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66 lines
3.0 KiB
C
66 lines
3.0 KiB
C
/*
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* Copyright (c) 2013-2014, yinqiwen <yinqiwen@gmail.com>
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* Copyright (c) 2014, Matt Stancliff <matt@genges.com>.
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* Copyright (c) 2015, Salvatore Sanfilippo <antirez@gmail.com>.
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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
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* modification, 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,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* 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"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef GEOHASH_HELPER_HPP_
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#define GEOHASH_HELPER_HPP_
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#include "geohash.h"
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#define GZERO(s) s.bits = s.step = 0;
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#define GISZERO(s) (!s.bits && !s.step)
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#define GISNOTZERO(s) (s.bits || s.step)
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typedef uint64_t GeoHashFix52Bits;
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typedef uint64_t GeoHashVarBits;
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typedef struct {
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GeoHashBits hash;
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GeoHashArea area;
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GeoHashNeighbors neighbors;
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} GeoHashRadius;
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uint8_t geohashEstimateStepsByRadius(double range_meters, double lat);
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int geohashBoundingBox(GeoShape *shape, double *bounds);
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GeoHashRadius geohashCalculateAreasByShapeWGS84(GeoShape *shape);
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GeoHashFix52Bits geohashAlign52Bits(const GeoHashBits hash);
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double geohashGetDistance(double lon1d, double lat1d,
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double lon2d, double lat2d);
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int geohashGetDistanceIfInRadius(double x1, double y1,
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double x2, double y2, double radius,
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double *distance);
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int geohashGetDistanceIfInRadiusWGS84(double x1, double y1, double x2,
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double y2, double radius,
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double *distance);
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int geohashGetDistanceIfInRectangle(double width_m, double height_m, double x1, double y1,
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double x2, double y2, double *distance);
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#endif /* GEOHASH_HELPER_HPP_ */
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