PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ LWGEOM_y_point()

Datum LWGEOM_y_point ( PG_FUNCTION_ARGS  )

Definition at line 622 of file lwgeom_ogc.c.

References getPoint2d_p(), gserialized_get_type(), lwgeom_as_lwpoint(), lwgeom_from_gserialized(), lwgeom_is_empty(), LWGEOM_z_point(), PG_FUNCTION_INFO_V1(), LWPOINT::point, POINTTYPE, and POINT2D::y.

Referenced by LWGEOM_x_point().

623 {
624  GSERIALIZED *geom;
625  LWPOINT *point = NULL;
626  LWGEOM *lwgeom;
627  POINT2D p;
628 
629  geom = PG_GETARG_GSERIALIZED_P(0);
630 
631  if ( gserialized_get_type(geom) != POINTTYPE )
632  lwpgerror("Argument to ST_Y() must be a point");
633 
634  lwgeom = lwgeom_from_gserialized(geom);
635  point = lwgeom_as_lwpoint(lwgeom);
636 
637  if ( lwgeom_is_empty(lwgeom) )
638  PG_RETURN_NULL();
639 
640  getPoint2d_p(point->point, 0, &p);
641 
642  PG_FREE_IF_COPY(geom, 0);
643 
644  PG_RETURN_FLOAT8(p.y);
645 }
uint32_t gserialized_get_type(const GSERIALIZED *s)
Extract the geometry type from the serialized form (it hides in the anonymous data area...
Definition: g_serialized.c:86
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
LWPOINT * lwgeom_as_lwpoint(const LWGEOM *lwgeom)
Definition: lwgeom.c:161
POINTARRAY * point
Definition: liblwgeom.h:413
double y
Definition: liblwgeom.h:330
int getPoint2d_p(const POINTARRAY *pa, uint32_t n, POINT2D *point)
Definition: lwgeom_api.c:338
#define POINTTYPE
LWTYPE numbers, used internally by PostGIS.
Definition: liblwgeom.h:84
int lwgeom_is_empty(const LWGEOM *geom)
Return true or false depending on whether a geometry is an "empty" geometry (no vertices members) ...
Definition: lwgeom.c:1393
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