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77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
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/*
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* geohash.h
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* libgeohash
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*
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* Created by Derek Smith on 10/6/09.
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* Copyright (c) 2010, SimpleGeo
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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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* Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer. Redistributions in binary form must
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* reproduce the above copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided with the distribution.
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* Neither the name of the SimpleGeo nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// Metric in meters
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typedef struct GeoBoxDimensionStruct {
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double height;
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double width;
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} GeoBoxDimension;
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typedef struct GeoCoordStruct {
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double latitude;
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double longitude;
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double north;
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double east;
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double south;
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double west;
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GeoBoxDimension dimension;
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} GeoCoord;
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/*
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* Creates a the hash at the specified precision. If precision is set to 0.
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* or less than it defaults to 12.
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*/
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extern char* geohash_encode(double lat, double lng, int precision);
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/*
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* Returns the latitude and longitude used to create the hash along with
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* the bounding box for the encoded coordinate.
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*/
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extern GeoCoord geohash_decode(char* hash);
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/*
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* Return an array of geohashes that represent the neighbors of the passed
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* in value. The neighbors are indexed as followed:
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*
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* N, NE, E, SE, S, SW, W, NW
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* 0, 1, 2, 3, 4, 5, 6, 7
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*/
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extern char** geohash_neighbors(char* hash);
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/*
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* Returns the width and height of a precision value.
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*/
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extern GeoBoxDimension geohash_dimensions_for_precision(int precision);
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