PostGIS  2.3.7dev-r@@SVN_REVISION@@
int lwgeom_is_closed ( const LWGEOM geom)

Return true or false depending on whether a geometry is a linear feature that closes on itself.

Definition at line 960 of file lwgeom.c.

References CIRCSTRINGTYPE, COMPOUNDTYPE, LWCOLLECTION::geoms, LINETYPE, LW_FALSE, LW_TRUE, lwcircstring_is_closed(), lwcompound_is_closed(), lwgeom_as_lwcollection(), lwgeom_is_collection(), lwgeom_is_empty(), lwline_is_closed(), lwpoly_is_closed(), lwpsurface_is_closed(), lwtin_is_closed(), LWCOLLECTION::ngeoms, POLYGONTYPE, POLYHEDRALSURFACETYPE, TINTYPE, and LWGEOM::type.

Referenced by lwgeom_dimensionality(), and LWGEOM_isclosed().

961 {
962  int type = geom->type;
964  if( lwgeom_is_empty(geom) )
965  return LW_FALSE;
967  /* Test linear types for closure */
968  switch (type)
969  {
970  case LINETYPE:
971  return lwline_is_closed((LWLINE*)geom);
972  case POLYGONTYPE:
973  return lwpoly_is_closed((LWPOLY*)geom);
975  return lwcircstring_is_closed((LWCIRCSTRING*)geom);
977  return lwcompound_is_closed((LWCOMPOUND*)geom);
978  case TINTYPE:
979  return lwtin_is_closed((LWTIN*)geom);
981  return lwpsurface_is_closed((LWPSURFACE*)geom);
982  }
984  /* Recurse into collections and see if anything is not closed */
985  if ( lwgeom_is_collection(geom) )
986  {
988  int i;
989  int closed;
990  for ( i = 0; i < col->ngeoms; i++ )
991  {
992  closed = lwgeom_is_closed(col->geoms[i]);
993  if ( ! closed )
994  return LW_FALSE;
995  }
996  return LW_TRUE;
997  }
999  /* All non-linear non-collection types we will call closed */
1000  return LW_TRUE;
1001 }
#define LINETYPE
Definition: liblwgeom.h:85
int lwtin_is_closed(const LWTIN *tin)
Definition: lwtin.c:93
Definition: liblwgeom.h:86
Definition: liblwgeom.h:92
Definition: liblwgeom.h:96
int lwcompound_is_closed(const LWCOMPOUND *curve)
Definition: lwcompound.c:35
int lwgeom_is_closed(const LWGEOM *geom)
Return true or false depending on whether a geometry is a linear feature that closes on itself...
Definition: lwgeom.c:960
#define LW_FALSE
Definition: liblwgeom.h:76
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
LWGEOM ** geoms
Definition: liblwgeom.h:508
int lwpoly_is_closed(const LWPOLY *poly)
Definition: lwpoly.c:547
int lwcircstring_is_closed(const LWCIRCSTRING *curve)
Definition: lwcircstring.c:268
#define TINTYPE
Definition: liblwgeom.h:98
int lwpsurface_is_closed(const LWPSURFACE *psurface)
Definition: lwpsurface.c:99
LWCOLLECTION * lwgeom_as_lwcollection(const LWGEOM *lwgeom)
Definition: lwgeom.c:156
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:1310
int lwgeom_is_collection(const LWGEOM *geom)
Determine whether a LWGEOM can contain sub-geometries or not.
Definition: lwgeom.c:1004
int lwline_is_closed(const LWLINE *line)
Definition: lwline.c:468
uint8_t type
Definition: liblwgeom.h:395
Definition: liblwgeom.h:91

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