11#import <BaiduMapAPI_Base_Navi/BMKTypes.h> 
   13#import <BaiduMapAPI_Base/BMKTypes.h> 
   17@protocol BMKOverlay <BMKAnnotation>
 
   21@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
 
   24@property (nonatomic, readonly) 
BMKMapRect boundingMapRect;
 
矩形,用直角地理坐标表示
Definition BMKTypes.h:278