/// <summary>
/// M
/// </summary>
/// <param name="coordinateInfo1"></param>
/// <param name="coordinateInfo2"></param>
/// <returns></returns>
protected static double Distance(CoordinateInfo coordinateInfo1, CoordinateInfo coordinateInfo2)
{
var d = CoordinatePositioningHelper.GetDistance(coordinateInfo1,
coordinateInfo2);
return d * 1000;
}
/// <summary>
/// 已知A点 和距离差，求 B点经度
/// </summary>
/// <param name="coordinate1">经纬度 A</param>
/// <param name="km">距离</param>
/// <returns></returns>
public static CoordinateInfo GetLngDistance(CoordinateInfo coordinate1, double km)
{
if (coordinate1 == null)
{
return null;
}
//纬度90度
if (coordinate1.Latitude > 90 || coordinate1.Latitude < 90)
{
var lng2 = coordinate1.Longitude * 100000 - km * 1000 / Math.Cos(coordinate1.Latitude);
return new CoordinateInfo(lng2 / 100000, coordinate1.Latitude);
}
return new CoordinateInfo(0, coordinate1.Latitude);
}
/// <summary>
/// 获取两点间距离 KM
/// </summary>
/// <param name="coordinate1"></param>
/// <param name="coordinate2"></param>
/// <returns></returns>
public static double GetDistance(CoordinateInfo coordinate1, CoordinateInfo coordinate2)
{
if (coordinate1 == null || coordinate2 == null)
{
return 0;
}
return GetDistance(coordinate1.Longitude, coordinate1.Latitude, coordinate2.Longitude, coordinate2.Latitude);
}