geography_covers()

Datum geography_covers

(

PG_FUNCTION_ARGS

)

Definition at line 733 of file geography_measurement.c.

{
        LWGEOM *lwgeom1 = NULL;
        LWGEOM *lwgeom2 = NULL;
        GSERIALIZED *g1 = NULL;
        GSERIALIZED *g2 = NULL;
        int result = LW_FALSE;
 
        /* Get our geometry objects loaded into memory. */
        g1 = PG_GETARG_GSERIALIZED_P(0);
        g2 = PG_GETARG_GSERIALIZED_P(1);
 
        /* Construct our working geometries */
        lwgeom1 = lwgeom_from_gserialized(g1);
        lwgeom2 = lwgeom_from_gserialized(g2);
 
        error_if_srid_mismatch(lwgeom1->srid, lwgeom2->srid);
 
        /* EMPTY never intersects with another geometry */
        if ( lwgeom_is_empty(lwgeom1) || lwgeom_is_empty(lwgeom2) )
        {
                lwgeom_free(lwgeom1);
                lwgeom_free(lwgeom2);
                PG_FREE_IF_COPY(g1, 0);
                PG_FREE_IF_COPY(g2, 1);
                PG_RETURN_BOOL(false);
        }
 
        /* Calculate answer */
        result = lwgeom_covers_lwgeom_sphere(lwgeom1, lwgeom2);
 
        /* Clean up */
        lwgeom_free(lwgeom1);
        lwgeom_free(lwgeom2);
        PG_FREE_IF_COPY(g1, 0);
        PG_FREE_IF_COPY(g2, 1);
 
        PG_RETURN_BOOL(result);
}

References error_if_srid_mismatch(), LW_FALSE, lwgeom_covers_lwgeom_sphere(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_empty(), and LWGEOM::srid.

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