PositionFunctor.h

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

/*
 * LSST Data Management System
 * Copyright 2008 - 2012 LSST Corporation.
 *
 * This product includes software developed by the
 * LSST Project (http://www.lsst.org/).
 *
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#ifndef LSST_AFW_MATH_DETAIL_POSITIONFUNCTOR_H
#define LSST_AFW_MATH_DETAIL_POSITIONFUNCTOR_H

#include "lsst/afw/geom/Point.h"
#include "lsst/afw/geom/AffineTransform.h"
#include "lsst/afw/geom/XYTransform.h"
#include "lsst/afw/image/ImageUtils.h"
#include "lsst/afw/image/Wcs.h"

namespace lsst {
namespace afw {
namespace math {
namespace detail {

    class PositionFunctor {
    public:
        typedef std::shared_ptr<PositionFunctor> Ptr;

        explicit PositionFunctor() {};
        virtual ~PositionFunctor() {};

        virtual lsst::afw::geom::Point2D operator()(int destCol, int destRow) const = 0;
    };


    class XYTransformPositionFunctor : public PositionFunctor {
    public:
        explicit XYTransformPositionFunctor(
            lsst::afw::geom::Point2D const &destXY0,    
            lsst::afw::geom::XYTransform const &XYTransform     
        ) :
            PositionFunctor(),
            _destXY0(destXY0),
            _xyTransformPtr(XYTransform.clone())
        {}

        virtual ~XYTransformPositionFunctor() {};

        virtual lsst::afw::geom::Point2D operator()(int destCol, int destRow) const {
            afw::geom::Point2D const destPos{
                lsst::afw::image::indexToPosition(destCol + _destXY0[0]),
                lsst::afw::image::indexToPosition(destRow + _destXY0[1])
            };
            return _xyTransformPtr->reverseTransform(destPos);
        }

    private:
        lsst::afw::geom::Point2D const _destXY0;
        PTR(lsst::afw::geom::XYTransform const) _xyTransformPtr;
    };

}}}} // namespace lsst::afw::math::detail

#endif // !defined(LSST_AFW_MATH_DETAIL_POSITIONFUNCTOR_H)