PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ lwpoly_from_lwlines()

LWPOLY* lwpoly_from_lwlines ( const LWLINE shell,
uint32_t  nholes,
const LWLINE **  holes 
)

Definition at line 255 of file lwpoly.c.

References lwalloc(), lwerror(), lwpoly_construct(), POINTARRAY::npoints, LWLINE::points, ptarray_clone_deep(), ptarray_is_closed_2d(), and LWLINE::srid.

Referenced by lwgeom_force_sfs(), and LWGEOM_makepoly().

257 {
258  uint32_t nrings;
259  POINTARRAY **rings = lwalloc((nholes+1)*sizeof(POINTARRAY *));
260  int srid = shell->srid;
261  LWPOLY *ret;
262 
263  if ( shell->points->npoints < 4 )
264  lwerror("lwpoly_from_lwlines: shell must have at least 4 points");
265  if ( ! ptarray_is_closed_2d(shell->points) )
266  lwerror("lwpoly_from_lwlines: shell must be closed");
267  rings[0] = ptarray_clone_deep(shell->points);
268 
269  for (nrings=1; nrings<=nholes; nrings++)
270  {
271  const LWLINE *hole = holes[nrings-1];
272 
273  if ( hole->srid != srid )
274  lwerror("lwpoly_from_lwlines: mixed SRIDs in input lines");
275 
276  if ( hole->points->npoints < 4 )
277  lwerror("lwpoly_from_lwlines: holes must have at least 4 points");
278  if ( ! ptarray_is_closed_2d(hole->points) )
279  lwerror("lwpoly_from_lwlines: holes must be closed");
280 
281  rings[nrings] = ptarray_clone_deep(hole->points);
282  }
283 
284  ret = lwpoly_construct(srid, NULL, nrings, rings);
285  return ret;
286 }
int npoints
Definition: liblwgeom.h:355
int32_t srid
Definition: liblwgeom.h:405
int ptarray_is_closed_2d(const POINTARRAY *pa)
Definition: ptarray.c:694
LWPOLY * lwpoly_construct(int srid, GBOX *bbox, uint32_t nrings, POINTARRAY **points)
Definition: lwpoly.c:29
POINTARRAY * ptarray_clone_deep(const POINTARRAY *ptarray)
Deep clone a pointarray (also clones serialized pointlist)
Definition: ptarray.c:634
void * lwalloc(size_t size)
Definition: lwutil.c:199
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:74
POINTARRAY * points
Definition: liblwgeom.h:406
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