geography_point_outside()

Datum geography_point_outside

(

PG_FUNCTION_ARGS

)

Definition at line 677 of file geography_measurement.c.

{
        GBOX gbox;
        LWGEOM *lwpoint = NULL;
        POINT2D pt;
 
        /* We need the bounding box to get an outside point for area algorithm */
        if (gserialized_datum_get_gbox_p(PG_GETARG_DATUM(0), &gbox) == LW_FAILURE)
        {
                POSTGIS_DEBUG(4, "gserialized_datum_get_gbox_p returned LW_FAILURE");
                elog(ERROR, "Error in gserialized_datum_get_gbox_p calculation.");
                PG_RETURN_NULL();
        }
        POSTGIS_DEBUGF(4, "got gbox %s", gbox_to_string(&gbox));
 
        /* Get an exterior point, based on this gbox */
        gbox_pt_outside(&gbox, &pt);
 
        lwpoint = (LWGEOM*) lwpoint_make2d(4326, pt.x, pt.y);
 
        PG_RETURN_POINTER(geography_serialize(lwpoint));
}

References gbox_pt_outside(), gbox_to_string(), gserialized_datum_get_gbox_p(), LW_FAILURE, lwpoint_make2d(), POINT2D::x, and POINT2D::y.

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