ConversionMatrix.h

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// -*- LSST-C++ -*-

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#ifndef LSST_AFW_MATH_SHAPELETS_CONVERSIONMATRIX_H
#define LSST_AFW_MATH_SHAPELETS_CONVERSIONMATRIX_H


#include "lsst/afw/geom/ellipses.h"
#include "ndarray.h"
#include "lsst/shapelet/constants.h"

namespace lsst { namespace shapelet {

class ConversionMatrix {
public:

    Eigen::MatrixXd getBlock(int n) const;

    Eigen::MatrixXd buildDenseMatrix() const;

    void multiplyOnLeft(ndarray::Array<double,1> const & array) const;
    
    void multiplyOnRight(ndarray::Array<double,1> const & array) const;

    explicit ConversionMatrix(BasisTypeEnum input, BasisTypeEnum output, int order);

    static void convertCoefficientVector(
        ndarray::Array<double,1> const & array,
        BasisTypeEnum input,
        BasisTypeEnum output, int order
    );

    static void convertOperationVector(
        ndarray::Array<double,1> const & array,
        BasisTypeEnum input,
        BasisTypeEnum output, int order
    );
    
private:
    int _order;
    BasisTypeEnum _input;
    BasisTypeEnum _output;
};


}} // namespace lsst::shapelet

#endif // !defined(LSST_AFW_MATH_SHAPELETS_CONVERSIONMATRIX_H)