PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ lwpoly_from_lwlines()

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

Definition at line 328 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().

330 {
331  uint32_t nrings;
332  POINTARRAY **rings = lwalloc((nholes+1)*sizeof(POINTARRAY *));
333  int srid = shell->srid;
334  LWPOLY *ret;
335 
336  if ( shell->points->npoints < 4 )
337  lwerror("lwpoly_from_lwlines: shell must have at least 4 points");
338  if ( ! ptarray_is_closed_2d(shell->points) )
339  lwerror("lwpoly_from_lwlines: shell must be closed");
340  rings[0] = ptarray_clone_deep(shell->points);
341 
342  for (nrings=1; nrings<=nholes; nrings++)
343  {
344  const LWLINE *hole = holes[nrings-1];
345 
346  if ( hole->srid != srid )
347  lwerror("lwpoly_from_lwlines: mixed SRIDs in input lines");
348 
349  if ( hole->points->npoints < 4 )
350  lwerror("lwpoly_from_lwlines: holes must have at least 4 points");
351  if ( ! ptarray_is_closed_2d(hole->points) )
352  lwerror("lwpoly_from_lwlines: holes must be closed");
353 
354  rings[nrings] = ptarray_clone_deep(hole->points);
355  }
356 
357  ret = lwpoly_construct(srid, NULL, nrings, rings);
358  return ret;
359 }
int npoints
Definition: liblwgeom.h:370
int32_t srid
Definition: liblwgeom.h:420
int ptarray_is_closed_2d(const POINTARRAY *pa)
Definition: ptarray.c:701
LWPOLY * lwpoly_construct(int srid, GBOX *bbox, uint32_t nrings, POINTARRAY **points)
Definition: lwpoly.c:43
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:227
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:102
POINTARRAY * points
Definition: liblwgeom.h:421
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