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LSST Data Management Base Package
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SincCoeffs.h
Go to the documentation of this file.
1// -*- lsst-c++ -*-
2/*
3 * LSST Data Management System
4 * Copyright 2008-2014 LSST Corporation.
5 *
6 * This product includes software developed by the
7 * LSST Project (http://www.lsst.org/).
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the LSST License Statement and
20 * the GNU General Public License along with this program. If not,
21 * see <http://www.lsstcorp.org/LegalNotices/>.
22 */
23
24#ifndef LSST_MEAS_BASE_SincCoeffs_h_INCLUDED
25#define LSST_MEAS_BASE_SincCoeffs_h_INCLUDED
26
27#include <map>
28
31
32namespace lsst {
33namespace meas {
34namespace base {
35
44template <typename PixelT>
45class SincCoeffs {
46public:
48
54 static void cache(float rInner, float rOuter);
55
62 get(afw::geom::ellipses::Axes const& outerEllipse, float const innerRadiusFactor = 0.0);
63
66 calculate(afw::geom::ellipses::Axes const& outerEllipse, double const innerFactor = 0.0);
67
68private:
69 // A comparison function that doesn't require equality closer than machine epsilon
70 template <typename T>
71 struct FuzzyCompare {
72 bool operator()(T x, T y) const {
73 if (isEqual(x, y)) {
74 return false;
75 }
76 return (x - y < 0) ? true : false;
77 }
78 bool isEqual(T x, T y) const { return ::fabs(x - y) < std::numeric_limits<T>::epsilon(); }
79 };
80
81 typedef std::map<float, std::shared_ptr<CoeffT>, FuzzyCompare<float> > CoeffMap;
83 SincCoeffs() : _cache(){};
84 SincCoeffs(SincCoeffs const&); // unimplemented: singleton
85 void operator=(SincCoeffs const&); // unimplemented: singleton
86
87 static SincCoeffs& getInstance();
88
89 /*
90 * Search the cache for coefficients for an aperture
91 *
92 * If the coefficients are not cached, a null shared_ptr will be returned.
93 */
94 std::shared_ptr<CoeffT const>
95 _lookup(afw::geom::ellipses::Axes const& outerEllipse, double const innerRadiusFactor = 0.0) const;
96
97 CoeffMapMap _cache; //< Cache of coefficients
98};
99
100} // namespace base
101} // namespace meas
102} // namespace lsst
103
104#endif // !LSST_MEAS_BASE_SincCoeffs_h_INCLUDED
An ellipse core for the semimajor/semiminor axis and position angle parametrization (a,...
Definition Axes.h:47
A class to represent a 2-dimensional array of pixels.
Definition Image.h:51
static std::shared_ptr< CoeffT > calculate(afw::geom::ellipses::Axes const &outerEllipse, double const innerFactor=0.0)
Calculate the coefficients for an aperture.
static void cache(float rInner, float rOuter)
Cache the coefficients for a particular aperture.
static std::shared_ptr< CoeffT const > get(afw::geom::ellipses::Axes const &outerEllipse, float const innerRadiusFactor=0.0)
Get the coefficients for an aperture.
afw::image::Image< PixelT > CoeffT
Definition SincCoeffs.h:47
T epsilon(T... args)