PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ getPoint2d_cp()

const POINT2D* getPoint2d_cp ( const POINTARRAY pa,
int  n 
)

Returns a POINT2D pointer into the POINTARRAY serialized_ptlist, suitable for reading from.

This is very high performance and declared const because you aren't allowed to muck with the values, only read them.

Returns a POINT2D pointer into the POINTARRAY serialized_ptlist, suitable for reading from.

This is very high performance and declared const because you aren't allowed to muck with the values, only read them.

Definition at line 485 of file lwgeom_api.c.

References getPoint_internal(), lwerror(), and POINTARRAY::npoints.

Referenced by dbscan_update_context(), geometry_to_path(), geometry_to_polygon(), geos_envelope_surrogate(), getPoint2d(), lw_curvering_getfirstpoint2d_cp(), lw_dist2d_fast_ptarray_ptarray(), lw_dist2d_line_curvepoly(), lw_dist2d_line_poly(), lw_dist2d_point_circstring(), lw_dist2d_point_curvepoly(), lw_dist2d_point_line(), lw_dist2d_point_point(), lw_dist2d_point_poly(), lw_dist2d_poly_poly(), lw_dist2d_pre_seg_seg(), lw_dist2d_pt_ptarray(), lw_dist2d_pt_ptarrayarc(), lw_dist2d_ptarray_ptarray(), lw_dist2d_ptarray_ptarrayarc(), lw_dist2d_ptarrayarc_ptarrayarc(), lwgeom_cluster_2d_kmeans(), lwgeom_distance_spheroid(), lwline_crossing_direction(), lwpoint_from_wkb_state(), lwpoint_inside_circle(), lwpoint_to_latlon(), point_in_ring(), point_in_ring_rtree(), pointArray_svg_rel(), pointarray_to_encoded_polyline(), pointArray_to_geojson(), pointArray_toGML2(), pointArray_toGML3(), pt_in_ring_2d(), ptarray_arc_length_2d(), ptarray_area_sphere(), ptarray_calculate_gbox_geodetic(), ptarray_contains_point_partial(), ptarray_distance_spheroid(), ptarray_dp_findsplit(), ptarray_length_2d(), ptarray_locate_point(), ptarray_npoints_in_rect(), ptarray_remove_repeated_points_minpoints(), ptarray_signed_area(), ptarray_to_GEOSCoordSeq(), and ptarrayarc_contains_point_partial().

486 {
487  if ( ! pa ) return 0;
488 
489  if ( (n<0) || (n>=pa->npoints))
490  {
491  lwerror("getPoint2D_const_p: point offset out of range");
492  return 0; /*error */
493  }
494 
495  return (const POINT2D*)getPoint_internal(pa, n);
496 }
int npoints
Definition: liblwgeom.h:370
uint8_t * getPoint_internal(const POINTARRAY *pa, int n)
Definition: ptarray.c:1706
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:102
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