PostGIS  3.0.0dev-r@@SVN_REVISION@@

◆ optimistic_overlap()

Datum optimistic_overlap ( PG_FUNCTION_ARGS  )

Definition at line 2564 of file lwgeom_functions_basic.c.

References LWGEOM::bbox, error_if_srid_mismatch(), gserialized_get_gbox_p(), LWGEOM_affine(), lwgeom_from_gserialized(), LWGEOM_mindistance2d(), MULTIPOLYGONTYPE, PG_FUNCTION_INFO_V1(), POLYGONTYPE, LWGEOM::srid, LWGEOM::type, GBOX::xmax, GBOX::xmin, GBOX::ymax, and GBOX::ymin.

Referenced by LWGEOM_angle().

2565 {
2566  GSERIALIZED *pg_geom1 = PG_GETARG_GSERIALIZED_P(0);
2567  GSERIALIZED *pg_geom2 = PG_GETARG_GSERIALIZED_P(1);
2568  double dist = PG_GETARG_FLOAT8(2);
2569  GBOX g1_bvol;
2570  double calc_dist;
2571 
2572  LWGEOM *geom1 = lwgeom_from_gserialized(pg_geom1);
2573  LWGEOM *geom2 = lwgeom_from_gserialized(pg_geom2);
2574 
2575  error_if_srid_mismatch(geom1->srid, geom2->srid);
2576 
2577  if (geom1->type != POLYGONTYPE)
2578  {
2579  elog(ERROR,"optimistic_overlap: first arg isn't a polygon\n");
2580  PG_RETURN_NULL();
2581  }
2582 
2583  if (geom2->type != POLYGONTYPE && geom2->type != MULTIPOLYGONTYPE)
2584  {
2585  elog(ERROR,"optimistic_overlap: 2nd arg isn't a [multi-]polygon\n");
2586  PG_RETURN_NULL();
2587  }
2588 
2589  /*bbox check */
2590  gserialized_get_gbox_p(pg_geom1, &g1_bvol );
2591 
2592  g1_bvol.xmin = g1_bvol.xmin - dist;
2593  g1_bvol.ymin = g1_bvol.ymin - dist;
2594  g1_bvol.xmax = g1_bvol.xmax + dist;
2595  g1_bvol.ymax = g1_bvol.ymax + dist;
2596 
2597  if ( (g1_bvol.xmin > geom2->bbox->xmax) ||
2598  (g1_bvol.xmax < geom2->bbox->xmin) ||
2599  (g1_bvol.ymin > geom2->bbox->ymax) ||
2600  (g1_bvol.ymax < geom2->bbox->ymin) )
2601  {
2602  PG_RETURN_BOOL(false); /*bbox not overlap */
2603  }
2604 
2605  /*
2606  * compute distances
2607  * should be a fast calc if they actually do intersect
2608  */
2609  calc_dist = DatumGetFloat8 ( DirectFunctionCall2(LWGEOM_mindistance2d, PointerGetDatum( pg_geom1 ), PointerGetDatum( pg_geom2 )));
2610 
2611  PG_RETURN_BOOL(calc_dist < dist);
2612 }
int gserialized_get_gbox_p(const GSERIALIZED *g, GBOX *box)
Read the bounding box off a serialization and calculate one if it is not already there.
Definition: g_serialized.c:639
GBOX * bbox
Definition: liblwgeom.h:400
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
#define POLYGONTYPE
Definition: liblwgeom.h:86
double xmax
Definition: liblwgeom.h:295
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:336
int32_t srid
Definition: liblwgeom.h:401
double ymin
Definition: liblwgeom.h:296
double xmin
Definition: liblwgeom.h:294
double ymax
Definition: liblwgeom.h:297
#define MULTIPOLYGONTYPE
Definition: liblwgeom.h:89
Datum LWGEOM_mindistance2d(PG_FUNCTION_ARGS)
uint8_t type
Definition: liblwgeom.h:398
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