将 CLLocation 移动 x 米 [英] Moving a CLLocation by x meters

问题描述

我定义了一个 CLLocation，我想将该点向东移动 x 米，向南移动 y 米.我怎样才能做到这一点?

I have a CLLocation defined, and I'd like to move that point x meters to the east and y meters to the south. How may I achieve that?

推荐答案

有一个 C 函数与您所要求的很接近，但它需要一个方位和距离.它位于 github 上的 UtilitiesGeo 类中.您可以将 CLLocation 的纬度和经度传递给它，然后根据它返回的结果 lat2 和 lon2 创建一个新的 CLLocation:

There is a C function that is close to what you are asking but it takes a bearing and distance. It's in my UtilitiesGeo class on github. You would pass the latitude and longitude from your CLLocation to it and then create a new CLLocation from the resulting lat2 and lon2 that it returns:

/*-------------------------------------------------------------------------
* Given a starting lat/lon point on earth, distance (in meters)
* and bearing, calculates destination coordinates lat2/lon2.
*
* all params in degrees
*-------------------------------------------------------------------------*/
void destCoordsInDegrees(double lat1, double lon1,
                         double distanceMeters, double bearing,
                         double* lat2, double* lon2);

如果你不能使用它，看看它派生自这里的算法 和 这里 也许你可以修改它或那些网站可能有更接近您需求的东西.

If you can't use that, take a look at the algorithms that it was derived from here and here and perhaps you can modify it or those sites might have something closer to your needs.

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