PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ lwgeom_nudge_geodetic()

int lwgeom_nudge_geodetic ( LWGEOM geom)

Gently move coordinates of LWGEOM if they are close enough into geodetic range.

Gently move coordinates of LWGEOM if they are close enough into geodetic range.

This routine nudges those points, and only those points, back over to the bounds. http://trac.osgeo.org/postgis/ticket/1292

Definition at line 3404 of file lwgeodetic.c.

3405 {
3406  int type;
3407  uint32_t i = 0;
3408  int rv = LW_FALSE;
3409 
3410  assert(geom);
3411 
3412  /* No points in nothing */
3413  if ( lwgeom_is_empty(geom) )
3414  return LW_FALSE;
3415 
3416  type = geom->type;
3417 
3418  if ( type == POINTTYPE )
3419  return ptarray_nudge_geodetic(((LWPOINT*)geom)->point);
3420 
3421  if ( type == LINETYPE )
3422  return ptarray_nudge_geodetic(((LWLINE*)geom)->points);
3423 
3424  if ( type == POLYGONTYPE )
3425  {
3426  LWPOLY *poly = (LWPOLY*)geom;
3427  for ( i = 0; i < poly->nrings; i++ )
3428  {
3429  int n = ptarray_nudge_geodetic(poly->rings[i]);
3430  rv = (rv == LW_TRUE ? rv : n);
3431  }
3432  return rv;
3433  }
3434 
3435  if ( type == TRIANGLETYPE )
3436  return ptarray_nudge_geodetic(((LWTRIANGLE*)geom)->points);
3437 
3438  if ( lwtype_is_collection( type ) )
3439  {
3440  LWCOLLECTION *col = (LWCOLLECTION*)geom;
3441 
3442  for ( i = 0; i < col->ngeoms; i++ )
3443  {
3444  int n = lwgeom_nudge_geodetic(col->geoms[i]);
3445  rv = (rv == LW_TRUE ? rv : n);
3446  }
3447  return rv;
3448  }
3449 
3450  lwerror("unsupported type (%s) passed to lwgeom_nudge_geodetic", lwtype_name(type));
3451  return rv;
3452 }
#define LW_FALSE
Definition: liblwgeom.h:77
#define LINETYPE
Definition: liblwgeom.h:86
int lwtype_is_collection(uint8_t type)
Determine whether a type number is a collection or not.
Definition: lwgeom.c:1093
#define POINTTYPE
LWTYPE numbers, used internally by PostGIS.
Definition: liblwgeom.h:85
#define POLYGONTYPE
Definition: liblwgeom.h:87
const char * lwtype_name(uint8_t type)
Return the type name string associated with a type number (e.g.
Definition: lwutil.c:218
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:1393
#define TRIANGLETYPE
Definition: liblwgeom.h:98
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:76
int lwgeom_nudge_geodetic(LWGEOM *geom)
When features are snapped or sometimes they are just this way, they are very close to the geodetic bo...
Definition: lwgeodetic.c:3404
static int ptarray_nudge_geodetic(POINTARRAY *pa)
When features are snapped or sometimes they are just this way, they are very close to the geodetic bo...
Definition: lwgeodetic.c:3352
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190
type
Definition: ovdump.py:41
uint32_t ngeoms
Definition: liblwgeom.h:510
LWGEOM ** geoms
Definition: liblwgeom.h:512
uint8_t type
Definition: liblwgeom.h:399
POINTARRAY ** rings
Definition: liblwgeom.h:460
uint32_t nrings
Definition: liblwgeom.h:458
unsigned int uint32_t
Definition: uthash.h:78

References LWCOLLECTION::geoms, LINETYPE, LW_FALSE, LW_TRUE, lwerror(), lwgeom_is_empty(), lwgeom_nudge_geodetic(), lwtype_is_collection(), lwtype_name(), LWCOLLECTION::ngeoms, LWPOLY::nrings, POINTTYPE, POLYGONTYPE, ptarray_nudge_geodetic(), LWPOLY::rings, TRIANGLETYPE, LWGEOM::type, and ovdump::type.

Referenced by geography_from_geometry(), gserialized_geography_from_lwgeom(), and lwgeom_nudge_geodetic().

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