iossdk

更新时间：2020-06-23

两点距离计算

根据用户指定的两个坐标点，计算这两个点的实际地理距离。核心代码如下:

Objective-C

Swift

//导入工具功能包BaiduMapAPI_Utils.framework
#import <BaiduMapAPI_Utils/BMKUtilsComponent.h>
BMKMapPoint point1 = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.915,116.404)); BMKMapPoint point2 = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(38.915,115.404)); CLLocationDistance distance = BMKMetersBetweenMapPoints(point1,point2);

//在桥接头文件BMKSwiftDemo-Bridging-Header中导入工具功能包
#import <BaiduMapAPI_Utils/BMKUtilsComponent.h>
let point1 = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.915,116.404))
let point2 = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(38.915,115.404))
let distance = BMKMetersBetweenMapPoints(point1,point2)

点与圆、多边形的位置关系

SDK支持判断点与圆或多边形的位置关系，判断点是否在圆内，或者是否在多边形内。

判断点与圆位置关系的示例代码如下：

Objective-C

Swift

//导入工具功能包BaiduMapAPI_Utils.framework
#import <BaiduMapAPI_Utils/BMKUtilsComponent.h>
BOOL ptInCircle = BMKCircleContainsCoordinate(CLLocationCoordinate2DMake(39.918,116.408), CLLocationCoordinate2DMake(39.915,116.404), 1000);

//在桥接头文件BMKSwiftDemo-Bridging-Header中导入工具功能包
#import <BaiduMapAPI_Utils/BMKUtilsComponent.h>
let ptInCircle = BMKCircleContainsCoordinate(CLLocationCoordinate2DMake(39.918,116.408), CLLocationCoordinate2DMake(39.915,116.404), 1000);

判断点与多边形位置关系的示例代码如下：

Objective-C

Swift

//导入工具功能包BaiduMapAPI_Utils.framework
#import <BaiduMapAPI_Utils/BMKUtilsComponent.h>
CLLocationCoordinate2D coords[5] = {0};
coords[0].latitude = 39.965;
coords[0].longitude = 116.604;
coords[1].latitude = 39.865;
coords[1].longitude = 116.604;
coords[2].latitude = 39.865;
coords[2].longitude = 116.704;
coords[3].latitude = 39.905;
coords[3].longitude = 116.654;
coords[4].latitude = 39.965;
coords[4].longitude = 116.704;
BOOL ptInPolygon = BMKPolygonContainsCoordinate(CLLocationCoordinate2DMake(39.918,116.408),coords, 5);

//在桥接头文件BMKSwiftDemo-Bridging-Header中导入工具功能包
#import <BaiduMapAPI_Utils/BMKUtilsComponent.h>
var coords = [CLLocationCoordinate2D]()
coords.append(CLLocationCoordinate2D(latitude: 39.965, longitude: 116.604))
coords.append(CLLocationCoordinate2D(latitude: 39.865, longitude: 116.604))
coords.append(CLLocationCoordinate2D(latitude: 39.865, longitude: 116.704))
coords.append(CLLocationCoordinate2D(latitude: 39.905, longitude: 116.654))
coords.append(CLLocationCoordinate2D(latitude: 39.965, longitude: 116.704))

let ptInPolygon = BMKPolygonContainsCoordinate(CLLocationCoordinate2DMake(39.918,116.408),&coords, 5)

点与折线的位置关系

SDK还提供获取折线上与折线外指定位置最近点的方法。核心代码如下：

Objective-C

Swift

//导入工具功能包BaiduMapAPI_Utils.framework
#import <BaiduMapAPI_Utils/BMKUtilsComponent.h>
BMKMapPoint *polylinePoints = new BMKMapPoint[4];
polylinePoints[0]= BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.915,116.404));
polylinePoints[1]= BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.915,116.454));;
polylinePoints[2]= BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.975,116.524));;
polylinePoints[3]= BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.855,116.554));
BMKMapPoint point = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.815,116.504));
BMKMapPoint nearestPoint = BMKGetNearestMapPointFromPolyline(point, polylinePoints, 4);

//在桥接头文件BMKSwiftDemo-Bridging-Header中导入工具功能包
#import <BaiduMapAPI_Utils/BMKUtilsComponent.h>
var polylinePoints = [BMKMapPoint]()
polylinePoints.append(BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.915, 116.404)))
polylinePoints.append(BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.915, 116.454)))
polylinePoints.append(BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.975, 116.524)))
polylinePoints.append(BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.855, 116.554)))

let point = BMKMapPointForCoordinate(CLLocationCoordinate2DMake(39.815, 116.504));
let nearestPoint = BMKGetNearestMapPointFromPolyline(point, &polylinePoints, 4)

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