PostGIS  3.7.0dev-r@@SVN_REVISION@@

◆ ST_IsPolygonCW()

Datum ST_IsPolygonCW ( PG_FUNCTION_ARGS  )

Definition at line 869 of file lwgeom_functions_analytic.c.

870 {
871  GSERIALIZED* geom;
872 
873  if (PG_ARGISNULL(0))
874  PG_RETURN_NULL();
875 
876  geom = PG_GETARG_GSERIALIZED_P(0);
877  PG_RETURN_BOOL(lwgeom_has_orientation(lwgeom_from_gserialized(geom), LW_CLOCKWISE));
878 }
lwgeom_from_gserialized
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
Definition: gserialized.c:268
lwgeom_has_orientation
int lwgeom_has_orientation(const LWGEOM *lwgeom, int orientation)
Tests that geometry is oriented LW_CLOCKWISE or LW_COUNTERCLOCKWISE.
Definition: lwgeom.c:93
LW_CLOCKWISE
#define LW_CLOCKWISE
Constants for orientation checking and forcing.
Definition: liblwgeom_internal.h:163

References LW_CLOCKWISE, lwgeom_from_gserialized(), and lwgeom_has_orientation().

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