CasaImageBeamSet.h

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#ifndef IMAGEANALYSIS_CASACasaImageBeamSet
#define IMAGEANALYSIS_CASACasaImageBeamSet

#include <images/Images/ImageBeamSet.h>

namespace casa {

// <summary>
// Represents a set of restoring beams associated with an image. Implements getCommonBeam()
// </summary>

// <use visibility=export>

// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>

// <prerequisite>
// </prerequisite>

// <etymology>
// A Set of Beams associated with an Image.
// </etymology>

// <synopsis>
// </synopsis>
//
// <example>

// </example>


// <motivation>
// Restoring beams are used many places in image analysis tasks.
// </motivation>

// <todo>
// </todo>

class CasaImageBeamSet : public ImageBeamSet {
public:

        // Construct an empty beam set.
        CasaImageBeamSet();

    // Construct a beam set from an 2-D array of beams representing
    // the frequency and stokes axis.
    // Axis length 1 means it is valid for all channels cq. stokes.
        // If the image has 0 spectral channels or stokes, the corresponding
        // length of the axis in the provided matrix should be 1.
        CasaImageBeamSet(
                const Matrix<GaussianBeam>& beams
        );

        // construct an CasaImageBeamSet representing a single beam which is valid for
        // all channels and stokes
        CasaImageBeamSet(const GaussianBeam& beam);

    // Create an CasaImageBeamSet of the specified shape with all
    // GaussianBeams initialized to <src>beam</src>.
    CasaImageBeamSet(uInt nchan, uInt nstokes, const GaussianBeam& beam=GaussianBeam::NULL_BEAM);

    // The copy constructor (reference semantics).
    CasaImageBeamSet(const CasaImageBeamSet& other);
    CasaImageBeamSet(const ImageBeamSet& other);

        ~CasaImageBeamSet();

    // Assignment can change the shape (copy semantics).
        CasaImageBeamSet& operator=(const CasaImageBeamSet& other);

    static const String& className();

        // Get a beam to which all other beams in the set can be convolved.
        // If all other beams can be convolved to the maximum area beam in the set, that beam will be returned.
        // If not, this is guaranteed to be the minimum area beam to which
        // all beams in the set can be convolved if all but one of the beams in the set can be convolved to the beam in the set with the
        // largest area. Otherwise, the returned beam may or may not be the smallest possible beam to which all the beams in the set
        // can be convolved.
        GaussianBeam getCommonBeam() const;

private:

        static void _transformEllipseByScaling(
                Double& transformedMajor, Double& transformedMinor,
                Double& transformedPa, Double major, Double minor,
                Double pa, Double xScaleFactor, Double yScaleFactor
        );
};

ostream &operator<<(ostream &os, const CasaImageBeamSet& beamSet);

}

#endif