10c9dc2ac2
Closes https://github.com/postgis/postgis/pull/564/ Closes #4677
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/**********************************************************************
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.net
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*
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* PostGIS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* PostGIS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with PostGIS. If not, see <http://www.gnu.org/licenses/>.
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*
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**********************************************************************
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*
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* ^copyright^
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*
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**********************************************************************/
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#ifndef _LWGEOM_RTREE_H
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#define _LWGEOM_RTREE_H 1
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#include "liblwgeom.h"
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#include "lwgeom_cache.h"
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/**
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* Representation for the y-axis interval spanned by an edge.
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*/
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typedef struct
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{
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double min;
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double max;
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}
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RTREE_INTERVAL;
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/**
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* The following struct and methods are used for a 1D RTree implementation,
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* described at:
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* http://lin-ear-th-inking.blogspot.com/2007/06/packed-1-dimensional-r-tree.html
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*/
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typedef struct rtree_node
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{
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RTREE_INTERVAL *interval;
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struct rtree_node *leftNode;
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struct rtree_node *rightNode;
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LWLINE *segment;
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}
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RTREE_NODE;
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/**
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* The tree structure used for fast P-i-P tests by point_in_multipolygon_rtree()
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*/
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typedef struct
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{
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RTREE_NODE **ringIndices;
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int* ringCounts;
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int polyCount;
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} RTREE_POLY_CACHE;
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typedef struct
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{
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GeomCache gcache;
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RTREE_POLY_CACHE *index;
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} RTreeGeomCache;
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/**
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* Retrieves a collection of line segments given the root and crossing value.
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*/
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LWMLINE *RTreeFindLineSegments(RTREE_NODE *root, double value);
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/**
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* Checks for a cache hit against the provided geometry and returns
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* a pre-built index structure (RTREE_POLY_CACHE) if one exists. Otherwise
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* builds a new one and returns that.
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*/
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RTREE_POLY_CACHE *GetRtreeCache(FunctionCallInfo fcinfo, SHARED_GSERIALIZED *g1);
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#endif /* !defined _LWGEOM_RTREE_H */
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