geography_closestpoint()

Datum geography_closestpoint

(

PG_FUNCTION_ARGS

)

Definition at line 1407 of file geography_measurement.c.

{
        GSERIALIZED *g1 = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *g2 = PG_GETARG_GSERIALIZED_P(1);
        LWGEOM *point, *lwg1, *lwg2;
        GSERIALIZED *result;
 
        gserialized_error_if_srid_mismatch(g1, g2, __func__);
 
        lwg1 = lwgeom_from_gserialized(g1);
        lwg2 = lwgeom_from_gserialized(g2);
 
        /* Return NULL on empty/bad arguments. */
        if ( !lwg1 || !lwg2 || lwgeom_is_empty(lwg1) || lwgeom_is_empty(lwg2) )
        {
                PG_FREE_IF_COPY(g1, 0);
                PG_FREE_IF_COPY(g2, 1);
                PG_RETURN_NULL();
        }
 
        point = geography_tree_closestpoint(lwg1, lwg2, FP_TOLERANCE);
        result = geography_serialize(point);
        lwgeom_free(point);
        lwgeom_free(lwg1);
        lwgeom_free(lwg2);
 
        PG_FREE_IF_COPY(g1, 0);
        PG_FREE_IF_COPY(g2, 1);
        PG_RETURN_POINTER(result);
}

References FP_TOLERANCE, geography_tree_closestpoint(), gserialized_error_if_srid_mismatch(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_empty(), and result.

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