lwgeom_needs_bbox()

int lwgeom_needs_bbox

(

const LWGEOM *

geom

)

Check whether or not a lwgeom is big enough to warrant a bounding box.

Check whether or not a lwgeom is big enough to warrant a bounding box when stored in the serialized form on disk. Currently only points are considered small enough to not require a bounding box, because the index operations can generate a large number of box-retrieval operations when scanning keys.

Definition at line 1271 of file lwgeom.c.

{
        assert(geom);
        if ( geom->type == POINTTYPE )
        {
                return LW_FALSE;
        }
        else if ( geom->type == LINETYPE )
        {
                if ( lwgeom_count_vertices(geom) <= 2 )
                        return LW_FALSE;
                else
                        return LW_TRUE;
        }
        else if ( geom->type == MULTIPOINTTYPE )
        {
                if ( ((LWCOLLECTION*)geom)->ngeoms == 1 )
                        return LW_FALSE;
                else
                        return LW_TRUE;
        }
        else if ( geom->type == MULTILINETYPE )
        {
                if ( ((LWCOLLECTION*)geom)->ngeoms == 1 && lwgeom_count_vertices(geom) <= 2 )
                        return LW_FALSE;
                else
                        return LW_TRUE;
        }
        else
        {
                return LW_TRUE;
        }
}

References LINETYPE, LW_FALSE, LW_TRUE, lwgeom_count_vertices(), MULTILINETYPE, MULTIPOINTTYPE, POINTTYPE, and LWGEOM::type.

Referenced by GEOS2POSTGIS(), gserialized1_from_lwgeom(), gserialized2_from_lwgeom(), lwgeom_from_gserialized1(), lwgeom_from_gserialized2(), LWGEOM_in(), LWGEOM_recv(), LWGEOMFromEWKB(), and LWGEOMFromTWKB().

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