rectanglePolygon
fun FeatureGroup<XY>.rectanglePolygon(left: Number, right: Number, bottom: Number, top: Number, attributes: Attributes = Attributes.EMPTY, id: String? = null): FeatureRef<XY, PolygonFeature<XY>>
fun FeatureGroup<XY>.rectanglePolygon(rectangle: Rectangle<XY>, attributes: Attributes = Attributes.EMPTY, id: String? = null): FeatureRef<XY, PolygonFeature<XY>>