PostGIS  2.3.7dev-r@@SVN_REVISION@@
Datum LWGEOM_makepoly ( PG_FUNCTION_ARGS  )

Definition at line 1532 of file lwgeom_functions_basic.c.

References geometry_serialize(), gserialized_get_type(), LINETYPE, lwalloc(), lwgeom_as_lwline(), lwgeom_from_gserialized(), lwgeom_summary(), lwline_free(), and lwpoly_from_lwlines().

1533 {
1534  GSERIALIZED *pglwg1;
1535  ArrayType *array=NULL;
1536  GSERIALIZED *result=NULL;
1537  const LWLINE *shell=NULL;
1538  const LWLINE **holes=NULL;
1539  LWPOLY *outpoly;
1540  uint32 nholes=0;
1541  uint32 i;
1542  size_t offset=0;
1543 
1544  POSTGIS_DEBUG(2, "LWGEOM_makepoly called.");
1545 
1546  /* Get input shell */
1547  pglwg1 = PG_GETARG_GSERIALIZED_P(0);
1548  if ( gserialized_get_type(pglwg1) != LINETYPE )
1549  {
1550  lwpgerror("Shell is not a line");
1551  }
1552  shell = lwgeom_as_lwline(lwgeom_from_gserialized(pglwg1));
1553 
1554  /* Get input holes if any */
1555  if ( PG_NARGS() > 1 )
1556  {
1557  array = PG_GETARG_ARRAYTYPE_P(1);
1558  nholes = ArrayGetNItems(ARR_NDIM(array), ARR_DIMS(array));
1559  holes = lwalloc(sizeof(LWLINE *)*nholes);
1560  for (i=0; i<nholes; i++)
1561  {
1562  GSERIALIZED *g = (GSERIALIZED *)(ARR_DATA_PTR(array)+offset);
1563  LWLINE *hole;
1564  offset += INTALIGN(VARSIZE(g));
1565  if ( gserialized_get_type(g) != LINETYPE )
1566  {
1567  lwpgerror("Hole %d is not a line", i);
1568  }
1570  holes[i] = hole;
1571  }
1572  }
1573 
1574  outpoly = lwpoly_from_lwlines(shell, nholes, holes);
1575  POSTGIS_DEBUGF(3, "%s", lwgeom_summary((LWGEOM*)outpoly, 0));
1576  result = geometry_serialize((LWGEOM *)outpoly);
1577 
1578  lwline_free((LWLINE*)shell);
1579  PG_FREE_IF_COPY(pglwg1, 0);
1580 
1581  for (i=0; i<nholes; i++)
1582  {
1583  lwline_free((LWLINE*)holes[i]);
1584  }
1585 
1586  PG_RETURN_POINTER(result);
1587 }
#define LINETYPE
Definition: liblwgeom.h:85
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:69
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwline_free(LWLINE *line)
Definition: lwline.c:76
LWLINE * lwgeom_as_lwline(const LWGEOM *lwgeom)
Definition: lwgeom.c:102
LWPOLY * lwpoly_from_lwlines(const LWLINE *shell, uint32_t nholes, const LWLINE **holes)
Definition: lwpoly.c:326
GSERIALIZED * geometry_serialize(LWGEOM *lwgeom)
void * lwalloc(size_t size)
Definition: lwutil.c:227
char * lwgeom_summary(const LWGEOM *lwgeom, int offset)
Definition: lwgeom_debug.c:158

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