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LSST Data Management Base Package
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ImageUtils.h
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1// -*- lsst-c++ -*-
2
3/*
4 * LSST Data Management System
5 * Copyright 2008, 2009, 2010 LSST Corporation.
6 *
7 * This product includes software developed by the
8 * LSST Project (http://www.lsst.org/).
9 *
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the LSST License Statement and
21 * the GNU General Public License along with this program. If not,
22 * see <http://www.lsstcorp.org/LegalNotices/>.
23 */
24
25/*
26 * Image utility functions
27 */
28#ifndef LSST_AFW_IMAGE_IMAGEUTILS_H
29#define LSST_AFW_IMAGE_IMAGEUTILS_H
30
31#include <cmath>
32
33namespace lsst {
34namespace afw {
35namespace image {
36enum xOrY { X, Y };
37
44const double PixelZeroPos = 0.0;
45
55inline double indexToPosition(double ind
56) {
57 return ind + PixelZeroPos;
58}
59
69inline int positionToIndex(double pos
70) {
71 return static_cast<int>(std::floor(pos + 0.5 - PixelZeroPos));
72}
73
85inline int positionToIndex(double &residual,
86 double pos
87) {
88 double fullIndex = pos - PixelZeroPos;
89 double roundedIndex = std::floor(fullIndex + 0.5);
90 residual = fullIndex - roundedIndex;
91 return static_cast<int>(roundedIndex);
92}
98inline std::pair<int, double> positionToIndex(double const pos,
99 bool
100) {
101 double residual; // fractional part of index
102 int const ind = positionToIndex(residual, pos); // integral part
103
104 return std::pair<int, double>(ind, residual);
105}
106} // namespace image
107} // namespace afw
108} // namespace lsst
109
110#endif // LSST_AFW_IMAGE_IMAGEUTILS_H
T floor(T... args)
const double PixelZeroPos
position of center of pixel 0
Definition ImageUtils.h:44
double indexToPosition(double ind)
Convert image index to image position.
Definition ImageUtils.h:55
int positionToIndex(double pos)
Convert image position to nearest integer index.
Definition ImageUtils.h:69