PtSrcTiler.h

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// $Id: PtSrcTiler.h,v 1.1 2010/12/13 21:06:31 eml Exp $

#ifndef SZA_UTIL_PTSRCTILER_H
#define SZA_UTIL_PTSRCTILER_H

#include "carma/szautil/Declination.h"
#include "carma/szautil/HourAngle.h"
#include "carma/szautil/Angle.h"

#include <vector>

namespace sza {
  namespace util {

    class PtSrcTiler {
    public:

      // Object to encapsulate a single field to search for point
      // sources

      struct Field {
        HourAngle ra_;     // The center RA of this field
        Declination dec_;  // The center DEC of this field 
        std::vector<Field*> neighbors_; // The 6 fields that
                                        // surround this one, order
                                        // in order if increasing clockwise angle
        Angle radius_;     // The radius of this field

        // Constructors

        Field(HourAngle ra, Declination dec, Angle radius);
        Field(const Field& field);
        Field();

        // For the current field, add all nearest neighbors in a hex
        // pattern

        std::vector<Field> addNeighbors(std::vector<Field>& fields, 
                                        HourAngle& ra0, Declination& dec0,
                                        Angle& min);

        void addNeighbor(unsigned index, Field* field);
        
        // Return the distance of this field from the given ra/dec
        
        Angle distance(HourAngle ra, Declination dec);

      };

      PtSrcTiler();

      virtual ~PtSrcTiler();

      // Construct the list of fields to search

      static std::vector<Field> constructFields(HourAngle ra,      Declination dec, 
                                                Angle fieldRadius, Angle totalRadius);


      static void addLayer(unsigned iLayer, Angle& fieldRad, HourAngle& ra0, Declination& dec0, 
                           std::vector<Field>& fields);

    private:
    }; // End class PtSrcTiler

  } // End namespace util
} // End namespace sza



#endif // End #ifndef SZA_UTIL_PTSRCTILER_H