/// <summary>
/// Returns a signed angle
/// </summary>
/// <param name="direction"></param>
/// <param name="next"></param>
/// <returns></returns>
public static Angle GetSignedAngleBetween(LineSegment2 direction, Vector2 next)
{
var angle = next.GetAngleTo(direction.ToVector());
return(angle * (direction.IsLeft(next) ? 1 : -1));
}