如何获取路径中特定距离的坐标

Question

我正在使用谷歌地图ios sdk，我的问题是我必须在地图中的多边形线上获得每1000米的坐标。现在我能够获得给定路径中的位置数，并能够使用以下代码片段访问它们。

-(NSMutableArray*)getCoordinates {

    pathCoordinatesArray = [[NSMutableArray alloc]init];
  GMSMutablePath *path = [VTDirectionManager getPath];
    NSLog(@"count %d",path.count);

    for (int i=0 ; i<path.count; i++) {

        if (i+1 > path.count) {
            return pathCoordinatesArray;
        }
        for (int j = i+1; j<path.count; j++) {

            CLLocationCoordinate2D sourceCoordinate = [path coordinateAtIndex:i];
            CLLocation *sourceLocation = [[CLLocation alloc]initWithLatitude:sourceCoordinate.latitude longitude:sourceCoordinate.longitude];

            CLLocationCoordinate2D destinationCoordinate = [path coordinateAtIndex:j];
                        CLLocation *destinationLocation = [[CLLocation alloc]initWithLatitude:destinationCoordinate.latitude longitude:destinationCoordinate.longitude];

            BOOL check ;

          check = [self checkDistanceForSource:sourceLocation andDestination:destinationLocation];

            //jump to next 1000 distance position

            if (check) {
                i = j;
            }
        }




    }


    return pathCoordinatesArray;



}

-(BOOL)checkDistanceForSource:(CLLocation*)source andDestination:(CLLocation*)destination {

    CLLocationDistance distance = [source distanceFromLocation:destination];

    if (distance > 1000) {

        CLLocation *location = [[CLLocation alloc] initWithLatitude:destination.coordinate.latitude longitude:destination.coordinate.longitude];

        [pathCoordinatesArray addObject:location];
        return YES;
    }
    return  NO;

}

假如我有5000米距离路径，那么我必须得到5个坐标，每个坐标位于1000米位置。

我认为这是错误的代码。建议我使用优化代码

查看图像，每个点都是1000米的距离。

Answer 1

请更改您的循环代码

for (int i=0 ; i<path.count; i++) {

    if (pathCoordinatesArray.count == 0) {
        CLLocationCoordinate2D temp2d = [path coordinateAtIndex:i];
        CLLocation *tempLoc = [[CLLocation alloc]initWithLatitude:temp2d.latitude longitude:temp2d.longitude];

        [pathCoordinatesArray addObject:tempLoc];
    }
    CLLocationCoordinate2D destinationCoordinate = [path coordinateAtIndex:i];
    CLLocation *destinationLocation = [[CLLocation alloc]initWithLatitude:destinationCoordinate.latitude longitude:destinationCoordinate.longitude];

    [self checkDistanceForSource:[pathCoordinatesArray lastObject] andDestination:destinationLocation];
    }
}