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

问题描述

我有一个CLLocation定义，我想移动这一点x米到东，y米到南。如何实现这一点？

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函数接近你要求，距离。它在我的UtilitiesGeo类中的 github 。你将把纬度和经度从你的CLLocation传递给它，然后从它返回的结果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，请看看它从此处和这里，也许您可​​以修改它，或者这些网站可能有更接近您的需要。

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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