PostGIS  2.2.7dev-r@@SVN_REVISION@@
Datum geography_distance_tree ( PG_FUNCTION_ARGS  )

Definition at line 328 of file geography_measurement.c.

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

329 {
330  GSERIALIZED *g1 = NULL;
331  GSERIALIZED *g2 = NULL;
332  double tolerance = 0.0;
333  double distance;
334  bool use_spheroid = true;
335  SPHEROID s;
336 
337  /* Get our geometry objects loaded into memory. */
338  g1 = PG_GETARG_GSERIALIZED_P(0);
339  g2 = PG_GETARG_GSERIALIZED_P(1);
340 
341  /* Return FALSE on empty arguments. */
343  {
344  PG_FREE_IF_COPY(g1, 0);
345  PG_FREE_IF_COPY(g2, 1);
346  PG_RETURN_FLOAT8(0.0);
347  }
348 
349  /* Read our tolerance value. */
350  if ( PG_NARGS() > 2 && ! PG_ARGISNULL(2) )
351  tolerance = PG_GETARG_FLOAT8(2);
352 
353  /* Read our calculation type. */
354  if ( PG_NARGS() > 3 && ! PG_ARGISNULL(3) )
355  use_spheroid = PG_GETARG_BOOL(3);
356 
358 
359  /* Initialize spheroid */
360  spheroid_init_from_srid(fcinfo, gserialized_get_srid(g1), &s);
361 
362  /* Set to sphere if requested */
363  if ( ! use_spheroid )
364  s.a = s.b = s.radius;
365 
366  if ( geography_tree_distance(g1, g2, &s, tolerance, &distance) == LW_FAILURE )
367  {
368  elog(ERROR, "geography_distance_tree failed!");
369  PG_RETURN_NULL();
370  }
371 
372  PG_RETURN_FLOAT8(distance);
373 }
double b
Definition: liblwgeom.h:298
double radius
Definition: liblwgeom.h:302
void error_if_srid_mismatch(int srid1, int srid2)
Definition: lwutil.c:341
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:139
#define LW_FAILURE
Definition: liblwgeom.h:64
char * s
Definition: cu_in_wkt.c:23
Datum distance(PG_FUNCTION_ARGS)
double a
Definition: liblwgeom.h:297
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:69

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