/usr/include/casacore/scimath/Mathematics/NNGridder.tcc is in casacore-dev 2.2.0-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | //# NNGridder.cc: Nearest Neighbour Gridder
//# Copyright (C) 1996,1997,1999
//# 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 Library 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 Library 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 addressed 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
//#
//#
//# $Id$
#ifndef SCIMATH_NNGRIDDER_TCC
#define SCIMATH_NNGRIDDER_TCC
#include <casacore/scimath/Mathematics/NNGridder.h>
#include <casacore/casa/BasicSL/Constants.h>
#include <casacore/casa/Arrays/ArrayMath.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
// Constructor
template <class Domain, class Range>
NNGridder<Domain, Range>::NNGridder(const IPosition& shape,
const Vector<Domain>& scale,
const Vector<Domain>& offset)
: Gridder<Domain, Range>(shape, scale, offset)
{
fillCorrectionVectors();
loc.resize(ndim);
loc=0;
}
// Grid a value by moving to nearest neighbour
template <class Domain, class Range>
Bool NNGridder<Domain, Range>::grid(Array<Range> &gridded,
const Vector<Domain>& position,
const Range& value)
{
loc=location(loc, position);
loc-=offsetVec;
if(onGrid(loc)) {
gridded(loc)+=value;
return True;
}
else {
return False;
}
}
// Degrid a value by taking value of nearest neighbour
template <class Domain, class Range>
Bool NNGridder<Domain, Range>::degrid(const Array<Range>& gridded,
const Vector<Domain>& position,
Range& value)
{
loc=location(loc, position);
loc-=offsetVec;
if(onGrid(loc)) {
value=gridded(loc);
return True;
}
else {
return False;
}
}
// Correction factor for 1 dimension. This is the value that
// must be divided to get a correct flux.
template <class Domain, class Range>
Range NNGridder<Domain, Range>::correctionFactor1D(Int loc, Int len)
{
Int offset=loc-len/2;
if(offset!=0) {
Double arg=C::pi*Double(offset)/Double(len);
return sin(arg)/arg;
}
else {
return 1.0;
}
}
} //# NAMESPACE CASACORE - END
#endif
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