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61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
// SPDX-License-Identifier: BSD-3-Clause
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/**
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* Copyright (c) MapBox
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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* - Neither the name "MapBox" nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __MAPNIK_VECTOR_TILE_PROJECTION_H__
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#define __MAPNIK_VECTOR_TILE_PROJECTION_H__
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// mapnik
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#include <mapnik/geometry/box2d.hpp>
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#include <mapnik/well_known_srs.hpp>
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namespace mapnik
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{
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namespace vector_tile_impl
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{
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inline mapnik::box2d<double> tile_mercator_bbox(std::uint64_t x,
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std::uint64_t y,
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std::uint64_t z)
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{
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const double half_of_equator = M_PI * EARTH_RADIUS;
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const double tile_size = 2.0 * half_of_equator / (1ull << z);
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double minx = -half_of_equator + x * tile_size;
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double miny = half_of_equator - (y + 1.0) * tile_size;
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double maxx = -half_of_equator + (x + 1.0) * tile_size;
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double maxy = half_of_equator - y * tile_size;
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return mapnik::box2d<double>(minx,miny,maxx,maxy);
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}
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} // end vector_tile_impl ns
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} // end mapnik ns
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#endif // __MAPNIK_VECTOR_TILE_PROJECTION_H__
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