PostGIS  2.2.7dev-r@@SVN_REVISION@@
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 472 of file lwgeom_api.c.

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

Referenced by geometry_to_path(), geometry_to_polygon(), 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_distance_spheroid(), lwline_crossing_direction(), lwpoint_from_wkb_state(), lwpoint_inside_circle(), lwpoint_to_latlon(), 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().

473 {
474  if ( ! pa ) return 0;
475 
476  if ( (n<0) || (n>=pa->npoints))
477  {
478  lwerror("getPoint2D_const_p: point offset out of range");
479  return 0; /*error */
480  }
481 
482  return (const POINT2D*)getPoint_internal(pa, n);
483 }
int npoints
Definition: liblwgeom.h:355
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:74

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