AnnCircle.h

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#ifndef ANNOTATIONS_ANNCIRCLE_H
#define ANNOTATIONS_ANNCIRCLE_H

#include <casa/aips.h>
#include <imageanalysis/Annotations/AnnRegion.h>

namespace casa {

// <summary>
// This class represents an annotation for a circular (in position coordinates) region specified
// in an ascii region file as proposed in CAS-2285. It is specified by its center position
// and radius.
// </summary>
// <author>Dave Mehringer</author>
// <use visibility=export>
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
// <prerequisite>

// </prerequisite>

// <etymology>
// Holds the specification of an annotation of a circular region as specified in ASCII format.
// Specified by center position and radius.
// </etymology>

// <synopsis>
// This class represents an annotation of a circular region in coordinate space specified by
// center and radius. Note that this represents a world coordinate region, even if the input
// radius is in pixels. If the direction coordinate does not have square pixels, then
// AnnEllipse should be used instead.
// </synopsis>

class AnnCircle: public AnnRegion {

public:

        AnnCircle(
                const Quantity& xcenter,
                const Quantity& ycneter,
                const Quantity& radius,
                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.
        AnnCircle(
                const Quantity& xcenter,
                const Quantity& ycneter,
                const Quantity& radius,
                const CoordinateSystem& csys,
                const IPosition& imShape,
                const Vector<Stokes::StokesTypes>& stokes
        );

        // implicit copy constructor and destructor are fine

        AnnCircle& operator=(const AnnCircle& other);

        // get center position, converted to the reference frame
        // of the coordinate system if necessary
        MDirection getCenter() const;

        // get the radius of the circle with angular units
        Quantity getRadius() const;

        virtual ostream& print(ostream &os) const;

private:
        AnnotationBase::Direction _inputCenter;
        Quantity _inputRadius, _convertedRadius;

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

};

}

#endif /* ASCIICIRCLEREGION_H_ */