PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ lwgeom_offsetcurve()

LWGEOM* lwgeom_offsetcurve ( const LWGEOM geom,
double  size,
int  quadsegs,
int  joinStyle,
double  mitreLimit 
)

Definition at line 1572 of file liblwgeom/lwgeom_geos.c.

1573 {
1574  int32_t srid = RESULT_SRID(geom);
1575  LWGEOM *result = NULL;
1576  LWGEOM *noded = NULL;
1577  if (srid == SRID_INVALID) return NULL;
1578 
1579  if (lwgeom_dimension(geom) != 1)
1580  {
1581  lwerror("%s: input is not linear", __func__, lwtype_name(geom->type));
1582  return NULL;
1583  }
1584 
1585  while (!result)
1586  {
1587  switch (geom->type)
1588  {
1589  case LINETYPE:
1590  result = lwline_offsetcurve(lwgeom_as_lwline(geom), size, quadsegs, joinStyle, mitreLimit);
1591  break;
1592  case COLLECTIONTYPE:
1593  case MULTILINETYPE:
1594  result = lwcollection_offsetcurve(lwgeom_as_lwcollection(geom), size, quadsegs, joinStyle, mitreLimit);
1595  break;
1596  default:
1597  lwerror("%s: unsupported geometry type: %s", __func__, lwtype_name(geom->type));
1598  return NULL;
1599  }
1600 
1601  if (result)
1602  {
1603  if (noded) lwgeom_free(noded);
1604  return result;
1605  }
1606  else if (!noded)
1607  {
1608  noded = lwgeom_node(geom);
1609  if (!noded)
1610  {
1611  lwerror("lwgeom_offsetcurve: cannot node input");
1612  return NULL;
1613  }
1614  geom = noded;
1615  }
1616  else
1617  {
1618  lwgeom_free(noded);
1619  lwerror("lwgeom_offsetcurve: noded geometry cannot be offset");
1620  return NULL;
1621  }
1622  }
1623 
1624  return result;
1625 }
char result[OUT_DOUBLE_BUFFER_SIZE]
Definition: cu_print.c:267
static LWGEOM * lwcollection_offsetcurve(const LWCOLLECTION *col, double size, int quadsegs, int joinStyle, double mitreLimit)
static LWGEOM * lwline_offsetcurve(const LWLINE *lwline, double size, int quadsegs, int joinStyle, double mitreLimit)
#define RESULT_SRID(...)
LWLINE * lwgeom_as_lwline(const LWGEOM *lwgeom)
Definition: lwgeom.c:162
#define COLLECTIONTYPE
Definition: liblwgeom.h:122
LWGEOM * lwgeom_node(const LWGEOM *lwgeom_in)
#define SRID_INVALID
Definition: liblwgeom.h:233
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1138
#define MULTILINETYPE
Definition: liblwgeom.h:120
#define LINETYPE
Definition: liblwgeom.h:117
int lwgeom_dimension(const LWGEOM *geom)
For an LWGEOM, returns 0 for points, 1 for lines, 2 for polygons, 3 for volume, and the max dimension...
Definition: lwgeom.c:1281
const char * lwtype_name(uint8_t type)
Return the type name string associated with a type number (e.g.
Definition: lwutil.c:216
LWCOLLECTION * lwgeom_as_lwcollection(const LWGEOM *lwgeom)
Definition: lwgeom.c:216
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190
uint8_t type
Definition: liblwgeom.h:476

References COLLECTIONTYPE, LINETYPE, lwcollection_offsetcurve(), lwerror(), lwgeom_as_lwcollection(), lwgeom_as_lwline(), lwgeom_dimension(), lwgeom_free(), lwgeom_node(), lwline_offsetcurve(), lwtype_name(), MULTILINETYPE, result, RESULT_SRID, SRID_INVALID, and LWGEOM::type.

Referenced by lwcollection_offsetcurve(), lwgeom_clip_to_ordinate_range(), ST_OffsetCurve(), test_geos_offsetcurve(), and test_geos_offsetcurve_crash().

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