diff options
Diffstat (limited to 'src/include/utils/geo_decls.h')
| -rw-r--r-- | src/include/utils/geo_decls.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/include/utils/geo_decls.h b/src/include/utils/geo_decls.h new file mode 100644 index 0000000..d461755 --- /dev/null +++ b/src/include/utils/geo_decls.h @@ -0,0 +1,180 @@ +/*------------------------------------------------------------------------- + * + * geo_decls.h - Declarations for various 2D constructs. + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/include/utils/geo_decls.h + * + * XXX These routines were not written by a numerical analyst. + * + * XXX I have made some attempt to flesh out the operators + * and data types. There are still some more to do. - tgl 97/04/19 + * + *------------------------------------------------------------------------- + */ +#ifndef GEO_DECLS_H +#define GEO_DECLS_H + +#include "fmgr.h" + +/*-------------------------------------------------------------------- + * Useful floating point utilities and constants. + *------------------------------------------------------------------- + * + * XXX: They are not NaN-aware. + */ + +#define EPSILON 1.0E-06 + +#ifdef EPSILON +#define FPzero(A) (fabs(A) <= EPSILON) +#define FPeq(A,B) (fabs((A) - (B)) <= EPSILON) +#define FPne(A,B) (fabs((A) - (B)) > EPSILON) +#define FPlt(A,B) ((B) - (A) > EPSILON) +#define FPle(A,B) ((A) - (B) <= EPSILON) +#define FPgt(A,B) ((A) - (B) > EPSILON) +#define FPge(A,B) ((B) - (A) <= EPSILON) +#else +#define FPzero(A) ((A) == 0) +#define FPeq(A,B) ((A) == (B)) +#define FPne(A,B) ((A) != (B)) +#define FPlt(A,B) ((A) < (B)) +#define FPle(A,B) ((A) <= (B)) +#define FPgt(A,B) ((A) > (B)) +#define FPge(A,B) ((A) >= (B)) +#endif + +#define HYPOT(A, B) pg_hypot(A, B) + +/*--------------------------------------------------------------------- + * Point - (x,y) + *-------------------------------------------------------------------*/ +typedef struct +{ + float8 x, + y; +} Point; + + +/*--------------------------------------------------------------------- + * LSEG - A straight line, specified by endpoints. + *-------------------------------------------------------------------*/ +typedef struct +{ + Point p[2]; +} LSEG; + + +/*--------------------------------------------------------------------- + * PATH - Specified by vertex points. + *-------------------------------------------------------------------*/ +typedef struct +{ + int32 vl_len_; /* varlena header (do not touch directly!) */ + int32 npts; + int32 closed; /* is this a closed polygon? */ + int32 dummy; /* padding to make it double align */ + Point p[FLEXIBLE_ARRAY_MEMBER]; +} PATH; + + +/*--------------------------------------------------------------------- + * LINE - Specified by its general equation (Ax+By+C=0). + *-------------------------------------------------------------------*/ +typedef struct +{ + float8 A, + B, + C; +} LINE; + + +/*--------------------------------------------------------------------- + * BOX - Specified by two corner points, which are + * sorted to save calculation time later. + *-------------------------------------------------------------------*/ +typedef struct +{ + Point high, + low; /* corner POINTs */ +} BOX; + +/*--------------------------------------------------------------------- + * POLYGON - Specified by an array of doubles defining the points, + * keeping the number of points and the bounding box for + * speed purposes. + *-------------------------------------------------------------------*/ +typedef struct +{ + int32 vl_len_; /* varlena header (do not touch directly!) */ + int32 npts; + BOX boundbox; + Point p[FLEXIBLE_ARRAY_MEMBER]; +} POLYGON; + +/*--------------------------------------------------------------------- + * CIRCLE - Specified by a center point and radius. + *-------------------------------------------------------------------*/ +typedef struct +{ + Point center; + float8 radius; +} CIRCLE; + +/* + * fmgr interface macros + * + * Path and Polygon are toastable varlena types, the others are just + * fixed-size pass-by-reference types. + */ + +#define DatumGetPointP(X) ((Point *) DatumGetPointer(X)) +#define PointPGetDatum(X) PointerGetDatum(X) +#define PG_GETARG_POINT_P(n) DatumGetPointP(PG_GETARG_DATUM(n)) +#define PG_RETURN_POINT_P(x) return PointPGetDatum(x) + +#define DatumGetLsegP(X) ((LSEG *) DatumGetPointer(X)) +#define LsegPGetDatum(X) PointerGetDatum(X) +#define PG_GETARG_LSEG_P(n) DatumGetLsegP(PG_GETARG_DATUM(n)) +#define PG_RETURN_LSEG_P(x) return LsegPGetDatum(x) + +#define DatumGetPathP(X) ((PATH *) PG_DETOAST_DATUM(X)) +#define DatumGetPathPCopy(X) ((PATH *) PG_DETOAST_DATUM_COPY(X)) +#define PathPGetDatum(X) PointerGetDatum(X) +#define PG_GETARG_PATH_P(n) DatumGetPathP(PG_GETARG_DATUM(n)) +#define PG_GETARG_PATH_P_COPY(n) DatumGetPathPCopy(PG_GETARG_DATUM(n)) +#define PG_RETURN_PATH_P(x) return PathPGetDatum(x) + +#define DatumGetLineP(X) ((LINE *) DatumGetPointer(X)) +#define LinePGetDatum(X) PointerGetDatum(X) +#define PG_GETARG_LINE_P(n) DatumGetLineP(PG_GETARG_DATUM(n)) +#define PG_RETURN_LINE_P(x) return LinePGetDatum(x) + +#define DatumGetBoxP(X) ((BOX *) DatumGetPointer(X)) +#define BoxPGetDatum(X) PointerGetDatum(X) +#define PG_GETARG_BOX_P(n) DatumGetBoxP(PG_GETARG_DATUM(n)) +#define PG_RETURN_BOX_P(x) return BoxPGetDatum(x) + +#define DatumGetPolygonP(X) ((POLYGON *) PG_DETOAST_DATUM(X)) +#define DatumGetPolygonPCopy(X) ((POLYGON *) PG_DETOAST_DATUM_COPY(X)) +#define PolygonPGetDatum(X) PointerGetDatum(X) +#define PG_GETARG_POLYGON_P(n) DatumGetPolygonP(PG_GETARG_DATUM(n)) +#define PG_GETARG_POLYGON_P_COPY(n) DatumGetPolygonPCopy(PG_GETARG_DATUM(n)) +#define PG_RETURN_POLYGON_P(x) return PolygonPGetDatum(x) + +#define DatumGetCircleP(X) ((CIRCLE *) DatumGetPointer(X)) +#define CirclePGetDatum(X) PointerGetDatum(X) +#define PG_GETARG_CIRCLE_P(n) DatumGetCircleP(PG_GETARG_DATUM(n)) +#define PG_RETURN_CIRCLE_P(x) return CirclePGetDatum(x) + + +/* + * in geo_ops.c + */ + +extern float8 pg_hypot(float8 x, float8 y); + +#endif /* GEO_DECLS_H */ |