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HtmPixelization.h
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1/*
2 * This file is part of sphgeom.
3 *
4 * Developed for the LSST Data Management System.
5 * This product includes software developed by the LSST Project
6 * (http://www.lsst.org).
7 * See the COPYRIGHT file at the top-level directory of this distribution
8 * for details of code ownership.
9 *
10 * This software is dual licensed under the GNU General Public License and also
11 * under a 3-clause BSD license. Recipients may choose which of these licenses
12 * to use; please see the files gpl-3.0.txt and/or bsd_license.txt,
13 * respectively. If you choose the GPL option then the following text applies
14 * (but note that there is still no warranty even if you opt for BSD instead):
15 *
16 * This program is free software: you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation, either version 3 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
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28 */
29
30#ifndef LSST_SPHGEOM_HTMPIXELIZATION_H_
31#define LSST_SPHGEOM_HTMPIXELIZATION_H_
32
36
37#include <cstdint>
38#include <stdexcept>
39
40#include "ConvexPolygon.h"
41#include "Pixelization.h"
42
43
44namespace lsst {
45namespace sphgeom {
46
58public:
60 static constexpr int MAX_LEVEL = 24;
61
65 static int level(std::uint64_t i);
66
71
84
88 explicit HtmPixelization(int level);
89
91 int getLevel() const { return _level; }
92
93 RangeSet universe() const override {
94 return RangeSet(static_cast<std::uint64_t>(8) << 2 * _level,
95 static_cast<std::uint64_t>(16) << 2 * _level);
96 }
97
101
102 std::uint64_t index(UnitVector3d const &) const override;
103
104 std::string toString(std::uint64_t i) const override { return asString(i); }
105
106private:
107 int _level;
108
109 RangeSet _envelope(Region const &, size_t) const override;
110 RangeSet _interior(Region const &, size_t) const override;
111};
112
113}} // namespace lsst::sphgeom
114
115#endif // LSST_SPHGEOM_HTMPIXELIZATION_H_
This file declares a class for representing convex polygons with great circle edges on the unit spher...
This file defines an interface for pixelizations of the sphere.
ConvexPolygon is a closed convex polygon on the unit sphere.
HtmPixelization provides HTM indexing of points and regions.
int getLevel() const
getLevel returns the subdivision level of this pixelization.
static constexpr int MAX_LEVEL
MAX_LEVEL is the maximum supported HTM subdivision level.
RangeSet _interior(Region const &, size_t) const override
std::unique_ptr< Region > pixel(std::uint64_t i) const override
pixel returns the spherical region corresponding to the pixel with index i.
std::string toString(std::uint64_t i) const override
toString converts the given pixel index to a human-readable string.
RangeSet _envelope(Region const &, size_t) const override
static ConvexPolygon triangle(std::uint64_t i)
triangle returns the triangle corresponding to the given HTM index.
RangeSet universe() const override
universe returns the set of all pixel indexes for this pixelization.
static std::string asString(std::uint64_t i)
asString converts the given HTM index to a human readable string.
static int level(std::uint64_t i)
level returns the subdivision level of the given HTM index.
std::uint64_t index(UnitVector3d const &) const override
index computes the index of the pixel for v.
HtmPixelization(int level)
This constructor creates an HTM pixelization of the sphere with the given subdivision level.
A Pixelization (or partitioning) of the sphere is a mapping between points on the sphere and a set of...
A RangeSet is a set of unsigned 64 bit integers.
Definition RangeSet.h:106
Region is a minimal interface for 2-dimensional regions on the unit sphere.
Definition Region.h:87
UnitVector3d is a unit vector in ℝ³ with components stored in double precision.