mirror of https://gitee.com/bigwinds/arangodb
115 lines
4.0 KiB
C
115 lines
4.0 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 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 ArangoDB GmbH, Cologne, Germany
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///
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/// @author R. A. Parker
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////////////////////////////////////////////////////////////////////////////////
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/* GeoIndex.h - header file for GeoIndex algorithms */
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/* Version 2.2 25.11.2015 R. A. Parker */
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#ifndef ARANGOD_GEO_INDEX_GEO_INDEX_H
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#define ARANGOD_GEO_INDEX_GEO_INDEX_H 1
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#include "Basics/Common.h"
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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 50
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/* maximum number of points in a pot */
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/* *** note - must be even! */
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/* smaller takes more space but is a little faster */
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#define GeoIndexPOTSIZE 6
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/* choses the set of fixed points */
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#define GeoIndexFIXEDSET 6
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/* 1 is just the N pole (doesn't really work) */
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/* 2 is N and S pole - slow but OK */
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/* 3 is equilateral triangle on 0/180 long */
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/* 4 is four corners of a tetrahedron */
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/* 5 is trigonal bipyramid */
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/* 6 is the corners of octahedron (default) */
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/* 8 is eight corners of a cube */
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/* size of max-dist integer. */
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/* 2 is 16-bit - smaller but slow when lots of points */
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/* within a few hundred meters of target */
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/* 4 is 32-bit - larger and fast even when points are */
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/* only centimeters apart. Default */
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#define GEOFIXLEN 4
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#if GEOFIXLEN == 2
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typedef unsigned short GeoFix;
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#endif
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#if GEOFIXLEN == 4
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typedef unsigned int GeoFix;
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#endif
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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 TRI_GEO_DEBUG 1
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typedef struct {
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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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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 void GeoIndex; /* to keep the structure private */
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typedef void GeoCursor; /* to keep the structure private */
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size_t GeoIndex_MemoryUsage(void*);
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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, GeoCoordinate* c,
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double d);
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GeoCoordinates* GeoIndex_NearestCountPoints(GeoIndex* gi, GeoCoordinate* c,
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int count);
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GeoCursor* GeoIndex_NewCursor(GeoIndex* gi, GeoCoordinate* c);
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GeoCoordinates* GeoIndex_ReadCursor(GeoCursor* gc, int count);
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void GeoIndex_CursorFree(GeoCursor* gc);
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void GeoIndex_CoordinatesFree(GeoCoordinates* clist);
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#ifdef TRI_GEO_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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#endif
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/* end of GeoIndex.h */
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