PostGIS  3.0.0dev-r@@SVN_REVISION@@

◆ geography_distance_tree()

Datum geography_distance_tree ( PG_FUNCTION_ARGS  )

Definition at line 341 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().

342 {
343  GSERIALIZED *g1 = NULL;
344  GSERIALIZED *g2 = NULL;
345  double tolerance = 0.0;
346  double distance;
347  bool use_spheroid = true;
348  SPHEROID s;
349 
350  /* Get our geometry objects loaded into memory. */
351  g1 = PG_GETARG_GSERIALIZED_P(0);
352  g2 = PG_GETARG_GSERIALIZED_P(1);
353 
354  /* Return FALSE on empty arguments. */
356  {
357  PG_FREE_IF_COPY(g1, 0);
358  PG_FREE_IF_COPY(g2, 1);
359  PG_RETURN_FLOAT8(0.0);
360  }
361 
362  /* Read our tolerance value. */
363  if ( PG_NARGS() > 2 && ! PG_ARGISNULL(2) )
364  tolerance = PG_GETARG_FLOAT8(2);
365 
366  /* Read our calculation type. */
367  if ( PG_NARGS() > 3 && ! PG_ARGISNULL(3) )
368  use_spheroid = PG_GETARG_BOOL(3);
369 
371 
372  /* Initialize spheroid */
373  spheroid_init_from_srid(fcinfo, gserialized_get_srid(g1), &s);
374 
375  /* Set to sphere if requested */
376  if ( ! use_spheroid )
377  s.a = s.b = s.radius;
378 
379  if ( geography_tree_distance(g1, g2, &s, tolerance, &distance) == LW_FAILURE )
380  {
381  elog(ERROR, "geography_distance_tree failed!");
382  PG_RETURN_NULL();
383  }
384 
385  PG_RETURN_FLOAT8(distance);
386 }
double b
Definition: liblwgeom.h:316
double radius
Definition: liblwgeom.h:320
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:336
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:178
#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:99
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