mirror of
https://codeberg.org/redict/redict.git
synced 2025-01-23 08:38:27 -05:00
fa9d62d34f
The GIS standard and all the major DBs implementing GIS related functions take coordinates as x,y that is longitude,latitude. It was a bad start for Redis to do things differently, so even if this means that existing users of the Geo module will be required to change their code, Redis now conforms to the standard. Usually Redis is very backward compatible, but this is not an exception to this rule, since this is the first Geo implementation entering the official Redis source code. It is not wise to try to be backward compatible with code forks... :-) Close #2637.
112 lines
3.8 KiB
C
112 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 2013-2014, yinqiwen <yinqiwen@gmail.com>
|
|
* Copyright (c) 2014, Matt Stancliff <matt@genges.com>.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of Redis nor the names of its contributors may be used
|
|
* to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
|
|
* THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef GEOHASH_H_
|
|
#define GEOHASH_H_
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <stdint.h>
|
|
|
|
#if defined(__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
#define HASHISZERO(r) (!(r).bits && !(r).step)
|
|
#define RANGEISZERO(r) (!(r).max && !(r).min)
|
|
#define RANGEPISZERO(r) (r == NULL || RANGEISZERO(*r))
|
|
|
|
#define GEO_STEP_MAX 26
|
|
|
|
typedef enum {
|
|
GEOHASH_NORTH = 0,
|
|
GEOHASH_EAST,
|
|
GEOHASH_WEST,
|
|
GEOHASH_SOUTH,
|
|
GEOHASH_SOUTH_WEST,
|
|
GEOHASH_SOUTH_EAST,
|
|
GEOHASH_NORT_WEST,
|
|
GEOHASH_NORT_EAST
|
|
} GeoDirection;
|
|
|
|
typedef struct {
|
|
uint64_t bits;
|
|
uint8_t step;
|
|
} GeoHashBits;
|
|
|
|
typedef struct {
|
|
double min;
|
|
double max;
|
|
} GeoHashRange;
|
|
|
|
typedef struct {
|
|
GeoHashBits hash;
|
|
GeoHashRange longitude;
|
|
GeoHashRange latitude;
|
|
} GeoHashArea;
|
|
|
|
typedef struct {
|
|
GeoHashBits north;
|
|
GeoHashBits east;
|
|
GeoHashBits west;
|
|
GeoHashBits south;
|
|
GeoHashBits north_east;
|
|
GeoHashBits south_east;
|
|
GeoHashBits north_west;
|
|
GeoHashBits south_west;
|
|
} GeoHashNeighbors;
|
|
|
|
/*
|
|
* 0:success
|
|
* -1:failed
|
|
*/
|
|
void geohashGetCoordRange(GeoHashRange *long_range, GeoHashRange *lat_range);
|
|
int geohashEncode(GeoHashRange *long_range, GeoHashRange *lat_range,
|
|
double longitude, double latitude, uint8_t step,
|
|
GeoHashBits *hash);
|
|
int geohashEncodeType(double longitude, double latitude,
|
|
uint8_t step, GeoHashBits *hash);
|
|
int geohashEncodeWGS84(double longitude, double latitude, uint8_t step,
|
|
GeoHashBits *hash);
|
|
int geohashDecode(const GeoHashRange long_range, const GeoHashRange lat_range,
|
|
const GeoHashBits hash, GeoHashArea *area);
|
|
int geohashDecodeType(const GeoHashBits hash, GeoHashArea *area);
|
|
int geohashDecodeWGS84(const GeoHashBits hash, GeoHashArea *area);
|
|
int geohashDecodeAreaToLongLat(const GeoHashArea *area, double *xy);
|
|
int geohashDecodeToLongLatType(const GeoHashBits hash, double *xy);
|
|
int geohashDecodeToLongLatWGS84(const GeoHashBits hash, double *xy);
|
|
int geohashDecodeToLongLatMercator(const GeoHashBits hash, double *xy);
|
|
void geohashNeighbors(const GeoHashBits *hash, GeoHashNeighbors *neighbors);
|
|
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
#endif /* GEOHASH_H_ */
|