PostGIS  3.0.0dev-r@@SVN_REVISION@@

◆ LWGEOM_startpoint_linestring()

Datum LWGEOM_startpoint_linestring ( PG_FUNCTION_ARGS  )

Definition at line 719 of file lwgeom_ogc.c.

References CIRCSTRINGTYPE, COMPOUNDTYPE, geometry_serialize(), LINETYPE, lwcompound_get_startpoint(), LWGEOM_endpoint_linestring(), lwgeom_free(), lwgeom_from_gserialized(), lwline_get_lwpoint(), lwpoint_as_lwgeom(), PG_FUNCTION_INFO_V1(), ovdump::type, and LWGEOM::type.

Referenced by LWGEOM_m_point().

720 {
721  GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
722  LWGEOM *lwgeom = lwgeom_from_gserialized(geom);
723  LWPOINT *lwpoint = NULL;
724  int type = lwgeom->type;
725 
726  if ( type == LINETYPE || type == CIRCSTRINGTYPE )
727  {
728  lwpoint = lwline_get_lwpoint((LWLINE*)lwgeom, 0);
729  }
730  else if ( type == COMPOUNDTYPE )
731  {
732  lwpoint = lwcompound_get_startpoint((LWCOMPOUND*)lwgeom);
733  }
734 
735  lwgeom_free(lwgeom);
736  PG_FREE_IF_COPY(geom, 0);
737 
738  if ( ! lwpoint )
739  PG_RETURN_NULL();
740 
741  PG_RETURN_POINTER(geometry_serialize(lwpoint_as_lwgeom(lwpoint)));
742 }
#define LINETYPE
Definition: liblwgeom.h:85
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1128
#define COMPOUNDTYPE
Definition: liblwgeom.h:92
LWPOINT * lwcompound_get_startpoint(const LWCOMPOUND *lwcmp)
Definition: lwcompound.c:248
GSERIALIZED * geometry_serialize(LWGEOM *lwgeom)
uint8_t type
Definition: liblwgeom.h:398
type
Definition: ovdump.py:41
LWGEOM * lwpoint_as_lwgeom(const LWPOINT *obj)
Definition: lwgeom.c:326
#define CIRCSTRINGTYPE
Definition: liblwgeom.h:91
LWPOINT * lwline_get_lwpoint(const LWLINE *line, uint32_t where)
Returns freshly allocated LWPOINT that corresponds to the index where.
Definition: lwline.c:318
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