> _eig;
};

class Ellipse::GridTransform {
public:
    
    typedef Eigen::Matrix<double,6,5> DerivativeMatrix;

    explicit GridTransform(Ellipse const & input);

    AffineTransform::Matrix getMatrix() const;
    
    DerivativeMatrix d() const;
    
    double getDeterminant() const;

    operator AffineTransform () const;

    AffineTransform invert() const;

private:

    Ellipse const & _input; 
    BaseCore::GridTransform _coreGt;
};

inline BaseCore::GridTransform const BaseCore::getGridTransform() const{
    return BaseCore::GridTransform(*this);
}

inline Ellipse::GridTransform const Ellipse::getGridTransform() const {
    return Ellipse::GridTransform(*this);
}

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

#endif // !LSST_AFW_GEOM_ELLIPSES_GridTransform_h_INCLUDED