MultiShapeletFunction.h

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

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#ifndef LSST_AFW_MATH_SHAPELETS_MULTISHAPELETFUNCTION_H
#define LSST_AFW_MATH_SHAPELETS_MULTISHAPELETFUNCTION_H

#include "lsst/shapelet/ShapeletFunction.h"
#include <vector>

namespace lsst { namespace shapelet {

class MultiShapeletFunctionEvaluator;

class MultiShapeletFunction {
public:

    typedef std::shared_ptr<MultiShapeletFunction> Ptr;
    typedef std::shared_ptr<MultiShapeletFunction const> ConstPtr;

    typedef MultiShapeletFunctionEvaluator Evaluator;

    typedef ShapeletFunction Component;

    typedef std::vector<Component> ComponentList;

    ComponentList & getComponents() { return _components; }

    ComponentList const & getComponents() const { return _components; }

    void normalize(double value=1.0);

    void shiftInPlace(geom::Extent2D const & offset);

    void transformInPlace(geom::AffineTransform const & transform);

    MultiShapeletFunction convolve(ShapeletFunction const & other) const;

    MultiShapeletFunction convolve(MultiShapeletFunction const & other) const;

    Evaluator evaluate() const;

    MultiShapeletFunction() : _components() {}

    MultiShapeletFunction(MultiShapeletFunction const & other) = default;

    explicit MultiShapeletFunction(ComponentList const & components) : _components(components) {}

    explicit MultiShapeletFunction(ShapeletFunction const & component) : _components(1, component) {}

private:
    ComponentList _components;
};

class MultiShapeletFunctionEvaluator {
public:

    typedef std::shared_ptr<MultiShapeletFunctionEvaluator> Ptr;
    typedef std::shared_ptr<MultiShapeletFunctionEvaluator const> ConstPtr;

    double operator()(double x, double y) const {
        return this->operator()(geom::Point2D(x, y));
    }

    double operator()(geom::Point2D const & point) const;

    double operator()(geom::Extent2D const & point) const;

    ndarray::Array<double,1,1> operator()(
        ndarray::Array<double const,1> const & x,
        ndarray::Array<double const,1> const & y
    ) const;

    void addToImage(
        ndarray::Array<double,2,1> const & array,
        geom::Point2I const & xy0 = geom::Point2I()
    ) const;

    void addToImage(afw::image::Image<double> & image) const {
        addToImage(image.getArray(), image.getXY0());
    }

    double integrate() const;

    afw::geom::ellipses::Ellipse computeMoments() const;

    void update(MultiShapeletFunction const & function);

    explicit MultiShapeletFunctionEvaluator(MultiShapeletFunction const & function);

private:
    typedef ShapeletFunctionEvaluator Component;
    typedef std::list<Component> ComponentList;
    ComponentList _components;
};

inline MultiShapeletFunctionEvaluator MultiShapeletFunction::evaluate() const {
    return MultiShapeletFunctionEvaluator(*this);
}

}} // namespace lsst::shapelet

#endif // !defined(LSST_AFW_MATH_SHAPELETS_MULTISHAPELETFUNCTION_H)