GaussHermiteProjection.h

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// -*- LSST-C++ -*-
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#ifndef LSST_AFW_MATH_SHAPELETS_GaussHermiteProjection
#define LSST_AFW_MATH_SHAPELETS_GaussHermiteProjection

#include "Eigen/Core"
#include "lsst/afw/geom/ellipses.h"
#include "lsst/geom.h"
#include "lsst/shapelet/HermiteTransformMatrix.h"

namespace lsst { namespace shapelet {

class GaussHermiteProjection {
public:

    Eigen::MatrixXd compute(
        afw::geom::ellipses::Quadrupole const & inputEllipse, int inputOrder,
        afw::geom::ellipses::Quadrupole const & outputEllipse, int outputOrder
    ) const {
        return compute(
            inputEllipse.getGridTransform().getMatrix(), inputOrder,
            outputEllipse.getGridTransform().getMatrix(), outputOrder
        );
    }

    Eigen::MatrixXd compute(
        geom::LinearTransform const & inputTransform, int inputOrder,
        geom::LinearTransform const & outputTransform, int outputOrder
    ) const {
        return compute(
            inputTransform.getMatrix(), inputOrder,
            outputTransform.getMatrix(), outputOrder
        );
    }

    Eigen::MatrixXd compute(
        Eigen::Matrix2d const & inputTransform, int inputOrder,
        Eigen::Matrix2d const & outputTransform, int outputOrder
    ) const;

    int getMaxOrder() const { return _htm.getOrder(); }

    explicit GaussHermiteProjection(int maxOrder) : _htm(maxOrder) {}

private:
    HermiteTransformMatrix _htm;
};
}} // namespace lsst::shapelet

#endif // !LSST_AFW_MATH_SHAPELETS_GaussHermiteProjection