PostGIS  2.5.2dev-r@@SVN_REVISION@@

◆ geography_distance_tree()

Datum geography_distance_tree ( PG_FUNCTION_ARGS  )

Definition at line 342 of file geography_measurement.c.

References SPHEROID::a, SPHEROID::b, distance(), error_if_srid_mismatch(), geography_dwithin_uncached(), geography_tree_distance(), gserialized_get_srid(), gserialized_is_empty(), LW_FAILURE, PG_FUNCTION_INFO_V1(), SPHEROID::radius, and s.

Referenced by geography_dwithin().

343 {
344  GSERIALIZED *g1 = NULL;
345  GSERIALIZED *g2 = NULL;
346  double tolerance = 0.0;
347  double distance;
348  bool use_spheroid = true;
349  SPHEROID s;
350 
351  /* Get our geometry objects loaded into memory. */
352  g1 = PG_GETARG_GSERIALIZED_P(0);
353  g2 = PG_GETARG_GSERIALIZED_P(1);
354 
355  /* Return FALSE on empty arguments. */
357  {
358  PG_FREE_IF_COPY(g1, 0);
359  PG_FREE_IF_COPY(g2, 1);
360  PG_RETURN_FLOAT8(0.0);
361  }
362 
363  /* Read our tolerance value. */
364  if ( PG_NARGS() > 2 && ! PG_ARGISNULL(2) )
365  tolerance = PG_GETARG_FLOAT8(2);
366 
367  /* Read our calculation type. */
368  if ( PG_NARGS() > 3 && ! PG_ARGISNULL(3) )
369  use_spheroid = PG_GETARG_BOOL(3);
370 
372 
373  /* Initialize spheroid */
374  spheroid_init_from_srid(fcinfo, gserialized_get_srid(g1), &s);
375 
376  /* Set to sphere if requested */
377  if ( ! use_spheroid )
378  s.a = s.b = s.radius;
379 
380  if ( geography_tree_distance(g1, g2, &s, tolerance, &distance) == LW_FAILURE )
381  {
382  elog(ERROR, "geography_distance_tree failed!");
383  PG_RETURN_NULL();
384  }
385 
386  PG_RETURN_FLOAT8(distance);
387 }
double b
Definition: liblwgeom.h:316
double radius
Definition: liblwgeom.h:320
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:338
int geography_tree_distance(const GSERIALIZED *g1, const GSERIALIZED *g2, const SPHEROID *s, double tolerance, double *distance)
int gserialized_is_empty(const GSERIALIZED *g)
Check if a GSERIALIZED is empty without deserializing first.
Definition: g_serialized.c:179
#define LW_FAILURE
Definition: liblwgeom.h:78
char * s
Definition: cu_in_wkt.c:23
Datum distance(PG_FUNCTION_ARGS)
double a
Definition: liblwgeom.h:315
int32_t gserialized_get_srid(const GSERIALIZED *s)
Extract the SRID from the serialized form (it is packed into three bytes so this is a handy function)...
Definition: g_serialized.c:100
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