如何为GMSMarker创建边界

import GoogleMaps

// 创建GMSMapView对象
let mapView = GMSMapView(frame: CGRect.zero)

// 创建GMSMutablePath对象
let path = GMSMutablePath()

// 添加坐标点到GMSMutablePath对象
path.addLatitude(37.35, longitude: -122.0)
path.addLatitude(37.45, longitude: -122.0)
path.addLatitude(37.45, longitude: -122.2)
path.addLatitude(37.35, longitude: -122.2)

// 创建GMSPolygon对象，并设置路径属性
let polygon = GMSPolygon(path: path)

// 设置边界的样式
polygon.strokeColor = UIColor.red
polygon.fillColor = UIColor(red: 1.0, green: 0.0, blue: 0.0, alpha: 0.2)
polygon.strokeWidth = 2.0

// 将GMSPolygon对象添加到GMSMapView对象中
polygon.map = mapView