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       1             : //# PBMath1DAiry.h: Definitions of 1-D Airy PBMath objects
       2             : //# Copyright (C) 1996,1997,1998,2003
       3             : //# Associated Universities, Inc. Washington DC, USA.
       4             : //#
       5             : //# This library is free software; you can redistribute it and/or modify it
       6             : //# under the terms of the GNU Library General Public License as published by
       7             : //# the Free Software Foundation; either version 2 of the License, or (at your
       8             : //# option) any later version.
       9             : //#
      10             : //# This library is distributed in the hope that it will be useful, but WITHOUT
      11             : //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12             : //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
      13             : //# License for more details.
      14             : //#
      15             : //# You should have received a copy of the GNU Library General Public License
      16             : //# along with this library; if not, write to the Free Software Foundation,
      17             : //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
      18             : //#
      19             : //# Correspondence concerning AIPS++ should be adressed as follows:
      20             : //#        Internet email: casa-feedback@nrao.edu.
      21             : //#        Postal address: AIPS++ Project Office
      22             : //#                        National Radio Astronomy Observatory
      23             : //#                        520 Edgemont Road
      24             : //#                        Charlottesville, VA 22903-2475 USA
      25             : //#
      26             : //#
      27             : //# $Id$
      28             : 
      29             : #ifndef SYNTHESIS_PBMATH1DAIRY_H
      30             : #define SYNTHESIS_PBMATH1DAIRY_H
      31             : 
      32             : #include <casacore/casa/aips.h>
      33             : #include <synthesis/TransformMachines/PBMath1D.h>
      34             : #include <casacore/measures/Measures.h>
      35             : 
      36             : namespace casa { //# NAMESPACE CASA - BEGIN
      37             : 
      38             : //#forward
      39             : 
      40             : // <summary> 
      41             : // PBMath1DAiry is a 1-D Airy Disk voltage pattern & Primary Beam
      42             : // </summary>
      43             : 
      44             : // <use visibility=export>
      45             : 
      46             : // <reviewed reviewer="" date="" tests="" demos="">
      47             : 
      48             : // <prerequisite>
      49             : // <li> <linkto class="PBMathInterface">PBMathInterface</linkto> class
      50             : // <li> <linkto class="PBMath1D">PBMath1D</linkto> class
      51             : // </prerequisite>
      52             : //
      53             : // <etymology>
      54             : // PBMath1DAiry: derived from  PBMath1D, implements an Airy pattern PB and VP
      55             : // </etymology>
      56             : //
      57             : // <synopsis> 
      58             : // See PBMath1D for a general synopsis of the 1D PB types.
      59             : //
      60             : // For an unblocked dish:
      61             : // VP(x) = 2 * j1(x)/x
      62             : //
      63             : // For blockage:
      64             : // areaRatio = (dish/block)^2;
      65             : // lengthRat = (dish/block);
      66             : // VP(x) = ( areaRatio* 2 * j1(x)/x - 2  j1(x*lengthRat)/(x*lengthRat) ) / (areaRatio - 1);
      67             : // </synopsis> 
      68             : //    
      69             : //
      70             : // <example>
      71             : // <srcblock>
      72             : //    PBMath1DAiry airyPB( casacore::Quantity(24.5,"m"), casacore::Quantity(2.5,"m"),
      73             : //                         casacore::Quantity(2*0.8564,"deg"), casacore::Quantity(1.0,"GHz") );
      74             : //    airyPB.applyPB( inImage, outImage, pointingDir);
      75             : // </srcblock>
      76             : // </example>
      77             : //
      78             : // <motivation>
      79             : // All of the 1-D PB types have everything in common except for the
      80             : // details of their parameterization.  This lightweight class
      81             : // deals with those differences: construction, filling the PBArray
      82             : // from construction parameters, and flushing to disk.
      83             : // </motivation>
      84             : //
      85             : // <todo asof="98/10/21">
      86             : // <li> constructor from a casacore::MS beam subtable
      87             : // <li> flush to casacore::MS beam subtable
      88             : // </todo>
      89             : 
      90             :  
      91             : class PBMath1DAiry : public PBMath1D {
      92             : public:
      93             : 
      94             :   PBMath1DAiry();
      95             : 
      96             :   // Instantiation from arguments; 
      97             :   // referenceFreq is used to scale maximumradius.
      98             :   // default = no squint
      99             :   // squint is the offset from pointing center if the casacore::Stokes R beam
     100             :   // useSymmetricBeam forces a fit to the squinted beam
     101             :   PBMath1DAiry(casacore::Quantity dishDiam, casacore::Quantity blockedDiam,
     102             :                casacore::Quantity maxRad, casacore::Quantity refFreq, 
     103          22 :                BeamSquint squint=BeamSquint(casacore::MDirection(casacore::Quantity(0.0, "deg"),
     104          22 :                                                        casacore::Quantity(0.0, "deg"),
     105             :                                                        casacore::MDirection::Ref(casacore::MDirection::AZEL)),
     106          22 :                                             casacore::Quantity(1.0, "GHz")),
     107             :                casacore::Bool useSymmetricBeam=false);
     108             : 
     109             :   // Instantiation from a row in the Beam subTable
     110             :   //PBMath1DAiry(const casacore::Table& BeamSubTable, casacore::Int row, 
     111             :   //           casacore::Bool useSymmetricBeam=false);
     112             : 
     113             :   // Copy constructor
     114             :   // PBMath1DAiry(const PBMath1DAiry& other);
     115             : 
     116             :   // Assignment operator, by reference
     117             :   PBMath1DAiry& operator=(const PBMath1DAiry& other);
     118             : 
     119             :   // Clone the object
     120             :   //  casacore::CountedPtr<PBMathInterface> clone();
     121             : 
     122             :   //destructor
     123             :   ~PBMath1DAiry();  
     124             : 
     125             :   // Get the type of PB this is
     126          28 :   PBMathInterface::PBClass whichPBClass() { return PBMathInterface::AIRY; }  
     127             :   
     128             :   // Flush the construction parameters to disk
     129             :   // casacore::Bool flushToTable(casacore::Table& beamSubTable, casacore::Int iRow);
     130             : 
     131             :   // Summarize the construction data for this primary beam
     132             :   void summary(casacore::Int nValues=0);
     133             : 
     134             : protected:
     135             : 
     136             :   // Fill in vp_p array from construction parameters
     137             :   void fillPBArray();
     138             : 
     139             : private:    
     140             : 
     141             :   casacore::Quantity dishDiam_p;
     142             :   casacore::Quantity blockedDiam_p;
     143             : 
     144             : };
     145             : 
     146             : 
     147             : } //# NAMESPACE CASA - END
     148             : 
     149             : #endif