google map 根据一组数据坐标设置地图中心位置和缩放率

／／根据一组数据坐标设置地图中心位置和缩放率

func zoomToMapPoints(_annotations:[CLLocationCoordinate2D]) {

varmaxLat:CLLocationDegrees=-90

varmaxLon:CLLocationDegrees=-180

varminLat:CLLocationDegrees=90

varminLon:CLLocationDegrees=180

foritem:CLLocationCoordinate2Dinannotations {

ifitem.latitude< minLat {

minLat = item.latitude

}

ifitem.latitude> maxLat {

maxLat = item.latitude

}

ifitem.longitude< minLon {

minLon = item.longitude

}

ifitem.latitude> maxLon {

maxLon = item.longitude

}

}

//设置中心的位置坐标

letcenLng:CLLocationDegrees= (maxLon+minLon)/2;

letcenLat:CLLocationDegrees= (maxLat+minLat)/2;

letzoom =getZoom(maxLng: maxLon, maxLat: maxLat, minLng: minLon, minLat: minLat)

letcamera =GMSCameraPosition.camera(withLatitude:cenLat,

longitude:cenLng, zoom:Float(zoom))

self.setCenter(camera:camera)

}

//根据经纬极值计算绽放级别

func getZoom (maxLng:CLLocationDegrees, maxLat:CLLocationDegrees,minLng:CLLocationDegrees, minLat:CLLocationDegrees) ->Int{

letzooms:[Double] = [50.0,100.0,200.0,500.0,1000.0,2000.0,5000.0,10000.0,20000.0,25000.0,50000.0,100000.0,200000.0,500000.0,1000000.0,2000000.0]//级别18到3。

letlocation1 =CLLocation(latitude:maxLat, longitude:maxLng)

letlocation2 =CLLocation(latitude:minLat, longitude:minLng)

letdistance:Double= location1.distance(from:location2)

vari:Int=0

forzoom:Doubleinzooms {

ifzoom - distance >0{

return18- i +3

}

i +=1

}

return18

}