HtmPixelization.h

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/*
 * LSST Data Management System
 * Copyright 2016 AURA/LSST.
 *
 * This product includes software developed by the
 * LSST Project (http://www.lsst.org/).
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the LSST License Statement and
 * the GNU General Public License along with this program.  If not,
 * see <https://www.lsstcorp.org/LegalNotices/>.
 */

#ifndef LSST_SPHGEOM_HTMPIXELIZATION_H_
#define LSST_SPHGEOM_HTMPIXELIZATION_H_


#include <cstdint>
#include <stdexcept>

#include "ConvexPolygon.h"
#include "Pixelization.h"


namespace lsst {
namespace sphgeom {

class HtmPixelization : public Pixelization {
public:
    static constexpr int MAX_LEVEL = 24;

    static int level(uint64_t i);

    static ConvexPolygon triangle(uint64_t i);

    static std::string asString(uint64_t i);

    explicit HtmPixelization(int level);

    int getLevel() const { return _level; }

    RangeSet universe() const override {
        return RangeSet(static_cast<uint64_t>(8) << 2 * _level,
                        static_cast<uint64_t>(16) << 2 * _level);
    }

    std::unique_ptr<Region> pixel(uint64_t i) const override {
        return std::unique_ptr<Region>(new ConvexPolygon(triangle(i)));
    }

    uint64_t index(UnitVector3d const &) const override;

    std::string toString(uint64_t i) const override { return asString(i); }

private:
    int _level;

    RangeSet _envelope(Region const &, size_t) const override;
    RangeSet _interior(Region const &, size_t) const override;
};

}} // namespace lsst::sphgeom

#endif // LSST_SPHGEOM_HTMPIXELIZATION_H_