AnnEllipse.h

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#ifndef ANNOTATIONS_ANNELLIPSE_H
#define ANNOTATIONS_ANNELLIPSE_H

#include <imageanalysis/Annotations/AnnRegion.h>


#include <casa/aips.h>

namespace casa {

// <summary>
// This class represents an annotation of an elliptical (in position coordinates) region specified
// in an ascii region file as proposed in CAS-2285. It is specified by its center position
// semi-major and semi-minor axes, and position angle.
// </summary>
// <author>Dave Mehringer</author>
// <use visibility=export>
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
// <prerequisite>

// </prerequisite>

// <etymology>
// Holds the specification of a an annotation of an elliptical region as specified in ASCII format.
// Specified by center position, semi-major and semi-minor axes, and position angle.
// </etymology>

// <synopsis>
// This class represents an annotation of an elliptical region in coordinate space specified by
// center, semi-major and semi-minor axes, and position angle
// </synopsis>

class AnnEllipse: public AnnRegion {

public:

        // <src>positionAngle</src> is defined as the angle between north and the
        // ellipse major axis. Note the lengths are for the semi-major and semi-minor axes,
        // not the major and minor axes
        // <group>

        AnnEllipse(
                const Quantity& xcenter, const Quantity& ycenter,
                const Quantity& semiMajorAxis,
                const Quantity& semiMinorAxis, const Quantity& positionAngle,
                const String& dirRefFrameString,
                const CoordinateSystem& csys,
                const IPosition& imShape,
                const Quantity& beginFreq,
                const Quantity& endFreq,
                const String& freqRefFrameString,
                const String& dopplerString,
                const Quantity& restfreq,
                const Vector<Stokes::StokesTypes> stokes,
                const Bool annotationOnly
        );

        // Simplified constructor.
        // all frequencies are used (these can be set after construction).
        // xcenter and ycenter
        // must be in the same frame as the csys direction coordinate.
        // is a region (not just an annotation), although this value can be changed after
        // construction.
        AnnEllipse(
                const Quantity& xcenter, const Quantity& ycenter,
                const Quantity& semiMajorAxis,
                const Quantity& semiMinorAxis, const Quantity& positionAngle,
                const CoordinateSystem& csys,
                const IPosition& imShape,
                const Vector<Stokes::StokesTypes>& stokes
        );

        // implicit copy constructor and destructor are fine

        //</group>

        AnnEllipse& operator=(const AnnEllipse& other);

        Bool operator==(const AnnEllipse& other) const;

        // Get the center position, tranformed to the reference
        // from of the coordinate system if necessary
        MDirection getCenter() const;

        // get semi-major axis. The quantity will have units
        // of angular measure
        Quantity getSemiMajorAxis() const;

        // get semi-minor axis. The quantity will have units
        // of angular measure
        Quantity getSemiMinorAxis() const;

        // get position angle. The quantity will have units
        // of angular measure and will be measured from north through east,
        // using the normal astronomical convention.
        Quantity getPositionAngle() const;

        virtual ostream& print(ostream &os) const;


private:
        AnnotationBase::Direction _inputCenter;
        Quantity _inputSemiMajorAxis, _inputSemiMinorAxis, _inputPositionAngle,
                _convertedSemiMajorAxis, _convertedSemiMinorAxis,
                _convertedPositionAngle;

        void _init(     const Quantity& xcenter, const Quantity& ycenter);
};

}

#endif /* ASCIIELLIPSEREGION_H_ */