getPoint4d_p()

int getPoint4d_p ( const POINTARRAY *  pa, uint32_t  n, POINT4D *  point  )

extern

Definition at line 125 of file lwgeom_api.c.

{
        uint8_t *ptr;
        int zmflag;
 
        if ( ! pa )
        {
                lwerror("%s [%d] NULL POINTARRAY input", __FILE__, __LINE__);
                return 0;
        }
 
        if ( n>=pa->npoints )
        {
                lwerror("%s [%d] called with n=%d and npoints=%d", __FILE__, __LINE__, n, pa->npoints);
                return 0;
        }
 
        LWDEBUG(4, "getPoint4d_p called.");
 
        /* Get a pointer to nth point offset and zmflag */
        ptr=getPoint_internal(pa, n);
        zmflag=FLAGS_GET_ZM(pa->flags);
 
        LWDEBUGF(4, "ptr %p, zmflag %d", ptr, zmflag);
 
        switch (zmflag)
        {
        case 0: /* 2d  */
                memcpy(op, ptr, sizeof(POINT2D));
                op->m=NO_M_VALUE;
                op->z=NO_Z_VALUE;
                break;
 
        case 3: /* ZM */
                memcpy(op, ptr, sizeof(POINT4D));
                break;
 
        case 2: /* Z */
                memcpy(op, ptr, sizeof(POINT3DZ));
                op->m=NO_M_VALUE;
                break;
 
        case 1: /* M */
                memcpy(op, ptr, sizeof(POINT3DM));
                op->m=op->z; /* we use Z as temporary storage */
                op->z=NO_Z_VALUE;
                break;
 
        default:
                lwerror("Unknown ZM flag ??");
                return 0;
        }
        return 1;
 
}

References POINTARRAY::flags, FLAGS_GET_ZM, getPoint_internal(), LWDEBUG, LWDEBUGF, lwerror(), POINT4D::m, NO_M_VALUE, NO_Z_VALUE, POINTARRAY::npoints, and POINT4D::z.

Referenced by _lwt_AddLine(), _lwt_AddLineEdge(), _lwt_SplitAllEdgesToNewNode(), analyze_pa(), circstring_from_pa(), encode_coords(), encode_mpoint(), geography_interpolate_points(), geography_substring(), getPoint4d(), linestring_from_pa(), lwarc_linearize(), lwcircstring_calculate_gbox_cartesian(), lwcircstring_from_lwpointarray(), lwcircstring_linearize(), lwcompound_add_lwgeom(), lwcompound_linearize(), lwgeom_boundary(), LWGEOM_dumppoints(), LWGEOM_dumpsegments(), LWGEOM_setpoint_linestring(), LWGEOM_snaptogrid_pointoff(), lwgeom_wrapx(), lwline_add_lwpoint(), lwline_clip_to_ordinate_range(), lwline_extend(), lwline_from_lwmpoint(), lwline_interpolate_point_3d(), lwline_interpolate_points(), lwline_split_by_point_to(), lwmpoint_construct(), lwmpoint_extract_points_4d(), lwpoint_get_m(), lwpoint_get_x(), lwpoint_get_y(), lwpoint_get_z(), lwpoint_getPoint4d_p(), lwpointiterator_peek(), lwpoly_from_twkb_state(), lwpoly_pt_outside_hack(), lwpsurface_is_closed(), lwtin_is_closed(), lwtriangle_clip_to_ordinate_range(), parse_kml_polygon(), printPA(), pta_unstroke(), ptarray_append_point(), ptarray_clamp_to_ordinate_range(), ptarray_collect_mvals(), ptarray_flip_coordinates(), ptarray_force_dims(), ptarray_force_geodetic(), ptarray_length_spheroid(), ptarray_locate_along(), ptarray_locate_along_linear(), ptarray_locate_point(), ptarray_locate_point_spheroid(), ptarray_nudge_geodetic(), ptarray_remove_dim_helper(), ptarray_scale(), ptarray_segmentize2d(), ptarray_segmentize_sphere(), ptarray_startpoint(), ptarray_substring(), ptarray_swap_ordinates(), ptarray_to_kml2_sb(), ptarray_to_SFCGAL(), ptarray_to_x3d3_sb(), ptarray_transform(), removePoints(), test_raster_convex_hull(), and test_raster_envelope_geom().

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