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void findGridSector(const casacore::Int& nxp, const casacore::Int& nyp, const casacore::Int& ixsub, const casacore::Int& iysub, const casacore::Int& minx, const casacore::Int& miny, const casacore::Int& icounter, casacore::Int& x0, casacore::Int& y0, casacore::Int& nxsub, casacore::Int& nysub, const casacore::Bool linear);
//# WProjectFT.h: Definition for WProjectFT
//# Copyright (C) 2003-2016
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be adressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//#
//# $Id$
namespace casacore{
template <class K, class V> class SimpleOrderedMap;
template <class T> class PtrBlock;
template <class T> class CountedPtr;
}
namespace casa { //# NAMESPACE CASA - BEGIN
class WPConvFunc;
// <summary> An FTMachine for Gridded Fourier transforms </summary>
// <use visibility=export>
// <reviewed reviewer="" date="" tests="" demos="">
// <prerequisite>
// <li> <linkto class=FTMachine>FTMachine</linkto> module
// <li> <linkto class=SkyEquation>SkyEquation</linkto> module
// <li> <linkto class=VisBuffer>VisBuffer</linkto> module
// </prerequisite>
//
// <etymology>
// FTMachine is a Machine for Fourier Transforms. WProjectFT does
// Grid-based Fourier transforms.
// </etymology>
//
// <synopsis>
// The <linkto class=SkyEquation>SkyEquation</linkto> needs to be able
// to perform Fourier transforms on visibility data. WProjectFT
// allows efficient Fourier Transform processing using a
// <linkto class=VisBuffer>VisBuffer</linkto> which encapsulates
// a chunk of visibility (typically all baselines for one time)
// together with all the information needed for processing
// (e.g. UVW coordinates).
//
// Gridding and degridding in WProjectFT are performed using a
// novel sort-less algorithm. In this approach, the gridded plane is
// divided into small patches, a cache of which is maintained in memory