mirror of https://gitee.com/bigwinds/arangodb
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// @brief geo index
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2010-2011 triagens GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author R. A. Parker
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/// @author Copyright 2011, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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/* GeoIndex.h - header file for GeoIndex algorithms */
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/* Version 2.0 3.12.2011 R. A. Parker */
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#ifdef GEO_TRIAGENS
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#include <Basics/Common.h>
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#else
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#endif
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/* first the things that a user might want to change */
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/* a GeoString - a signed type of at least 64 bits */
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typedef long long GeoString;
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/* percentage growth of slot or slotslot tables */
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#define GeoIndexGROW 10
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/* maximum number of points in a pot >=2 */
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#define GeoIndexPOTSIZE 6
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/* number of fixed points for max-dist calculations */
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#define GeoIndexFIXEDPOINTS 8
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typedef unsigned short GeoFix;
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/* If this #define is there, then the INDEXDUMP and */
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/* INDEXVALID functions are also available. These */
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/* are not needed for normal production versions */
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/* the INDEXDUMP function also prints the data, */
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/* assumed to be a character string, if DEBUG is */
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/* set to 2. */
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#define DEBUG 1
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typedef struct
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{
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double latitude;
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double longitude;
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void * data;
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} GeoCoordinate;
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typedef struct
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{
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size_t length;
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GeoCoordinate * coordinates;
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double * distances;
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} GeoCoordinates;
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typedef struct
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{
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double x[GeoIndexFIXEDPOINTS];
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double y[GeoIndexFIXEDPOINTS];
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double z[GeoIndexFIXEDPOINTS];
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} GeoIndexFixed;
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typedef struct
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{
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int LorLeaf;
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int RorPoints;
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GeoString middle;
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GeoFix maxdist[GeoIndexFIXEDPOINTS];
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GeoString start;
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GeoString end;
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int level;
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int points[GeoIndexPOTSIZE];
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} GeoPot;
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typedef struct
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{
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GeoIndexFixed fixed; /* fixed point data */
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int potct; /* pots allocated */
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int slotct; /* slots allocated */
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GeoPot * pots; /* the pots themselves */
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GeoCoordinate * gc; /* the slots themselves */
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} GeoIndex;
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GeoIndex * GeoIndex_new(void);
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void GeoIndex_free(GeoIndex * gi);
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double GeoIndex_distance(GeoCoordinate * c1, GeoCoordinate * c2);
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int GeoIndex_insert(GeoIndex * gi, GeoCoordinate * c);
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int GeoIndex_remove(GeoIndex * gi, GeoCoordinate * c);
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int GeoIndex_hint(GeoIndex * gi, int hint);
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GeoCoordinates * GeoIndex_PointsWithinRadius(GeoIndex * gi,
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GeoCoordinate * c, double d);
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GeoCoordinates * GeoIndex_NearestCountPoints(GeoIndex * gi,
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GeoCoordinate * c, int count);
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void GeoIndex_CoordinatesFree(GeoCoordinates * clist);
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#ifdef DEBUG
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void GeoIndex_INDEXDUMP(GeoIndex * gi, FILE * f);
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int GeoIndex_INDEXVALID(GeoIndex * gi);
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#endif
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/* end of GeoIndex.h */
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