lwline_get_lwpoint()

LWPOINT * lwline_get_lwpoint ( const LWLINE *  line, uint32_t  where  )

extern

Returns freshly allocated LWPOINT that corresponds to the index where.

Returns NULL if the geometry is empty or the index invalid.

Definition at line 309 of file lwline.c.

{
        POINT4D pt;
        LWPOINT *lwpoint;
        POINTARRAY *pa;
 
        if ( lwline_is_empty(line) || where >= line->points->npoints )
                return NULL;
 
        pa = ptarray_construct_empty(FLAGS_GET_Z(line->flags), FLAGS_GET_M(line->flags), 1);
        pt = getPoint4d(line->points, where);
        ptarray_append_point(pa, &pt, LW_TRUE);
        lwpoint = lwpoint_construct(line->srid, NULL, pa);
        return lwpoint;
}

References LWLINE::flags, FLAGS_GET_M, FLAGS_GET_Z, getPoint4d(), LW_TRUE, lwline_is_empty(), lwpoint_construct(), POINTARRAY::npoints, LWLINE::points, ptarray_append_point(), ptarray_construct_empty(), and LWLINE::srid.

Referenced by _lwt_AddLine(), _lwt_AddLineEdge(), gserialized_distance_nd(), lwcompound_get_endpoint(), lwcompound_get_lwpoint(), lwgeom_collect_endpoints(), LWGEOM_dumppoints(), LWGEOM_endpoint_linestring(), LWGEOM_pointn_linestring(), LWGEOM_startpoint_linestring(), and lwline_covers_lwline().

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