private Vector2 GetRotationVector (Vector2 target, Vector2 axis)
{
var tRad = Atan2(target.y, target.x);
var aRad = Atan2(axis.y, axis.x);
var rad = tRad+aRad;
return new Vector2(Cos(rad), Sin(rad))*target.GetDistance();
}
它可以更容易吗?