PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ getPoint_internal()

uint8_t* getPoint_internal ( const POINTARRAY pa,
int  n 
)

Definition at line 1713 of file ptarray.c.

References POINTARRAY::flags, FLAGS_NDIMS, LWDEBUGF, lwerror(), POINTARRAY::maxpoints, POINTARRAY::npoints, ptarray_point_size(), and POINTARRAY::serialized_pointlist.

Referenced by circ_node_leaf_new(), circ_node_leaf_point_new(), getPoint2d_cp(), getPoint2d_p(), getPoint2d_p_ro(), getPoint3dm_p(), getPoint3dz_cp(), getPoint3dz_p(), getPoint4d_cp(), getPoint4d_p(), gserialized_from_lwcircstring(), gserialized_from_lwline(), gserialized_from_lwpoint(), gserialized_from_lwpoly(), gserialized_from_lwtriangle(), lwcircstring_addpoint(), lwcircstring_from_lwmpoint(), lwcircstring_from_lwpointarray(), lwcompound_is_closed(), LWGEOM2GEOS(), lwline_make_geos_friendly(), parse_gml_curve(), ptarray_addPoint(), ptarray_append_ptarray(), ptarray_calc_areas(), ptarray_close2d(), ptarray_insert_point(), ptarray_is_closed(), ptarray_is_closed_2d(), ptarray_is_closed_3d(), ptarray_longitude_shift(), ptarray_merge(), ptarray_remove_point(), ptarray_remove_repeated_points_minpoints(), ptarray_removePoint(), ptarray_reverse(), ptarray_same(), ptarray_set_point4d(), ptarray_to_GEOSLinearRing(), ptarray_to_twkb_buf(), ptarray_to_wkb_buf(), ptarray_to_wkt_sb(), rect_node_leaf_new(), ring_make_geos_friendly(), and tune_areas().

1714 {
1715  size_t size;
1716  uint8_t *ptr;
1717 
1718 #if PARANOIA_LEVEL > 0
1719  if ( pa == NULL )
1720  {
1721  lwerror("getPoint got NULL pointarray");
1722  return NULL;
1723  }
1724 
1725  LWDEBUGF(5, "(n=%d, pa.npoints=%d, pa.maxpoints=%d)",n,pa->npoints,pa->maxpoints);
1726 
1727  if ( ( n < 0 ) ||
1728  ( n > pa->npoints ) ||
1729  ( n >= pa->maxpoints ) )
1730  {
1731  lwerror("getPoint_internal called outside of ptarray range (n=%d, pa.npoints=%d, pa.maxpoints=%d)",n,pa->npoints,pa->maxpoints);
1732  return NULL; /*error */
1733  }
1734 #endif
1735 
1736  size = ptarray_point_size(pa);
1737 
1738  ptr = pa->serialized_pointlist + size * n;
1739  if ( FLAGS_NDIMS(pa->flags) == 2)
1740  {
1741  LWDEBUGF(5, "point = %g %g", *((double*)(ptr)), *((double*)(ptr+8)));
1742  }
1743  else if ( FLAGS_NDIMS(pa->flags) == 3)
1744  {
1745  LWDEBUGF(5, "point = %g %g %g", *((double*)(ptr)), *((double*)(ptr+8)), *((double*)(ptr+16)));
1746  }
1747  else if ( FLAGS_NDIMS(pa->flags) == 4)
1748  {
1749  LWDEBUGF(5, "point = %g %g %g %g", *((double*)(ptr)), *((double*)(ptr+8)), *((double*)(ptr+16)), *((double*)(ptr+24)));
1750  }
1751 
1752  return ptr;
1753 }
uint8_t * serialized_pointlist
Definition: liblwgeom.h:365
int ptarray_point_size(const POINTARRAY *pa)
Definition: ptarray.c:54
int npoints
Definition: liblwgeom.h:370
uint8_t flags
Definition: liblwgeom.h:368
int maxpoints
Definition: liblwgeom.h:371
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
#define FLAGS_NDIMS(flags)
Definition: liblwgeom.h:151
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:102
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