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118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/*
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** 2010 August 30
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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*/
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#ifndef _SQLITE3RTREE_H_
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#define _SQLITE3RTREE_H_
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#include <sqlite3.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct sqlite3_rtree_geometry sqlite3_rtree_geometry;
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typedef struct sqlite3_rtree_query_info sqlite3_rtree_query_info;
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/* The double-precision datatype used by RTree depends on the
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** SQLITE_RTREE_INT_ONLY compile-time option.
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*/
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#ifdef SQLITE_RTREE_INT_ONLY
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typedef sqlite3_int64 sqlite3_rtree_dbl;
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#else
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typedef double sqlite3_rtree_dbl;
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#endif
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/*
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** Register a geometry callback named zGeom that can be used as part of an
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** R-Tree geometry query as follows:
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**
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** SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
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*/
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int sqlite3_rtree_geometry_callback(
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sqlite3 *db,
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const char *zGeom,
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int (*xGeom)(sqlite3_rtree_geometry*, int, sqlite3_rtree_dbl*,int*),
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void *pContext
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);
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/*
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** A pointer to a structure of the following type is passed as the first
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** argument to callbacks registered using rtree_geometry_callback().
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*/
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struct sqlite3_rtree_geometry {
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void *pContext; /* Copy of pContext passed to s_r_g_c() */
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int nParam; /* Size of array aParam[] */
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sqlite3_rtree_dbl *aParam; /* Parameters passed to SQL geom function */
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void *pUser; /* Callback implementation user data */
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void (*xDelUser)(void *); /* Called by SQLite to clean up pUser */
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};
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/*
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** Register a 2nd-generation geometry callback named zScore that can be
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** used as part of an R-Tree geometry query as follows:
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**
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** SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zQueryFunc(... params ...)
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*/
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int sqlite3_rtree_query_callback(
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sqlite3 *db,
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const char *zQueryFunc,
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int (*xQueryFunc)(sqlite3_rtree_query_info*),
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void *pContext,
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void (*xDestructor)(void*)
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);
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/*
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** A pointer to a structure of the following type is passed as the
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** argument to scored geometry callback registered using
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** sqlite3_rtree_query_callback().
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**
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** Note that the first 5 fields of this structure are identical to
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** sqlite3_rtree_geometry. This structure is a subclass of
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** sqlite3_rtree_geometry.
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*/
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struct sqlite3_rtree_query_info {
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void *pContext; /* pContext from when function registered */
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int nParam; /* Number of function parameters */
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sqlite3_rtree_dbl *aParam; /* value of function parameters */
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void *pUser; /* callback can use this, if desired */
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void (*xDelUser)(void*); /* function to free pUser */
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sqlite3_rtree_dbl *aCoord; /* Coordinates of node or entry to check */
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unsigned int *anQueue; /* Number of pending entries in the queue */
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int nCoord; /* Number of coordinates */
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int iLevel; /* Level of current node or entry */
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int mxLevel; /* The largest iLevel value in the tree */
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sqlite3_int64 iRowid; /* Rowid for current entry */
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sqlite3_rtree_dbl rParentScore; /* Score of parent node */
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int eParentWithin; /* Visibility of parent node */
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int eWithin; /* OUT: Visibility */
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sqlite3_rtree_dbl rScore; /* OUT: Write the score here */
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/* The following fields are only available in 3.8.11 and later */
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sqlite3_value **apSqlParam; /* Original SQL values of parameters */
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};
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/*
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** Allowed values for sqlite3_rtree_query.eWithin and .eParentWithin.
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*/
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#define NOT_WITHIN 0 /* Object completely outside of query region */
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#define PARTLY_WITHIN 1 /* Object partially overlaps query region */
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#define FULLY_WITHIN 2 /* Object fully contained within query region */
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#ifdef __cplusplus
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} /* end of the 'extern "C"' block */
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#endif
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#endif /* ifndef _SQLITE3RTREE_H_ */
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