Problem with direction of points in sdo_ordinate_array

Question

i have created a polygon selection tool to create a polygon . I use sdo_relate function to get another point geometry from the polygon.
SELECT a.cust_id
FROM T_S_CUSTOMERS a
WHERE SDO_RELATE(a.geometry,SDO_GEOMETRY(2003, 8307, NULL,
SDO_ELEM_INFO_ARRAY(1,1003,1),
SDO_ORDINATE_ARRAY("+lstcoordinates+")),
'mask=anyinteract querytype=window') = 'TRUE';
I want to find cust_id from this polygon .If i draw the polygon in anti clock wise direction , the query works but if i draw the polygon in clockwise direction , the query fails .
Since the polygon will be drawn by user at the front end , I cannot restrict the direction in which user draws the polygon .User can also start drawing the polygon in clock wise direction then shift to anti clock wise direction to complete it. Is there any way
through which i can get the result irrespective of user direction sense .

Answer 1

The easiest way to ensure the polygon is counter-clockwise is to use this:
SDO_MIGRATE.TO_CURRENT(
geom IN SDO_GEOMETRY,
dim IN SDO_DIM_ARRAY
) RETURN SDO_GEOMETRY;
Example:
SELECT sdo_migrate.to_current (SDO_GEOMETRY (2003,
8307,
NULL,
sdo_elem_info_array (1, 1003, 1),
sdo_ordinate_array (1, 1, 1, 2, 2, 2, 2, 1, 1, 1)
sdo_dim_array (sdo_dim_element ('Longitude', -180, 180, .05),
sdo_dim_element ('Latitude', -90, 90, .05)
) ccgeom
FROM DUAL;
CCGEOM(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), SDO_ELEM_INFO, SDO_ORDINATES)
SDO_GEOMETRY(2003, 8307, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_ARRAY(1, 1, 2, 1, 2, 2, 1, 2, 1, 1))