HermiteTransformMatrix.h

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

#include "Eigen/Core"

#include "lsst/geom.h"
#include "lsst/shapelet/constants.h"

namespace lsst { namespace shapelet {

class HermiteTransformMatrix {
public:

    Eigen::MatrixXd compute(Eigen::Matrix2d const & transform) const {
        return compute(transform, _order);
    }

    Eigen::MatrixXd compute(geom::LinearTransform const & transform) const {
        return compute(transform.getMatrix(), _order);
    }

    Eigen::MatrixXd compute(Eigen::Matrix2d const & transform, int order) const;

    Eigen::MatrixXd compute(geom::LinearTransform const & transform, int order) const {
        return compute(transform.getMatrix(), order);
    }

    Eigen::MatrixXd getCoefficientMatrix() const { return _coeffFwd; }

    Eigen::MatrixXd getInverseCoefficientMatrix() const { return _coeffInv; }

    int getOrder() const { return _order; }

    explicit HermiteTransformMatrix(int order);

private:
    int _order;
    Eigen::MatrixXd _coeffFwd;
    Eigen::MatrixXd _coeffInv;
};

}} // namespace lsst::shapelet

#endif // !LSST_AFW_MATH_SHAPELETS_HermiteTransformMatrix