public double SquareDistanceTo(ObjectInWorld _object)
 {
     return SquareDistanceTo(_object.PosX, _object.PosX);
 }
 public double DistanceTo(ObjectInWorld _object)
 {
     return Math.Sqrt((_object.PosX - PosX) * (_object.PosX - PosX) + (_object.PosY - PosY) * (_object.PosY - PosY));
     //return Math.Sqrt( SquareDistanceTo(_object) );
 }