PostGIS  2.5.0beta1dev-r@@SVN_REVISION@@

◆ optimistic_overlap()

Datum optimistic_overlap ( PG_FUNCTION_ARGS  )

Definition at line 2565 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().

2566 {
2567  GSERIALIZED *pg_geom1 = PG_GETARG_GSERIALIZED_P(0);
2568  GSERIALIZED *pg_geom2 = PG_GETARG_GSERIALIZED_P(1);
2569  double dist = PG_GETARG_FLOAT8(2);
2570  GBOX g1_bvol;
2571  double calc_dist;
2572 
2573  LWGEOM *geom1 = lwgeom_from_gserialized(pg_geom1);
2574  LWGEOM *geom2 = lwgeom_from_gserialized(pg_geom2);
2575 
2576  error_if_srid_mismatch(geom1->srid, geom2->srid);
2577 
2578  if (geom1->type != POLYGONTYPE)
2579  {
2580  elog(ERROR,"optimistic_overlap: first arg isn't a polygon\n");
2581  PG_RETURN_NULL();
2582  }
2583 
2584  if (geom2->type != POLYGONTYPE && geom2->type != MULTIPOLYGONTYPE)
2585  {
2586  elog(ERROR,"optimistic_overlap: 2nd arg isn't a [multi-]polygon\n");
2587  PG_RETURN_NULL();
2588  }
2589 
2590  /*bbox check */
2591  gserialized_get_gbox_p(pg_geom1, &g1_bvol );
2592 
2593  g1_bvol.xmin = g1_bvol.xmin - dist;
2594  g1_bvol.ymin = g1_bvol.ymin - dist;
2595  g1_bvol.xmax = g1_bvol.xmax + dist;
2596  g1_bvol.ymax = g1_bvol.ymax + dist;
2597 
2598  if ( (g1_bvol.xmin > geom2->bbox->xmax) ||
2599  (g1_bvol.xmax < geom2->bbox->xmin) ||
2600  (g1_bvol.ymin > geom2->bbox->ymax) ||
2601  (g1_bvol.ymax < geom2->bbox->ymin) )
2602  {
2603  PG_RETURN_BOOL(false); /*bbox not overlap */
2604  }
2605 
2606  /*
2607  * compute distances
2608  * should be a fast calc if they actually do intersect
2609  */
2610  calc_dist = DatumGetFloat8 ( DirectFunctionCall2(LWGEOM_mindistance2d, PointerGetDatum( pg_geom1 ), PointerGetDatum( pg_geom2 )));
2611 
2612  PG_RETURN_BOOL(calc_dist < dist);
2613 }
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:338
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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