func PrepareRelation(rel *element.Relation, srid int) (*preparedRelation, error) {
rings, err := BuildRings(rel)
if err != nil {
return nil, err
}
rel.Tags = relationTags(rel.Tags, rings[0].ways[0].Tags)
return &preparedRelation{rings, rel, srid}, nil
}
func BuildRelation(rel *element.Relation, srid int) error {
rings, err := BuildRings(rel)
if err != nil {
return err
}
rel.Tags = relationTags(rel.Tags, rings[0].ways[0].Tags)
_, err = BuildRelGeometry(rel, rings, srid)
if err != nil {
return err
}
return nil
}
